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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "generator.h"
#include "initrd-util.h"
#include "log.h"
#include "mkdir-label.h"
#include "string-util.h"
static const char *arg_dest = NULL;
/* So you are reading this, and might wonder: why is this implemented as a generator rather than as a plain, statically
* enabled service that carries appropriate ConditionFileIsExecutable= lines? The answer is this: conditions bypass
* execution of a service's binary, but they have no influence on unit dependencies. Thus, a service that is
* conditioned out will still act as synchronization point in the dependency tree, and we'd rather not have that for
* these two legacy scripts. */
static int add_symlink(const char *service, const char *where) {
const char *from, *to;
assert(service);
assert(where);
from = strjoina(SYSTEM_DATA_UNIT_DIR "/", service);
to = strjoina(arg_dest, "/", where, ".wants/", service);
(void) mkdir_parents_label(to, 0755);
if (symlink(from, to) < 0) {
if (errno == EEXIST)
return 0;
return log_error_errno(errno, "Failed to create symlink %s: %m", to);
}
return 1;
}
static int check_executable(const char *path) {
assert(path);
if (access(path, X_OK) < 0) {
if (errno == ENOENT)
return log_debug_errno(errno, "%s does not exist, skipping.", path);
if (errno == EACCES)
return log_info_errno(errno, "%s is not marked executable, skipping.", path);
return log_warning_errno(errno, "Couldn't determine if %s exists and is executable, skipping: %m", path);
}
return 0;
}
static int run(const char *dest, const char *dest_early, const char *dest_late) {
int r = 0, k = 0;
assert_se(arg_dest = dest);
if (in_initrd()) {
log_debug("Skipping generator, running in the initrd.");
return EXIT_SUCCESS;
}
if (check_executable(RC_LOCAL_PATH) >= 0) {
log_debug("Automatically adding rc-local.service.");
r = add_symlink("rc-local.service", "multi-user.target");
}
return r < 0 ? r : k;
}
DEFINE_MAIN_GENERATOR_FUNCTION(run);
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