6dc2852c64
Functions either should generate error messages for everything they do themselves, or for nothing and let the caller do it. But they certainly shouldn't generate errors for some messages but not for others. Since the function in this case is one that generates messages on its own, it really should do that for everything, not just for some things, hence.
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*-*- 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 2014 Kay Sievers
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 <errno.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.h>
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#include "base-filesystem.h"
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#include "log.h"
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#include "macro.h"
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#include "strv.h"
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#include "util.h"
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#include "label.h"
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#include "mkdir.h"
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typedef struct BaseFilesystem {
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const char *dir;
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mode_t mode;
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const char *target;
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const char *exists;
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} BaseFilesystem;
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static const BaseFilesystem table[] = {
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{ "bin", 0, "usr/bin\0", NULL },
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{ "lib", 0, "usr/lib\0", NULL },
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{ "root", 0755, NULL, NULL },
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{ "sbin", 0, "usr/sbin\0", NULL },
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#if defined(__i386__) || defined(__x86_64__)
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{ "lib64", 0, "usr/lib/x86_64-linux-gnu\0"
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"usr/lib64\0", "ld-linux-x86-64.so.2" },
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#endif
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};
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int base_filesystem_create(const char *root) {
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_cleanup_close_ int fd = -1;
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unsigned i;
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int r;
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fd = open(root, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW);
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if (fd < 0) {
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log_error("Failed to open root file system: %m");
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return -errno;
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}
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for (i = 0; i < ELEMENTSOF(table); i ++) {
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if (faccessat(fd, table[i].dir, F_OK, AT_SYMLINK_NOFOLLOW) >= 0)
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continue;
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if (table[i].target) {
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const char *target = NULL, *s;
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/* check if one of the targets exists */
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NULSTR_FOREACH(s, table[i].target) {
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if (faccessat(fd, s, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
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continue;
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/* check if a specific file exists at the target path */
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if (table[i].exists) {
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_cleanup_free_ char *p = NULL;
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p = strjoin(s, "/", table[i].exists, NULL);
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if (!p)
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return log_oom();
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if (faccessat(fd, p, F_OK, AT_SYMLINK_NOFOLLOW) < 0)
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continue;
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}
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target = s;
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break;
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}
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if (!target)
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continue;
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r = symlinkat(target, fd, table[i].dir);
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if (r < 0 && errno != EEXIST) {
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log_error("Failed to create symlink at %s/%s: %m", root, table[i].dir);
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return -errno;
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}
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continue;
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}
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RUN_WITH_UMASK(0000)
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r = mkdirat(fd, table[i].dir, table[i].mode);
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if (r < 0 && errno != EEXIST) {
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log_error("Failed to create directory at %s/%s: %m", root, table[i].dir);
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return -errno;
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}
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}
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return 0;
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}
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