mirror of
https://github.com/AuxXxilium/eudev.git
synced 2025-03-10 07:54:10 +07:00
tempfiles: add little utility for creating volatile files/dirs in tmpfs hierarchies
This commit is contained in:
Lennart Poettering
parent
5c78d8e242
commit
5008d5815a
1
.gitignore
vendored
1
.gitignore
vendored
@ -1,3 +1,4 @@
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systemd-tempfiles
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systemd-readahead-collect
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systemd-readahead-replay
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systemd-reply-password
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12
Makefile.am
12
Makefile.am
@ -94,7 +94,8 @@ rootlibexec_PROGRAMS = \
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systemd-vconsole-setup \
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systemd-reply-password \
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systemd-readahead-collect \
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systemd-readahead-replay
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systemd-readahead-replay \
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systemd-tempfiles
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noinst_PROGRAMS = \
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test-engine \
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@ -620,6 +621,15 @@ systemd_modules_load_SOURCES = \
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systemd_modules_load_CFLAGS = \
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$(AM_CFLAGS)
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systemd_tempfiles_LDADD = \
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libsystemd-basic.la
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systemd_tempfiles_SOURCES = \
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src/tempfiles.c
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systemd_tempfiles_CFLAGS = \
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$(AM_CFLAGS)
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systemd_modules_load_LDADD = \
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libsystemd-basic.la
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8
fixme
8
fixme
@ -89,19 +89,17 @@
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* ask-password tty timeout
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* readahead() vs. fadvise() vs. ioprio
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* properly handle multiple inotify events per read() in path.c and util.c
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* tmpwatch: what does "-umc" actually mean?
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* tmpwatch: lower ioprio
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* readahead: btrfs/LVM SSD detection
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* LSB provides should only create targets, never aliases
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* d /var/run/screen 0755 root utmp
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* s/tempfiles/volatile-files/
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* use .conf suffix for locale/vconsole/...
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External:
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307
src/tempfiles.c
Normal file
307
src/tempfiles.c
Normal file
@ -0,0 +1,307 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <dirent.h>
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#include <grp.h>
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#include <pwd.h>
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#include "log.h"
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#include "util.h"
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#include "strv.h"
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#include "label.h"
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/* This reads all files listed in /etc/tempfiles.d/?*.conf and creates
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* them in the file system. This is intended to be used to create
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* properly owned directories beneath /tmp, /var/tmp, /var/run and
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* /var/lock which are volatile and hence need to be recreated on
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* bootup. */
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static void process_line(const char *fname, unsigned line, const char *buffer, const char *prefix) {
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char type;
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char *path = NULL;
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unsigned mode;
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char *user = NULL, *group = NULL;
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uid_t uid;
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gid_t gid;
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bool uid_set = false, gid_set = false;
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int n, fd = -1;
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assert(fname);
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assert(line >= 1);
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assert(buffer);
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if ((n = sscanf(buffer,
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"%c "
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"%ms "
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"%o "
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"%ms "
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"%ms ",
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&type,
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&path,
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&mode,
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&user,
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&group)) < 2) {
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log_error("[%s:%u] Syntax error.", fname, line);
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goto finish;
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}
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if (type != 'f' && type != 'd') {
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log_error("[%s:%u] Unknown file type '%c'.", fname, line, type);
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goto finish;
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}
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if (prefix && !path_startswith(path, prefix))
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goto finish;
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if (user && !streq(user, "-")) {
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unsigned long lu;
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struct passwd *p;
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if (streq(user, "root") || streq(user, "0"))
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uid = 0;
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else if (safe_atolu(user, &lu) >= 0)
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uid = (uid_t) lu;
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else if ((p = getpwnam(user)))
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uid = p->pw_uid;
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else {
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log_error("[%s:%u] Unknown user '%s'.", fname, line, user);
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goto finish;
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}
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uid_set = true;
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}
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if (group && !streq(group, "-")) {
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unsigned long lu;
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struct group *g;
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if (streq(group, "root") || streq(group, "0"))
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gid = 0;
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else if (safe_atolu(group, &lu) >= 0)
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gid = (gid_t) lu;
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else if ((g = getgrnam(group)))
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gid = g->gr_gid;
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else {
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log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
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goto finish;
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}
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gid_set = true;
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}
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if (n < 3)
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mode = type == 'f' ? 0644 : 0755;
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if (type == 'f') {
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mode_t u;
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struct stat st;
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u = umask(0);
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fd = open(path, O_CREAT|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, mode);
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umask(u);
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if (fd < 0) {
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log_error("Failed to create file %s: %m", path);
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goto finish;
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}
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if (fstat(fd, &st) < 0) {
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log_error("stat(%s) failed: %m", path);
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goto finish;
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}
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if (!S_ISREG(st.st_mode)) {
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log_error("%s is not a file.", path);
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goto finish;
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}
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if (fchmod(fd, mode) < 0) {
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log_error("chmod(%s) failed: %m", path);
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goto finish;
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}
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if (uid_set || gid_set) {
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if (fchown(fd,
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uid_set ? uid : (uid_t) -1,
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gid_set ? gid : (gid_t) -1) < 0) {
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log_error("chown(%s) failed: %m", path);
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goto finish;
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}
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}
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} else if (type == 'd') {
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mode_t u;
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int r;
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struct stat st;
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u = umask(0);
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r = mkdir(path, mode);
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umask(u);
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if (r < 0 && errno != EEXIST) {
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log_error("Failed to create directory %s: %m", path);
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goto finish;
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}
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if (stat(path, &st) < 0) {
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log_error("stat(%s) failed: %m", path);
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goto finish;
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}
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if (!S_ISDIR(st.st_mode)) {
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log_error("%s is not a directory.", path);
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goto finish;
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}
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if (chmod(path, mode) < 0) {
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log_error("chmod(%s) failed: %m", path);
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goto finish;
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}
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if (uid_set || gid_set) {
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if (chown(path,
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uid_set ? uid : (uid_t) -1,
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gid_set ? gid : (gid_t) -1) < 0) {
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log_error("chown(%s) failed: %m", path);
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goto finish;
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}
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}
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}
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label_fix(path);
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log_debug("%s created successfully.", path);
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finish:
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free(path);
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free(user);
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free(group);
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if (fd >= 0)
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close_nointr_nofail(fd);
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}
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static int scandir_filter(const struct dirent *d) {
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assert(d);
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if (ignore_file(d->d_name))
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return 0;
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if (d->d_type != DT_REG &&
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d->d_type != DT_LNK)
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return 0;
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return endswith(d->d_name, ".conf");
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}
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int main(int argc, char *argv[]) {
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struct dirent **de = NULL;
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int r = EXIT_FAILURE, n, i;
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const char *prefix = NULL;
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if (argc > 2) {
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log_error("This program takes no more than one argument.");
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return EXIT_FAILURE;
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} else if (argc > 1)
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prefix = argv[1];
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else
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prefix = "/";
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log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
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log_parse_environment();
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log_open();
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label_init();
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if ((n = scandir("/etc/tempfiles.d/", &de, scandir_filter, alphasort)) < 0) {
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if (errno == ENOENT)
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r = EXIT_SUCCESS;
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else
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log_error("Failed to enumerate /etc/tempfiles.d/ files: %m");
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goto finish;
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}
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r = EXIT_SUCCESS;
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for (i = 0; i < n; i++) {
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int k;
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char *fn;
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FILE *f;
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unsigned j;
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k = asprintf(&fn, "/etc/tempfiles.d/%s", de[i]->d_name);
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free(de[i]);
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if (k < 0) {
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log_error("Failed to allocate file name.");
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r = EXIT_FAILURE;
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continue;
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}
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f = fopen(fn, "re");
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free(fn);
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if (!f) {
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log_error("Failed to open %s: %m", fn);
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r = EXIT_FAILURE;
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continue;
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}
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j = 0;
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for (;;) {
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char line[LINE_MAX], *l;
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if (!(fgets(line, sizeof(line), f)))
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break;
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j++;
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l = strstrip(line);
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if (*l == '#' || *l == 0)
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continue;
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process_line(de[i]->d_name, j, l, prefix);
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}
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if (ferror(f)) {
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r = EXIT_FAILURE;
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log_error("Failed to read from file: %m");
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}
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fclose(f);
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}
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free(de);
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finish:
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return r;
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}
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