41d1f469cf
Presently, CLI utilities such as systemctl will check whether they have a tty attached or not to decide whether to parse /proc/cmdline or EFI variable SystemdOptions looking for systemd.log_* entries. But this check will be misleading if these tools are being launched by a daemon, such as a monitoring daemon or automation service that runs in background. Make log handling of CLI tools uniform by never checking /proc/cmdline or EFI variables to determine the logging level. Furthermore, introduce a new log_setup_cli() shortcut to set up common options used by most command-line utilities.
116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <getopt.h>
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#include "fd-util.h"
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#include "fs-util.h"
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#include "log.h"
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#include "main-func.h"
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static char *arg_root = NULL;
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static int arg_flags = 0;
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static bool arg_open = false;
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_ROOT = 0x1000,
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ARG_OPEN,
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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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{ "root", required_argument, NULL, ARG_ROOT },
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{ "open", no_argument, NULL, ARG_OPEN },
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{ "prefix-root", no_argument, NULL, CHASE_PREFIX_ROOT },
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{ "nonexistent", no_argument, NULL, CHASE_NONEXISTENT },
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{ "no_autofs", no_argument, NULL, CHASE_NO_AUTOFS },
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{ "safe", no_argument, NULL, CHASE_SAFE },
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{ "trail-slash", no_argument, NULL, CHASE_TRAIL_SLASH },
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{ "step", no_argument, NULL, CHASE_STEP },
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{ "nofollow", no_argument, NULL, CHASE_NOFOLLOW },
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{ "warn", no_argument, NULL, CHASE_WARN },
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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, "", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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printf("Syntax:\n"
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" %s [OPTION...] path...\n"
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"Options:\n"
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, argv[0]);
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for (size_t i = 0; i < ELEMENTSOF(options) - 1; i++)
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printf(" --%s\n", options[i].name);
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return 0;
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case ARG_ROOT:
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arg_root = optarg;
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break;
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case ARG_OPEN:
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arg_open = true;
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break;
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case CHASE_PREFIX_ROOT:
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case CHASE_NONEXISTENT:
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case CHASE_NO_AUTOFS:
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case CHASE_SAFE:
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case CHASE_TRAIL_SLASH:
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case CHASE_STEP:
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case CHASE_NOFOLLOW:
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case CHASE_WARN:
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arg_flags |= c;
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break;
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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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if (optind == argc)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "At least one argument is required.");
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return 1;
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}
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static int run(int argc, char **argv) {
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int r;
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log_setup_cli();
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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for (int i = optind; i < argc; i++) {
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_cleanup_free_ char *p = NULL;
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_cleanup_close_ int fd = -1;
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printf("%s ", argv[i]);
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fflush(stdout);
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r = chase_symlinks(argv[i], arg_root, arg_flags, &p, arg_open ? &fd : NULL);
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if (r < 0)
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log_error_errno(r, "failed: %m");
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else {
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log_info("→ %s", p);
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if (arg_open)
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assert(fd >= 0);
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else
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assert(fd == -1);
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}
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}
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return 0;
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}
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DEFINE_MAIN_FUNCTION(run);
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