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From 03f539c766780a083010636cc67f96fcb2bab30f Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Fri, 24 Jun 2016 12:16:24 +0200
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Subject: [PATCH 76/84] lsns: backport new command
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Addresses: http://bugzilla.redhat.com/show_bug.cgi?id=1332084
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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 bash-completion/lsns    |  55 ++++
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 configure.ac            |   6 +
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 include/Makemodule.am   |   1 +
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 include/c.h             |   8 +
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 include/debug.h         |   2 +-
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 include/idcache.h       |  28 ++
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 include/procutils.h     |   2 +
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 lib/Makemodule.am       |   1 +
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 lib/idcache.c           | 117 ++++++++
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 lib/procutils.c         |  43 +++
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 sys-utils/Makemodule.am |   7 +
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 sys-utils/lsns.8        |  78 +++++
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 sys-utils/lsns.c        | 748 ++++++++++++++++++++++++++++++++++++++++++++++++
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 13 files changed, 1095 insertions(+), 1 deletion(-)
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 create mode 100644 bash-completion/lsns
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 create mode 100644 include/idcache.h
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 create mode 100644 lib/idcache.c
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 create mode 100644 sys-utils/lsns.8
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 create mode 100644 sys-utils/lsns.c
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diff --git a/bash-completion/lsns b/bash-completion/lsns
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new file mode 100644
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index 0000000..d02df3b
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--- /dev/null
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+++ b/bash-completion/lsns
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@@ -0,0 +1,55 @@
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+_lsns_module()
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+{
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+	local cur prev OPTS LSNS_COLS_ALL
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+	COMPREPLY=()
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+	cur="${COMP_WORDS[COMP_CWORD]}"
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+	prev="${COMP_WORDS[COMP_CWORD-1]}"
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+	LSNS_COLS_ALL="
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+		NS TYPE PATH NPROCS PID PPID COMMAND UID USER
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+	"
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+	case $prev in
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+		'-o'|'--output')
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+			local prefix realcur LSNS_COLS
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+			realcur="${cur##*,}"
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+			prefix="${cur%$realcur}"
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+			for WORD in $LSNS_COLS_ALL; do
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+				if ! [[ $prefix == *"$WORD"* ]]; then
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+					LSNS_COLS="$WORD $LSNS_COLS"
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+				fi
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+			done
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+			compopt -o nospace
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+			COMPREPLY=( $(compgen -P "$prefix" -W "$LSNS_COLS" -S ',' -- $realcur) )
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+			return 0
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+			;;
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+		'-p'|'--task')
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+			COMPREPLY=( $(compgen -W "$(cd /proc && echo [0-9]*)" -- $cur) )
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+			return 0
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+			;;
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+		'-t'|'--type')
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+			COMPREPLY=( $(compgen -W "mnt net ipc user pid uts" -- $cur) )
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+			return 0
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+			;;
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+		'-h'|'--help'|'-V'|'--version')
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+			return 0
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+			;;
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+	esac
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+	case $cur in
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+		-*)
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+			COMPREPLY=( $(compgen -W "
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+					--list
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+					--noheadings
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+					--output
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+					--task
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+					--raw
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+					--notruncate
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+					--type
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+					--help
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+					--version
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+				" -- $cur) )
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+			return 0
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+			;;
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+	esac
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+	COMPREPLY=( $(compgen -W "mnt net pid uts ipc user" -- $cur ) )
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+	return 0
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+}
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+complete -F _lsns_module lsns
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diff --git a/configure.ac b/configure.ac
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index f3c7214..5d9ea39 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -1032,6 +1032,12 @@ UL_REQUIRES_BUILD([lslogins], [libsmartcols])
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 AM_CONDITIONAL([BUILD_LSLOGINS], [test "x$build_lslogins" = xyes])
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+UL_BUILD_INIT([lsns], [check])
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+UL_REQUIRES_LINUX([lsns])
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+UL_REQUIRES_BUILD([lsns], [libsmartcols])
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+AM_CONDITIONAL([BUILD_LSNS], [test "x$build_lsns" = xyes])
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+
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+
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 UL_BUILD_INIT([chcpu], [check])
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 UL_REQUIRES_LINUX([chcpu])
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 UL_REQUIRES_HAVE([chcpu], [cpu_set_t], [cpu_set_t type])
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diff --git a/include/Makemodule.am b/include/Makemodule.am
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index 7b53244..757f317 100644
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--- a/include/Makemodule.am
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+++ b/include/Makemodule.am
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@@ -15,6 +15,7 @@ dist_noinst_HEADERS += \
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 	include/exec_shell.h \
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 	include/exitcodes.h \
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 	include/fileutils.h \
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+	include/idcache.h \
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 	include/ismounted.h \
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 	include/linux_reboot.h \
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 	include/linux_version.h \
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diff --git a/include/c.h b/include/c.h
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index 7b59ce8..a2779a5 100644
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--- a/include/c.h
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+++ b/include/c.h
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@@ -110,6 +110,14 @@
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 	_max1 > _max2 ? _max1 : _max2; })
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 #endif
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+#ifndef cmp_numbers
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+# define cmp_numbers(x, y) __extension__ ({	\
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+	__typeof__(x) _a = (x);			\
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+	__typeof__(y) _b = (y);			\
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+	(void) (&_a == &_b);			\
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+	_a == _b ? 0 : _a > _b ? 1 : -1; })
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+#endif
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+
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 #ifndef offsetof
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 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
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 #endif
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diff --git a/include/debug.h b/include/debug.h
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index 25045aa..848e474 100644
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--- a/include/debug.h
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+++ b/include/debug.h
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@@ -15,7 +15,7 @@ struct dbg_mask { char *mname; int val; };
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 #define UL_DEBUG_DEFINE_MASK(m) int m ## _debug_mask
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 #define UL_DEBUG_DECLARE_MASK(m) extern UL_DEBUG_DEFINE_MASK(m)
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-#define UL_DEBUG_DEFINE_MASKANEMS(m) static const struct dbg_mask m ## _masknames[]
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+#define UL_DEBUG_DEFINE_MASKNAMES(m) static const struct dbg_mask m ## _masknames[]
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 /* p - flag prefix, m - flag postfix */
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 #define UL_DEBUG_DEFINE_FLAG(p, m) p ## m
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diff --git a/include/idcache.h b/include/idcache.h
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new file mode 100644
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index 0000000..912edd5
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--- /dev/null
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+++ b/include/idcache.h
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@@ -0,0 +1,28 @@
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+#ifndef UTIL_LINUX_IDCACHE_H
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+#define UTIL_LINUX_IDCACHE_H
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+
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+#include <sys/types.h>
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+#include <pwd.h>
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+
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+#define IDCACHE_FLAGS_NAMELEN	(1 << 1)
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+
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+struct identry {
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+	unsigned long int	id;
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+	char			*name;
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+	struct identry		*next;
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+};
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+
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+struct idcache {
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+	struct identry	*ent;	/* first entry */
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+	int		width;	/* name width */
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+};
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+
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+
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+extern struct idcache *new_idcache(void);
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+extern void add_gid(struct idcache *cache, unsigned long int id);
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+extern void add_uid(struct idcache *cache, unsigned long int id);
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+
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+extern void free_idcache(struct idcache *ic);
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+extern struct identry *get_id(struct idcache *ic, unsigned long int id);
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+
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+#endif /* UTIL_LINUX_IDCACHE_H */
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diff --git a/include/procutils.h b/include/procutils.h
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index 14b766c..9f8dd76 100644
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--- a/include/procutils.h
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+++ b/include/procutils.h
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@@ -28,5 +28,7 @@ extern void proc_processes_filter_by_name(struct proc_processes *ps, const char
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 extern void proc_processes_filter_by_uid(struct proc_processes *ps, uid_t uid);
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 extern int proc_next_pid(struct proc_processes *ps, pid_t *pid);
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+extern char *proc_get_command(pid_t pid);
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+extern char *proc_get_command_name(pid_t pid);
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 #endif /* UTIL_LINUX_PROCUTILS */
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diff --git a/lib/Makemodule.am b/lib/Makemodule.am
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index eed31f1..73280f9 100644
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--- a/lib/Makemodule.am
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+++ b/lib/Makemodule.am
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@@ -8,6 +8,7 @@ libcommon_la_SOURCES = \
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 	lib/colors.c \
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 	lib/crc32.c \
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 	lib/env.c \
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+	lib/idcache.c \
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 	lib/fileutils.c \
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 	lib/ismounted.c \
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 	lib/mangle.c \
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diff --git a/lib/idcache.c b/lib/idcache.c
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new file mode 100644
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index 0000000..3c358b8
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--- /dev/null
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+++ b/lib/idcache.c
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@@ -0,0 +1,117 @@
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+
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+#include <wchar.h>
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+#include <pwd.h>
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+#include <grp.h>
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+#include <sys/types.h>
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+
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+#include "c.h"
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+#include "idcache.h"
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+
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+#ifndef LOGIN_NAME_MAX
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+#define LOGIN_NAME_MAX 256
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+#endif
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+
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+struct identry *get_id(struct idcache *ic, unsigned long int id)
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+{
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+	struct identry *ent;
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+
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+	if (!ic)
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+		return NULL;
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+
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+	for (ent = ic->ent; ent; ent = ent->next) {
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+		if (ent->id == id)
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+			return ent;
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+	}
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+
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+	return NULL;
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+}
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+
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+struct idcache *new_idcache()
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+{
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+	return calloc(1, sizeof(struct idcache));
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+}
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+
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+void free_idcache(struct idcache *ic)
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+{
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+	struct identry *ent = ic->ent;
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+
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+	while (ent) {
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+		struct identry *next = ent->next;
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+		free(ent->name);
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+		free(ent);
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+		ent = next;
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+	}
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+
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+	free(ic);
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+}
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+
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+static void add_id(struct idcache *ic, char *name, unsigned long int id)
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+{
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+	struct identry *ent, *x;
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+	int w = 0;
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+
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+	ent = calloc(1, sizeof(struct identry));
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+	if (!ent)
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+		return;
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+	ent->id = id;
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+
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+	if (name) {
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+#ifdef HAVE_WIDECHAR
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+		wchar_t wc[LOGIN_NAME_MAX + 1];
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+
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+		if (mbstowcs(wc, name, LOGIN_NAME_MAX) > 0) {
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+			wc[LOGIN_NAME_MAX] = '\0';
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+			w = wcswidth(wc, LOGIN_NAME_MAX);
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+		}
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+		else
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+#endif
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+			w = strlen(name);
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+	}
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+
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+	/* note, we ignore names with non-printable widechars */
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+	if (w > 0) {
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+		ent->name = strdup(name);
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+		if (!ent->name) {
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+			free(ent);
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+			return;
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+		}
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+	} else {
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+		if (asprintf(&ent->name, "%lu", id) < 0) {
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+			free(ent);
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+			return;
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+		}
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+	}
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+
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+	for (x = ic->ent; x && x->next; x = x->next);
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+
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+	if (x)
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+		x->next = ent;
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+	else
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+		ic->ent = ent;
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+
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+	if (w <= 0)
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+		w = ent->name ? strlen(ent->name) : 0;
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+	ic->width = ic->width < w ? w : ic->width;
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+	return;
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+}
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+
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+void add_uid(struct idcache *cache, unsigned long int id)
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+{
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+	struct identry *ent= get_id(cache, id);
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+
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+	if (!ent) {
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+		struct passwd *pw = getpwuid((uid_t) id);
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+		add_id(cache, pw ? pw->pw_name : NULL, id);
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+	}
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+}
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+
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+void add_gid(struct idcache *cache, unsigned long int id)
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+{
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+	struct identry *ent = get_id(cache, id);
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+
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+	if (!ent) {
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+		struct group *gr = getgrgid((gid_t) id);
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+		add_id(cache, gr ? gr->gr_name : NULL, id);
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+	}
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+}
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+
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diff --git a/lib/procutils.c b/lib/procutils.c
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index d633261..8dfdec9 100644
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--- a/lib/procutils.c
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+++ b/lib/procutils.c
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@@ -25,6 +25,7 @@
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 #include "procutils.h"
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 #include "at.h"
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 #include "c.h"
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+#include "all-io.h"
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 /*
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  * @pid: process ID for which we want to obtain the threads group
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@@ -193,6 +194,48 @@ int proc_next_pid(struct proc_processes *ps, pid_t *pid)
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 	return 0;
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 }
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+/* returns process command path, use free() for result */
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+static char *proc_file_strdup(pid_t pid, const char *name)
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+{
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+	char buf[BUFSIZ], *res = NULL;
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+	ssize_t sz = 0;
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+	size_t i;
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+	int fd;
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+
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+	snprintf(buf, sizeof(buf), "/proc/%d/%s", (int) pid, name);
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+	fd = open(buf, O_RDONLY);
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+	if (fd < 0)
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+		goto done;
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+
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+	sz = read_all(fd, buf, sizeof(buf));
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+	if (sz <= 0)
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+		goto done;
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+
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+	for (i = 0; i < (size_t) sz; i++) {
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+
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+		if (buf[i] == '\0')
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+			buf[i] = ' ';
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+	}
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+	buf[sz - 1] = '\0';
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+	res = strdup(buf);
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+done:
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+	if (fd >= 0)
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+		close(fd);
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+	return res;
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+}
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+
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+/* returns process command path, use free() for result */
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+char *proc_get_command(pid_t pid)
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+{
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+	return proc_file_strdup(pid, "cmdline");
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+}
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+
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+/* returns process command name, use free() for result */
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+char *proc_get_command_name(pid_t pid)
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+{
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+	return proc_file_strdup(pid, "comm");
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+}
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+
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 #ifdef TEST_PROGRAM
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 static int test_tasks(int argc, char *argv[])
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diff --git a/sys-utils/Makemodule.am b/sys-utils/Makemodule.am
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index c6c561c..9baf5a3 100644
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--- a/sys-utils/Makemodule.am
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+++ b/sys-utils/Makemodule.am
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@@ -182,6 +182,13 @@ prlimit_SOURCES = sys-utils/prlimit.c
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 prlimit_LDADD = $(LDADD) libcommon.la
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 endif
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+if BUILD_LSNS
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+usrbin_exec_PROGRAMS += lsns
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+dist_man_MANS += sys-utils/lsns.8
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+lsns_SOURCES =	sys-utils/lsns.c
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+lsns_LDADD = $(LDADD) libcommon.la libsmartcols.la
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+lsns_CFLAGS = $(AM_CFLAGS) -I$(ul_libsmartcols_incdir)
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+endif
531551
 
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 if BUILD_MOUNT
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 #
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diff --git a/sys-utils/lsns.8 b/sys-utils/lsns.8
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new file mode 100644
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index 0000000..328df47
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--- /dev/null
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+++ b/sys-utils/lsns.8
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@@ -0,0 +1,78 @@
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+.\" Man page for the lsns command.
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+.\" Copyright 2015 Karel Zak <kzak@redhat.com>
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+.\" May be distributed under the GNU General Public License
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+
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+.TH LSNS 8 "December 2015" "util-linux" "System Administration"
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+.SH NAME
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+lsns \- list namespaces
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+.SH SYNOPSIS
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+.B lsns
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+[options]
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+.RI [ namespace ]
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+
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+.SH DESCRIPTION
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+.B lsns
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+lists information about all the currently accessible namespaces or about the
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+given \fInamespace\fP.  The \fInamespace\fP identifier is an inode number.
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+
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+The default output is subject to change.  So whenever possible, you should
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+avoid using default outputs in your scripts.  Always explicitly define expected
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+columns by using the \fB\-\-output\fR option together with a columns list in
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+environments where a stable output is required.
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+
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+Note that \fBlsns\fR reads information directly from the /proc filesystem and
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+for non-root users it may return incomplete information.  The current /proc
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+filesystem may be unshared and affected by a PID namespace
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+(see \fBunshare \-\-mount\-proc\fP for more details).
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+.B lsns
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+is not able to see persistent namespaces without processes where the namespace
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+instance is held by a bind mount to /proc/\fIpid\fR/ns/\fItype\fR.
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+
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+.SH OPTIONS
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+.TP
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+.BR \-l , " \-\-list"
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+Use list output format.
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+.TP
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+.BR \-n , " \-\-noheadings"
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+Do not print a header line.
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+.TP
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+.BR \-o , " \-\-output " \fIlist\fP
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+Specify which output columns to print.  Use \fB\-\-help\fR
531551
+to get a list of all supported columns.
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+
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+The default list of columns may be extended if \fIlist\fP is
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+specified in the format \fB+\fIlist\fP (e.g. \fBlsns \-o +PATH\fP).
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+.TP
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+.BR \-p , " \-\-task " \fIpid\fP
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+Display only the namespaces held by the process with this \fIpid\fR.
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+.TP
531551
+.BR \-r , " \-\-raw"
531551
+Use the raw output format.
531551
+.TP
531551
+.BR \-t , " \-\-type " \fItype\fP
531551
+Display the specified \fItype\fP of namespaces only.  The supported types are
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+\fBmnt\fP, \fBnet\fP, \fBipc\fP, \fBuser\fP, \fBpid\fP and \fButs\fP.  This
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+option may be given more than once.
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+.TP
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+.BR \-u , " \-\-notruncate"
531551
+Do not truncate text in columns.
531551
+.TP
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+.BR \-V , " \-\-version"
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+Display version information and exit.
531551
+.TP
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+.BR \-h , " \-\-help"
531551
+Display help text and exit.
531551
+
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+.SH AUTHORS
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+.nf
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+Karel Zak <kzak@redhat.com>
531551
+.fi
531551
+
531551
+.SH "SEE ALSO"
531551
+.BR unshare (1),
531551
+.BR nsenter (1),
531551
+.BR clone (2)
531551
+
531551
+.SH AVAILABILITY
531551
+The lsns command is part of the util-linux package and is available from
531551
+ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
531551
diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
531551
new file mode 100644
531551
index 0000000..5ee2981
531551
--- /dev/null
531551
+++ b/sys-utils/lsns.c
531551
@@ -0,0 +1,748 @@
531551
+/*
531551
+ * lsns(8) - list system namespaces
531551
+ *
531551
+ * Copyright (C) 2015 Karel Zak <kzak@redhat.com>
531551
+ *
531551
+ * This program is free software; you can redistribute it and/or modify
531551
+ * it under the terms of the GNU General Public License as published by
531551
+ * the Free Software Foundation; either version 2 of the License, or
531551
+ * (at your option) any later version.
531551
+ *
531551
+ * This program is distributed in the hope that it would be useful,
531551
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
531551
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
531551
+ * GNU General Public License for more details.
531551
+ *
531551
+ * You should have received a copy of the GNU General Public License
531551
+ * along with this program; if not, write to the Free Software Foundation,
531551
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
531551
+ */
531551
+#include <stdio.h>
531551
+#include <string.h>
531551
+#include <getopt.h>
531551
+#include <stdlib.h>
531551
+#include <assert.h>
531551
+#include <dirent.h>
531551
+#include <unistd.h>
531551
+#include <sys/stat.h>
531551
+#include <sys/types.h>
531551
+#include <wchar.h>
531551
+#include <libsmartcols.h>
531551
+
531551
+#include "pathnames.h"
531551
+#include "nls.h"
531551
+#include "xalloc.h"
531551
+#include "c.h"
531551
+#include "list.h"
531551
+#include "closestream.h"
531551
+#include "optutils.h"
531551
+#include "procutils.h"
531551
+#include "strutils.h"
531551
+#include "namespace.h"
531551
+#include "path.h"
531551
+#include "idcache.h"
531551
+
531551
+#include "debug.h"
531551
+
531551
+UL_DEBUG_DEFINE_MASK(lsns);
531551
+UL_DEBUG_DEFINE_MASKNAMES(lsns) = UL_DEBUG_EMPTY_MASKNAMES;
531551
+
531551
+#define LSNS_DEBUG_INIT		(1 << 1)
531551
+#define LSNS_DEBUG_PROC		(1 << 2)
531551
+#define LSNS_DEBUG_NS		(1 << 3)
531551
+#define LSNS_DEBUG_ALL		0xFFFF
531551
+
531551
+#define DBG(m, x)       __UL_DBG(lsns, LSNS_DEBUG_, m, x)
531551
+#define ON_DBG(m, x)    __UL_DBG_CALL(lsns, LSNS_DEBUG_, m, x)
531551
+
531551
+struct idcache *uid_cache = NULL;
531551
+
531551
+/* column IDs */
531551
+enum {
531551
+	COL_NS = 0,
531551
+	COL_TYPE,
531551
+	COL_PATH,
531551
+	COL_NPROCS,
531551
+	COL_PID,
531551
+	COL_PPID,
531551
+	COL_COMMAND,
531551
+	COL_UID,
531551
+	COL_USER
531551
+};
531551
+
531551
+/* column names */
531551
+struct colinfo {
531551
+	const char *name; /* header */
531551
+	double	   whint; /* width hint (N < 1 is in percent of termwidth) */
531551
+	int	   flags; /* SCOLS_FL_* */
531551
+	const char *help;
531551
+};
531551
+
531551
+/* columns descriptions */
531551
+static const struct colinfo infos[] = {
531551
+	[COL_NS]      = { "NS",     10, SCOLS_FL_RIGHT, N_("namespace identifier (inode number)") },
531551
+	[COL_TYPE]    = { "TYPE",    5, 0, N_("kind of namespace") },
531551
+	[COL_PATH]    = { "PATH",    0, 0, N_("path to the namespace")},
531551
+	[COL_NPROCS]  = { "NPROCS",  5, SCOLS_FL_RIGHT, N_("number of processes in the namespace") },
531551
+	[COL_PID]     = { "PID",     5, SCOLS_FL_RIGHT, N_("lowest PID in the namespace") },
531551
+	[COL_PPID]    = { "PPID",    5, SCOLS_FL_RIGHT, N_("PPID of the PID") },
531551
+	[COL_COMMAND] = { "COMMAND", 0, SCOLS_FL_TRUNC, N_("command line of the PID")},
531551
+	[COL_UID]     = { "UID",     0, SCOLS_FL_RIGHT, N_("UID of the PID")},
531551
+	[COL_USER]    = { "USER",    0, 0, N_("username of the PID")}
531551
+};
531551
+
531551
+static int columns[ARRAY_SIZE(infos) * 2];
531551
+static size_t ncolumns;
531551
+
531551
+enum {
531551
+	LSNS_ID_MNT = 0,
531551
+	LSNS_ID_NET,
531551
+	LSNS_ID_PID,
531551
+	LSNS_ID_UTS,
531551
+	LSNS_ID_IPC,
531551
+	LSNS_ID_USER
531551
+};
531551
+
531551
+static char *ns_names[] = {
531551
+	[LSNS_ID_MNT] = "mnt",
531551
+	[LSNS_ID_NET] = "net",
531551
+	[LSNS_ID_PID] = "pid",
531551
+	[LSNS_ID_UTS] = "uts",
531551
+	[LSNS_ID_IPC] = "ipc",
531551
+	[LSNS_ID_USER] = "user"
531551
+};
531551
+
531551
+struct lsns_namespace {
531551
+	ino_t id;
531551
+	int type;			/* LSNS_* */
531551
+	int nprocs;
531551
+
531551
+	struct lsns_process *proc;
531551
+
531551
+	struct list_head namespaces;	/* lsns->processes member */
531551
+	struct list_head processes;	/* head of lsns_process *siblings */
531551
+};
531551
+
531551
+struct lsns_process {
531551
+	pid_t pid;		/* process PID */
531551
+	pid_t ppid;		/* parent's PID */
531551
+	pid_t tpid;		/* thread group */
531551
+	char state;
531551
+	uid_t uid;
531551
+
531551
+	ino_t            ns_ids[ARRAY_SIZE(ns_names)];
531551
+	struct list_head ns_siblings[ARRAY_SIZE(ns_names)];
531551
+
531551
+	struct list_head processes;	/* list of processes */
531551
+
531551
+	struct libscols_line *outline;
531551
+	struct lsns_process *parent;
531551
+};
531551
+
531551
+struct lsns {
531551
+	struct list_head processes;
531551
+	struct list_head namespaces;
531551
+
531551
+	pid_t	fltr_pid;	/* filter out by PID */
531551
+	ino_t	fltr_ns;	/* filter out by namespace */
531551
+	int	fltr_types[ARRAY_SIZE(ns_names)];
531551
+	int	fltr_ntypes;
531551
+
531551
+	unsigned int raw	: 1,
531551
+		     tree	: 1,
531551
+		     list	: 1,
531551
+		     notrunc	: 1,
531551
+		     no_headings: 1;
531551
+};
531551
+
531551
+static void lsns_init_debug(void)
531551
+{
531551
+	__UL_INIT_DEBUG(lsns, LSNS_DEBUG_, 0, LSNS_DEBUG);
531551
+}
531551
+
531551
+static int ns_name2type(const char *name)
531551
+{
531551
+	size_t i;
531551
+
531551
+	for (i = 0; i < ARRAY_SIZE(ns_names); i++) {
531551
+		if (strcmp(ns_names[i], name) == 0)
531551
+			return i;
531551
+	}
531551
+	return -1;
531551
+}
531551
+
531551
+static int column_name_to_id(const char *name, size_t namesz)
531551
+{
531551
+	size_t i;
531551
+
531551
+	assert(name);
531551
+
531551
+	for (i = 0; i < ARRAY_SIZE(infos); i++) {
531551
+		const char *cn = infos[i].name;
531551
+
531551
+		if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
531551
+			return i;
531551
+	}
531551
+	warnx(_("unknown column: %s"), name);
531551
+	return -1;
531551
+}
531551
+
531551
+static inline int get_column_id(int num)
531551
+{
531551
+	assert(num >= 0);
531551
+	assert((size_t) num < ncolumns);
531551
+	assert(columns[num] < (int) ARRAY_SIZE(infos));
531551
+
531551
+	return columns[num];
531551
+}
531551
+
531551
+static inline const struct colinfo *get_column_info(unsigned num)
531551
+{
531551
+	return &infos[ get_column_id(num) ];
531551
+}
531551
+
531551
+static ino_t get_ns_ino(int dir, const char *nsname, ino_t *ino)
531551
+{
531551
+	struct stat st;
531551
+	char path[16];
531551
+
531551
+	snprintf(path, sizeof(path), "ns/%s", nsname);
531551
+
531551
+	if (fstatat(dir, path, &st, 0) != 0)
531551
+		return -errno;
531551
+	*ino = st.st_ino;
531551
+	return 0;
531551
+}
531551
+
531551
+
531551
+static int read_process(struct lsns *ls, pid_t pid)
531551
+{
531551
+	struct lsns_process *p = NULL;
531551
+	char buf[BUFSIZ];
531551
+	DIR *dir;
531551
+	int rc = 0, fd;
531551
+	FILE *f = NULL;
531551
+	size_t i;
531551
+	struct stat st;
531551
+
531551
+	DBG(PROC, ul_debug("reading %d", (int) pid));
531551
+
531551
+	snprintf(buf, sizeof(buf), "/proc/%d", pid);
531551
+	dir = opendir(buf);
531551
+	if (!dir)
531551
+		return -errno;
531551
+
531551
+	p = xcalloc(1, sizeof(*p));
531551
+	if (!p) {
531551
+		rc = -ENOMEM;
531551
+		goto done;
531551
+	}
531551
+
531551
+	if (fstat(dirfd(dir), &st) == 0) {
531551
+		p->uid = st.st_uid;
531551
+		add_uid(uid_cache, st.st_uid);
531551
+	}
531551
+
531551
+	fd = openat(dirfd(dir), "stat", O_RDONLY);
531551
+	if (fd < 0) {
531551
+		rc = -errno;
531551
+		goto done;
531551
+	}
531551
+	if (!(f = fdopen(fd, "r"))) {
531551
+		rc = -errno;
531551
+		goto done;
531551
+	}
531551
+	rc = fscanf(f, "%d %*s %c %d*[^\n]", &p->pid, &p->state, &p->ppid);
531551
+	if (rc != 3) {
531551
+		rc = rc < 0 ? -errno : -EINVAL;
531551
+		goto done;
531551
+	}
531551
+	rc = 0;
531551
+
531551
+	for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
531551
+		INIT_LIST_HEAD(&p->ns_siblings[i]);
531551
+
531551
+		if (!ls->fltr_types[i])
531551
+			continue;
531551
+
531551
+		rc = get_ns_ino(dirfd(dir), ns_names[i], &p->ns_ids[i]);
531551
+		if (rc && rc != -EACCES)
531551
+			goto done;
531551
+		rc = 0;
531551
+	}
531551
+
531551
+	INIT_LIST_HEAD(&p->processes);
531551
+
531551
+	DBG(PROC, ul_debugobj(p, "new pid=%d", p->pid));
531551
+	list_add_tail(&p->processes, &ls->processes);
531551
+done:
531551
+	if (f)
531551
+		fclose(f);
531551
+	closedir(dir);
531551
+	if (rc)
531551
+		free(p);
531551
+	return rc;
531551
+}
531551
+
531551
+static int read_processes(struct lsns *ls)
531551
+{
531551
+	struct proc_processes *proc = NULL;
531551
+	pid_t pid;
531551
+	int rc = 0;
531551
+
531551
+	DBG(PROC, ul_debug("opening /proc"));
531551
+
531551
+	if (!(proc = proc_open_processes())) {
531551
+		rc = -errno;
531551
+		goto done;
531551
+	}
531551
+
531551
+	while (proc_next_pid(proc, &pid) == 0) {
531551
+		rc = read_process(ls, pid);
531551
+		if (rc && rc != -EACCES && rc != -ENOENT)
531551
+			break;
531551
+		rc = 0;
531551
+	}
531551
+done:
531551
+	DBG(PROC, ul_debug("closing /proc"));
531551
+	proc_close_processes(proc);
531551
+	return rc;
531551
+}
531551
+
531551
+static struct lsns_namespace *get_namespace(struct lsns *ls, ino_t ino)
531551
+{
531551
+	struct list_head *p;
531551
+
531551
+	list_for_each(p, &ls->namespaces) {
531551
+		struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
531551
+
531551
+		if (ns->id == ino)
531551
+			return ns;
531551
+	}
531551
+	return NULL;
531551
+}
531551
+
531551
+static int namespace_has_process(struct lsns_namespace *ns, pid_t pid)
531551
+{
531551
+	struct list_head *p;
531551
+
531551
+	list_for_each(p, &ns->processes) {
531551
+		struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
531551
+
531551
+		if (proc->pid == pid)
531551
+			return 1;
531551
+	}
531551
+	return 0;
531551
+}
531551
+
531551
+static struct lsns_namespace *add_namespace(struct lsns *ls, int type, ino_t ino)
531551
+{
531551
+	struct lsns_namespace *ns = xcalloc(1, sizeof(*ns));
531551
+
531551
+	if (!ns)
531551
+		return NULL;
531551
+
531551
+	DBG(NS, ul_debugobj(ns, "new %s[%ju]", ns_names[type], (uintmax_t)ino));
531551
+
531551
+	INIT_LIST_HEAD(&ns->processes);
531551
+	INIT_LIST_HEAD(&ns->namespaces);
531551
+
531551
+	ns->type = type;
531551
+	ns->id = ino;
531551
+
531551
+	list_add_tail(&ns->namespaces, &ls->namespaces);
531551
+	return ns;
531551
+}
531551
+
531551
+static int add_process_to_namespace(struct lsns *ls, struct lsns_namespace *ns, struct lsns_process *proc)
531551
+{
531551
+	struct list_head *p;
531551
+
531551
+	DBG(NS, ul_debugobj(ns, "add process [%p] pid=%d to %s[%ju]",
531551
+		proc, proc->pid, ns_names[ns->type], (uintmax_t)ns->id));
531551
+
531551
+	list_for_each(p, &ls->processes) {
531551
+		struct lsns_process *xproc = list_entry(p, struct lsns_process, processes);
531551
+
531551
+		if (xproc->pid == proc->ppid)		/* my parent */
531551
+			proc->parent = xproc;
531551
+		else if (xproc->ppid == proc->pid)	/* my child */
531551
+			xproc->parent = proc;
531551
+	}
531551
+
531551
+	list_add_tail(&proc->ns_siblings[ns->type], &ns->processes);
531551
+	ns->nprocs++;
531551
+
531551
+	if (!ns->proc || ns->proc->pid > proc->pid)
531551
+		ns->proc = proc;
531551
+
531551
+	return 0;
531551
+}
531551
+
531551
+static int cmp_namespaces(struct list_head *a, struct list_head *b,
531551
+			  __attribute__((__unused__)) void *data)
531551
+{
531551
+	struct lsns_namespace *xa = list_entry(a, struct lsns_namespace, namespaces),
531551
+			      *xb = list_entry(b, struct lsns_namespace, namespaces);
531551
+
531551
+	return cmp_numbers(xa->id, xb->id);
531551
+}
531551
+
531551
+static int read_namespaces(struct lsns *ls)
531551
+{
531551
+	struct list_head *p;
531551
+
531551
+	DBG(NS, ul_debug("reading namespace"));
531551
+
531551
+	list_for_each(p, &ls->processes) {
531551
+		size_t i;
531551
+		struct lsns_namespace *ns;
531551
+		struct lsns_process *proc = list_entry(p, struct lsns_process, processes);
531551
+
531551
+		for (i = 0; i < ARRAY_SIZE(proc->ns_ids); i++) {
531551
+			if (proc->ns_ids[i] == 0)
531551
+				continue;
531551
+			if (!(ns = get_namespace(ls, proc->ns_ids[i]))) {
531551
+				ns = add_namespace(ls, i, proc->ns_ids[i]);
531551
+				if (!ns)
531551
+					return -ENOMEM;
531551
+			}
531551
+			add_process_to_namespace(ls, ns, proc);
531551
+		}
531551
+	}
531551
+
531551
+	list_sort(&ls->namespaces, cmp_namespaces, NULL);
531551
+
531551
+	return 0;
531551
+}
531551
+
531551
+static void add_scols_line(struct lsns *ls, struct libscols_table *table,
531551
+			   struct lsns_namespace *ns, struct lsns_process *proc)
531551
+{
531551
+	size_t i;
531551
+	struct libscols_line *line;
531551
+
531551
+	assert(ns);
531551
+	assert(table);
531551
+
531551
+	line = scols_table_new_line(table,
531551
+			ls->tree && proc->parent ? proc->parent->outline : NULL);
531551
+	if (!line) {
531551
+		warn(_("failed to add line to output"));
531551
+		return;
531551
+	}
531551
+
531551
+	for (i = 0; i < ncolumns; i++) {
531551
+		char *str = NULL;
531551
+
531551
+		switch (get_column_id(i)) {
531551
+		case COL_NS:
531551
+			xasprintf(&str, "%ju", (uintmax_t)ns->id);
531551
+			break;
531551
+		case COL_PID:
531551
+			xasprintf(&str, "%d", (int) proc->pid);
531551
+			break;
531551
+		case COL_PPID:
531551
+			xasprintf(&str, "%d", (int) proc->ppid);
531551
+			break;
531551
+		case COL_TYPE:
531551
+			xasprintf(&str, "%s", ns_names[ns->type]);
531551
+			break;
531551
+		case COL_NPROCS:
531551
+			xasprintf(&str, "%d", ns->nprocs);
531551
+			break;
531551
+		case COL_COMMAND:
531551
+			str = proc_get_command(proc->pid);
531551
+			if (!str)
531551
+				str = proc_get_command_name(proc->pid);
531551
+			break;
531551
+		case COL_PATH:
531551
+			xasprintf(&str, "/proc/%d/ns/%s", (int) proc->pid, ns_names[ns->type]);
531551
+			break;
531551
+		case COL_UID:
531551
+			xasprintf(&str, "%d", (int) proc->uid);
531551
+			break;
531551
+		case COL_USER:
531551
+			xasprintf(&str, "%s", get_id(uid_cache, proc->uid)->name);
531551
+			break;
531551
+		default:
531551
+			break;
531551
+		}
531551
+
531551
+		if (str)
531551
+			scols_line_set_data(line, i, str);
531551
+	}
531551
+
531551
+	proc->outline = line;
531551
+}
531551
+
531551
+static struct libscols_table *init_scols_table(struct lsns *ls)
531551
+{
531551
+	struct libscols_table *tab;
531551
+	size_t i;
531551
+
531551
+	tab = scols_new_table();
531551
+	if (!tab) {
531551
+		warn(_("failed to initialize output table"));
531551
+		return NULL;
531551
+	}
531551
+
531551
+	scols_table_enable_raw(tab, ls->raw);
531551
+	scols_table_enable_noheadings(tab, ls->no_headings);
531551
+
531551
+	for (i = 0; i < ncolumns; i++) {
531551
+		const struct colinfo *col = get_column_info(i);
531551
+		int flags = col->flags;
531551
+
531551
+		if (ls->notrunc)
531551
+		       flags &= ~SCOLS_FL_TRUNC;
531551
+		if (ls->tree && get_column_id(i) == COL_COMMAND)
531551
+			flags |= SCOLS_FL_TREE;
531551
+
531551
+		if (!scols_table_new_column(tab, col->name, col->whint, flags)) {
531551
+			warnx(_("failed to initialize output column"));
531551
+			goto err;
531551
+		}
531551
+	}
531551
+
531551
+	return tab;
531551
+err:
531551
+	scols_unref_table(tab);
531551
+	return NULL;
531551
+}
531551
+
531551
+static int show_namespaces(struct lsns *ls)
531551
+{
531551
+	struct libscols_table *tab;
531551
+	struct list_head *p;
531551
+	int rc = 0;
531551
+
531551
+	tab = init_scols_table(ls);
531551
+	if (!tab)
531551
+		return -ENOMEM;
531551
+
531551
+	list_for_each(p, &ls->namespaces) {
531551
+		struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
531551
+
531551
+		if (ls->fltr_pid != 0 && !namespace_has_process(ns, ls->fltr_pid))
531551
+			continue;
531551
+
531551
+		add_scols_line(ls, tab, ns, ns->proc);
531551
+	}
531551
+
531551
+	scols_print_table(tab);
531551
+	scols_unref_table(tab);
531551
+	return rc;
531551
+}
531551
+
531551
+static void show_process(struct lsns *ls, struct libscols_table *tab,
531551
+			 struct lsns_process *proc, struct lsns_namespace *ns)
531551
+{
531551
+	/*
531551
+	 * create a tree from parent->child relation, but only if the parent is
531551
+	 * within the same namespace
531551
+	 */
531551
+	if (ls->tree
531551
+	    && proc->parent
531551
+	    && !proc->parent->outline
531551
+	    && proc->parent->ns_ids[ns->type] == proc->ns_ids[ns->type])
531551
+		show_process(ls, tab, proc->parent, ns);
531551
+
531551
+	add_scols_line(ls, tab, ns, proc);
531551
+}
531551
+
531551
+
531551
+static int show_namespace_processes(struct lsns *ls, struct lsns_namespace *ns)
531551
+{
531551
+	struct libscols_table *tab;
531551
+	struct list_head *p;
531551
+
531551
+	tab = init_scols_table(ls);
531551
+	if (!tab)
531551
+		return -ENOMEM;
531551
+
531551
+	list_for_each(p, &ns->processes) {
531551
+		struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
531551
+
531551
+		if (!proc->outline)
531551
+			show_process(ls, tab, proc, ns);
531551
+	}
531551
+
531551
+
531551
+	scols_print_table(tab);
531551
+	scols_unref_table(tab);
531551
+	return 0;
531551
+}
531551
+
531551
+static void __attribute__ ((__noreturn__)) usage(FILE * out)
531551
+{
531551
+	size_t i;
531551
+
531551
+	fputs(USAGE_HEADER, out);
531551
+
531551
+	fprintf(out,
531551
+		_(" %s [options] [<namespace>]\n"), program_invocation_short_name);
531551
+
531551
+	fputs(USAGE_SEPARATOR, out);
531551
+	fputs(_("List system namespaces.\n"), out);
531551
+
531551
+	fputs(USAGE_OPTIONS, out);
531551
+	fputs(_(" -l, --list             use list format output\n"), out);
531551
+	fputs(_(" -n, --noheadings       don't print headings\n"), out);
531551
+	fputs(_(" -o, --output <list>    define which output columns to use\n"), out);
531551
+	fputs(_(" -p, --task <pid>       print process namespaces\n"), out);
531551
+	fputs(_(" -r, --raw              use the raw output format\n"), out);
531551
+	fputs(_(" -u, --notruncate       don't truncate text in columns\n"), out);
531551
+	fputs(_(" -t, --type <name>      namespace type (mnt, net, ipc, user, pid, uts)\n"), out);
531551
+
531551
+	fputs(USAGE_SEPARATOR, out);
531551
+	fputs(USAGE_HELP, out);
531551
+	fputs(USAGE_VERSION, out);
531551
+
531551
+	fputs(_("\nAvailable columns (for --output):\n"), out);
531551
+
531551
+	for (i = 0; i < ARRAY_SIZE(infos); i++)
531551
+		fprintf(out, " %11s  %s\n", infos[i].name, _(infos[i].help));
531551
+
531551
+	fprintf(out, USAGE_MAN_TAIL("lsns(8)"));
531551
+
531551
+	exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
531551
+}
531551
+
531551
+
531551
+int main(int argc, char *argv[])
531551
+{
531551
+	struct lsns ls;
531551
+	int c;
531551
+	int r = 0;
531551
+	char *outarg = NULL;
531551
+	static const struct option long_opts[] = {
531551
+		{ "task",       required_argument, NULL, 'p' },
531551
+		{ "help",	no_argument,       NULL, 'h' },
531551
+		{ "output",     required_argument, NULL, 'o' },
531551
+		{ "notruncate", no_argument,       NULL, 'u' },
531551
+		{ "version",    no_argument,       NULL, 'V' },
531551
+		{ "noheadings", no_argument,       NULL, 'n' },
531551
+		{ "list",       no_argument,       NULL, 'l' },
531551
+		{ "raw",        no_argument,       NULL, 'r' },
531551
+		{ "type",       required_argument, NULL, 't' },
531551
+		{ NULL, 0, NULL, 0 }
531551
+	};
531551
+
531551
+	static const ul_excl_t excl[] = {	/* rows and cols in ASCII order */
531551
+		{ 'J','r' },
531551
+		{ 0 }
531551
+	};
531551
+	int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
531551
+
531551
+	setlocale(LC_ALL, "");
531551
+	bindtextdomain(PACKAGE, LOCALEDIR);
531551
+	textdomain(PACKAGE);
531551
+	atexit(close_stdout);
531551
+
531551
+	lsns_init_debug();
531551
+	memset(&ls, 0, sizeof(ls));
531551
+
531551
+	INIT_LIST_HEAD(&ls.processes);
531551
+	INIT_LIST_HEAD(&ls.namespaces);
531551
+
531551
+	while ((c = getopt_long(argc, argv,
531551
+				"lp:o:nruhVt:", long_opts, NULL)) != -1) {
531551
+
531551
+		err_exclusive_options(c, long_opts, excl, excl_st);
531551
+
531551
+		switch(c) {
531551
+		case 'l':
531551
+			ls.list = 1;
531551
+			break;
531551
+		case 'o':
531551
+			outarg = optarg;
531551
+			break;
531551
+		case 'V':
531551
+			printf(UTIL_LINUX_VERSION);
531551
+			return EXIT_SUCCESS;
531551
+		case 'p':
531551
+			ls.fltr_pid = strtos32_or_err(optarg, _("invalid PID argument"));
531551
+			break;
531551
+		case 'h':
531551
+			usage(stdout);
531551
+		case 'n':
531551
+			ls.no_headings = 1;
531551
+			break;
531551
+		case 'r':
531551
+			ls.raw = 1;
531551
+			break;
531551
+		case 'u':
531551
+			ls.notrunc = 1;
531551
+			break;
531551
+		case 't':
531551
+		{
531551
+			int type = ns_name2type(optarg);
531551
+			if (type < 0)
531551
+				errx(EXIT_FAILURE, _("unknown namespace type: %s"), optarg);
531551
+			ls.fltr_types[type] = 1;
531551
+			ls.fltr_ntypes++;
531551
+			break;
531551
+		}
531551
+		case '?':
531551
+		default:
531551
+			usage(stderr);
531551
+		}
531551
+	}
531551
+
531551
+	if (!ls.fltr_ntypes) {
531551
+		size_t i;
531551
+		for (i = 0; i < ARRAY_SIZE(ns_names); i++)
531551
+			ls.fltr_types[i] = 1;
531551
+	}
531551
+
531551
+	if (optind < argc) {
531551
+		if (ls.fltr_pid)
531551
+			errx(EXIT_FAILURE, _("--task is mutually exclusive with <namespace>"));
531551
+		ls.fltr_ns = strtou64_or_err(argv[optind], _("invalid namespace argument"));
531551
+		ls.tree = ls.list ? 0 : 1;
531551
+
531551
+		if (!ncolumns) {
531551
+			columns[ncolumns++] = COL_PID;
531551
+			columns[ncolumns++] = COL_PPID;
531551
+			columns[ncolumns++] = COL_USER;
531551
+			columns[ncolumns++] = COL_COMMAND;
531551
+		}
531551
+	}
531551
+
531551
+	if (!ncolumns) {
531551
+		columns[ncolumns++] = COL_NS;
531551
+		columns[ncolumns++] = COL_TYPE;
531551
+		columns[ncolumns++] = COL_NPROCS;
531551
+		columns[ncolumns++] = COL_PID;
531551
+		columns[ncolumns++] = COL_USER;
531551
+		columns[ncolumns++] = COL_COMMAND;
531551
+	}
531551
+
531551
+	if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
531551
+					(int *) &ncolumns, column_name_to_id) < 0)
531551
+		return EXIT_FAILURE;
531551
+
531551
+	scols_init_debug(0);
531551
+
531551
+	uid_cache = new_idcache();
531551
+	if (!uid_cache)
531551
+		err(EXIT_FAILURE, _("failed to allocate UID cache"));
531551
+
531551
+	r = read_processes(&ls);
531551
+	if (!r)
531551
+		r = read_namespaces(&ls);
531551
+	if (!r) {
531551
+		if (ls.fltr_ns) {
531551
+			struct lsns_namespace *ns = get_namespace(&ls, ls.fltr_ns);
531551
+
531551
+			if (!ns)
531551
+				errx(EXIT_FAILURE, _("not found namespace: %ju"), (uintmax_t) ls.fltr_ns);
531551
+			r = show_namespace_processes(&ls, ns);
531551
+		} else
531551
+			r = show_namespaces(&ls);
531551
+	}
531551
+
531551
+	free_idcache(uid_cache);
531551
+	return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
531551
+}
531551
-- 
531551
2.7.4
531551