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-rw-r--r--branch.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/branch.c b/branch.c
new file mode 100644
index 000000000..daf862e72
--- /dev/null
+++ b/branch.c
@@ -0,0 +1,152 @@
+#include "cache.h"
+#include "branch.h"
+#include "refs.h"
+#include "remote.h"
+#include "commit.h"
+
+struct tracking {
+ struct refspec spec;
+ char *src;
+ const char *remote;
+ int matches;
+};
+
+static int find_tracked_branch(struct remote *remote, void *priv)
+{
+ struct tracking *tracking = priv;
+
+ if (!remote_find_tracking(remote, &tracking->spec)) {
+ if (++tracking->matches == 1) {
+ tracking->src = tracking->spec.src;
+ tracking->remote = remote->name;
+ } else {
+ free(tracking->spec.src);
+ if (tracking->src) {
+ free(tracking->src);
+ tracking->src = NULL;
+ }
+ }
+ tracking->spec.src = NULL;
+ }
+
+ return 0;
+}
+
+/*
+ * This is called when new_ref is branched off of orig_ref, and tries
+ * to infer the settings for branch.<new_ref>.{remote,merge} from the
+ * config.
+ */
+static int setup_tracking(const char *new_ref, const char *orig_ref,
+ enum branch_track track)
+{
+ char key[1024];
+ struct tracking tracking;
+
+ if (strlen(new_ref) > 1024 - 7 - 7 - 1)
+ return error("Tracking not set up: name too long: %s",
+ new_ref);
+
+ memset(&tracking, 0, sizeof(tracking));
+ tracking.spec.dst = (char *)orig_ref;
+ if (for_each_remote(find_tracked_branch, &tracking))
+ return 1;
+
+ if (!tracking.matches)
+ switch (track) {
+ case BRANCH_TRACK_ALWAYS:
+ case BRANCH_TRACK_EXPLICIT:
+ break;
+ default:
+ return 1;
+ }
+
+ if (tracking.matches > 1)
+ return error("Not tracking: ambiguous information for ref %s",
+ orig_ref);
+
+ sprintf(key, "branch.%s.remote", new_ref);
+ git_config_set(key, tracking.remote ? tracking.remote : ".");
+ sprintf(key, "branch.%s.merge", new_ref);
+ git_config_set(key, tracking.src ? tracking.src : orig_ref);
+ free(tracking.src);
+ printf("Branch %s set up to track %s branch %s.\n", new_ref,
+ tracking.remote ? "remote" : "local", orig_ref);
+
+ return 0;
+}
+
+void create_branch(const char *head,
+ const char *name, const char *start_name,
+ int force, int reflog, enum branch_track track)
+{
+ struct ref_lock *lock;
+ struct commit *commit;
+ unsigned char sha1[20];
+ char *real_ref, ref[PATH_MAX], msg[PATH_MAX + 20];
+ int forcing = 0;
+
+ snprintf(ref, sizeof ref, "refs/heads/%s", name);
+ if (check_ref_format(ref))
+ die("'%s' is not a valid branch name.", name);
+
+ if (resolve_ref(ref, sha1, 1, NULL)) {
+ if (!force)
+ die("A branch named '%s' already exists.", name);
+ else if (!is_bare_repository() && !strcmp(head, name))
+ die("Cannot force update the current branch.");
+ forcing = 1;
+ }
+
+ real_ref = NULL;
+ if (get_sha1(start_name, sha1))
+ die("Not a valid object name: '%s'.", start_name);
+
+ switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
+ case 0:
+ /* Not branching from any existing branch */
+ if (track == BRANCH_TRACK_EXPLICIT)
+ die("Cannot setup tracking information; starting point is not a branch.");
+ break;
+ case 1:
+ /* Unique completion -- good */
+ break;
+ default:
+ die("Ambiguous object name: '%s'.", start_name);
+ break;
+ }
+
+ if ((commit = lookup_commit_reference(sha1)) == NULL)
+ die("Not a valid branch point: '%s'.", start_name);
+ hashcpy(sha1, commit->object.sha1);
+
+ lock = lock_any_ref_for_update(ref, NULL, 0);
+ if (!lock)
+ die("Failed to lock ref for update: %s.", strerror(errno));
+
+ if (reflog)
+ log_all_ref_updates = 1;
+
+ if (forcing)
+ snprintf(msg, sizeof msg, "branch: Reset from %s",
+ start_name);
+ else
+ snprintf(msg, sizeof msg, "branch: Created from %s",
+ start_name);
+
+ if (real_ref && track)
+ setup_tracking(name, real_ref, track);
+
+ if (write_ref_sha1(lock, sha1, msg) < 0)
+ die("Failed to write ref: %s.", strerror(errno));
+
+ free(real_ref);
+}
+
+void remove_branch_state(void)
+{
+ unlink(git_path("MERGE_HEAD"));
+ unlink(git_path("rr-cache/MERGE_RR"));
+ unlink(git_path("MERGE_MSG"));
+ unlink(git_path("SQUASH_MSG"));
+}