103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stdio.h>
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#include "alloc-util.h"
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#include "fstab-util.h"
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#include "generator.h"
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#include "log.h"
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#include "main-func.h"
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#include "mkdir.h"
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#include "proc-cmdline.h"
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#include "special.h"
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#include "string-util.h"
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#include "unit-name.h"
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#include "util.h"
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static const char *arg_dest = "/tmp";
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static char *arg_resume_device = NULL;
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static bool arg_noresume = false;
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STATIC_DESTRUCTOR_REGISTER(arg_resume_device, freep);
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static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
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if (streq(key, "resume")) {
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char *s;
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if (proc_cmdline_value_missing(key, value))
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return 0;
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s = fstab_node_to_udev_node(value);
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if (!s)
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return log_oom();
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free_and_replace(arg_resume_device, s);
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} else if (streq(key, "noresume")) {
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if (value) {
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log_warning("\"noresume\" kernel command line switch specified with an argument, ignoring.");
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return 0;
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}
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arg_noresume = true;
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}
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return 0;
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}
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static int process_resume(void) {
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_cleanup_free_ char *name = NULL, *lnk = NULL;
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int r;
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if (!arg_resume_device)
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return 0;
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r = unit_name_from_path_instance("systemd-hibernate-resume", arg_resume_device, ".service", &name);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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lnk = strjoin(arg_dest, "/" SPECIAL_SYSINIT_TARGET ".wants/", name);
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if (!lnk)
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return log_oom();
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mkdir_parents_label(lnk, 0755);
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if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-hibernate-resume@.service", lnk) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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return 0;
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}
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static int run(int argc, char *argv[]) {
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int r = 0;
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log_setup_generator();
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if (argc > 1 && argc != 4)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"This program takes three or no arguments.");
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if (argc > 1)
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arg_dest = argv[1];
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/* Don't even consider resuming outside of initramfs. */
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if (!in_initrd()) {
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log_debug("Not running in an initrd, quitting.");
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return 0;
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}
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r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
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if (r < 0)
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log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
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if (arg_noresume) {
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log_notice("Found \"noresume\" on the kernel command line, quitting.");
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return 0;
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}
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return process_resume();
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}
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DEFINE_MAIN_FUNCTION(run);
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