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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <stdbool.h>
#include <stddef.h>
#include "env-util.h"
#include "log.h"
#include "macro.h"
#include "process-util.h"
#include "string-util.h"
#include "strv.h"
#include "verbs.h"
#include "virt.h"
/* Wraps running_in_chroot() which is used in various places, but also adds an environment variable check
* so external processes can reliably force this on. */
bool running_in_chroot_or_offline(void) {
int r;
/* Added to support use cases like rpm-ostree, where from %post scripts we only want to execute "preset",
* but not "start"/"restart" for example.
*
* See docs/ENVIRONMENT.md for docs.
*/
r = getenv_bool("SYSTEMD_OFFLINE");
if (r >= 0)
return r > 0;
if (r != -ENXIO)
log_debug_errno(r, "Failed to parse $SYSTEMD_OFFLINE, ignoring: %m");
/* We've had this condition check for a long time which basically checks for legacy chroot case like Fedora's
* "mock", which is used for package builds. We don't want to try to start systemd services there, since
* without --new-chroot we don't even have systemd running, and even if we did, adding a concept of background
* daemons to builds would be an enormous change, requiring considering things like how the journal output is
* handled, etc. And there's really not a use case today for a build talking to a service.
*
* Note this call itself also looks for a different variable SYSTEMD_IGNORE_CHROOT=1.
*/
r = running_in_chroot();
if (r < 0)
log_debug_errno(r, "Failed to check if we're running in chroot, assuming not: %m");
return r > 0;
}
const Verb* verbs_find_verb(const char *name, const Verb verbs[]) {
assert(verbs);
for (size_t i = 0; verbs[i].dispatch; i++)
if (name ? streq(name, verbs[i].verb) : FLAGS_SET(verbs[i].flags, VERB_DEFAULT))
return verbs + i;
/* At the end of the list? */
return NULL;
}
int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) {
const Verb *verb;
const char *name;
int r, left;
assert(verbs);
assert(verbs[0].dispatch);
assert(verbs[0].verb);
assert(argc >= 0);
assert(argv);
assert(argc >= optind);
left = argc - optind;
argv += optind;
optind = 0;
name = argv[0];
verb = verbs_find_verb(name, verbs);
if (!verb) {
_cleanup_strv_free_ char **verb_strv = NULL;
for (size_t i = 0; verbs[i].dispatch; i++) {
r = strv_extend(&verb_strv, verbs[i].verb);
if (r < 0)
return log_oom();
}
if (name) {
/* Be more helpful to the user, and give a hint what the user might have wanted to type. */
const char *found = strv_find_closest(verb_strv, name);
if (found)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown command verb '%s', did you mean '%s'?", name, found);
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command verb '%s'.", name);
}
if (strv_length(verb_strv) >= 2) {
_cleanup_free_ char *joined = strv_join(verb_strv, ", ");
if (!joined)
return log_oom();
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Command verb required (one of %s).", joined);
}
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Command verb '%s' required.", verbs[0].verb);
}
if (!name)
left = 1;
if (verb->min_args != VERB_ANY &&
(unsigned) left < verb->min_args)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too few arguments.");
if (verb->max_args != VERB_ANY &&
(unsigned) left > verb->max_args)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too many arguments.");
if ((verb->flags & VERB_ONLINE_ONLY) && running_in_chroot_or_offline()) {
log_info("Running in chroot, ignoring command '%s'", name ?: verb->verb);
return 0;
}
if (!name)
return verb->dispatch(1, STRV_MAKE(verb->verb), userdata);
return verb->dispatch(left, argv, userdata);
}
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