Andrew's git / gitweb.git / branch.c
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branch.con commit preparing for 2.10.3 (c3808ca)
   1#include "git-compat-util.h"
   2#include "cache.h"
   3#include "branch.h"
   4#include "refs.h"
   5#include "remote.h"
   6#include "commit.h"
   7#include "worktree.h"
   8
   9struct tracking {
  10        struct refspec spec;
  11        char *src;
  12        const char *remote;
  13        int matches;
  14};
  15
  16static int find_tracked_branch(struct remote *remote, void *priv)
  17{
  18        struct tracking *tracking = priv;
  19
  20        if (!remote_find_tracking(remote, &tracking->spec)) {
  21                if (++tracking->matches == 1) {
  22                        tracking->src = tracking->spec.src;
  23                        tracking->remote = remote->name;
  24                } else {
  25                        free(tracking->spec.src);
  26                        if (tracking->src) {
  27                                free(tracking->src);
  28                                tracking->src = NULL;
  29                        }
  30                }
  31                tracking->spec.src = NULL;
  32        }
  33
  34        return 0;
  35}
  36
  37static int should_setup_rebase(const char *origin)
  38{
  39        switch (autorebase) {
  40        case AUTOREBASE_NEVER:
  41                return 0;
  42        case AUTOREBASE_LOCAL:
  43                return origin == NULL;
  44        case AUTOREBASE_REMOTE:
  45                return origin != NULL;
  46        case AUTOREBASE_ALWAYS:
  47                return 1;
  48        }
  49        return 0;
  50}
  51
  52static const char tracking_advice[] =
  53N_("\n"
  54"After fixing the error cause you may try to fix up\n"
  55"the remote tracking information by invoking\n"
  56"\"git branch --set-upstream-to=%s%s%s\".");
  57
  58int install_branch_config(int flag, const char *local, const char *origin, const char *remote)
  59{
  60        const char *shortname = NULL;
  61        struct strbuf key = STRBUF_INIT;
  62        int rebasing = should_setup_rebase(origin);
  63
  64        if (skip_prefix(remote, "refs/heads/", &shortname)
  65            && !strcmp(local, shortname)
  66            && !origin) {
  67                warning(_("Not setting branch %s as its own upstream."),
  68                        local);
  69                return 0;
  70        }
  71
  72        strbuf_addf(&key, "branch.%s.remote", local);
  73        if (git_config_set_gently(key.buf, origin ? origin : ".") < 0)
  74                goto out_err;
  75
  76        strbuf_reset(&key);
  77        strbuf_addf(&key, "branch.%s.merge", local);
  78        if (git_config_set_gently(key.buf, remote) < 0)
  79                goto out_err;
  80
  81        if (rebasing) {
  82                strbuf_reset(&key);
  83                strbuf_addf(&key, "branch.%s.rebase", local);
  84                if (git_config_set_gently(key.buf, "true") < 0)
  85                        goto out_err;
  86        }
  87        strbuf_release(&key);
  88
  89        if (flag & BRANCH_CONFIG_VERBOSE) {
  90                if (shortname) {
  91                        if (origin)
  92                                printf_ln(rebasing ?
  93                                          _("Branch %s set up to track remote branch %s from %s by rebasing.") :
  94                                          _("Branch %s set up to track remote branch %s from %s."),
  95                                          local, shortname, origin);
  96                        else
  97                                printf_ln(rebasing ?
  98                                          _("Branch %s set up to track local branch %s by rebasing.") :
  99                                          _("Branch %s set up to track local branch %s."),
 100                                          local, shortname);
 101                } else {
 102                        if (origin)
 103                                printf_ln(rebasing ?
 104                                          _("Branch %s set up to track remote ref %s by rebasing.") :
 105                                          _("Branch %s set up to track remote ref %s."),
 106                                          local, remote);
 107                        else
 108                                printf_ln(rebasing ?
 109                                          _("Branch %s set up to track local ref %s by rebasing.") :
 110                                          _("Branch %s set up to track local ref %s."),
 111                                          local, remote);
 112                }
 113        }
 114
 115        return 0;
 116
 117out_err:
 118        strbuf_release(&key);
 119        error(_("Unable to write upstream branch configuration"));
 120
 121        advise(_(tracking_advice),
 122               origin ? origin : "",
 123               origin ? "/" : "",
 124               shortname ? shortname : remote);
 125
 126        return -1;
 127}
 128
 129/*
 130 * This is called when new_ref is branched off of orig_ref, and tries
 131 * to infer the settings for branch.<new_ref>.{remote,merge} from the
 132 * config.
 133 */
 134static void setup_tracking(const char *new_ref, const char *orig_ref,
 135                           enum branch_track track, int quiet)
 136{
 137        struct tracking tracking;
 138        int config_flags = quiet ? 0 : BRANCH_CONFIG_VERBOSE;
 139
 140        memset(&tracking, 0, sizeof(tracking));
 141        tracking.spec.dst = (char *)orig_ref;
 142        if (for_each_remote(find_tracked_branch, &tracking))
 143                return;
 144
 145        if (!tracking.matches)
 146                switch (track) {
 147                case BRANCH_TRACK_ALWAYS:
 148                case BRANCH_TRACK_EXPLICIT:
 149                case BRANCH_TRACK_OVERRIDE:
 150                        break;
 151                default:
 152                        return;
 153                }
 154
 155        if (tracking.matches > 1)
 156                die(_("Not tracking: ambiguous information for ref %s"),
 157                    orig_ref);
 158
 159        if (install_branch_config(config_flags, new_ref, tracking.remote,
 160                              tracking.src ? tracking.src : orig_ref) < 0)
 161                exit(-1);
 162
 163        free(tracking.src);
 164}
 165
 166int read_branch_desc(struct strbuf *buf, const char *branch_name)
 167{
 168        char *v = NULL;
 169        struct strbuf name = STRBUF_INIT;
 170        strbuf_addf(&name, "branch.%s.description", branch_name);
 171        if (git_config_get_string(name.buf, &v)) {
 172                strbuf_release(&name);
 173                return -1;
 174        }
 175        strbuf_addstr(buf, v);
 176        free(v);
 177        strbuf_release(&name);
 178        return 0;
 179}
 180
 181int validate_new_branchname(const char *name, struct strbuf *ref,
 182                            int force, int attr_only)
 183{
 184        if (strbuf_check_branch_ref(ref, name))
 185                die(_("'%s' is not a valid branch name."), name);
 186
 187        if (!ref_exists(ref->buf))
 188                return 0;
 189        else if (!force && !attr_only)
 190                die(_("A branch named '%s' already exists."), ref->buf + strlen("refs/heads/"));
 191
 192        if (!attr_only) {
 193                const char *head;
 194                unsigned char sha1[20];
 195
 196                head = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
 197                if (!is_bare_repository() && head && !strcmp(head, ref->buf))
 198                        die(_("Cannot force update the current branch."));
 199        }
 200        return 1;
 201}
 202
 203static int check_tracking_branch(struct remote *remote, void *cb_data)
 204{
 205        char *tracking_branch = cb_data;
 206        struct refspec query;
 207        memset(&query, 0, sizeof(struct refspec));
 208        query.dst = tracking_branch;
 209        return !remote_find_tracking(remote, &query);
 210}
 211
 212static int validate_remote_tracking_branch(char *ref)
 213{
 214        return !for_each_remote(check_tracking_branch, ref);
 215}
 216
 217static const char upstream_not_branch[] =
 218N_("Cannot setup tracking information; starting point '%s' is not a branch.");
 219static const char upstream_missing[] =
 220N_("the requested upstream branch '%s' does not exist");
 221static const char upstream_advice[] =
 222N_("\n"
 223"If you are planning on basing your work on an upstream\n"
 224"branch that already exists at the remote, you may need to\n"
 225"run \"git fetch\" to retrieve it.\n"
 226"\n"
 227"If you are planning to push out a new local branch that\n"
 228"will track its remote counterpart, you may want to use\n"
 229"\"git push -u\" to set the upstream config as you push.");
 230
 231void create_branch(const char *name, const char *start_name,
 232                   int force, int reflog, int clobber_head,
 233                   int quiet, enum branch_track track)
 234{
 235        struct commit *commit;
 236        unsigned char sha1[20];
 237        char *real_ref, msg[PATH_MAX + 20];
 238        struct strbuf ref = STRBUF_INIT;
 239        int forcing = 0;
 240        int dont_change_ref = 0;
 241        int explicit_tracking = 0;
 242
 243        if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE)
 244                explicit_tracking = 1;
 245
 246        if (validate_new_branchname(name, &ref, force,
 247                                    track == BRANCH_TRACK_OVERRIDE ||
 248                                    clobber_head)) {
 249                if (!force)
 250                        dont_change_ref = 1;
 251                else
 252                        forcing = 1;
 253        }
 254
 255        real_ref = NULL;
 256        if (get_sha1(start_name, sha1)) {
 257                if (explicit_tracking) {
 258                        if (advice_set_upstream_failure) {
 259                                error(_(upstream_missing), start_name);
 260                                advise(_(upstream_advice));
 261                                exit(1);
 262                        }
 263                        die(_(upstream_missing), start_name);
 264                }
 265                die(_("Not a valid object name: '%s'."), start_name);
 266        }
 267
 268        switch (dwim_ref(start_name, strlen(start_name), sha1, &real_ref)) {
 269        case 0:
 270                /* Not branching from any existing branch */
 271                if (explicit_tracking)
 272                        die(_(upstream_not_branch), start_name);
 273                break;
 274        case 1:
 275                /* Unique completion -- good, only if it is a real branch */
 276                if (!starts_with(real_ref, "refs/heads/") &&
 277                    validate_remote_tracking_branch(real_ref)) {
 278                        if (explicit_tracking)
 279                                die(_(upstream_not_branch), start_name);
 280                        else
 281                                real_ref = NULL;
 282                }
 283                break;
 284        default:
 285                die(_("Ambiguous object name: '%s'."), start_name);
 286                break;
 287        }
 288
 289        if ((commit = lookup_commit_reference(sha1)) == NULL)
 290                die(_("Not a valid branch point: '%s'."), start_name);
 291        hashcpy(sha1, commit->object.oid.hash);
 292
 293        if (forcing)
 294                snprintf(msg, sizeof msg, "branch: Reset to %s",
 295                         start_name);
 296        else if (!dont_change_ref)
 297                snprintf(msg, sizeof msg, "branch: Created from %s",
 298                         start_name);
 299
 300        if (reflog)
 301                log_all_ref_updates = 1;
 302
 303        if (!dont_change_ref) {
 304                struct ref_transaction *transaction;
 305                struct strbuf err = STRBUF_INIT;
 306
 307                transaction = ref_transaction_begin(&err);
 308                if (!transaction ||
 309                    ref_transaction_update(transaction, ref.buf,
 310                                           sha1, forcing ? NULL : null_sha1,
 311                                           0, msg, &err) ||
 312                    ref_transaction_commit(transaction, &err))
 313                        die("%s", err.buf);
 314                ref_transaction_free(transaction);
 315                strbuf_release(&err);
 316        }
 317
 318        if (real_ref && track)
 319                setup_tracking(ref.buf + 11, real_ref, track, quiet);
 320
 321        strbuf_release(&ref);
 322        free(real_ref);
 323}
 324
 325void remove_branch_state(void)
 326{
 327        unlink(git_path_cherry_pick_head());
 328        unlink(git_path_revert_head());
 329        unlink(git_path_merge_head());
 330        unlink(git_path_merge_rr());
 331        unlink(git_path_merge_msg());
 332        unlink(git_path_merge_mode());
 333        unlink(git_path_squash_msg());
 334}
 335
 336void die_if_checked_out(const char *branch, int ignore_current_worktree)
 337{
 338        const struct worktree *wt;
 339
 340        wt = find_shared_symref("HEAD", branch);
 341        if (!wt || (ignore_current_worktree && wt->is_current))
 342                return;
 343        skip_prefix(branch, "refs/heads/", &branch);
 344        die(_("'%s' is already checked out at '%s'"),
 345            branch, wt->path);
 346}
 347
 348int replace_each_worktree_head_symref(const char *oldref, const char *newref)
 349{
 350        int ret = 0;
 351        struct worktree **worktrees = get_worktrees();
 352        int i;
 353
 354        for (i = 0; worktrees[i]; i++) {
 355                if (worktrees[i]->is_detached)
 356                        continue;
 357                if (strcmp(oldref, worktrees[i]->head_ref))
 358                        continue;
 359
 360                if (set_worktree_head_symref(get_worktree_git_dir(worktrees[i]),
 361                                             newref)) {
 362                        ret = -1;
 363                        error(_("HEAD of working tree %s is not updated"),
 364                              worktrees[i]->path);
 365                }
 366        }
 367
 368        free_worktrees(worktrees);
 369        return ret;
 370}