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![Jeff King](/assets/img/avatar_default.png)
If we are trying to set the upstream config for a branch, the create_branch function will check both that the name resolves as a ref, and that it is either a local or remote-tracking branch. However, before we do so we run get_sha1 on it to find out whether it resolves at all (since the create_branch function is also used to create actual branches, it wants to know where to start the new branch). This means that if you feed a ref that does not exist to "branch --set-upstream-to", rather than getting a helpful message about tracking, you only get "not a valid object name". 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 is not a branch.");
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static const char upstream_missing[] =
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N_("Cannot setup tracking information; starting point 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));
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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));
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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));
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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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