156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "sd-journal.h"
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "parse-util.h"
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#include "string-util.h"
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#include "syslog-util.h"
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#include "util.h"
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#include "terminal-util.h"
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static const char *arg_identifier = NULL;
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static int arg_priority = LOG_INFO;
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static bool arg_level_prefix = true;
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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-cat", "1", &link);
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if (r < 0)
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return log_oom();
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printf("%s [OPTIONS...] {COMMAND} ...\n\n"
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"Execute process with stdout/stderr connected to the journal.\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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" -t --identifier=STRING Set syslog identifier\n"
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" -p --priority=PRIORITY Set priority value (0..7)\n"
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" --level-prefix=BOOL Control whether level prefix shall be parsed\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, link
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);
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return 0;
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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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ARG_LEVEL_PREFIX
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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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{ "identifier", required_argument, NULL, 't' },
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{ "priority", required_argument, NULL, 'p' },
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{ "level-prefix", required_argument, NULL, ARG_LEVEL_PREFIX },
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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, "+ht:p:", 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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return version();
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case 't':
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if (isempty(optarg))
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arg_identifier = NULL;
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else
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arg_identifier = optarg;
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break;
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case 'p':
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arg_priority = log_level_from_string(optarg);
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if (arg_priority < 0) {
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log_error("Failed to parse priority value.");
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return -EINVAL;
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}
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break;
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case ARG_LEVEL_PREFIX: {
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int k;
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k = parse_boolean(optarg);
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if (k < 0)
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return log_error_errno(k, "Failed to parse level prefix value.");
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arg_level_prefix = k;
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break;
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}
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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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_cleanup_close_ int fd = -1, saved_stderr = -1;
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int r;
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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fd = sd_journal_stream_fd(arg_identifier, arg_priority, arg_level_prefix);
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if (fd < 0) {
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r = log_error_errno(fd, "Failed to create stream fd: %m");
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goto finish;
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}
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saved_stderr = fcntl(STDERR_FILENO, F_DUPFD_CLOEXEC, 3);
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r = rearrange_stdio(STDIN_FILENO, fd, fd); /* Invalidates fd on succcess + error! */
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fd = -1;
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdout/stderr: %m");
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goto finish;
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}
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if (argc <= optind)
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(void) execl("/bin/cat", "/bin/cat", NULL);
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else
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(void) execvp(argv[optind], argv + optind);
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r = -errno;
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/* Let's try to restore a working stderr, so we can print the error message */
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if (saved_stderr >= 0)
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(void) dup3(saved_stderr, STDERR_FILENO, 0);
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log_error_errno(r, "Failed to execute process: %m");
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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