diff options
Diffstat (limited to 'branch.c')
| -rw-r--r-- | branch.c | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/branch.c b/branch.c new file mode 100644 index 0000000000..2bef1e7e71 --- /dev/null +++ b/branch.c @@ -0,0 +1,291 @@ +#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; +} + +static int should_setup_rebase(const char *origin) +{ + switch (autorebase) { + case AUTOREBASE_NEVER: + return 0; + case AUTOREBASE_LOCAL: + return origin == NULL; + case AUTOREBASE_REMOTE: + return origin != NULL; + case AUTOREBASE_ALWAYS: + return 1; + } + return 0; +} + +void install_branch_config(int flag, const char *local, const char *origin, const char *remote) +{ + const char *shortname = remote + 11; + int remote_is_branch = !prefixcmp(remote, "refs/heads/"); + struct strbuf key = STRBUF_INIT; + int rebasing = should_setup_rebase(origin); + + if (remote_is_branch + && !strcmp(local, shortname) + && !origin) { + warning("Not setting branch %s as its own upstream.", + local); + return; + } + + strbuf_addf(&key, "branch.%s.remote", local); + git_config_set(key.buf, origin ? origin : "."); + + strbuf_reset(&key); + strbuf_addf(&key, "branch.%s.merge", local); + git_config_set(key.buf, remote); + + if (rebasing) { + strbuf_reset(&key); + strbuf_addf(&key, "branch.%s.rebase", local); + git_config_set(key.buf, "true"); + } + strbuf_release(&key); + + if (flag & BRANCH_CONFIG_VERBOSE) { + if (remote_is_branch && origin) + printf(rebasing ? + "Branch %s set up to track remote branch %s from %s by rebasing.\n" : + "Branch %s set up to track remote branch %s from %s.\n", + local, shortname, origin); + else if (remote_is_branch && !origin) + printf(rebasing ? + "Branch %s set up to track local branch %s by rebasing.\n" : + "Branch %s set up to track local branch %s.\n", + local, shortname); + else if (!remote_is_branch && origin) + printf(rebasing ? + "Branch %s set up to track remote ref %s by rebasing.\n" : + "Branch %s set up to track remote ref %s.\n", + local, remote); + else if (!remote_is_branch && !origin) + printf(rebasing ? + "Branch %s set up to track local ref %s by rebasing.\n" : + "Branch %s set up to track local ref %s.\n", + local, remote); + else + die("BUG: impossible combination of %d and %p", + remote_is_branch, origin); + } +} + +/* + * 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, int quiet) +{ + struct tracking tracking; + int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE; + + 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: + case BRANCH_TRACK_OVERRIDE: + break; + default: + return 1; + } + + if (tracking.matches > 1) + return error("Not tracking: ambiguous information for ref %s", + orig_ref); + + install_branch_config(config_flags, new_ref, tracking.remote, + tracking.src ? tracking.src : orig_ref); + + free(tracking.src); + return 0; +} + +struct branch_desc_cb { + const char *config_name; + const char *value; +}; + +static int read_branch_desc_cb(const char *var, const char *value, void *cb) +{ + struct branch_desc_cb *desc = cb; + if (strcmp(desc->config_name, var)) + return 0; + free((char *)desc->value); + return git_config_string(&desc->value, var, value); +} + +int read_branch_desc(struct strbuf *buf, const char *branch_name) +{ + struct branch_desc_cb cb; + struct strbuf name = STRBUF_INIT; + strbuf_addf(&name, "branch.%s.description", branch_name); + cb.config_name = name.buf; + cb.value = NULL; + if (git_config(read_branch_desc_cb, &cb) < 0) { + strbuf_release(&name); + return -1; + } + if (cb.value) + strbuf_addstr(buf, cb.value); + strbuf_release(&name); + return 0; +} + +int validate_new_branchname(const char *name, struct strbuf *ref, + int force, int attr_only) +{ + if (strbuf_check_branch_ref(ref, name)) + die("'%s' is not a valid branch name.", name); + + if (!ref_exists(ref->buf)) + return 0; + else if (!force && !attr_only) + die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/")); + + if (!attr_only) { + const char *head; + unsigned char sha1[20]; + + head = resolve_ref_unsafe("HEAD", sha1, 0, NULL); + if (!is_bare_repository() && head && !strcmp(head, ref->buf)) + die("Cannot force update the current branch."); + } + return 1; +} + +void create_branch(const char *head, + const char *name, const char *start_name, + int force, int reflog, int clobber_head, + int quiet, enum branch_track track) +{ + struct ref_lock *lock = NULL; + struct commit *commit; + unsigned char sha1[20]; + char *real_ref, msg[PATH_MAX + 20]; + struct strbuf ref = STRBUF_INIT; + int forcing = 0; + int dont_change_ref = 0; + int explicit_tracking = 0; + + if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE) + explicit_tracking = 1; + + if (validate_new_branchname(name, &ref, force, + track == BRANCH_TRACK_OVERRIDE || + clobber_head)) { + if (!force) + dont_change_ref = 1; + else + 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 (explicit_tracking) + die("Cannot setup tracking information; starting point is not a branch."); + break; + case 1: + /* Unique completion -- good, only if it is a real branch */ + if (prefixcmp(real_ref, "refs/heads/") && + prefixcmp(real_ref, "refs/remotes/")) { + if (explicit_tracking) + die("Cannot setup tracking information; starting point is not a branch."); + else + real_ref = NULL; + } + 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); + + if (!dont_change_ref) { + lock = lock_any_ref_for_update(ref.buf, NULL, 0); + if (!lock) + die_errno("Failed to lock ref for update"); + } + + if (reflog) + log_all_ref_updates = 1; + + if (forcing) + snprintf(msg, sizeof msg, "branch: Reset to %s", + start_name); + else if (!dont_change_ref) + snprintf(msg, sizeof msg, "branch: Created from %s", + start_name); + + if (real_ref && track) + setup_tracking(ref.buf+11, real_ref, track, quiet); + + if (!dont_change_ref) + if (write_ref_sha1(lock, sha1, msg) < 0) + die_errno("Failed to write ref"); + + strbuf_release(&ref); + free(real_ref); +} + +void remove_branch_state(void) +{ + unlink(git_path("CHERRY_PICK_HEAD")); + unlink(git_path("REVERT_HEAD")); + unlink(git_path("MERGE_HEAD")); + unlink(git_path("MERGE_RR")); + unlink(git_path("MERGE_MSG")); + unlink(git_path("MERGE_MODE")); + unlink(git_path("SQUASH_MSG")); +} |