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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "alloc-util.h"
#include "mkdir.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "special.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
#include "util.h"
static char *arg_default_unit = NULL;
static const char *arg_dest = "/tmp";
static char **arg_mask = NULL;
static char **arg_wants = NULL;
static bool arg_debug_shell = false;
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
int r;
assert(key);
if (streq(key, "systemd.mask")) {
char *n;
if (proc_cmdline_value_missing(key, value))
return 0;
r = unit_name_mangle(value, UNIT_NAME_MANGLE_WARN, &n);
if (r < 0)
return log_error_errno(r, "Failed to glob unit name: %m");
r = strv_consume(&arg_mask, n);
if (r < 0)
return log_oom();
} else if (streq(key, "systemd.wants")) {
char *n;
if (proc_cmdline_value_missing(key, value))
return 0;
r = unit_name_mangle(value, UNIT_NAME_MANGLE_WARN, &n);
if (r < 0)
return log_error_errno(r, "Failed to glob unit name: %m");
r = strv_consume(&arg_wants, n);
if (r < 0)
return log_oom();
} else if (proc_cmdline_key_streq(key, "systemd.debug_shell")) {
if (value) {
r = parse_boolean(value);
if (r < 0)
log_error("Failed to parse systemd.debug_shell= argument '%s', ignoring.", value);
else
arg_debug_shell = r;
} else
arg_debug_shell = true;
} else if (streq(key, "systemd.unit")) {
if (proc_cmdline_value_missing(key, value))
return 0;
r = free_and_strdup(&arg_default_unit, value);
if (r < 0)
return log_error_errno(r, "Failed to set default unit %s: %m", value);
} else if (!value) {
const char *target;
target = runlevel_to_target(key);
if (target) {
r = free_and_strdup(&arg_default_unit, target);
if (r < 0)
return log_error_errno(r, "Failed to set default unit %s: %m", target);
}
}
return 0;
}
static int generate_mask_symlinks(void) {
char **u;
int r = 0;
if (strv_isempty(arg_mask))
return 0;
STRV_FOREACH(u, arg_mask) {
_cleanup_free_ char *p = NULL;
p = strjoin(arg_dest, "/", *u);
if (!p)
return log_oom();
if (symlink("/dev/null", p) < 0)
r = log_error_errno(errno,
"Failed to create mask symlink %s: %m",
p);
}
return r;
}
static int generate_wants_symlinks(void) {
char **u;
int r = 0;
if (strv_isempty(arg_wants))
return 0;
STRV_FOREACH(u, arg_wants) {
_cleanup_free_ char *p = NULL, *f = NULL;
const char *target = arg_default_unit ?: SPECIAL_DEFAULT_TARGET;
p = strjoin(arg_dest, "/", target, ".wants/", *u);
if (!p)
return log_oom();
f = strappend(SYSTEM_DATA_UNIT_PATH "/", *u);
if (!f)
return log_oom();
mkdir_parents_label(p, 0755);
if (symlink(f, p) < 0)
r = log_error_errno(errno,
"Failed to create wants symlink %s: %m",
p);
}
return r;
}
int main(int argc, char *argv[]) {
int r, q;
if (argc > 1 && argc != 4) {
log_error("This program takes three or no arguments.");
return EXIT_FAILURE;
}
if (argc > 1)
arg_dest = argv[2];
log_set_prohibit_ipc(true);
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
if (r < 0)
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
if (arg_debug_shell) {
r = strv_extend(&arg_wants, "debug-shell.service");
if (r < 0) {
r = log_oom();
goto finish;
}
}
r = generate_mask_symlinks();
q = generate_wants_symlinks();
if (q < 0)
r = q;
finish:
arg_default_unit = mfree(arg_default_unit);
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
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