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Blame SOURCES/0378-mount-use-libmount-to-enumerate-proc-self-mountinfo.patch

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From 53b2695b96c6e8717a375cc2a17fcc4384d04790 Mon Sep 17 00:00:00 2001
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From: Chris Leech <cleech@redhat.com>
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Date: Sun, 23 Nov 2014 20:33:37 -0800
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Subject: [PATCH] mount: use libmount to enumerate /proc/self/mountinfo
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This lets libmount add in user options from /run/mount/utab, like
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_netdev which is needed to get proper ordering against remote-fs.target
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Conflicts:
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	Makefile.am
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	README
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	configure.ac
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	src/core/mount.c
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(cherry-picked from 8d3ae2bd4c9bf9fc2e57f7b3776325a1c750ca30)
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Related: #1161417
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---
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 .travis.yml      |  2 +-
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 Makefile.am      |  4 +++-
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 README           |  1 +
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 configure.ac     | 10 +++++++++
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 src/core/mount.c | 65 ++++++++++++++++++++++++++------------------------------
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 5 files changed, 45 insertions(+), 37 deletions(-)
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diff --git a/.travis.yml b/.travis.yml
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index 7e5251c..4ea2bc2 100644
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--- a/.travis.yml
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+++ b/.travis.yml
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@@ -3,7 +3,7 @@ compiler:
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   - gcc
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 before_install:
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  - sudo apt-get update -qq
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- - sudo apt-get install autotools-dev automake autoconf libtool libdbus-1-dev libcap-dev libblkid-dev libpam-dev libcryptsetup-dev libaudit-dev libacl1-dev libattr1-dev libselinux-dev liblzma-dev libgcrypt-dev libqrencode-dev libmicrohttpd-dev gtk-doc-tools gperf python2.7-dev
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+ - sudo apt-get install autotools-dev automake autoconf libtool libdbus-1-dev libcap-dev libblkid-dev libmount-dev libpam-dev libcryptsetup-dev libaudit-dev libacl1-dev libattr1-dev libselinux-dev liblzma-dev libgcrypt-dev libqrencode-dev libmicrohttpd-dev gtk-doc-tools gperf python2.7-dev
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 script: ./autogen.sh && ./configure --enable-gtk-doc --enable-gtk-doc-pdf && make V=1 && sudo ./systemd-machine-id-setup && make check && make distcheck
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 after_failure: cat test-suite.log
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 notifications:
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diff --git a/Makefile.am b/Makefile.am
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index faf2a32..0891bca 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -997,6 +997,7 @@ libsystemd_core_la_CFLAGS = \
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 	$(PAM_CFLAGS) \
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 	$(AUDIT_CFLAGS) \
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 	$(KMOD_CFLAGS) \
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+	$(MOUNT_CFLAGS) \
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 	-pthread
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 libsystemd_core_la_LIBADD = \
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@@ -1013,7 +1014,8 @@ libsystemd_core_la_LIBADD = \
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 	$(PAM_LIBS) \
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 	$(AUDIT_LIBS) \
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 	$(CAP_LIBS) \
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-	$(KMOD_LIBS)
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+	$(KMOD_LIBS) \
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+	$(MOUNT_LIBS)
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 src/core/load-fragment-gperf-nulstr.c: src/core/load-fragment-gperf.gperf
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 	$(AM_V_at)$(MKDIR_P) $(dir $@)
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diff --git a/README b/README
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index b39cd37..42487dd 100644
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--- a/README
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+++ b/README
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@@ -94,6 +94,7 @@ REQUIREMENTS:
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         dbus >= 1.4.0
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         libcap
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+        libmount >= 2.20 (from util-linux)
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         libblkid >= 2.20 (from util-linux) (optional)
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         libkmod >= 14 (optional)
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         PAM >= 1.1.2 (optional)
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diff --git a/configure.ac b/configure.ac
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index 4f26092..b7dfc5f 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -292,6 +292,15 @@ fi
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 AM_CONDITIONAL(HAVE_BLKID, [test "$have_blkid" = "yes"])
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 # ------------------------------------------------------------------------------
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+have_libmount=no
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+PKG_CHECK_MODULES(MOUNT, [ mount >= 2.20 ],
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+        [AC_DEFINE(HAVE_LIBMOUNT, 1, [Define if libmount is available]) have_libmount=yes], have_libmount=no)
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+if test "x$have_libmount" = xno; then
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+        AC_MSG_ERROR([*** libmount support required but libraries not found])
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+fi
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+AM_CONDITIONAL(HAVE_LIBMOUNT, [test "$have_libmount" = "yes"])
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+
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+# ------------------------------------------------------------------------------
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 have_ima=yes
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 AC_ARG_ENABLE([ima], AS_HELP_STRING([--disable-ima],[Disable optional IMA support]),
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                 [case "${enableval}" in
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@@ -1046,6 +1055,7 @@ AC_MSG_RESULT([
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         efi:                     ${have_efi}
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         kmod:                    ${have_kmod}
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         blkid:                   ${have_blkid}
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+        libmount:                ${have_libmount}
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         nss-myhostname:          ${have_myhostname}
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         gudev:                   ${enable_gudev}
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         gintrospection:          ${enable_introspection}
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diff --git a/src/core/mount.c b/src/core/mount.c
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index bbceb92..d78269c 100644
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--- a/src/core/mount.c
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+++ b/src/core/mount.c
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@@ -24,6 +24,7 @@
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 #include <mntent.h>
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 #include <sys/epoll.h>
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 #include <signal.h>
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+#include <libmount.h>
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 #include "manager.h"
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 #include "unit.h"
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@@ -1563,55 +1564,47 @@ fail:
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         return r;
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 }
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+static inline void mnt_free_table_p(struct libmnt_table **tb) {
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+        mnt_free_table(*tb);
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+}
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+
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+static inline void mnt_free_iter_p(struct libmnt_iter **itr) {
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+        mnt_free_iter(*itr);
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+}
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+
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 static int mount_load_proc_self_mountinfo(Manager *m, bool set_flags) {
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+        _cleanup_(mnt_free_table_p) struct libmnt_table *tb = NULL;
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+        _cleanup_(mnt_free_iter_p) struct libmnt_iter *itr = NULL;
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+        struct libmnt_fs *fs;
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         int r = 0;
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-        unsigned i;
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         assert(m);
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-        rewind(m->proc_self_mountinfo);
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+        tb = mnt_new_table();
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+        itr = mnt_new_iter(MNT_ITER_FORWARD);
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+        if (!tb || !itr)
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+                return log_oom();
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-        for (i = 1;; i++) {
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-                _cleanup_free_ char *device = NULL, *path = NULL, *options = NULL, *options2 = NULL, *fstype = NULL, *d = NULL, *p = NULL, *o = NULL;
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-                int k;
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+        mnt_table_parse_mtab(tb, NULL);
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+        if (r)
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+                return r;
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-                k = fscanf(m->proc_self_mountinfo,
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-                           "%*s "       /* (1) mount id */
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-                           "%*s "       /* (2) parent id */
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-                           "%*s "       /* (3) major:minor */
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-                           "%*s "       /* (4) root */
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-                           "%ms "       /* (5) mount point */
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-                           "%ms"        /* (6) mount options */
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-                           "%*[^-]"     /* (7) optional fields */
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-                           "- "         /* (8) separator */
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-                           "%ms "       /* (9) file system type */
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-                           "%ms"        /* (10) mount source */
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-                           "%ms"        /* (11) mount options 2 */
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-                           "%*[^\n]",   /* some rubbish at the end */
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-                           &path,
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-                           &options,
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-                           &fstype,
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-                           &device,
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-                           &options2);
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-
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-                if (k == EOF)
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-                        break;
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-
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-                if (k != 5) {
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-                        log_warning("Failed to parse /proc/self/mountinfo:%u.", i);
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-                        continue;
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-                }
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+        while (mnt_table_next_fs(tb, itr, &fs) == 0) {
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+                const char *device, *path, *options, *fstype;
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+                _cleanup_free_ const char *d = NULL, *p = NULL;
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+                int k;
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-                o = strjoin(options, ",", options2, NULL);
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-                if (!o)
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-                        return log_oom();
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+                device = mnt_fs_get_source(fs);
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+                path = mnt_fs_get_target(fs);
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+                options = mnt_fs_get_options(fs);
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+                fstype = mnt_fs_get_fstype(fs);
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                 d = cunescape(device);
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                 p = cunescape(path);
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                 if (!d || !p)
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                         return log_oom();
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-                k = mount_add_one(m, d, p, o, fstype, 0, set_flags);
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+                k = mount_add_one(m, d, p, options, fstype, 0, set_flags);
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                 if (k < 0)
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                         r = k;
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         }
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@@ -1632,6 +1625,8 @@ static int mount_enumerate(Manager *m) {
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         int r;
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         assert(m);
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+        mnt_init_debug(0);
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+
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         if (!m->proc_self_mountinfo) {
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                 struct epoll_event ev = {
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                         .events = EPOLLPRI,