X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Ftmpfiles%2Ftmpfiles.c;h=614644a0abe59fadaf7bbf8eb378e6abf233f2ff;hp=6b3f70e071e17a10f9cc91a4da8688e1681e5a37;hb=d39efe744a050cf2231459262e04a87fb0da3d7f;hpb=fabe5c0e5fce730aa66e10a9c4f9fdd443d7aeda diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c index 6b3f70e07..614644a0a 100644 --- a/src/tmpfiles/tmpfiles.c +++ b/src/tmpfiles/tmpfiles.c @@ -43,6 +43,7 @@ #include "log.h" #include "util.h" #include "macro.h" +#include "missing.h" #include "mkdir.h" #include "path-util.h" #include "strv.h" @@ -134,7 +135,7 @@ static struct Item* find_glob(Hashmap *h, const char *match) { } static void load_unix_sockets(void) { - FILE *f = NULL; + FILE _cleanup_fclose_ *f = NULL; char line[LINE_MAX]; if (unix_sockets) @@ -194,15 +195,11 @@ static void load_unix_sockets(void) { } } - fclose(f); return; fail: set_free_free(unix_sockets); unix_sockets = NULL; - - if (f) - fclose(f); } static bool unix_socket_alive(const char *fn) { @@ -217,6 +214,42 @@ static bool unix_socket_alive(const char *fn) { return true; } +static int dir_is_mount_point(DIR *d, const char *subdir) { + struct file_handle *h; + int mount_id_parent, mount_id; + int r_p, r; + + h = alloca(MAX_HANDLE_SZ); + + h->handle_bytes = MAX_HANDLE_SZ; + r_p = name_to_handle_at(dirfd(d), ".", h, &mount_id_parent, 0); + if (r_p < 0) + r_p = -errno; + + h->handle_bytes = MAX_HANDLE_SZ; + r = name_to_handle_at(dirfd(d), subdir, h, &mount_id, 0); + if (r < 0) + r = -errno; + + /* got no handle; make no assumptions, return error */ + if (r_p < 0 && r < 0) + return r_p; + + /* got both handles; if they differ, it is a mount point */ + if (r_p >= 0 && r >= 0) + return mount_id_parent != mount_id; + + /* got only one handle; assume different mount points if one + * of both queries was not supported by the filesystem */ + if (r_p == -ENOSYS || r_p == -ENOTSUP || r == -ENOSYS || r == -ENOTSUP) + return true; + + /* return error */ + if (r_p < 0) + return r_p; + return r; +} + static int dir_cleanup( Item *i, const char *p, @@ -231,12 +264,12 @@ static int dir_cleanup( struct dirent *dent; struct timespec times[2]; bool deleted = false; - char *sub_path = NULL; int r = 0; while ((dent = readdir(d))) { struct stat s; usec_t age; + char _cleanup_free_ *sub_path = NULL; if (streq(dent->d_name, ".") || streq(dent->d_name, "..")) @@ -256,13 +289,16 @@ static int dir_cleanup( if (s.st_dev != rootdev) continue; + /* Try to detect bind mounts of the same filesystem instance; they + * do not differ in device major/minors. This type of query is not + * supported on all kernels or filesystem types though. */ + if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0) + continue; + /* Do not delete read-only files owned by root */ if (s.st_uid == 0 && !(s.st_mode & S_IWUSR)) continue; - free(sub_path); - sub_path = NULL; - if (asprintf(&sub_path, "%s/%s", p, dent->d_name) < 0) { r = log_oom(); goto finish; @@ -285,7 +321,7 @@ static int dir_cleanup( if (maxdepth <= 0) log_warning("Reached max depth on %s.", sub_path); else { - DIR *sub_dir; + DIR _cleanup_closedir_ *sub_dir; int q; sub_dir = xopendirat(dirfd(d), dent->d_name, O_NOFOLLOW|O_NOATIME); @@ -299,7 +335,6 @@ static int dir_cleanup( } q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false); - closedir(sub_dir); if (q < 0) r = q; @@ -321,7 +356,7 @@ static int dir_cleanup( if (age >= cutoff) continue; - if (!i->type == IGNORE_DIRECTORY_PATH || !streq(dent->d_name, p)) { + if (i->type != IGNORE_DIRECTORY_PATH || !streq(dent->d_name, p)) { log_debug("rmdir '%s'\n", sub_path); if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0) { @@ -393,8 +428,6 @@ finish: log_error("utimensat(%s): %m", p); } - free(sub_path); - return r; } @@ -483,7 +516,7 @@ static int write_one_file(Item *i, const char *path) { } static int recursive_relabel_children(Item *i, const char *path) { - DIR *d; + DIR _cleanup_closedir_ *d; int ret = 0; /* This returns the first error we run into, but nevertheless @@ -498,7 +531,7 @@ static int recursive_relabel_children(Item *i, const char *path) { union dirent_storage buf; bool is_dir; int r; - char *entry_path; + char _cleanup_free_ *entry_path = NULL; r = readdir_r(d, &buf.de, &de); if (r != 0) { @@ -525,7 +558,6 @@ static int recursive_relabel_children(Item *i, const char *path) { if (lstat(entry_path, &st) < 0) { if (ret == 0 && errno != ENOENT) ret = -errno; - free(entry_path); continue; } @@ -538,7 +570,6 @@ static int recursive_relabel_children(Item *i, const char *path) { if (r < 0) { if (ret == 0 && r != -ENOENT) ret = r; - free(entry_path); continue; } @@ -547,12 +578,8 @@ static int recursive_relabel_children(Item *i, const char *path) { if (r < 0 && ret == 0) ret = r; } - - free(entry_path); } - closedir(d); - return ret; } @@ -856,7 +883,7 @@ static int remove_item(Item *i) { } static int clean_item_instance(Item *i, const char* instance) { - DIR *d; + DIR _cleanup_closedir_ *d = NULL; struct stat s, ps; bool mountpoint; int r; @@ -884,31 +911,24 @@ static int clean_item_instance(Item *i, const char* instance) { if (fstat(dirfd(d), &s) < 0) { log_error("stat(%s) failed: %m", i->path); - r = -errno; - goto finish; + return -errno; } if (!S_ISDIR(s.st_mode)) { log_error("%s is not a directory.", i->path); - r = -ENOTDIR; - goto finish; + return -ENOTDIR; } if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0) { log_error("stat(%s/..) failed: %m", i->path); - r = -errno; - goto finish; + return -errno; } mountpoint = s.st_dev != ps.st_dev || (s.st_dev == ps.st_dev && s.st_ino == ps.st_ino); - r = dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint, MAX_DEPTH, i->keep_first_level); - -finish: - if (d) - closedir(d); - + r = dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint, + MAX_DEPTH, i->keep_first_level); return r; } @@ -1002,7 +1022,8 @@ static bool item_equal(Item *a, Item *b) { static int parse_line(const char *fname, unsigned line, const char *buffer) { Item *i, *existing; - char *mode = NULL, *user = NULL, *group = NULL, *age = NULL; + char _cleanup_free_ + *mode = NULL, *user = NULL, *group = NULL, *age = NULL; char type; Hashmap *h; int r, n = -1; @@ -1015,21 +1036,16 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) { if (!i) return log_oom(); - if (sscanf(buffer, - "%c " - "%ms " - "%ms " - "%ms " - "%ms " - "%ms " - "%n", + r = sscanf(buffer, + "%c %ms %ms %ms %ms %ms %n", &type, &i->path, &mode, &user, &group, &age, - &n) < 2) { + &n); + if (r < 2) { log_error("[%s:%u] Syntax error.", fname, line); r = -EIO; goto finish; @@ -1196,11 +1212,6 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) { r = 0; finish: - free(user); - free(group); - free(mode); - free(age); - if (i) item_free(i);