From 037b80886a6c3acad294aee139d28d1f574d82cc Mon Sep 17 00:00:00 2001
From: Goffredo Baroncelli <kreijack@inwind.it>
Date: Mon, 16 Mar 2015 20:33:50 +0100
Subject: [PATCH] Allow systemd-tmpfiles to set the file/directory attributes
Allow systemd-tmpfiles to set the file/directory attributes, like
chattr(1) does. Two more commands are added: 'H' and 'h' to set the
attributes, recursively and not.
(cherry picked from commit 22c3a6cadbc99ad623501db9a928f52f6f84c0c3)
Related: #1299714
---
src/tmpfiles/tmpfiles.c | 150 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 150 insertions(+)
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index ed35b8cf0d..c8c56c722d 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -40,6 +40,7 @@
#include <sys/types.h>
#include <sys/param.h>
#include <sys/xattr.h>
+#include <linux/fs.h>
#include "log.h"
#include "util.h"
@@ -91,6 +92,8 @@ typedef enum ItemType {
RELABEL_PATH = 'z',
RECURSIVE_RELABEL_PATH = 'Z',
ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
+ SET_ATTRIB = 'h',
+ RECURSIVE_SET_ATTRIB = 'H',
} ItemType;
typedef struct Item {
@@ -109,12 +112,15 @@ typedef struct Item {
usec_t age;
dev_t major_minor;
+ unsigned long attrib_value;
+ unsigned long attrib_mask;
bool uid_set:1;
bool gid_set:1;
bool mode_set:1;
bool age_set:1;
bool mask_perms:1;
+ bool attrib_set:1;
bool keep_first_level:1;
@@ -817,6 +823,127 @@ static int path_set_acls(Item *item, const char *path) {
return r;
}
+#define ALL_ATTRIBS \
+ FS_NOATIME_FL | \
+ FS_SYNC_FL | \
+ FS_DIRSYNC_FL | \
+ FS_APPEND_FL | \
+ FS_COMPR_FL | \
+ FS_NODUMP_FL | \
+ FS_EXTENT_FL | \
+ FS_IMMUTABLE_FL | \
+ FS_JOURNAL_DATA_FL | \
+ FS_SECRM_FL | \
+ FS_UNRM_FL | \
+ FS_NOTAIL_FL | \
+ FS_TOPDIR_FL | \
+ FS_NOCOW_FL
+
+static int get_attrib_from_arg(Item *item) {
+ static const unsigned attributes[] = {
+ [(uint8_t)'A'] = FS_NOATIME_FL, /* do not update atime */
+ [(uint8_t)'S'] = FS_SYNC_FL, /* Synchronous updates */
+ [(uint8_t)'D'] = FS_DIRSYNC_FL, /* dirsync behaviour (directories only) */
+ [(uint8_t)'a'] = FS_APPEND_FL, /* writes to file may only append */
+ [(uint8_t)'c'] = FS_COMPR_FL, /* Compress file */
+ [(uint8_t)'d'] = FS_NODUMP_FL, /* do not dump file */
+ [(uint8_t)'e'] = FS_EXTENT_FL, /* Top of directory hierarchies*/
+ [(uint8_t)'i'] = FS_IMMUTABLE_FL, /* Immutable file */
+ [(uint8_t)'j'] = FS_JOURNAL_DATA_FL, /* Reserved for ext3 */
+ [(uint8_t)'s'] = FS_SECRM_FL, /* Secure deletion */
+ [(uint8_t)'u'] = FS_UNRM_FL, /* Undelete */
+ [(uint8_t)'t'] = FS_NOTAIL_FL, /* file tail should not be merged */
+ [(uint8_t)'T'] = FS_TOPDIR_FL, /* Top of directory hierarchies*/
+ [(uint8_t)'C'] = FS_NOCOW_FL, /* Do not cow file */
+ };
+ char *p = item->argument;
+ enum {
+ MODE_ADD,
+ MODE_DEL,
+ MODE_SET
+ } mode = MODE_ADD;
+ unsigned long value = 0, mask = 0;
+
+ if (!p) {
+ log_error("\"%s\": setting ATTR need an argument", item->path);
+ return -EINVAL;
+ }
+
+ if (*p == '+') {
+ mode = MODE_ADD;
+ p++;
+ } else if (*p == '-') {
+ mode = MODE_DEL;
+ p++;
+ } else if (*p == '=') {
+ mode = MODE_SET;
+ p++;
+ }
+
+ if (!*p && mode != MODE_SET) {
+ log_error("\"%s\": setting ATTR: argument is empty", item->path);
+ return -EINVAL;
+ }
+ for (; *p ; p++) {
+ if ((uint8_t)*p > ELEMENTSOF(attributes) || attributes[(uint8_t)*p] == 0) {
+ log_error("\"%s\": setting ATTR: unknown attr '%c'", item->path, *p);
+ return -EINVAL;
+ }
+ if (mode == MODE_ADD || mode == MODE_SET)
+ value |= attributes[(uint8_t)*p];
+ else
+ value &= ~attributes[(uint8_t)*p];
+ mask |= attributes[(uint8_t)*p];
+ }
+
+ if (mode == MODE_SET)
+ mask |= ALL_ATTRIBS;
+
+ assert(mask);
+
+ item->attrib_mask = mask;
+ item->attrib_value = value;
+ item->attrib_set = true;
+
+ return 0;
+
+}
+
+static int path_set_attrib(Item *item, const char *path) {
+ _cleanup_close_ int fd = -1;
+ int r;
+ unsigned f;
+ struct stat st;
+
+ /* do nothing */
+ if (item->attrib_mask == 0 || !item->attrib_set)
+ return 0;
+ /*
+ * It is OK to ignore an lstat() error, because the error
+ * will be catch by the open() below anyway
+ */
+ if (lstat(path, &st) == 0 &&
+ !S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode)) {
+ return 0;
+ }
+
+ fd = open(path, O_RDONLY|O_NONBLOCK|O_CLOEXEC);
+
+ if (fd < 0)
+ return log_error_errno(errno, "Cannot open \"%s\": %m", path);
+
+ f = item->attrib_value & item->attrib_mask;
+ if (!S_ISDIR(st.st_mode))
+ f &= ~FS_DIRSYNC_FL;
+ r = change_attr_fd(fd, f, item->attrib_mask);
+ if (r < 0)
+ return log_error_errno(errno,
+ "Cannot set attrib for \"%s\", value=0x%08lx, mask=0x%08lx: %m",
+ path, item->attrib_value, item->attrib_mask);
+
+ return 0;
+}
+
static int write_one_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
int flags, r = 0;
@@ -1266,6 +1393,18 @@ static int create_item(Item *i) {
if (r < 0)
return r;
break;
+
+ case SET_ATTRIB:
+ r = glob_item(i, path_set_attrib, false);
+ if (r < 0)
+ return r;
+ break;
+
+ case RECURSIVE_SET_ATTRIB:
+ r = glob_item(i, path_set_attrib, true);
+ if (r < 0)
+ return r;
+ break;
}
return 0;
@@ -1712,6 +1851,17 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
return r;
break;
+ case SET_ATTRIB:
+ case RECURSIVE_SET_ATTRIB:
+ if (!i.argument) {
+ log_error("[%s:%u] Set attrib requires argument.", fname, line);
+ return -EBADMSG;
+ }
+ r = get_attrib_from_arg(&i);
+ if (r < 0)
+ return r;
+ break;
+
default:
log_error("[%s:%u] Unknown command type '%c'.", fname, line, (char) i.type);
return -EBADMSG;