diff options
Diffstat (limited to 'branch.c')
| -rw-r--r-- | branch.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/branch.c b/branch.c new file mode 100644 index 0000000000..daf862e728 --- /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")); +} |