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Systemd/src/tmpfiles/tmpfiles.c

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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering, Kay Sievers
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <limits.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <getopt.h>
#include <stdbool.h>
#include <time.h>
#include <sys/types.h>
#include <sys/param.h>
#include <glob.h>
#include <fnmatch.h>
#include <sys/capability.h>
#include "log.h"
#include "util.h"
#include "macro.h"
#include "missing.h"
#include "mkdir.h"
#include "path-util.h"
#include "strv.h"
#include "label.h"
#include "set.h"
#include "conf-files.h"
#include "capability.h"
#include "specifier.h"
#include "build.h"
#include "copy.h"
/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
* them in the file system. This is intended to be used to create
* properly owned directories beneath /tmp, /var/tmp, /run, which are
* volatile and hence need to be recreated on bootup. */
typedef enum ItemType {
/* These ones take file names */
CREATE_FILE = 'f',
TRUNCATE_FILE = 'F',
CREATE_DIRECTORY = 'd',
TRUNCATE_DIRECTORY = 'D',
CREATE_FIFO = 'p',
CREATE_SYMLINK = 'L',
CREATE_CHAR_DEVICE = 'c',
CREATE_BLOCK_DEVICE = 'b',
COPY_FILES = 'C',
/* These ones take globs */
WRITE_FILE = 'w',
IGNORE_PATH = 'x',
IGNORE_DIRECTORY_PATH = 'X',
REMOVE_PATH = 'r',
RECURSIVE_REMOVE_PATH = 'R',
ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
RELABEL_PATH = 'z',
RECURSIVE_RELABEL_PATH = 'Z',
} ItemType;
typedef struct Item {
ItemType type;
char *path;
char *argument;
uid_t uid;
gid_t gid;
mode_t mode;
usec_t age;
dev_t major_minor;
bool uid_set:1;
bool gid_set:1;
bool mode_set:1;
bool age_set:1;
bool mask_perms:1;
bool keep_first_level:1;
bool force:1;
bool done:1;
} Item;
static bool arg_create = false;
static bool arg_clean = false;
static bool arg_remove = false;
static bool arg_boot = false;
static char **arg_include_prefixes = NULL;
static char **arg_exclude_prefixes = NULL;
static char *arg_root = NULL;
static const char conf_file_dirs[] =
"/etc/tmpfiles.d\0"
"/run/tmpfiles.d\0"
"/usr/local/lib/tmpfiles.d\0"
"/usr/lib/tmpfiles.d\0"
#ifdef HAVE_SPLIT_USR
"/lib/tmpfiles.d\0"
#endif
;
#define MAX_DEPTH 256
static Hashmap *items = NULL, *globs = NULL;
static Set *unix_sockets = NULL;
static bool needs_glob(ItemType t) {
return IN_SET(t,
WRITE_FILE,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH,
ADJUST_MODE,
RELABEL_PATH,
RECURSIVE_RELABEL_PATH);
}
static struct Item* find_glob(Hashmap *h, const char *match) {
Item *j;
Iterator i;
HASHMAP_FOREACH(j, h, i)
if (fnmatch(j->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
return j;
return NULL;
}
static void load_unix_sockets(void) {
_cleanup_fclose_ FILE *f = NULL;
char line[LINE_MAX];
if (unix_sockets)
return;
/* We maintain a cache of the sockets we found in
* /proc/net/unix to speed things up a little. */
unix_sockets = set_new(&string_hash_ops);
if (!unix_sockets)
return;
f = fopen("/proc/net/unix", "re");
if (!f)
return;
/* Skip header */
if (!fgets(line, sizeof(line), f))
goto fail;
for (;;) {
char *p, *s;
int k;
if (!fgets(line, sizeof(line), f))
break;
truncate_nl(line);
p = strchr(line, ':');
if (!p)
continue;
if (strlen(p) < 37)
continue;
p += 37;
p += strspn(p, WHITESPACE);
p += strcspn(p, WHITESPACE); /* skip one more word */
p += strspn(p, WHITESPACE);
if (*p != '/')
continue;
s = strdup(p);
if (!s)
goto fail;
path_kill_slashes(s);
k = set_consume(unix_sockets, s);
if (k < 0 && k != -EEXIST)
goto fail;
}
return;
fail:
set_free_free(unix_sockets);
unix_sockets = NULL;
}
static bool unix_socket_alive(const char *fn) {
assert(fn);
load_unix_sockets();
if (unix_sockets)
return !!set_get(unix_sockets, (char*) fn);
/* We don't know, so assume yes */
return true;
}
static int dir_is_mount_point(DIR *d, const char *subdir) {
union file_handle_union h = {
.handle.handle_bytes = MAX_HANDLE_SZ
};
int mount_id_parent, mount_id;
int r_p, r;
r_p = name_to_handle_at(dirfd(d), ".", &h.handle, &mount_id_parent, 0);
if (r_p < 0)
r_p = -errno;
h.handle.handle_bytes = MAX_HANDLE_SZ;
r = name_to_handle_at(dirfd(d), subdir, &h.handle, &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,
DIR *d,
const struct stat *ds,
usec_t cutoff,
dev_t rootdev,
bool mountpoint,
int maxdepth,
bool keep_this_level) {
struct dirent *dent;
struct timespec times[2];
bool deleted = false;
int r = 0;
while ((dent = readdir(d))) {
struct stat s;
usec_t age;
_cleanup_free_ char *sub_path = NULL;
if (streq(dent->d_name, ".") ||
streq(dent->d_name, ".."))
continue;
if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
if (errno == ENOENT)
continue;
/* FUSE, NFS mounts, SELinux might return EACCES */
if (errno == EACCES)
log_debug("stat(%s/%s) failed: %m", p, dent->d_name);
else
log_error("stat(%s/%s) failed: %m", p, dent->d_name);
r = -errno;
continue;
}
/* Stay on the same filesystem */
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;
sub_path = strjoin(p, "/", dent->d_name, NULL);
if (!sub_path) {
r = log_oom();
goto finish;
}
/* Is there an item configured for this path? */
if (hashmap_get(items, sub_path))
continue;
if (find_glob(globs, sub_path))
continue;
if (S_ISDIR(s.st_mode)) {
if (mountpoint &&
streq(dent->d_name, "lost+found") &&
s.st_uid == 0)
continue;
if (maxdepth <= 0)
log_warning("Reached max depth on %s.", sub_path);
else {
_cleanup_closedir_ DIR *sub_dir;
int q;
sub_dir = xopendirat(dirfd(d), dent->d_name, O_NOFOLLOW|O_NOATIME);
if (!sub_dir) {
if (errno != ENOENT) {
log_error("opendir(%s/%s) failed: %m", p, dent->d_name);
r = -errno;
}
continue;
}
q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);
if (q < 0)
r = q;
}
/* Note: if you are wondering why we don't
* support the sticky bit for excluding
* directories from cleaning like we do it for
* other file system objects: well, the sticky
* bit already has a meaning for directories,
* so we don't want to overload that. */
if (keep_this_level)
continue;
/* Ignore ctime, we change it when deleting */
age = MAX(timespec_load(&s.st_mtim),
timespec_load(&s.st_atim));
if (age >= cutoff)
continue;
if (i->type != IGNORE_DIRECTORY_PATH || !streq(dent->d_name, p)) {
log_debug("rmdir '%s'", sub_path);
if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0) {
if (errno != ENOENT && errno != ENOTEMPTY) {
log_error("rmdir(%s): %m", sub_path);
r = -errno;
}
}
}
} else {
/* Skip files for which the sticky bit is
* set. These are semantics we define, and are
* unknown elsewhere. See XDG_RUNTIME_DIR
* specification for details. */
if (s.st_mode & S_ISVTX)
continue;
if (mountpoint && S_ISREG(s.st_mode)) {
if (streq(dent->d_name, ".journal") &&
s.st_uid == 0)
continue;
if (streq(dent->d_name, "aquota.user") ||
streq(dent->d_name, "aquota.group"))
continue;
}
/* Ignore sockets that are listed in /proc/net/unix */
if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path))
continue;
/* Ignore device nodes */
if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode))
continue;
/* Keep files on this level around if this is
* requested */
if (keep_this_level)
continue;
age = MAX3(timespec_load(&s.st_mtim),
timespec_load(&s.st_atim),
timespec_load(&s.st_ctim));
if (age >= cutoff)
continue;
log_debug("unlink '%s'", sub_path);
if (unlinkat(dirfd(d), dent->d_name, 0) < 0) {
if (errno != ENOENT) {
log_error("unlink(%s): %m", sub_path);
r = -errno;
}
}
deleted = true;
}
}
finish:
if (deleted) {
/* Restore original directory timestamps */
times[0] = ds->st_atim;
times[1] = ds->st_mtim;
if (futimens(dirfd(d), times) < 0)
log_error("utimensat(%s): %m", p);
}
return r;
}
static int item_set_perms(Item *i, const char *path) {
struct stat st;
bool st_valid;
assert(i);
assert(path);
st_valid = stat(path, &st) == 0;
/* not using i->path directly because it may be a glob */
if (i->mode_set) {
mode_t m = i->mode;
if (i->mask_perms && st_valid) {
if (!(st.st_mode & 0111))
m &= ~0111;
if (!(st.st_mode & 0222))
m &= ~0222;
if (!(st.st_mode & 0444))
m &= ~0444;
if (!S_ISDIR(st.st_mode))
m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
}
if (!st_valid || m != (st.st_mode & 07777)) {
if (chmod(path, m) < 0) {
log_error("chmod(%s) failed: %m", path);
return -errno;
}
}
}
if ((!st_valid || (i->uid != st.st_uid || i->gid != st.st_gid)) &&
(i->uid_set || i->gid_set))
if (chown(path,
i->uid_set ? i->uid : (uid_t) -1,
i->gid_set ? i->gid : (gid_t) -1) < 0) {
log_error("chown(%s) failed: %m", path);
return -errno;
}
return label_fix(path, false, false);
}
static int write_one_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
int flags, r = 0;
struct stat st;
assert(i);
assert(path);
flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND|O_NOFOLLOW :
i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC|O_NOFOLLOW : 0;
RUN_WITH_UMASK(0000) {
label_context_set(path, S_IFREG);
fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
label_context_clear();
}
if (fd < 0) {
if (i->type == WRITE_FILE && errno == ENOENT)
return 0;
log_error("Failed to create file %s: %m", path);
return -errno;
}
if (i->argument) {
_cleanup_free_ char *unescaped;
ssize_t n;
size_t l;
unescaped = cunescape(i->argument);
if (!unescaped)
return log_oom();
l = strlen(unescaped);
n = write(fd, unescaped, l);
if (n < 0 || (size_t) n < l) {
log_error("Failed to write file %s: %s", path, n < 0 ? strerror(-n) : "Short write");
return n < 0 ? n : -EIO;
}
}
fd = safe_close(fd);
if (stat(path, &st) < 0) {
log_error("stat(%s) failed: %m", path);
return -errno;
}
if (!S_ISREG(st.st_mode)) {
log_error("%s is not a file.", path);
return -EEXIST;
}
r = item_set_perms(i, path);
if (r < 0)
return r;
return 0;
}
static int item_set_perms_children(Item *i, const char *path) {
_cleanup_closedir_ DIR *d;
int r = 0;
assert(i);
assert(path);
/* This returns the first error we run into, but nevertheless
* tries to go on */
d = opendir(path);
if (!d)
return errno == ENOENT || errno == ENOTDIR ? 0 : -errno;
for (;;) {
_cleanup_free_ char *p = NULL;
struct dirent *de;
int q;
errno = 0;
de = readdir(d);
if (!de) {
if (errno != 0 && r == 0)
r = -errno;
break;
}
if (streq(de->d_name, ".") || streq(de->d_name, ".."))
continue;
p = strjoin(path, "/", de->d_name, NULL);
if (!p)
return -ENOMEM;
q = item_set_perms(i, p);
if (q < 0 && q != -ENOENT && r == 0)
r = q;
if (IN_SET(de->d_type, DT_UNKNOWN, DT_DIR)) {
q = item_set_perms_children(i, p);
if (q < 0 && r == 0)
r = q;
}
}
return r;
}
static int item_set_perms_recursive(Item *i, const char *path) {
int r, q;
assert(i);
assert(path);
r = item_set_perms(i, path);
if (r < 0)
return r;
q = item_set_perms_children(i, path);
if (q < 0 && r == 0)
r = q;
return r;
}
static int glob_item(Item *i, int (*action)(Item *, const char *)) {
_cleanup_globfree_ glob_t g = {};
int r = 0, k;
char **fn;
errno = 0;
k = glob(i->path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
if (k != 0 && k != GLOB_NOMATCH) {
if (errno == 0)
errno = EIO;
log_error("glob(%s) failed: %m", i->path);
return -errno;
}
STRV_FOREACH(fn, g.gl_pathv) {
k = action(i, *fn);
if (k < 0 && r == 0)
r = k;
}
return r;
}
static int create_item(Item *i) {
struct stat st;
int r = 0;
assert(i);
switch (i->type) {
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
return 0;
case CREATE_FILE:
case TRUNCATE_FILE:
r = write_one_file(i, i->path);
if (r < 0)
return r;
break;
case COPY_FILES:
r = copy_tree(i->argument, i->path, false);
if (r < 0) {
struct stat a, b;
if (r != -EEXIST) {
log_error("Failed to copy files to %s: %s", i->path, strerror(-r));
return -r;
}
if (stat(i->argument, &a) < 0) {
log_error("stat(%s) failed: %m", i->argument);
return -errno;
}
if (stat(i->path, &b) < 0) {
log_error("stat(%s) failed: %m", i->path);
return -errno;
}
if ((a.st_mode ^ b.st_mode) & S_IFMT) {
log_debug("Can't copy to %s, file exists already and is of different type", i->path);
return 0;
}
}
r = item_set_perms(i, i->path);
if (r < 0)
return r;
break;
case WRITE_FILE:
r = glob_item(i, write_one_file);
if (r < 0)
return r;
break;
case TRUNCATE_DIRECTORY:
case CREATE_DIRECTORY:
RUN_WITH_UMASK(0000) {
mkdir_parents_label(i->path, 0755);
r = mkdir_label(i->path, i->mode);
}
if (r < 0) {
if (r != -EEXIST) {
log_error("Failed to create directory %s: %s", i->path, strerror(-r));
return r;
}
if (stat(i->path, &st) < 0) {
log_error("stat(%s) failed: %m", i->path);
return -errno;
}
if (!S_ISDIR(st.st_mode)) {
log_debug("%s already exists and is not a directory.", i->path);
return 0;
}
}
r = item_set_perms(i, i->path);
if (r < 0)
return r;
break;
case CREATE_FIFO:
RUN_WITH_UMASK(0000) {
label_context_set(i->path, S_IFIFO);
r = mkfifo(i->path, i->mode);
label_context_clear();
}
if (r < 0) {
if (errno != EEXIST) {
log_error("Failed to create fifo %s: %m", i->path);
return -errno;
}
if (stat(i->path, &st) < 0) {
log_error("stat(%s) failed: %m", i->path);
return -errno;
}
if (!S_ISFIFO(st.st_mode)) {
if (i->force) {
RUN_WITH_UMASK(0000) {
label_context_set(i->path, S_IFIFO);
r = mkfifo_atomic(i->path, i->mode);
label_context_clear();
}
if (r < 0) {
log_error("Failed to create fifo %s: %s", i->path, strerror(-r));
return r;
}
} else {
log_debug("%s is not a fifo.", i->path);
return 0;
}
}
}
r = item_set_perms(i, i->path);
if (r < 0)
return r;
break;
case CREATE_SYMLINK:
label_context_set(i->path, S_IFLNK);
r = symlink(i->argument, i->path);
label_context_clear();
if (r < 0) {
_cleanup_free_ char *x = NULL;
if (errno != EEXIST) {
log_error("symlink(%s, %s) failed: %m", i->argument, i->path);
return -errno;
}
r = readlink_malloc(i->path, &x);
if (r < 0 || !streq(i->argument, x)) {
if (i->force) {
label_context_set(i->path, S_IFLNK);
r = symlink_atomic(i->argument, i->path);
label_context_clear();
if (r < 0) {
log_error("symlink(%s, %s) failed: %s", i->argument, i->path, strerror(-r));
return r;
}
} else {
log_debug("%s is not a symlink or does not point to the correct path.", i->path);
return 0;
}
}
}
break;
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE: {
mode_t file_type;
if (have_effective_cap(CAP_MKNOD) == 0) {
/* In a container we lack CAP_MKNOD. We
shouldn't attempt to create the device node in
that case to avoid noise, and we don't support
virtualized devices in containers anyway. */
log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
return 0;
}
file_type = i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR;
RUN_WITH_UMASK(0000) {
label_context_set(i->path, file_type);
r = mknod(i->path, i->mode | file_type, i->major_minor);
label_context_clear();
}
if (r < 0) {
if (errno == EPERM) {
log_debug("We lack permissions, possibly because of cgroup configuration; "
"skipping creation of device node %s.", i->path);
return 0;
}
if (errno != EEXIST) {
log_error("Failed to create device node %s: %m", i->path);
return -errno;
}
if (stat(i->path, &st) < 0) {
log_error("stat(%s) failed: %m", i->path);
return -errno;
}
if ((st.st_mode & S_IFMT) != file_type) {
if (i->force) {
RUN_WITH_UMASK(0000) {
label_context_set(i->path, file_type);
r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
label_context_clear();
}
if (r < 0) {
log_error("Failed to create device node %s: %s", i->path, strerror(-r));
return r;
}
} else {
log_debug("%s is not a device node.", i->path);
return 0;
}
}
}
r = item_set_perms(i, i->path);
if (r < 0)
return r;
break;
}
case ADJUST_MODE:
case RELABEL_PATH:
r = glob_item(i, item_set_perms);
if (r < 0)
return r;
break;
case RECURSIVE_RELABEL_PATH:
r = glob_item(i, item_set_perms_recursive);
if (r < 0)
return r;
break;
}
log_debug("%s created successfully.", i->path);
return 0;
}
static int remove_item_instance(Item *i, const char *instance) {
int r;
assert(i);
switch (i->type) {
case CREATE_FILE:
case TRUNCATE_FILE:
case CREATE_DIRECTORY:
case CREATE_FIFO:
case CREATE_SYMLINK:
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case ADJUST_MODE:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
case WRITE_FILE:
case COPY_FILES:
break;
case REMOVE_PATH:
if (remove(instance) < 0 && errno != ENOENT) {
log_error("remove(%s): %m", instance);
return -errno;
}
break;
case TRUNCATE_DIRECTORY:
case RECURSIVE_REMOVE_PATH:
/* FIXME: we probably should use dir_cleanup() here
* instead of rm_rf() so that 'x' is honoured. */
r = rm_rf_dangerous(instance, false, i->type == RECURSIVE_REMOVE_PATH, false);
if (r < 0 && r != -ENOENT) {
log_error("rm_rf(%s): %s", instance, strerror(-r));
return r;
}
break;
}
return 0;
}
static int remove_item(Item *i) {
int r = 0;
assert(i);
switch (i->type) {
case CREATE_FILE:
case TRUNCATE_FILE:
case CREATE_DIRECTORY:
case CREATE_FIFO:
case CREATE_SYMLINK:
case CREATE_CHAR_DEVICE:
case CREATE_BLOCK_DEVICE:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case ADJUST_MODE:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
case WRITE_FILE:
case COPY_FILES:
break;
case REMOVE_PATH:
case TRUNCATE_DIRECTORY:
case RECURSIVE_REMOVE_PATH:
r = glob_item(i, remove_item_instance);
break;
}
return r;
}
static int clean_item_instance(Item *i, const char* instance) {
_cleanup_closedir_ DIR *d = NULL;
struct stat s, ps;
bool mountpoint;
int r;
usec_t cutoff, n;
assert(i);
if (!i->age_set)
return 0;
n = now(CLOCK_REALTIME);
if (n < i->age)
return 0;
cutoff = n - i->age;
d = opendir(instance);
if (!d) {
if (errno == ENOENT || errno == ENOTDIR)
return 0;
log_error("Failed to open directory %s: %m", i->path);
return -errno;
}
if (fstat(dirfd(d), &s) < 0) {
log_error("stat(%s) failed: %m", i->path);
return -errno;
}
if (!S_ISDIR(s.st_mode)) {
log_error("%s is not a directory.", i->path);
return -ENOTDIR;
}
if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0) {
log_error("stat(%s/..) failed: %m", i->path);
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);
return r;
}
static int clean_item(Item *i) {
int r = 0;
assert(i);
switch (i->type) {
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
case IGNORE_PATH:
case COPY_FILES:
clean_item_instance(i, i->path);
break;
case IGNORE_DIRECTORY_PATH:
r = glob_item(i, clean_item_instance);
break;
default:
break;
}
return r;
}
static int process_item(Item *i) {
int r, q, p;
char prefix[PATH_MAX];
assert(i);
if (i->done)
return 0;
i->done = true;
PATH_FOREACH_PREFIX(prefix, i->path) {
Item *j;
j = hashmap_get(items, prefix);
if (j)
process_item(j);
}
r = arg_create ? create_item(i) : 0;
q = arg_remove ? remove_item(i) : 0;
p = arg_clean ? clean_item(i) : 0;
if (r < 0)
return r;
if (q < 0)
return q;
return p;
}
static void item_free(Item *i) {
if (!i)
return;
free(i->path);
free(i->argument);
free(i);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free);
static bool item_equal(Item *a, Item *b) {
assert(a);
assert(b);
if (!streq_ptr(a->path, b->path))
return false;
if (a->type != b->type)
return false;
if (a->uid_set != b->uid_set ||
(a->uid_set && a->uid != b->uid))
return false;
if (a->gid_set != b->gid_set ||
(a->gid_set && a->gid != b->gid))
return false;
if (a->mode_set != b->mode_set ||
(a->mode_set && a->mode != b->mode))
return false;
if (a->age_set != b->age_set ||
(a->age_set && a->age != b->age))
return false;
if ((a->type == CREATE_FILE ||
a->type == TRUNCATE_FILE ||
a->type == WRITE_FILE ||
a->type == CREATE_SYMLINK ||
a->type == COPY_FILES) &&
!streq_ptr(a->argument, b->argument))
return false;
if ((a->type == CREATE_CHAR_DEVICE ||
a->type == CREATE_BLOCK_DEVICE) &&
a->major_minor != b->major_minor)
return false;
return true;
}
static bool should_include_path(const char *path) {
char **prefix;
STRV_FOREACH(prefix, arg_exclude_prefixes)
if (path_startswith(path, *prefix))
return false;
STRV_FOREACH(prefix, arg_include_prefixes)
if (path_startswith(path, *prefix))
return true;
/* no matches, so we should include this path only if we
* have no whitelist at all */
return strv_length(arg_include_prefixes) == 0;
}
static int parse_line(const char *fname, unsigned line, const char *buffer) {
static const Specifier specifier_table[] = {
{ 'm', specifier_machine_id, NULL },
{ 'b', specifier_boot_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'v', specifier_kernel_release, NULL },
{}
};
_cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
_cleanup_(item_freep) Item *i = NULL;
Item *existing;
char type;
Hashmap *h;
int r, n = -1;
assert(fname);
assert(line >= 1);
assert(buffer);
r = sscanf(buffer,
"%ms %ms %ms %ms %ms %ms %n",
&action,
&path,
&mode,
&user,
&group,
&age,
&n);
if (r < 2) {
log_error("[%s:%u] Syntax error.", fname, line);
return -EIO;
}
if (isempty(action)) {
log_error("[%s:%u] Command too short '%s'.", fname, line, action);
return -EINVAL;
}
if (strlen(action) > 1 && !in_charset(action+1, "!+")) {
log_error("[%s:%u] Unknown modifiers in command '%s'", fname, line, action);
return -EINVAL;
}
if (strchr(action+1, '!') && !arg_boot)
return 0;
type = action[0];
i = new0(Item, 1);
if (!i)
return log_oom();
i->force = !!strchr(action+1, '+');
r = specifier_printf(path, specifier_table, NULL, &i->path);
if (r < 0) {
log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, path);
return r;
}
if (n >= 0) {
n += strspn(buffer+n, WHITESPACE);
if (buffer[n] != 0 && (buffer[n] != '-' || buffer[n+1] != 0)) {
i->argument = unquote(buffer+n, "\"");
if (!i->argument)
return log_oom();
}
}
switch (type) {
case CREATE_FILE:
case TRUNCATE_FILE:
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
case CREATE_FIFO:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
case ADJUST_MODE:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
break;
case CREATE_SYMLINK:
if (!i->argument) {
i->argument = strappend("/usr/share/factory", i->path);
if (!i->argument)
return log_oom();
}
break;
case WRITE_FILE:
if (!i->argument) {
log_error("[%s:%u] Write file requires argument.", fname, line);
return -EBADMSG;
}
break;
case COPY_FILES:
if (!i->argument) {
i->argument = strappend("/usr/share/factory", i->path);
if (!i->argument)
return log_oom();
}
if (!path_is_absolute(i->argument)) {
log_error("[%s:%u] Source path is not absolute.", fname, line);
return -EBADMSG;
}
path_kill_slashes(i->argument);
break;
case CREATE_CHAR_DEVICE:
case CREATE_BLOCK_DEVICE: {
unsigned major, minor;
if (!i->argument) {
log_error("[%s:%u] Device file requires argument.", fname, line);
return -EBADMSG;
}
if (sscanf(i->argument, "%u:%u", &major, &minor) != 2) {
log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i->argument);
return -EBADMSG;
}
i->major_minor = makedev(major, minor);
break;
}
default:
log_error("[%s:%u] Unknown command type '%c'.", fname, line, type);
return -EBADMSG;
}
i->type = type;
if (!path_is_absolute(i->path)) {
log_error("[%s:%u] Path '%s' not absolute.", fname, line, i->path);
return -EBADMSG;
}
path_kill_slashes(i->path);
if (!should_include_path(i->path))
return 0;
if (arg_root) {
char *p;
p = strappend(arg_root, i->path);
if (!p)
return log_oom();
free(i->path);
i->path = p;
}
if (user && !streq(user, "-")) {
const char *u = user;
r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);
if (r < 0) {
log_error("[%s:%u] Unknown user '%s'.", fname, line, user);
return r;
}
i->uid_set = true;
}
if (group && !streq(group, "-")) {
const char *g = group;
r = get_group_creds(&g, &i->gid);
if (r < 0) {
log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
return r;
}
i->gid_set = true;
}
if (mode && !streq(mode, "-")) {
const char *mm = mode;
unsigned m;
if (*mm == '~') {
i->mask_perms = true;
mm++;
}
if (sscanf(mm, "%o", &m) != 1) {
log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
return -ENOENT;
}
i->mode = m;
i->mode_set = true;
} else
i->mode =
i->type == CREATE_DIRECTORY ||
i->type == TRUNCATE_DIRECTORY ? 0755 : 0644;
if (age && !streq(age, "-")) {
const char *a = age;
if (*a == '~') {
i->keep_first_level = true;
a++;
}
if (parse_sec(a, &i->age) < 0) {
log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
return -EBADMSG;
}
i->age_set = true;
}
h = needs_glob(i->type) ? globs : items;
existing = hashmap_get(h, i->path);
if (existing) {
/* Two identical items are fine */
if (!item_equal(existing, i))
log_warning("Two or more conflicting lines for %s configured, ignoring.", i->path);
return 0;
}
r = hashmap_put(h, i->path, i);
if (r < 0) {
log_error("Failed to insert item %s: %s", i->path, strerror(-r));
return r;
}
i = NULL; /* avoid cleanup */
return 0;
}
static void help(void) {
printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
"Creates, deletes and cleans up volatile and temporary files and directories.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --create Create marked files/directories\n"
" --clean Clean up marked directories\n"
" --remove Remove marked files/directories\n"
" --boot Execute actions only safe at boot\n"
" --prefix=PATH Only apply rules that apply to paths with the specified prefix\n"
" --exclude-prefix=PATH Ignore rules that apply to paths with the specified prefix\n"
" --root=PATH Operate on an alternate filesystem root\n",
program_invocation_short_name);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_CREATE,
ARG_CLEAN,
ARG_REMOVE,
ARG_BOOT,
ARG_PREFIX,
ARG_EXCLUDE_PREFIX,
ARG_ROOT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "create", no_argument, NULL, ARG_CREATE },
{ "clean", no_argument, NULL, ARG_CLEAN },
{ "remove", no_argument, NULL, ARG_REMOVE },
{ "boot", no_argument, NULL, ARG_BOOT },
{ "prefix", required_argument, NULL, ARG_PREFIX },
{ "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
{ "root", required_argument, NULL, ARG_ROOT },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
puts(PACKAGE_STRING);
puts(SYSTEMD_FEATURES);
return 0;
case ARG_CREATE:
arg_create = true;
break;
case ARG_CLEAN:
arg_clean = true;
break;
case ARG_REMOVE:
arg_remove = true;
break;
case ARG_BOOT:
arg_boot = true;
break;
case ARG_PREFIX:
if (strv_push(&arg_include_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_EXCLUDE_PREFIX:
if (strv_push(&arg_exclude_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_ROOT:
free(arg_root);
arg_root = path_make_absolute_cwd(optarg);
if (!arg_root)
return log_oom();
path_kill_slashes(arg_root);
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (!arg_clean && !arg_create && !arg_remove) {
log_error("You need to specify at least one of --clean, --create or --remove.");
return -EINVAL;
}
return 1;
}
static int read_config_file(const char *fn, bool ignore_enoent) {
_cleanup_fclose_ FILE *f = NULL;
char line[LINE_MAX];
Iterator iterator;
unsigned v = 0;
Item *i;
int r;
assert(fn);
r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f);
if (r < 0) {
if (ignore_enoent && r == -ENOENT)
return 0;
log_error("Failed to open '%s', ignoring: %s", fn, strerror(-r));
return r;
}
FOREACH_LINE(line, f, break) {
char *l;
int k;
v++;
l = strstrip(line);
if (*l == '#' || *l == 0)
continue;
k = parse_line(fn, v, l);
if (k < 0 && r == 0)
r = k;
}
/* we have to determine age parameter for each entry of type X */
HASHMAP_FOREACH(i, globs, iterator) {
Iterator iter;
Item *j, *candidate_item = NULL;
if (i->type != IGNORE_DIRECTORY_PATH)
continue;
HASHMAP_FOREACH(j, items, iter) {
if (j->type != CREATE_DIRECTORY && j->type != TRUNCATE_DIRECTORY)
continue;
if (path_equal(j->path, i->path)) {
candidate_item = j;
break;
}
if ((!candidate_item && path_startswith(i->path, j->path)) ||
(candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))
candidate_item = j;
}
if (candidate_item) {
i->age = candidate_item->age;
i->age_set = true;
}
}
if (ferror(f)) {
log_error("Failed to read from file %s: %m", fn);
if (r == 0)
r = -EIO;
}
return r;
}
int main(int argc, char *argv[]) {
int r, k;
Item *i;
Iterator iterator;
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
label_init(NULL);
items = hashmap_new(&string_hash_ops);
globs = hashmap_new(&string_hash_ops);
if (!items || !globs) {
r = log_oom();
goto finish;
}
r = 0;
if (optind < argc) {
int j;
for (j = optind; j < argc; j++) {
k = read_config_file(argv[j], false);
if (k < 0 && r == 0)
r = k;
}
} else {
_cleanup_strv_free_ char **files = NULL;
char **f;
r = conf_files_list_nulstr(&files, ".conf", arg_root, conf_file_dirs);
if (r < 0) {
log_error("Failed to enumerate tmpfiles.d files: %s", strerror(-r));
goto finish;
}
STRV_FOREACH(f, files) {
k = read_config_file(*f, true);
if (k < 0 && r == 0)
r = k;
}
}
HASHMAP_FOREACH(i, globs, iterator)
process_item(i);
HASHMAP_FOREACH(i, items, iterator)
process_item(i);
finish:
while ((i = hashmap_steal_first(items)))
item_free(i);
while ((i = hashmap_steal_first(globs)))
item_free(i);
hashmap_free(items);
hashmap_free(globs);
free(arg_include_prefixes);
free(arg_exclude_prefixes);
free(arg_root);
set_free_free(unix_sockets);
label_finish();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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