diff options
Diffstat (limited to 'branch.c')
| -rw-r--r-- | branch.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/branch.c b/branch.c new file mode 100644 index 0000000000..d013374e5a --- /dev/null +++ b/branch.c @@ -0,0 +1,401 @@ +#include "git-compat-util.h" +#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 = NULL; + struct strbuf key = STRBUF_INIT; + int rebasing = should_setup_rebase(origin); + + if (skip_prefix(remote, "refs/heads/", &shortname) + && !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 (shortname) { + if (origin) + printf_ln(rebasing ? + _("Branch %s set up to track remote branch %s from %s by rebasing.") : + _("Branch %s set up to track remote branch %s from %s."), + local, shortname, origin); + else + printf_ln(rebasing ? + _("Branch %s set up to track local branch %s by rebasing.") : + _("Branch %s set up to track local branch %s."), + local, shortname); + } else { + if (origin) + printf_ln(rebasing ? + _("Branch %s set up to track remote ref %s by rebasing.") : + _("Branch %s set up to track remote ref %s."), + local, remote); + else + printf_ln(rebasing ? + _("Branch %s set up to track local ref %s by rebasing.") : + _("Branch %s set up to track local ref %s."), + local, remote); + } + } +} + +/* + * 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; + + 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; +} + +int read_branch_desc(struct strbuf *buf, const char *branch_name) +{ + char *v = NULL; + struct strbuf name = STRBUF_INIT; + strbuf_addf(&name, "branch.%s.description", branch_name); + if (git_config_get_string(name.buf, &v)) { + strbuf_release(&name); + return -1; + } + strbuf_addstr(buf, v); + free(v); + 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", 0, sha1, NULL); + if (!is_bare_repository() && head && !strcmp(head, ref->buf)) + die(_("Cannot force update the current branch.")); + } + return 1; +} + +static int check_tracking_branch(struct remote *remote, void *cb_data) +{ + char *tracking_branch = cb_data; + struct refspec query; + memset(&query, 0, sizeof(struct refspec)); + query.dst = tracking_branch; + return !remote_find_tracking(remote, &query); +} + +static int validate_remote_tracking_branch(char *ref) +{ + return !for_each_remote(check_tracking_branch, ref); +} + +static const char upstream_not_branch[] = +N_("Cannot setup tracking information; starting point '%s' is not a branch."); +static const char upstream_missing[] = +N_("the requested upstream branch '%s' does not exist"); +static const char upstream_advice[] = +N_("\n" +"If you are planning on basing your work on an upstream\n" +"branch that already exists at the remote, you may need to\n" +"run \"git fetch\" to retrieve it.\n" +"\n" +"If you are planning to push out a new local branch that\n" +"will track its remote counterpart, you may want to use\n" +"\"git push -u\" to set the upstream config as you push."); + +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 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)) { + if (explicit_tracking) { + if (advice_set_upstream_failure) { + error(_(upstream_missing), start_name); + advise(_(upstream_advice)); + exit(1); + } + die(_(upstream_missing), start_name); + } + 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(_(upstream_not_branch), start_name); + break; + case 1: + /* Unique completion -- good, only if it is a real branch */ + if (!starts_with(real_ref, "refs/heads/") && + validate_remote_tracking_branch(real_ref)) { + if (explicit_tracking) + die(_(upstream_not_branch), start_name); + 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 (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 (reflog) + log_all_ref_updates = 1; + + if (!dont_change_ref) { + struct ref_transaction *transaction; + struct strbuf err = STRBUF_INIT; + + transaction = ref_transaction_begin(&err); + if (!transaction || + ref_transaction_update(transaction, ref.buf, + sha1, forcing ? NULL : null_sha1, + 0, msg, &err) || + ref_transaction_commit(transaction, &err)) + die("%s", err.buf); + ref_transaction_free(transaction); + strbuf_release(&err); + } + + if (real_ref && track) + setup_tracking(ref.buf + 11, real_ref, track, quiet); + + 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()); +} + +static char *find_linked_symref(const char *symref, const char *branch, + const char *id) +{ + struct strbuf sb = STRBUF_INIT; + struct strbuf path = STRBUF_INIT; + struct strbuf gitdir = STRBUF_INIT; + char *existing = NULL; + + /* + * $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside + * $GIT_DIR so resolve_ref_unsafe() won't work (it uses + * git_path). Parse the ref ourselves. + */ + if (id) + strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(), id, symref); + else + strbuf_addf(&path, "%s/%s", get_git_common_dir(), symref); + + if (!strbuf_readlink(&sb, path.buf, 0)) { + if (!starts_with(sb.buf, "refs/") || + check_refname_format(sb.buf, 0)) + goto done; + } else if (strbuf_read_file(&sb, path.buf, 0) >= 0 && + starts_with(sb.buf, "ref:")) { + strbuf_remove(&sb, 0, strlen("ref:")); + strbuf_trim(&sb); + } else + goto done; + if (strcmp(sb.buf, branch)) + goto done; + if (id) { + strbuf_reset(&path); + strbuf_addf(&path, "%s/worktrees/%s/gitdir", get_git_common_dir(), id); + if (strbuf_read_file(&gitdir, path.buf, 0) <= 0) + goto done; + strbuf_rtrim(&gitdir); + } else + strbuf_addstr(&gitdir, get_git_common_dir()); + strbuf_strip_suffix(&gitdir, ".git"); + + existing = strbuf_detach(&gitdir, NULL); +done: + strbuf_release(&path); + strbuf_release(&sb); + strbuf_release(&gitdir); + + return existing; +} + +char *find_shared_symref(const char *symref, const char *target) +{ + struct strbuf path = STRBUF_INIT; + DIR *dir; + struct dirent *d; + char *existing; + + if ((existing = find_linked_symref(symref, target, NULL))) + return existing; + + strbuf_addf(&path, "%s/worktrees", get_git_common_dir()); + dir = opendir(path.buf); + strbuf_release(&path); + if (!dir) + return NULL; + + while ((d = readdir(dir)) != NULL) { + if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) + continue; + existing = find_linked_symref(symref, target, d->d_name); + if (existing) + goto done; + } +done: + closedir(dir); + + return existing; +} + +void die_if_checked_out(const char *branch) +{ + char *existing; + + existing = find_shared_symref("HEAD", branch); + if (existing) { + skip_prefix(branch, "refs/heads/", &branch); + die(_("'%s' is already checked out at '%s'"), branch, existing); + } +} |