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-rw-r--r--src/shared/verbs.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/src/shared/verbs.c b/src/shared/verbs.c
new file mode 100644
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--- /dev/null
+++ b/src/shared/verbs.c
@@ -0,0 +1,112 @@
+/* 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 "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 && r != -ENXIO)
+ log_debug_errno(r, "Failed to parse $SYSTEMD_OFFLINE: %m");
+ else if (r >= 0)
+ return r > 0;
+
+ /* 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, "running_in_chroot(): %m");
+
+ return r > 0;
+}
+
+const Verb* verbs_find_verb(const char *name, const Verb verbs[]) {
+ for (size_t i = 0; verbs[i].dispatch; i++)
+ if (streq_ptr(name, verbs[i].verb) ||
+ (!name && 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 left;
+
+ assert(verbs);
+ assert(verbs[0].dispatch);
+ 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) {
+ if (name)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Unknown command verb %s.", name);
+ else
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Command verb required.");
+ }
+
+ 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(left, argv, userdata);
+ else {
+ char* fake[2] = {
+ (char*) verb->verb,
+ NULL
+ };
+
+ return verb->dispatch(1, fake, userdata);
+ }
+}