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![Jeff King](/assets/img/avatar_default.png)
If we refuse a branch operation because the tracking start_name the user gave us is bogus, we just print something like: fatal: Cannot setup tracking information; start point is not a branch If we mention the actual name we tried to use, that may help the user figure out why it didn't work (e.g., if they gave us the arguments in the wrong order). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
300 lines
7.5 KiB
C
300 lines
7.5 KiB
C
#include "cache.h"
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#include "branch.h"
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#include "refs.h"
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#include "remote.h"
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#include "commit.h"
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struct tracking {
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struct refspec spec;
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char *src;
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const char *remote;
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int matches;
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};
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static int find_tracked_branch(struct remote *remote, void *priv)
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{
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struct tracking *tracking = priv;
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if (!remote_find_tracking(remote, &tracking->spec)) {
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if (++tracking->matches == 1) {
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tracking->src = tracking->spec.src;
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tracking->remote = remote->name;
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} else {
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free(tracking->spec.src);
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if (tracking->src) {
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free(tracking->src);
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tracking->src = NULL;
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}
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}
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tracking->spec.src = NULL;
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}
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return 0;
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}
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static int should_setup_rebase(const char *origin)
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{
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switch (autorebase) {
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case AUTOREBASE_NEVER:
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return 0;
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case AUTOREBASE_LOCAL:
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return origin == NULL;
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case AUTOREBASE_REMOTE:
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return origin != NULL;
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case AUTOREBASE_ALWAYS:
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return 1;
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}
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return 0;
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}
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void install_branch_config(int flag, const char *local, const char *origin, const char *remote)
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{
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const char *shortname = remote + 11;
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int remote_is_branch = !prefixcmp(remote, "refs/heads/");
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struct strbuf key = STRBUF_INIT;
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int rebasing = should_setup_rebase(origin);
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if (remote_is_branch
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&& !strcmp(local, shortname)
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&& !origin) {
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warning("Not setting branch %s as its own upstream.",
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local);
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return;
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}
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strbuf_addf(&key, "branch.%s.remote", local);
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git_config_set(key.buf, origin ? origin : ".");
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strbuf_reset(&key);
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strbuf_addf(&key, "branch.%s.merge", local);
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git_config_set(key.buf, remote);
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if (rebasing) {
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strbuf_reset(&key);
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strbuf_addf(&key, "branch.%s.rebase", local);
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git_config_set(key.buf, "true");
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}
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strbuf_release(&key);
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if (flag & BRANCH_CONFIG_VERBOSE) {
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if (remote_is_branch && origin)
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printf(rebasing ?
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"Branch %s set up to track remote branch %s from %s by rebasing.\n" :
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"Branch %s set up to track remote branch %s from %s.\n",
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local, shortname, origin);
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else if (remote_is_branch && !origin)
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printf(rebasing ?
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"Branch %s set up to track local branch %s by rebasing.\n" :
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"Branch %s set up to track local branch %s.\n",
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local, shortname);
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else if (!remote_is_branch && origin)
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printf(rebasing ?
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"Branch %s set up to track remote ref %s by rebasing.\n" :
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"Branch %s set up to track remote ref %s.\n",
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local, remote);
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else if (!remote_is_branch && !origin)
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printf(rebasing ?
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"Branch %s set up to track local ref %s by rebasing.\n" :
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"Branch %s set up to track local ref %s.\n",
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local, remote);
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else
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die("BUG: impossible combination of %d and %p",
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remote_is_branch, origin);
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}
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}
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/*
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* This is called when new_ref is branched off of orig_ref, and tries
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* to infer the settings for branch.<new_ref>.{remote,merge} from the
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* config.
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*/
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static int setup_tracking(const char *new_ref, const char *orig_ref,
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enum branch_track track, int quiet)
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{
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struct tracking tracking;
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int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
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if (strlen(new_ref) > 1024 - 7 - 7 - 1)
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return error("Tracking not set up: name too long: %s",
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new_ref);
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memset(&tracking, 0, sizeof(tracking));
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tracking.spec.dst = (char *)orig_ref;
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if (for_each_remote(find_tracked_branch, &tracking))
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return 1;
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if (!tracking.matches)
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switch (track) {
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case BRANCH_TRACK_ALWAYS:
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case BRANCH_TRACK_EXPLICIT:
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case BRANCH_TRACK_OVERRIDE:
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break;
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default:
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return 1;
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}
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if (tracking.matches > 1)
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return error("Not tracking: ambiguous information for ref %s",
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orig_ref);
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install_branch_config(config_flags, new_ref, tracking.remote,
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tracking.src ? tracking.src : orig_ref);
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free(tracking.src);
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return 0;
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}
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struct branch_desc_cb {
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const char *config_name;
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const char *value;
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};
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static int read_branch_desc_cb(const char *var, const char *value, void *cb)
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{
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struct branch_desc_cb *desc = cb;
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if (strcmp(desc->config_name, var))
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return 0;
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free((char *)desc->value);
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return git_config_string(&desc->value, var, value);
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}
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int read_branch_desc(struct strbuf *buf, const char *branch_name)
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{
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struct branch_desc_cb cb;
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struct strbuf name = STRBUF_INIT;
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strbuf_addf(&name, "branch.%s.description", branch_name);
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cb.config_name = name.buf;
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cb.value = NULL;
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if (git_config(read_branch_desc_cb, &cb) < 0) {
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strbuf_release(&name);
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return -1;
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}
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if (cb.value)
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strbuf_addstr(buf, cb.value);
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strbuf_release(&name);
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return 0;
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}
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int validate_new_branchname(const char *name, struct strbuf *ref,
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int force, int attr_only)
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{
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if (strbuf_check_branch_ref(ref, name))
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die("'%s' is not a valid branch name.", name);
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if (!ref_exists(ref->buf))
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return 0;
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else if (!force && !attr_only)
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die("A branch named '%s' already exists.", ref->buf + strlen("refs/heads/"));
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if (!attr_only) {
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const char *head;
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unsigned char sha1[20];
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head = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
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if (!is_bare_repository() && head && !strcmp(head, ref->buf))
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die("Cannot force update the current branch.");
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}
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return 1;
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}
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static const char upstream_not_branch[] =
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N_("Cannot setup tracking information; starting point '%s' is not a branch.");
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static const char upstream_missing[] =
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N_("Cannot setup tracking information; starting point '%s' does not exist");
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void create_branch(const char *head,
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const char *name, const char *start_name,
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int force, int reflog, int clobber_head,
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int quiet, enum branch_track track)
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{
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struct ref_lock *lock = NULL;
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struct commit *commit;
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unsigned char sha1[20];
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char *real_ref, msg[PATH_MAX + 20];
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struct strbuf ref = STRBUF_INIT;
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int forcing = 0;
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int dont_change_ref = 0;
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int explicit_tracking = 0;
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if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
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explicit_tracking = 1;
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if (validate_new_branchname(name, &ref, force,
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track == BRANCH_TRACK_OVERRIDE ||
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clobber_head)) {
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if (!force)
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dont_change_ref = 1;
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else
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forcing = 1;
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}
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real_ref = NULL;
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if (get_sha1(start_name, sha1)) {
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if (explicit_tracking)
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die(_(upstream_missing), start_name);
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die("Not a valid object name: '%s'.", start_name);
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}
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switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
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case 0:
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/* Not branching from any existing branch */
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if (explicit_tracking)
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die(_(upstream_not_branch), start_name);
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break;
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case 1:
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/* Unique completion -- good, only if it is a real branch */
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if (prefixcmp(real_ref, "refs/heads/") &&
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prefixcmp(real_ref, "refs/remotes/")) {
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if (explicit_tracking)
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die(_(upstream_not_branch), start_name);
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else
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real_ref = NULL;
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}
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break;
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default:
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die("Ambiguous object name: '%s'.", start_name);
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break;
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}
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if ((commit = lookup_commit_reference(sha1)) == NULL)
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die("Not a valid branch point: '%s'.", start_name);
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hashcpy(sha1, commit->object.sha1);
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if (!dont_change_ref) {
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lock = lock_any_ref_for_update(ref.buf, NULL, 0);
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if (!lock)
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die_errno("Failed to lock ref for update");
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}
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if (reflog)
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log_all_ref_updates = 1;
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if (forcing)
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snprintf(msg, sizeof msg, "branch: Reset to %s",
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start_name);
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else if (!dont_change_ref)
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snprintf(msg, sizeof msg, "branch: Created from %s",
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start_name);
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if (real_ref && track)
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setup_tracking(ref.buf+11, real_ref, track, quiet);
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if (!dont_change_ref)
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if (write_ref_sha1(lock, sha1, msg) < 0)
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die_errno("Failed to write ref");
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strbuf_release(&ref);
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free(real_ref);
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}
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void remove_branch_state(void)
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{
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unlink(git_path("CHERRY_PICK_HEAD"));
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unlink(git_path("REVERT_HEAD"));
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unlink(git_path("MERGE_HEAD"));
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unlink(git_path("MERGE_RR"));
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unlink(git_path("MERGE_MSG"));
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unlink(git_path("MERGE_MODE"));
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unlink(git_path("SQUASH_MSG"));
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}
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