/***
This file is part of systemd.
Copyright 2010 Lennart Poettering, Kay Sievers
Copyright 2015 Zbigniew Jędrzejewski-Szmek
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 .
***/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "acl-util.h"
#include "alloc-util.h"
#include "btrfs-util.h"
#include "capability-util.h"
#include "chattr-util.h"
#include "conf-files.h"
#include "copy.h"
#include "def.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "formats-util.h"
#include "fs-util.h"
#include "glob-util.h"
#include "io-util.h"
#include "label.h"
#include "log.h"
#include "macro.h"
#include "missing.h"
#include "mkdir.h"
#include "mount-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "rm-rf.h"
#include "selinux-util.h"
#include "set.h"
#include "specifier.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "umask-util.h"
#include "user-util.h"
#include "util.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_SUBVOLUME = 'v',
CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
CREATE_FIFO = 'p',
CREATE_SYMLINK = 'L',
CREATE_CHAR_DEVICE = 'c',
CREATE_BLOCK_DEVICE = 'b',
COPY_FILES = 'C',
/* These ones take globs */
WRITE_FILE = 'w',
SET_XATTR = 't',
RECURSIVE_SET_XATTR = 'T',
SET_ACL = 'a',
RECURSIVE_SET_ACL = 'A',
SET_ATTRIBUTE = 'h',
RECURSIVE_SET_ATTRIBUTE = 'H',
IGNORE_PATH = 'x',
IGNORE_DIRECTORY_PATH = 'X',
REMOVE_PATH = 'r',
RECURSIVE_REMOVE_PATH = 'R',
RELABEL_PATH = 'z',
RECURSIVE_RELABEL_PATH = 'Z',
ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
} ItemType;
typedef struct Item {
ItemType type;
char *path;
char *argument;
char **xattrs;
#ifdef HAVE_ACL
acl_t acl_access;
acl_t acl_default;
#endif
uid_t uid;
gid_t gid;
mode_t mode;
usec_t age;
dev_t major_minor;
unsigned attribute_value;
unsigned attribute_mask;
bool uid_set:1;
bool gid_set:1;
bool mode_set:1;
bool age_set:1;
bool mask_perms:1;
bool attribute_set:1;
bool keep_first_level:1;
bool force:1;
bool done:1;
} Item;
typedef struct ItemArray {
Item *items;
size_t count;
size_t size;
} ItemArray;
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[] = CONF_PATHS_NULSTR("tmpfiles.d");
#define MAX_DEPTH 256
static OrderedHashmap *items = NULL, *globs = NULL;
static Set *unix_sockets = NULL;
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 },
{}
};
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,
SET_XATTR,
RECURSIVE_SET_XATTR,
SET_ACL,
RECURSIVE_SET_ACL,
SET_ATTRIBUTE,
RECURSIVE_SET_ATTRIBUTE);
}
static bool takes_ownership(ItemType t) {
return IN_SET(t,
CREATE_FILE,
TRUNCATE_FILE,
CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA,
CREATE_FIFO,
CREATE_SYMLINK,
CREATE_CHAR_DEVICE,
CREATE_BLOCK_DEVICE,
COPY_FILES,
WRITE_FILE,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH);
}
static struct Item* find_glob(OrderedHashmap *h, const char *match) {
ItemArray *j;
Iterator i;
ORDERED_HASHMAP_FOREACH(j, h, i) {
unsigned n;
for (n = 0; n < j->count; n++) {
Item *item = j->items + n;
if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
return item;
}
}
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 = FILE_HANDLE_INIT;
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 == -EOPNOTSUPP || r == -ENOSYS || r == -EOPNOTSUPP)
return true;
/* return error */
if (r_p < 0)
return r_p;
return r;
}
static DIR* xopendirat_nomod(int dirfd, const char *path) {
DIR *dir;
dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
if (dir)
return dir;
log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
if (errno != EPERM)
return NULL;
dir = xopendirat(dirfd, path, O_NOFOLLOW);
if (!dir)
log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
return dir;
}
static DIR* opendir_nomod(const char *path) {
return xopendirat_nomod(AT_FDCWD, path);
}
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 (STR_IN_SET(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_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name);
else
log_error_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name);
r = -errno;
continue;
}
/* Stay on the same filesystem */
if (s.st_dev != rootdev) {
log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
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) {
log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.",
p, dent->d_name);
continue;
}
/* Do not delete read-only files owned by root */
if (s.st_uid == 0 && !(s.st_mode & S_IWUSR)) {
log_debug("Ignoring \"%s/%s\": read-only and owner by root.", p, dent->d_name);
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 (ordered_hashmap_get(items, sub_path)) {
log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
continue;
}
if (find_glob(globs, sub_path)) {
log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
continue;
}
if (S_ISDIR(s.st_mode)) {
if (mountpoint &&
streq(dent->d_name, "lost+found") &&
s.st_uid == 0) {
log_debug("Ignoring \"%s\".", sub_path);
continue;
}
if (maxdepth <= 0)
log_warning("Reached max depth on \"%s\".", sub_path);
else {
_cleanup_closedir_ DIR *sub_dir;
int q;
sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
if (!sub_dir) {
if (errno != ENOENT)
r = log_error_errno(errno, "opendir(%s) failed: %m", sub_path);
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) {
log_debug("Keeping \"%s\".", sub_path);
continue;
}
/* Ignore ctime, we change it when deleting */
age = timespec_load(&s.st_mtim);
if (age >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
/* Follows spelling in stat(1). */
log_debug("Directory \"%s\": modify time %s is too new.",
sub_path,
format_timestamp_us(a, sizeof(a), age));
continue;
}
age = timespec_load(&s.st_atim);
if (age >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("Directory \"%s\": access time %s is too new.",
sub_path,
format_timestamp_us(a, sizeof(a), age));
continue;
}
log_debug("Removing directory \"%s\".", sub_path);
if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
if (errno != ENOENT && errno != ENOTEMPTY) {
log_error_errno(errno, "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) {
log_debug("Skipping \"%s\": sticky bit set.", sub_path);
continue;
}
if (mountpoint && S_ISREG(s.st_mode))
if (s.st_uid == 0 && STR_IN_SET(dent->d_name,
".journal",
"aquota.user",
"aquota.group")) {
log_debug("Skipping \"%s\".", sub_path);
continue;
}
/* Ignore sockets that are listed in /proc/net/unix */
if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path)) {
log_debug("Skipping \"%s\": live socket.", sub_path);
continue;
}
/* Ignore device nodes */
if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) {
log_debug("Skipping \"%s\": a device.", sub_path);
continue;
}
/* Keep files on this level around if this is
* requested */
if (keep_this_level) {
log_debug("Keeping \"%s\".", sub_path);
continue;
}
age = timespec_load(&s.st_mtim);
if (age >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
/* Follows spelling in stat(1). */
log_debug("File \"%s\": modify time %s is too new.",
sub_path,
format_timestamp_us(a, sizeof(a), age));
continue;
}
age = timespec_load(&s.st_atim);
if (age >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("File \"%s\": access time %s is too new.",
sub_path,
format_timestamp_us(a, sizeof(a), age));
continue;
}
age = timespec_load(&s.st_ctim);
if (age >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("File \"%s\": change time %s is too new.",
sub_path,
format_timestamp_us(a, sizeof(a), age));
continue;
}
log_debug("unlink \"%s\"", sub_path);
if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
if (errno != ENOENT)
r = log_error_errno(errno, "unlink(%s): %m", sub_path);
deleted = true;
}
}
finish:
if (deleted) {
usec_t age1, age2;
char a[FORMAT_TIMESTAMP_MAX], b[FORMAT_TIMESTAMP_MAX];
/* Restore original directory timestamps */
times[0] = ds->st_atim;
times[1] = ds->st_mtim;
age1 = timespec_load(&ds->st_atim);
age2 = timespec_load(&ds->st_mtim);
log_debug("Restoring access and modification time on \"%s\": %s, %s",
p,
format_timestamp_us(a, sizeof(a), age1),
format_timestamp_us(b, sizeof(b), age2));
if (futimens(dirfd(d), times) < 0)
log_error_errno(errno, "utimensat(%s): %m", p);
}
return r;
}
static int path_set_perms(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
struct stat st;
assert(i);
assert(path);
/* We open the file with O_PATH here, to make the operation
* somewhat atomic. Also there's unfortunately no fchmodat()
* with AT_SYMLINK_NOFOLLOW, hence we emulate it here via
* O_PATH. */
fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Adjusting owner and mode for %s failed: %m", path);
if (fstatat(fd, "", &st, AT_EMPTY_PATH) < 0)
return log_error_errno(errno, "Failed to fstat() file %s: %m", path);
if (S_ISLNK(st.st_mode))
log_debug("Skipping mode an owner fix for symlink %s.", path);
else {
char fn[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
xsprintf(fn, "/proc/self/fd/%i", fd);
/* not using i->path directly because it may be a glob */
if (i->mode_set) {
mode_t m = i->mode;
if (i->mask_perms) {
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 (m == (st.st_mode & 07777))
log_debug("\"%s\" has right mode %o", path, st.st_mode);
else {
log_debug("chmod \"%s\" to mode %o", path, m);
if (chmod(fn, m) < 0)
return log_error_errno(errno, "chmod(%s) failed: %m", path);
}
}
if ((i->uid != st.st_uid || i->gid != st.st_gid) &&
(i->uid_set || i->gid_set)) {
log_debug("chown \"%s\" to "UID_FMT"."GID_FMT,
path,
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID);
if (chown(fn,
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID) < 0)
return log_error_errno(errno, "chown(%s) failed: %m", path);
}
}
fd = safe_close(fd);
return label_fix(path, false, false);
}
static int parse_xattrs_from_arg(Item *i) {
const char *p;
int r;
assert(i);
assert(i->argument);
p = i->argument;
for (;;) {
_cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL, *xattr_replaced = NULL;
r = extract_first_word(&p, &xattr, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE);
if (r < 0)
log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
if (r <= 0)
break;
r = specifier_printf(xattr, specifier_table, NULL, &xattr_replaced);
if (r < 0)
return log_error_errno(r, "Failed to replace specifiers in extended attribute '%s': %m", xattr);
r = split_pair(xattr_replaced, "=", &name, &value);
if (r < 0) {
log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
continue;
}
if (isempty(name) || isempty(value)) {
log_warning("Malformed extended attribute found, ignoring: %s", xattr);
continue;
}
if (strv_push_pair(&i->xattrs, name, value) < 0)
return log_oom();
name = value = NULL;
}
return 0;
}
static int path_set_xattrs(Item *i, const char *path) {
char **name, **value;
assert(i);
assert(path);
STRV_FOREACH_PAIR(name, value, i->xattrs) {
int n;
n = strlen(*value);
log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
if (lsetxattr(path, *name, *value, n, 0) < 0) {
log_error("Setting extended attribute %s=%s on %s failed: %m", *name, *value, path);
return -errno;
}
}
return 0;
}
static int parse_acls_from_arg(Item *item) {
#ifdef HAVE_ACL
int r;
assert(item);
/* If force (= modify) is set, we will not modify the acl
* afterwards, so the mask can be added now if necessary. */
r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->force);
if (r < 0)
log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
#else
log_warning_errno(ENOSYS, "ACLs are not supported. Ignoring");
#endif
return 0;
}
#ifdef HAVE_ACL
static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
_cleanup_(acl_free_charpp) char *t = NULL;
_cleanup_(acl_freep) acl_t dup = NULL;
int r;
/* Returns 0 for success, positive error if already warned,
* negative error otherwise. */
if (modify) {
r = acls_for_file(path, type, acl, &dup);
if (r < 0)
return r;
r = calc_acl_mask_if_needed(&dup);
if (r < 0)
return r;
} else {
dup = acl_dup(acl);
if (!dup)
return -errno;
/* the mask was already added earlier if needed */
}
r = add_base_acls_if_needed(&dup, path);
if (r < 0)
return r;
t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
log_debug("Setting %s ACL %s on %s.",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
r = acl_set_file(path, type, dup);
if (r < 0)
/* Return positive to indicate we already warned */
return -log_error_errno(errno,
"Setting %s ACL \"%s\" on %s failed: %m",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
return 0;
}
#endif
static int path_set_acls(Item *item, const char *path) {
int r = 0;
#ifdef HAVE_ACL
char fn[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
_cleanup_close_ int fd = -1;
struct stat st;
assert(item);
assert(path);
fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Adjusting ACL of %s failed: %m", path);
if (fstatat(fd, "", &st, AT_EMPTY_PATH) < 0)
return log_error_errno(errno, "Failed to fstat() file %s: %m", path);
if (S_ISLNK(st.st_mode)) {
log_debug("Skipping ACL fix for symlink %s.", path);
return 0;
}
xsprintf(fn, "/proc/self/fd/%i", fd);
if (item->acl_access)
r = path_set_acl(fn, path, ACL_TYPE_ACCESS, item->acl_access, item->force);
if (r == 0 && item->acl_default)
r = path_set_acl(fn, path, ACL_TYPE_DEFAULT, item->acl_default, item->force);
if (r > 0)
return -r; /* already warned */
else if (r == -EOPNOTSUPP) {
log_debug_errno(r, "ACLs not supported by file system at %s", path);
return 0;
} else if (r < 0)
log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
#endif
return r;
}
#define ATTRIBUTES_ALL \
(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 parse_attribute_from_arg(Item *item) {
static const struct {
char character;
unsigned value;
} attributes[] = {
{ 'A', FS_NOATIME_FL }, /* do not update atime */
{ 'S', FS_SYNC_FL }, /* Synchronous updates */
{ 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
{ 'a', FS_APPEND_FL }, /* writes to file may only append */
{ 'c', FS_COMPR_FL }, /* Compress file */
{ 'd', FS_NODUMP_FL }, /* do not dump file */
{ 'e', FS_EXTENT_FL }, /* Top of directory hierarchies*/
{ 'i', FS_IMMUTABLE_FL }, /* Immutable file */
{ 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
{ 's', FS_SECRM_FL }, /* Secure deletion */
{ 'u', FS_UNRM_FL }, /* Undelete */
{ 't', FS_NOTAIL_FL }, /* file tail should not be merged */
{ 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies*/
{ 'C', FS_NOCOW_FL }, /* Do not cow file */
};
enum {
MODE_ADD,
MODE_DEL,
MODE_SET
} mode = MODE_ADD;
unsigned value = 0, mask = 0;
const char *p;
assert(item);
p = item->argument;
if (p) {
if (*p == '+') {
mode = MODE_ADD;
p++;
} else if (*p == '-') {
mode = MODE_DEL;
p++;
} else if (*p == '=') {
mode = MODE_SET;
p++;
}
}
if (isempty(p) && mode != MODE_SET) {
log_error("Setting file attribute on '%s' needs an attribute specification.", item->path);
return -EINVAL;
}
for (; p && *p ; p++) {
unsigned i, v;
for (i = 0; i < ELEMENTSOF(attributes); i++)
if (*p == attributes[i].character)
break;
if (i >= ELEMENTSOF(attributes)) {
log_error("Unknown file attribute '%c' on '%s'.", *p, item->path);
return -EINVAL;
}
v = attributes[i].value;
SET_FLAG(value, v, (mode == MODE_ADD || mode == MODE_SET));
mask |= v;
}
if (mode == MODE_SET)
mask |= ATTRIBUTES_ALL;
assert(mask != 0);
item->attribute_mask = mask;
item->attribute_value = value;
item->attribute_set = true;
return 0;
}
static int path_set_attribute(Item *item, const char *path) {
_cleanup_close_ int fd = -1;
struct stat st;
unsigned f;
int r;
if (!item->attribute_set || item->attribute_mask == 0)
return 0;
fd = open(path, O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOATIME|O_NOFOLLOW);
if (fd < 0) {
if (errno == ELOOP)
return log_error_errno(errno, "Skipping file attributes adjustment on symlink %s.", path);
return log_error_errno(errno, "Cannot open '%s': %m", path);
}
if (fstat(fd, &st) < 0)
return log_error_errno(errno, "Cannot stat '%s': %m", path);
/* Issuing the file attribute ioctls on device nodes is not
* safe, as that will be delivered to the drivers, not the
* file system containing the device node. */
if (!S_ISREG(st.st_mode) && !S_ISDIR(st.st_mode)) {
log_error("Setting file flags is only supported on regular files and directories, cannot set on '%s'.", path);
return -EINVAL;
}
f = item->attribute_value & item->attribute_mask;
/* Mask away directory-specific flags */
if (!S_ISDIR(st.st_mode))
f &= ~FS_DIRSYNC_FL;
r = chattr_fd(fd, f, item->attribute_mask);
if (r < 0)
log_full_errno(r == -ENOTTY ? LOG_DEBUG : LOG_WARNING,
r,
"Cannot set file attribute for '%s', value=0x%08x, mask=0x%08x: %m",
path, item->attribute_value, item->attribute_mask);
return 0;
}
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) {
mac_selinux_create_file_prepare(path, S_IFREG);
fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
mac_selinux_create_file_clear();
}
if (fd < 0) {
if (i->type == WRITE_FILE && errno == ENOENT) {
log_debug_errno(errno, "Not writing \"%s\": %m", path);
return 0;
}
r = -errno;
if (!i->argument && errno == EROFS && stat(path, &st) == 0 &&
(i->type == CREATE_FILE || st.st_size == 0))
goto check_mode;
return log_error_errno(r, "Failed to create file %s: %m", path);
}
if (i->argument) {
_cleanup_free_ char *unescaped = NULL, *replaced = NULL;
log_debug("%s to \"%s\".", i->type == CREATE_FILE ? "Appending" : "Writing", path);
r = cunescape(i->argument, 0, &unescaped);
if (r < 0)
return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
r = specifier_printf(unescaped, specifier_table, NULL, &replaced);
if (r < 0)
return log_error_errno(r, "Failed to replace specifiers in parameter to write '%s': %m", unescaped);
r = loop_write(fd, replaced, strlen(replaced), false);
if (r < 0)
return log_error_errno(r, "Failed to write file \"%s\": %m", path);
} else
log_debug("\"%s\" has been created.", path);
fd = safe_close(fd);
if (stat(path, &st) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
check_mode:
if (!S_ISREG(st.st_mode)) {
log_error("%s is not a file.", path);
return -EEXIST;
}
r = path_set_perms(i, path);
if (r < 0)
return r;
return 0;
}
typedef int (*action_t)(Item *, const char *);
static int item_do_children(Item *i, const char *path, action_t action) {
_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_nomod(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 (STR_IN_SET(de->d_name, ".", ".."))
continue;
p = strjoin(path, "/", de->d_name, NULL);
if (!p)
return -ENOMEM;
q = action(i, p);
if (q < 0 && q != -ENOENT && r == 0)
r = q;
if (IN_SET(de->d_type, DT_UNKNOWN, DT_DIR)) {
q = item_do_children(i, p, action);
if (q < 0 && r == 0)
r = q;
}
}
return r;
}
static int glob_item(Item *i, action_t action, bool recursive) {
_cleanup_globfree_ glob_t g = {
.gl_closedir = (void (*)(void *)) closedir,
.gl_readdir = (struct dirent *(*)(void *)) readdir,
.gl_opendir = (void *(*)(const char *)) opendir_nomod,
.gl_lstat = lstat,
.gl_stat = stat,
};
int r = 0, k;
char **fn;
errno = 0;
k = glob(i->path, GLOB_NOSORT|GLOB_BRACE|GLOB_ALTDIRFUNC, NULL, &g);
if (k != 0 && k != GLOB_NOMATCH)
return log_error_errno(errno ?: EIO, "glob(%s) failed: %m", i->path);
STRV_FOREACH(fn, g.gl_pathv) {
k = action(i, *fn);
if (k < 0 && r == 0)
r = k;
if (recursive) {
k = item_do_children(i, *fn, action);
if (k < 0 && r == 0)
r = k;
}
}
return r;
}
typedef enum {
CREATION_NORMAL,
CREATION_EXISTING,
CREATION_FORCE,
_CREATION_MODE_MAX,
_CREATION_MODE_INVALID = -1
} CreationMode;
static const char *creation_mode_verb_table[_CREATION_MODE_MAX] = {
[CREATION_NORMAL] = "Created",
[CREATION_EXISTING] = "Found existing",
[CREATION_FORCE] = "Created replacement",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
static int create_item(Item *i) {
_cleanup_free_ char *resolved = NULL;
struct stat st;
int r = 0;
int q = 0;
CreationMode creation;
assert(i);
log_debug("Running create action for entry %c %s", (char) i->type, i->path);
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 = specifier_printf(i->argument, specifier_table, NULL, &resolved);
if (r < 0)
return log_error_errno(r, "Failed to substitute specifiers in copy source %s: %m", i->argument);
log_debug("Copying tree \"%s\" to \"%s\".", resolved, i->path);
r = copy_tree(resolved, i->path, false);
if (r == -EROFS && stat(i->path, &st) == 0)
r = -EEXIST;
if (r < 0) {
struct stat a, b;
if (r != -EEXIST)
return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
if (stat(resolved, &a) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", resolved);
if (stat(i->path, &b) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
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 = path_set_perms(i, i->path);
if (r < 0)
return r;
break;
case WRITE_FILE:
r = glob_item(i, write_one_file, false);
if (r < 0)
return r;
break;
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
RUN_WITH_UMASK(0000)
mkdir_parents_label(i->path, 0755);
if (IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA)) {
if (btrfs_is_subvol(isempty(arg_root) ? "/" : arg_root) <= 0)
/* Don't create a subvolume unless the
* root directory is one, too. We do
* this under the assumption that if
* the root directory is just a plain
* directory (i.e. very light-weight),
* we shouldn't try to split it up
* into subvolumes (i.e. more
* heavy-weight). Thus, chroot()
* environments and suchlike will get
* a full brtfs subvolume set up below
* their tree only if they
* specifically set up a btrfs
* subvolume for the root dir too. */
r = -ENOTTY;
else {
RUN_WITH_UMASK((~i->mode) & 0777)
r = btrfs_subvol_make(i->path);
}
} else
r = 0;
if (IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY) || r == -ENOTTY)
RUN_WITH_UMASK(0000)
r = mkdir_label(i->path, i->mode);
if (r < 0) {
int k;
if (r != -EEXIST && r != -EROFS)
return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", i->path);
k = is_dir(i->path, false);
if (k == -ENOENT && r == -EROFS)
return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", i->path);
if (k < 0)
return log_error_errno(k, "Failed to check if %s exists: %m", i->path);
if (!k) {
log_warning("\"%s\" already exists and is not a directory.", i->path);
return 0;
}
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s directory \"%s\".", creation_mode_verb_to_string(creation), i->path);
if (IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
r = btrfs_subvol_auto_qgroup(i->path, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
if (r == -ENOTTY)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
else if (r == -EROFS)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
else if (r == -ENOPROTOOPT)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
else if (r < 0)
q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
else if (r > 0)
log_debug("Adjusted quota for subvolume \"%s\".", i->path);
else if (r == 0)
log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
}
r = path_set_perms(i, i->path);
if (q < 0)
return q;
if (r < 0)
return r;
break;
case CREATE_FIFO:
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, S_IFIFO);
r = mkfifo(i->path, i->mode);
mac_selinux_create_file_clear();
}
if (r < 0) {
if (errno != EEXIST)
return log_error_errno(errno, "Failed to create fifo %s: %m", i->path);
if (lstat(i->path, &st) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
if (!S_ISFIFO(st.st_mode)) {
if (i->force) {
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, S_IFIFO);
r = mkfifo_atomic(i->path, i->mode);
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create fifo %s: %m", i->path);
creation = CREATION_FORCE;
} else {
log_warning("\"%s\" already exists and is not a fifo.", i->path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), i->path);
r = path_set_perms(i, i->path);
if (r < 0)
return r;
break;
}
case CREATE_SYMLINK: {
r = specifier_printf(i->argument, specifier_table, NULL, &resolved);
if (r < 0)
return log_error_errno(r, "Failed to substitute specifiers in symlink target %s: %m", i->argument);
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlink(resolved, i->path);
mac_selinux_create_file_clear();
if (r < 0) {
_cleanup_free_ char *x = NULL;
if (errno != EEXIST)
return log_error_errno(errno, "symlink(%s, %s) failed: %m", resolved, i->path);
r = readlink_malloc(i->path, &x);
if (r < 0 || !streq(resolved, x)) {
if (i->force) {
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlink_atomic(resolved, i->path);
mac_selinux_create_file_clear();
if (r < 0)
return log_error_errno(r, "symlink(%s, %s) failed: %m", resolved, i->path);
creation = CREATION_FORCE;
} else {
log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
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) {
mac_selinux_create_file_prepare(i->path, file_type);
r = mknod(i->path, i->mode | file_type, i->major_minor);
mac_selinux_create_file_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)
return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
if (lstat(i->path, &st) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
if ((st.st_mode & S_IFMT) != file_type) {
if (i->force) {
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, file_type);
r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
creation = CREATION_FORCE;
} else {
log_debug("%s is not a device node.", i->path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s %s device node \"%s\" %u:%u.",
creation_mode_verb_to_string(creation),
i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
i->path, major(i->mode), minor(i->mode));
r = path_set_perms(i, i->path);
if (r < 0)
return r;
break;
}
case ADJUST_MODE:
case RELABEL_PATH:
r = glob_item(i, path_set_perms, false);
if (r < 0)
return r;
break;
case RECURSIVE_RELABEL_PATH:
r = glob_item(i, path_set_perms, true);
if (r < 0)
return r;
break;
case SET_XATTR:
r = glob_item(i, path_set_xattrs, false);
if (r < 0)
return r;
break;
case RECURSIVE_SET_XATTR:
r = glob_item(i, path_set_xattrs, true);
if (r < 0)
return r;
break;
case SET_ACL:
r = glob_item(i, path_set_acls, false);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ACL:
r = glob_item(i, path_set_acls, true);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
r = glob_item(i, path_set_attribute, false);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ATTRIBUTE:
r = glob_item(i, path_set_attribute, true);
if (r < 0)
return r;
break;
}
return 0;
}
static int remove_item_instance(Item *i, const char *instance) {
int r;
assert(i);
switch (i->type) {
case REMOVE_PATH:
if (remove(instance) < 0 && errno != ENOENT)
return log_error_errno(errno, "rm(%s): %m", instance);
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. */
log_debug("rm -rf \"%s\"", instance);
r = rm_rf(instance, (i->type == RECURSIVE_REMOVE_PATH ? REMOVE_ROOT|REMOVE_SUBVOLUME : 0) | REMOVE_PHYSICAL);
if (r < 0 && r != -ENOENT)
return log_error_errno(r, "rm_rf(%s): %m", instance);
break;
default:
assert_not_reached("wut?");
}
return 0;
}
static int remove_item(Item *i) {
int r = 0;
assert(i);
log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case CREATE_FILE:
case TRUNCATE_FILE:
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
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:
case SET_XATTR:
case RECURSIVE_SET_XATTR:
case SET_ACL:
case RECURSIVE_SET_ACL:
case SET_ATTRIBUTE:
case RECURSIVE_SET_ATTRIBUTE:
break;
case REMOVE_PATH:
case TRUNCATE_DIRECTORY:
case RECURSIVE_REMOVE_PATH:
r = glob_item(i, remove_item_instance, false);
break;
}
return r;
}
static int clean_item_instance(Item *i, const char* instance) {
_cleanup_closedir_ DIR *d = NULL;
struct stat s, ps;
bool mountpoint;
usec_t cutoff, n;
char timestamp[FORMAT_TIMESTAMP_MAX];
assert(i);
if (!i->age_set)
return 0;
n = now(CLOCK_REALTIME);
if (n < i->age)
return 0;
cutoff = n - i->age;
d = opendir_nomod(instance);
if (!d) {
if (errno == ENOENT || errno == ENOTDIR) {
log_debug_errno(errno, "Directory \"%s\": %m", instance);
return 0;
}
log_error_errno(errno, "Failed to open directory %s: %m", instance);
return -errno;
}
if (fstat(dirfd(d), &s) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
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)
return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
mountpoint = s.st_dev != ps.st_dev || s.st_ino == ps.st_ino;
log_debug("Cleanup threshold for %s \"%s\" is %s",
mountpoint ? "mount point" : "directory",
instance,
format_timestamp_us(timestamp, sizeof(timestamp), cutoff));
return dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,
MAX_DEPTH, i->keep_first_level);
}
static int clean_item(Item *i) {
int r = 0;
assert(i);
log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
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, false);
break;
default:
break;
}
return r;
}
static int process_item_array(ItemArray *array);
static int process_item(Item *i) {
int r, q, p, t = 0;
_cleanup_free_ char *prefix = NULL;
assert(i);
if (i->done)
return 0;
i->done = true;
prefix = malloc(strlen(i->path) + 1);
if (!prefix)
return log_oom();
PATH_FOREACH_PREFIX(prefix, i->path) {
ItemArray *j;
j = ordered_hashmap_get(items, prefix);
if (j) {
int s;
s = process_item_array(j);
if (s < 0 && t == 0)
t = s;
}
}
r = arg_create ? create_item(i) : 0;
q = arg_remove ? remove_item(i) : 0;
p = arg_clean ? clean_item(i) : 0;
return t < 0 ? t :
r < 0 ? r :
q < 0 ? q :
p;
}
static int process_item_array(ItemArray *array) {
unsigned n;
int r = 0, k;
assert(array);
for (n = 0; n < array->count; n++) {
k = process_item(array->items + n);
if (k < 0 && r == 0)
r = k;
}
return r;
}
static void item_free_contents(Item *i) {
assert(i);
free(i->path);
free(i->argument);
strv_free(i->xattrs);
#ifdef HAVE_ACL
acl_free(i->acl_access);
acl_free(i->acl_default);
#endif
}
static void item_array_free(ItemArray *a) {
unsigned n;
if (!a)
return;
for (n = 0; n < a->count; n++)
item_free_contents(a->items + n);
free(a->items);
free(a);
}
static int item_compare(const void *a, const void *b) {
const Item *x = a, *y = b;
/* Make sure that the ownership taking item is put first, so
* that we first create the node, and then can adjust it */
if (takes_ownership(x->type) && !takes_ownership(y->type))
return -1;
if (!takes_ownership(x->type) && takes_ownership(y->type))
return 1;
return (int) x->type - (int) y->type;
}
static bool item_compatible(Item *a, Item *b) {
assert(a);
assert(b);
assert(streq(a->path, b->path));
if (takes_ownership(a->type) && takes_ownership(b->type))
/* check if the items are the same */
return streq_ptr(a->argument, b->argument) &&
a->uid_set == b->uid_set &&
a->uid == b->uid &&
a->gid_set == b->gid_set &&
a->gid == b->gid &&
a->mode_set == b->mode_set &&
a->mode == b->mode &&
a->age_set == b->age_set &&
a->age == b->age &&
a->mask_perms == b->mask_perms &&
a->keep_first_level == b->keep_first_level &&
a->major_minor == b->major_minor;
return true;
}
static bool should_include_path(const char *path) {
char **prefix;
STRV_FOREACH(prefix, arg_exclude_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
path, *prefix);
return false;
}
STRV_FOREACH(prefix, arg_include_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
return true;
}
/* no matches, so we should include this path only if we
* have no whitelist at all */
if (strv_length(arg_include_prefixes) == 0)
return true;
log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
return false;
}
static int parse_line(const char *fname, unsigned line, const char *buffer) {
_cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
_cleanup_(item_free_contents) Item i = {};
ItemArray *existing;
OrderedHashmap *h;
int r, pos;
bool force = false, boot = false;
assert(fname);
assert(line >= 1);
assert(buffer);
r = extract_many_words(
&buffer,
NULL,
EXTRACT_QUOTES,
&action,
&path,
&mode,
&user,
&group,
&age,
NULL);
if (r < 0)
return log_error_errno(r, "[%s:%u] Failed to parse line: %m", fname, line);
else if (r < 2) {
log_error("[%s:%u] Syntax error.", fname, line);
return -EIO;
}
if (!isempty(buffer) && !streq(buffer, "-")) {
i.argument = strdup(buffer);
if (!i.argument)
return log_oom();
}
if (isempty(action)) {
log_error("[%s:%u] Command too short '%s'.", fname, line, action);
return -EINVAL;
}
for (pos = 1; action[pos]; pos++) {
if (action[pos] == '!' && !boot)
boot = true;
else if (action[pos] == '+' && !force)
force = true;
else {
log_error("[%s:%u] Unknown modifiers in command '%s'",
fname, line, action);
return -EINVAL;
}
}
if (boot && !arg_boot) {
log_debug("Ignoring entry %s \"%s\" because --boot is not specified.",
action, path);
return 0;
}
i.type = action[0];
i.force = force;
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;
}
switch (i.type) {
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
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:
if (i.argument)
log_warning("[%s:%u] %c lines don't take argument fields, ignoring.", fname, line, i.type);
break;
case CREATE_FILE:
case TRUNCATE_FILE:
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();
} else 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;
}
case SET_XATTR:
case RECURSIVE_SET_XATTR:
if (!i.argument) {
log_error("[%s:%u] Set extended attribute requires argument.", fname, line);
return -EBADMSG;
}
r = parse_xattrs_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ACL:
case RECURSIVE_SET_ACL:
if (!i.argument) {
log_error("[%s:%u] Set ACLs requires argument.", fname, line);
return -EBADMSG;
}
r = parse_acls_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
case RECURSIVE_SET_ATTRIBUTE:
if (!i.argument) {
log_error("[%s:%u] Set file attribute requires argument.", fname, line);
return -EBADMSG;
}
r = parse_attribute_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;
}
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 = prefix_root(arg_root, i.path);
if (!p)
return log_oom();
free(i.path);
i.path = p;
}
if (!isempty(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 (!isempty(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 (!isempty(mode) && !streq(mode, "-")) {
const char *mm = mode;
unsigned m;
if (*mm == '~') {
i.mask_perms = true;
mm++;
}
if (parse_mode(mm, &m) < 0) {
log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
return -EBADMSG;
}
i.mode = m;
i.mode_set = true;
} else
i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
if (!isempty(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 = ordered_hashmap_get(h, i.path);
if (existing) {
unsigned n;
for (n = 0; n < existing->count; n++) {
if (!item_compatible(existing->items + n, &i)) {
log_warning("[%s:%u] Duplicate line for path \"%s\", ignoring.",
fname, line, i.path);
return 0;
}
}
} else {
existing = new0(ItemArray, 1);
r = ordered_hashmap_put(h, i.path, existing);
if (r < 0)
return log_oom();
}
if (!GREEDY_REALLOC(existing->items, existing->size, existing->count + 1))
return log_oom();
memcpy(existing->items + existing->count++, &i, sizeof(i));
/* Sort item array, to enforce stable ordering of application */
qsort_safe(existing->items, existing->count, sizeof(Item), item_compare);
zero(i);
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 with the specified prefix\n"
" --exclude-prefix=PATH Ignore rules 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, r;
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:
return version();
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:
r = parse_path_argument_and_warn(optarg, true, &arg_root);
if (r < 0)
return r;
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;
FILE *f;
char line[LINE_MAX];
Iterator iterator;
unsigned v = 0;
Item *i;
int r;
assert(fn);
if (streq(fn, "-")) {
log_debug("Reading config from stdin.");
fn = "";
f = stdin;
} else {
r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &_f);
if (r < 0) {
if (ignore_enoent && r == -ENOENT) {
log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
return 0;
}
return log_error_errno(r, "Failed to open '%s': %m", fn);
}
log_debug("Reading config file \"%s\".", fn);
f = _f;
}
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 */
ORDERED_HASHMAP_FOREACH(i, globs, iterator) {
Iterator iter;
Item *j, *candidate_item = NULL;
if (i->type != IGNORE_DIRECTORY_PATH)
continue;
ORDERED_HASHMAP_FOREACH(j, items, iter) {
if (!IN_SET(j->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA))
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 && candidate_item->age_set) {
i->age = candidate_item->age;
i->age_set = true;
}
}
if (ferror(f)) {
log_error_errno(errno, "Failed to read from file %s: %m", fn);
if (r == 0)
r = -EIO;
}
return r;
}
int main(int argc, char *argv[]) {
int r, k;
ItemArray *a;
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);
mac_selinux_init();
items = ordered_hashmap_new(&string_hash_ops);
globs = ordered_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_errno(r, "Failed to enumerate tmpfiles.d files: %m");
goto finish;
}
STRV_FOREACH(f, files) {
k = read_config_file(*f, true);
if (k < 0 && r == 0)
r = k;
}
}
/* The non-globbing ones usually create things, hence we apply
* them first */
ORDERED_HASHMAP_FOREACH(a, items, iterator) {
k = process_item_array(a);
if (k < 0 && r == 0)
r = k;
}
/* The globbing ones usually alter things, hence we apply them
* second. */
ORDERED_HASHMAP_FOREACH(a, globs, iterator) {
k = process_item_array(a);
if (k < 0 && r == 0)
r = k;
}
finish:
while ((a = ordered_hashmap_steal_first(items)))
item_array_free(a);
while ((a = ordered_hashmap_steal_first(globs)))
item_array_free(a);
ordered_hashmap_free(items);
ordered_hashmap_free(globs);
free(arg_include_prefixes);
free(arg_exclude_prefixes);
free(arg_root);
set_free_free(unix_sockets);
mac_selinux_finish();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}