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Merge pull request #22202 from mwilck/keep-links-02
udevadm info --cleanup-db: don't delete information for kept db entries
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commit
ac16a593cf
@ -232,12 +232,14 @@ static void cleanup_dir(DIR *dir, mode_t mask, int depth) {
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if (depth <= 0)
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return;
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assert(dir);
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FOREACH_DIRENT_ALL(dent, dir, break) {
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struct stat stats;
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if (dent->d_name[0] == '.')
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if (dot_or_dot_dot(dent->d_name))
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continue;
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if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) != 0)
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if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) < 0)
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continue;
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if ((stats.st_mode & mask) != 0)
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continue;
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@ -254,6 +256,62 @@ static void cleanup_dir(DIR *dir, mode_t mask, int depth) {
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}
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}
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/*
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* Assume that dir is a directory with file names matching udev data base
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* entries for devices in /run/udev/data (such as "b8:16"), and removes
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* all files except those that haven't been deleted in /run/udev/data
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* (i.e. they were skipped during db cleanup because of the db_persist flag).
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* Returns true if the directory is empty after cleanup.
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*/
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static bool cleanup_dir_after_db_cleanup(DIR *dir, DIR *datadir) {
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unsigned int kept = 0;
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assert(dir && datadir);
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FOREACH_DIRENT_ALL(dent, dir, break) {
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struct stat data_stats, link_stats;
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if (dot_or_dot_dot(dent->d_name))
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continue;
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if (fstatat(dirfd(dir), dent->d_name, &link_stats, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno != ENOENT)
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kept++;
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continue;
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}
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if (fstatat(dirfd(datadir), dent->d_name, &data_stats, 0) < 0)
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(void) unlinkat(dirfd(dir), dent->d_name,
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S_ISDIR(link_stats.st_mode) ? AT_REMOVEDIR : 0);
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else
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/* The entry still exists under /run/udev/data */
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kept++;
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}
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return kept == 0;
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}
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static void cleanup_dirs_after_db_cleanup(DIR *dir, DIR *datadir) {
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assert(dir && datadir);
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FOREACH_DIRENT_ALL(dent, dir, break) {
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struct stat stats;
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if (dot_or_dot_dot(dent->d_name))
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continue;
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if (fstatat(dirfd(dir), dent->d_name, &stats, AT_SYMLINK_NOFOLLOW) < 0)
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continue;
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if (S_ISDIR(stats.st_mode)) {
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_cleanup_closedir_ DIR *dir2 = NULL;
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dir2 = fdopendir(openat(dirfd(dir), dent->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC));
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if (dir2 && cleanup_dir_after_db_cleanup(dir2, datadir))
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(void) unlinkat(dirfd(dir), dent->d_name, AT_REMOVEDIR);
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} else
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(void) unlinkat(dirfd(dir), dent->d_name, 0);
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}
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}
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static void cleanup_db(void) {
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_cleanup_closedir_ DIR *dir1 = NULL, *dir2 = NULL, *dir3 = NULL, *dir4 = NULL, *dir5 = NULL;
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@ -263,11 +321,11 @@ static void cleanup_db(void) {
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dir2 = opendir("/run/udev/links");
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if (dir2)
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cleanup_dir(dir2, 0, 2);
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cleanup_dirs_after_db_cleanup(dir2, dir1);
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dir3 = opendir("/run/udev/tags");
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if (dir3)
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cleanup_dir(dir3, 0, 2);
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cleanup_dirs_after_db_cleanup(dir3, dir1);
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dir4 = opendir("/run/udev/static_node-tags");
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if (dir4)
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@ -275,7 +333,7 @@ static void cleanup_db(void) {
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dir5 = opendir("/run/udev/watch");
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if (dir5)
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cleanup_dir(dir5, 0, 1);
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cleanup_dir_after_db_cleanup(dir5, dir1);
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}
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static int query_device(QueryType query, sd_device* device) {
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