diff options
Diffstat (limited to 'branch.c')
| -rw-r--r-- | branch.c | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/branch.c b/branch.c new file mode 100644 index 0000000..5794947 --- /dev/null +++ b/branch.c @@ -0,0 +1,393 @@ +#include "git-compat-util.h" +#include "cache.h" +#include "config.h" +#include "branch.h" +#include "refs.h" +#include "refspec.h" +#include "remote.h" +#include "sequencer.h" +#include "commit.h" +#include "worktree.h" + +struct tracking { + struct refspec_item 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); + FREE_AND_NULL(tracking->src); + } + 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; +} + +static const char tracking_advice[] = +N_("\n" +"After fixing the error cause you may try to fix up\n" +"the remote tracking information by invoking\n" +"\"git branch --set-upstream-to=%s%s%s\"."); + +int 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 0; + } + + strbuf_addf(&key, "branch.%s.remote", local); + if (git_config_set_gently(key.buf, origin ? origin : ".") < 0) + goto out_err; + + strbuf_reset(&key); + strbuf_addf(&key, "branch.%s.merge", local); + if (git_config_set_gently(key.buf, remote) < 0) + goto out_err; + + if (rebasing) { + strbuf_reset(&key); + strbuf_addf(&key, "branch.%s.rebase", local); + if (git_config_set_gently(key.buf, "true") < 0) + goto out_err; + } + 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); + } + } + + return 0; + +out_err: + strbuf_release(&key); + error(_("Unable to write upstream branch configuration")); + + advise(_(tracking_advice), + origin ? origin : "", + origin ? "/" : "", + shortname ? shortname : remote); + + return -1; +} + +/* + * 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 void 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; + + if (!tracking.matches) + switch (track) { + case BRANCH_TRACK_ALWAYS: + case BRANCH_TRACK_EXPLICIT: + case BRANCH_TRACK_OVERRIDE: + break; + default: + return; + } + + if (tracking.matches > 1) + die(_("Not tracking: ambiguous information for ref %s"), + orig_ref); + + if (install_branch_config(config_flags, new_ref, tracking.remote, + tracking.src ? tracking.src : orig_ref) < 0) + exit(-1); + + free(tracking.src); +} + +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; +} + +/* + * Check if 'name' can be a valid name for a branch; die otherwise. + * Return 1 if the named branch already exists; return 0 otherwise. + * Fill ref with the full refname for the branch. + */ +int validate_branchname(const char *name, struct strbuf *ref) +{ + if (strbuf_check_branch_ref(ref, name)) + die(_("'%s' is not a valid branch name."), name); + + return ref_exists(ref->buf); +} + +/* + * Check if a branch 'name' can be created as a new branch; die otherwise. + * 'force' can be used when it is OK for the named branch already exists. + * Return 1 if the named branch already exists; return 0 otherwise. + * Fill ref with the full refname for the branch. + */ +int validate_new_branchname(const char *name, struct strbuf *ref, int force) +{ + const char *head; + + if (!validate_branchname(name, ref)) + return 0; + + if (!force) + die(_("A branch named '%s' already exists."), + ref->buf + strlen("refs/heads/")); + + head = resolve_ref_unsafe("HEAD", 0, NULL, 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_item query; + memset(&query, 0, sizeof(struct refspec_item)); + 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(struct repository *r, + const char *name, const char *start_name, + int force, int clobber_head_ok, int reflog, + int quiet, enum branch_track track) +{ + struct commit *commit; + struct object_id oid; + char *real_ref; + 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 ((track == BRANCH_TRACK_OVERRIDE || clobber_head_ok) + ? validate_branchname(name, &ref) + : validate_new_branchname(name, &ref, force)) { + if (!force) + dont_change_ref = 1; + else + forcing = 1; + } + + real_ref = NULL; + if (get_oid_mb(start_name, &oid)) { + 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), &oid, &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(r, &oid)) == NULL) + die(_("Not a valid branch point: '%s'."), start_name); + oidcpy(&oid, &commit->object.oid); + + if (reflog) + log_all_ref_updates = LOG_REFS_NORMAL; + + if (!dont_change_ref) { + struct ref_transaction *transaction; + struct strbuf err = STRBUF_INIT; + char *msg; + + if (forcing) + msg = xstrfmt("branch: Reset to %s", start_name); + else + msg = xstrfmt("branch: Created from %s", start_name); + + transaction = ref_transaction_begin(&err); + if (!transaction || + ref_transaction_update(transaction, ref.buf, + &oid, forcing ? NULL : &null_oid, + 0, msg, &err) || + ref_transaction_commit(transaction, &err)) + die("%s", err.buf); + ref_transaction_free(transaction); + strbuf_release(&err); + free(msg); + } + + if (real_ref && track) + setup_tracking(ref.buf + 11, real_ref, track, quiet); + + strbuf_release(&ref); + free(real_ref); +} + +void remove_merge_branch_state(struct repository *r) +{ + unlink(git_path_merge_head(r)); + unlink(git_path_merge_rr(r)); + unlink(git_path_merge_msg(r)); + unlink(git_path_merge_mode(r)); +} + +void remove_branch_state(struct repository *r, int verbose) +{ + sequencer_post_commit_cleanup(r, verbose); + unlink(git_path_squash_msg(r)); + remove_merge_branch_state(r); +} + +void die_if_checked_out(const char *branch, int ignore_current_worktree) +{ + const struct worktree *wt; + + wt = find_shared_symref("HEAD", branch); + if (!wt || (ignore_current_worktree && wt->is_current)) + return; + skip_prefix(branch, "refs/heads/", &branch); + die(_("'%s' is already checked out at '%s'"), + branch, wt->path); +} + +int replace_each_worktree_head_symref(const char *oldref, const char *newref, + const char *logmsg) +{ + int ret = 0; + struct worktree **worktrees = get_worktrees(0); + int i; + + for (i = 0; worktrees[i]; i++) { + struct ref_store *refs; + + if (worktrees[i]->is_detached) + continue; + if (!worktrees[i]->head_ref) + continue; + if (strcmp(oldref, worktrees[i]->head_ref)) + continue; + + refs = get_worktree_ref_store(worktrees[i]); + if (refs_create_symref(refs, "HEAD", newref, logmsg)) + ret = error(_("HEAD of working tree %s is not updated"), + worktrees[i]->path); + } + + free_worktrees(worktrees); + return ret; +} |