ad118bda15
The latest consolidation cleanup of write_string_file() revealed some users of that helper which should have used write_string_file_no_create() in the past but didn't. Basically, all existing users that write to files in /sys and /proc should not expect to write to a file which is not yet existant.
206 lines
5.4 KiB
C
206 lines
5.4 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 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 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 <stdlib.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include <limits.h>
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#include <getopt.h>
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#include "log.h"
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#include "strv.h"
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#include "util.h"
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#include "conf-files.h"
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#include "fileio.h"
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#include "build.h"
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static const char conf_file_dirs[] = CONF_DIRS_NULSTR("binfmt");
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static int delete_rule(const char *rule) {
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_cleanup_free_ char *x = NULL, *fn = NULL;
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char *e;
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assert(rule[0]);
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x = strdup(rule);
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if (!x)
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return log_oom();
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e = strchrnul(x+1, x[0]);
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*e = 0;
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fn = strappend("/proc/sys/fs/binfmt_misc/", x+1);
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if (!fn)
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return log_oom();
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return write_string_file(fn, "-1", 0);
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}
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static int apply_rule(const char *rule) {
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int r;
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delete_rule(rule);
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r = write_string_file("/proc/sys/fs/binfmt_misc/register", rule, 0);
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if (r < 0)
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return log_error_errno(r, "Failed to add binary format: %m");
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return 0;
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}
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static int apply_file(const char *path, bool ignore_enoent) {
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(path);
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r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
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if (r < 0) {
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if (ignore_enoent && r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
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}
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log_debug("apply: %s", path);
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for (;;) {
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char l[LINE_MAX], *p;
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int k;
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if (!fgets(l, sizeof(l), f)) {
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if (feof(f))
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break;
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log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
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return -errno;
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}
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p = strstrip(l);
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if (!*p)
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continue;
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if (strchr(COMMENTS "\n", *p))
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continue;
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k = apply_rule(p);
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if (k < 0 && r == 0)
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r = k;
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}
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return r;
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}
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static void help(void) {
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printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
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"Registers binary formats.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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, program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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int r, k;
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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r = 0;
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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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k = apply_file(argv[i], false);
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if (k < 0 && r == 0)
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r = k;
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}
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} else {
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_cleanup_strv_free_ char **files = NULL;
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char **f;
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r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
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if (r < 0) {
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log_error_errno(r, "Failed to enumerate binfmt.d files: %m");
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goto finish;
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}
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/* Flush out all rules */
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write_string_file("/proc/sys/fs/binfmt_misc/status", "-1", 0);
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STRV_FOREACH(f, files) {
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k = apply_file(*f, true);
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if (k < 0 && r == 0)
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r = k;
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}
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}
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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