134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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***/
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#include <errno.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include "env-util.h"
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#include "log.h"
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#include "macro.h"
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#include "process-util.h"
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#include "string-util.h"
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#include "verbs.h"
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#include "virt.h"
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/* Wraps running_in_chroot() which is used in various places, but also adds an environment variable check so external
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* processes can reliably force this on.
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*/
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bool running_in_chroot_or_offline(void) {
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int r;
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/* Added to support use cases like rpm-ostree, where from %post scripts we only want to execute "preset", but
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* not "start"/"restart" for example.
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*
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* See doc/ENVIRONMENT.md for docs.
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*/
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r = getenv_bool("SYSTEMD_OFFLINE");
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if (r < 0 && r != -ENXIO)
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log_debug_errno(r, "Failed to parse $SYSTEMD_OFFLINE: %m");
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else if (r >= 0)
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return r > 0;
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/* We've had this condition check for a long time which basically checks for legacy chroot case like Fedora's
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* "mock", which is used for package builds. We don't want to try to start systemd services there, since
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* without --new-chroot we don't even have systemd running, and even if we did, adding a concept of background
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* daemons to builds would be an enormous change, requiring considering things like how the journal output is
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* handled, etc. And there's really not a use case today for a build talking to a service.
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*
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* Note this call itself also looks for a different variable SYSTEMD_IGNORE_CHROOT=1.
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*/
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r = running_in_chroot();
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if (r < 0)
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log_debug_errno(r, "running_in_chroot(): %m");
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return r > 0;
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}
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int dispatch_verb(int argc, char *argv[], const Verb verbs[], void *userdata) {
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const Verb *verb;
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const char *name;
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unsigned i;
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int left, r;
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assert(verbs);
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assert(verbs[0].dispatch);
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assert(argc >= 0);
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assert(argv);
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assert(argc >= optind);
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left = argc - optind;
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name = argv[optind];
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for (i = 0;; i++) {
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bool found;
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/* At the end of the list? */
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if (!verbs[i].dispatch) {
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if (name)
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log_error("Unknown operation %s.", name);
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else
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log_error("Requires operation parameter.");
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return -EINVAL;
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}
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if (name)
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found = streq(name, verbs[i].verb);
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else
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found = verbs[i].flags & VERB_DEFAULT;
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if (found) {
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verb = &verbs[i];
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break;
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}
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}
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assert(verb);
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if (!name)
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left = 1;
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if (verb->min_args != VERB_ANY &&
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(unsigned) left < verb->min_args) {
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log_error("Too few arguments.");
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return -EINVAL;
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}
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if (verb->max_args != VERB_ANY &&
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(unsigned) left > verb->max_args) {
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log_error("Too many arguments.");
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return -EINVAL;
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}
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if ((verb->flags & VERB_ONLINE_ONLY) && running_in_chroot_or_offline()) {
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if (name)
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log_info("Running in chroot, ignoring request: %s", name);
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else
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log_info("Running in chroot, ignoring request.");
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return 0;
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}
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if (verb->flags & VERB_MUST_BE_ROOT) {
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r = must_be_root();
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if (r < 0)
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return r;
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}
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if (name)
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return verb->dispatch(left, argv + optind, userdata);
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else {
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char* fake[2] = {
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(char*) verb->verb,
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NULL
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};
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return verb->dispatch(1, fake, userdata);
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}
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}
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