#include "builtin.h" #include "lockfile.h" #include "parse-options.h" #include "refs.h" #include "commit.h" #include "tree.h" #include "tree-walk.h" #include "cache-tree.h" #include "unpack-trees.h" #include "dir.h" #include "run-command.h" #include "merge-recursive.h" #include "branch.h" #include "diff.h" #include "revision.h" #include "remote.h" #include "blob.h" #include "xdiff-interface.h" #include "ll-merge.h" #include "resolve-undo.h" #include "submodule.h" #include "argv-array.h" static const char * const checkout_usage[] = { N_("git checkout [options] <branch>"), N_("git checkout [options] [<branch>] -- <file>..."), NULL, }; struct checkout_opts { int patch_mode; int quiet; int merge; int force; int force_detach; int writeout_stage; int overwrite_ignore; int ignore_skipworktree; const char *new_branch; const char *new_branch_force; const char *new_orphan_branch; int new_branch_log; enum branch_track track; struct diff_options diff_options; int branch_exists; const char *prefix; struct pathspec pathspec; struct tree *source_tree; }; static int post_checkout_hook(struct commit *old, struct commit *new, int changed) { return run_hook_le(NULL, "post-checkout", sha1_to_hex(old ? old->object.sha1 : null_sha1), sha1_to_hex(new ? new->object.sha1 : null_sha1), changed ? "1" : "0", NULL); /* "new" can be NULL when checking out from the index before a commit exists. */ } static int update_some(const unsigned char *sha1, struct strbuf *base, const char *pathname, unsigned mode, int stage, void *context) { int len; struct cache_entry *ce; int pos; if (S_ISDIR(mode)) return READ_TREE_RECURSIVE; len = base->len + strlen(pathname); ce = xcalloc(1, cache_entry_size(len)); hashcpy(ce->sha1, sha1); memcpy(ce->name, base->buf, base->len); memcpy(ce->name + base->len, pathname, len - base->len); ce->ce_flags = create_ce_flags(0) | CE_UPDATE; ce->ce_namelen = len; ce->ce_mode = create_ce_mode(mode); /* * If the entry is the same as the current index, we can leave the old * entry in place. Whether it is UPTODATE or not, checkout_entry will * do the right thing. */ pos = cache_name_pos(ce->name, ce->ce_namelen); if (pos >= 0) { struct cache_entry *old = active_cache[pos]; if (ce->ce_mode == old->ce_mode && !hashcmp(ce->sha1, old->sha1)) { old->ce_flags |= CE_UPDATE; free(ce); return 0; } } add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE); return 0; } static int read_tree_some(struct tree *tree, const struct pathspec *pathspec) { read_tree_recursive(tree, "", 0, 0, pathspec, update_some, NULL); /* update the index with the given tree's info * for all args, expanding wildcards, and exit * with any non-zero return code. */ return 0; } static int skip_same_name(const struct cache_entry *ce, int pos) { while (++pos < active_nr && !strcmp(active_cache[pos]->name, ce->name)) ; /* skip */ return pos; } static int check_stage(int stage, const struct cache_entry *ce, int pos) { while (pos < active_nr && !strcmp(active_cache[pos]->name, ce->name)) { if (ce_stage(active_cache[pos]) == stage) return 0; pos++; } if (stage == 2) return error(_("path '%s' does not have our version"), ce->name); else return error(_("path '%s' does not have their version"), ce->name); } static int check_stages(unsigned stages, const struct cache_entry *ce, int pos) { unsigned seen = 0; const char *name = ce->name; while (pos < active_nr) { ce = active_cache[pos]; if (strcmp(name, ce->name)) break; seen |= (1 << ce_stage(ce)); pos++; } if ((stages & seen) != stages) return error(_("path '%s' does not have all necessary versions"), name); return 0; } static int checkout_stage(int stage, struct cache_entry *ce, int pos, struct checkout *state) { while (pos < active_nr && !strcmp(active_cache[pos]->name, ce->name)) { if (ce_stage(active_cache[pos]) == stage) return checkout_entry(active_cache[pos], state, NULL); pos++; } if (stage == 2) return error(_("path '%s' does not have our version"), ce->name); else return error(_("path '%s' does not have their version"), ce->name); } static int checkout_merged(int pos, struct checkout *state) { struct cache_entry *ce = active_cache[pos]; const char *path = ce->name; mmfile_t ancestor, ours, theirs; int status; unsigned char sha1[20]; mmbuffer_t result_buf; unsigned char threeway[3][20]; unsigned mode = 0; memset(threeway, 0, sizeof(threeway)); while (pos < active_nr) { int stage; stage = ce_stage(ce); if (!stage || strcmp(path, ce->name)) break; hashcpy(threeway[stage - 1], ce->sha1); if (stage == 2) mode = create_ce_mode(ce->ce_mode); pos++; ce = active_cache[pos]; } if (is_null_sha1(threeway[1]) || is_null_sha1(threeway[2])) return error(_("path '%s' does not have necessary versions"), path); read_mmblob(&ancestor, threeway[0]); read_mmblob(&ours, threeway[1]); read_mmblob(&theirs, threeway[2]); /* * NEEDSWORK: re-create conflicts from merges with * merge.renormalize set, too */ status = ll_merge(&result_buf, path, &ancestor, "base", &ours, "ours", &theirs, "theirs", NULL); free(ancestor.ptr); free(ours.ptr); free(theirs.ptr); if (status < 0 || !result_buf.ptr) { free(result_buf.ptr); return error(_("path '%s': cannot merge"), path); } /* * NEEDSWORK: * There is absolutely no reason to write this as a blob object * and create a phony cache entry just to leak. This hack is * primarily to get to the write_entry() machinery that massages * the contents to work-tree format and writes out which only * allows it for a cache entry. The code in write_entry() needs * to be refactored to allow us to feed a <buffer, size, mode> * instead of a cache entry. Such a refactoring would help * merge_recursive as well (it also writes the merge result to the * object database even when it may contain conflicts). */ if (write_sha1_file(result_buf.ptr, result_buf.size, blob_type, sha1)) die(_("Unable to add merge result for '%s'"), path); ce = make_cache_entry(mode, sha1, path, 2, 0); if (!ce) die(_("make_cache_entry failed for path '%s'"), path); status = checkout_entry(ce, state, NULL); return status; } static int checkout_paths(const struct checkout_opts *opts, const char *revision) { int pos; struct checkout state; static char *ps_matched; unsigned char rev[20]; int flag; struct commit *head; int errs = 0; struct lock_file *lock_file; if (opts->track != BRANCH_TRACK_UNSPECIFIED) die(_("'%s' cannot be used with updating paths"), "--track"); if (opts->new_branch_log) die(_("'%s' cannot be used with updating paths"), "-l"); if (opts->force && opts->patch_mode) die(_("'%s' cannot be used with updating paths"), "-f"); if (opts->force_detach) die(_("'%s' cannot be used with updating paths"), "--detach"); if (opts->merge && opts->patch_mode) die(_("'%s' cannot be used with %s"), "--merge", "--patch"); if (opts->force && opts->merge) die(_("'%s' cannot be used with %s"), "-f", "-m"); if (opts->new_branch) die(_("Cannot update paths and switch to branch '%s' at the same time."), opts->new_branch); if (opts->patch_mode) return run_add_interactive(revision, "--patch=checkout", &opts->pathspec); lock_file = xcalloc(1, sizeof(struct lock_file)); hold_locked_index(lock_file, 1); if (read_cache_preload(&opts->pathspec) < 0) return error(_("corrupt index file")); if (opts->source_tree) read_tree_some(opts->source_tree, &opts->pathspec); ps_matched = xcalloc(1, opts->pathspec.nr); /* * Make sure all pathspecs participated in locating the paths * to be checked out. */ for (pos = 0; pos < active_nr; pos++) { struct cache_entry *ce = active_cache[pos]; ce->ce_flags &= ~CE_MATCHED; if (!opts->ignore_skipworktree && ce_skip_worktree(ce)) continue; if (opts->source_tree && !(ce->ce_flags & CE_UPDATE)) /* * "git checkout tree-ish -- path", but this entry * is in the original index; it will not be checked * out to the working tree and it does not matter * if pathspec matched this entry. We will not do * anything to this entry at all. */ continue; /* * Either this entry came from the tree-ish we are * checking the paths out of, or we are checking out * of the index. * * If it comes from the tree-ish, we already know it * matches the pathspec and could just stamp * CE_MATCHED to it from update_some(). But we still * need ps_matched and read_tree_recursive (and * eventually tree_entry_interesting) cannot fill * ps_matched yet. Once it can, we can avoid calling * match_pathspec() for _all_ entries when * opts->source_tree != NULL. */ if (ce_path_match(ce, &opts->pathspec, ps_matched)) ce->ce_flags |= CE_MATCHED; } if (report_path_error(ps_matched, &opts->pathspec, opts->prefix)) { free(ps_matched); return 1; } free(ps_matched); /* "checkout -m path" to recreate conflicted state */ if (opts->merge) unmerge_marked_index(&the_index); /* Any unmerged paths? */ for (pos = 0; pos < active_nr; pos++) { const struct cache_entry *ce = active_cache[pos]; if (ce->ce_flags & CE_MATCHED) { if (!ce_stage(ce)) continue; if (opts->force) { warning(_("path '%s' is unmerged"), ce->name); } else if (opts->writeout_stage) { errs |= check_stage(opts->writeout_stage, ce, pos); } else if (opts->merge) { errs |= check_stages((1<<2) | (1<<3), ce, pos); } else { errs = 1; error(_("path '%s' is unmerged"), ce->name); } pos = skip_same_name(ce, pos) - 1; } } if (errs) return 1; /* Now we are committed to check them out */ memset(&state, 0, sizeof(state)); state.force = 1; state.refresh_cache = 1; state.istate = &the_index; for (pos = 0; pos < active_nr; pos++) { struct cache_entry *ce = active_cache[pos]; if (ce->ce_flags & CE_MATCHED) { if (!ce_stage(ce)) { errs |= checkout_entry(ce, &state, NULL); continue; } if (opts->writeout_stage) errs |= checkout_stage(opts->writeout_stage, ce, pos, &state); else if (opts->merge) errs |= checkout_merged(pos, &state); pos = skip_same_name(ce, pos) - 1; } } if (write_locked_index(&the_index, lock_file, COMMIT_LOCK)) die(_("unable to write new index file")); read_ref_full("HEAD", 0, rev, &flag); head = lookup_commit_reference_gently(rev, 1); errs |= post_checkout_hook(head, head, 0); return errs; } static void show_local_changes(struct object *head, const struct diff_options *opts) { struct rev_info rev; /* I think we want full paths, even if we're in a subdirectory. */ init_revisions(&rev, NULL); rev.diffopt.flags = opts->flags; rev.diffopt.output_format |= DIFF_FORMAT_NAME_STATUS; diff_setup_done(&rev.diffopt); add_pending_object(&rev, head, NULL); run_diff_index(&rev, 0); } static void describe_detached_head(const char *msg, struct commit *commit) { struct strbuf sb = STRBUF_INIT; if (!parse_commit(commit)) pp_commit_easy(CMIT_FMT_ONELINE, commit, &sb); fprintf(stderr, "%s %s... %s\n", msg, find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV), sb.buf); strbuf_release(&sb); } static int reset_tree(struct tree *tree, const struct checkout_opts *o, int worktree, int *writeout_error) { struct unpack_trees_options opts; struct tree_desc tree_desc; memset(&opts, 0, sizeof(opts)); opts.head_idx = -1; opts.update = worktree; opts.skip_unmerged = !worktree; opts.reset = 1; opts.merge = 1; opts.fn = oneway_merge; opts.verbose_update = !o->quiet && isatty(2); opts.src_index = &the_index; opts.dst_index = &the_index; parse_tree(tree); init_tree_desc(&tree_desc, tree->buffer, tree->size); switch (unpack_trees(1, &tree_desc, &opts)) { case -2: *writeout_error = 1; /* * We return 0 nevertheless, as the index is all right * and more importantly we have made best efforts to * update paths in the work tree, and we cannot revert * them. */ case 0: return 0; default: return 128; } } struct branch_info { const char *name; /* The short name used */ const char *path; /* The full name of a real branch */ struct commit *commit; /* The named commit */ }; static void setup_branch_path(struct branch_info *branch) { struct strbuf buf = STRBUF_INIT; strbuf_branchname(&buf, branch->name); if (strcmp(buf.buf, branch->name)) branch->name = xstrdup(buf.buf); strbuf_splice(&buf, 0, 0, "refs/heads/", 11); branch->path = strbuf_detach(&buf, NULL); } static int merge_working_tree(const struct checkout_opts *opts, struct branch_info *old, struct branch_info *new, int *writeout_error) { int ret; struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); hold_locked_index(lock_file, 1); if (read_cache_preload(NULL) < 0) return error(_("corrupt index file")); resolve_undo_clear(); if (opts->force) { ret = reset_tree(new->commit->tree, opts, 1, writeout_error); if (ret) return ret; } else { struct tree_desc trees[2]; struct tree *tree; struct unpack_trees_options topts; memset(&topts, 0, sizeof(topts)); topts.head_idx = -1; topts.src_index = &the_index; topts.dst_index = &the_index; setup_unpack_trees_porcelain(&topts, "checkout"); refresh_cache(REFRESH_QUIET); if (unmerged_cache()) { error(_("you need to resolve your current index first")); return 1; } /* 2-way merge to the new branch */ topts.initial_checkout = is_cache_unborn(); topts.update = 1; topts.merge = 1; topts.gently = opts->merge && old->commit; topts.verbose_update = !opts->quiet && isatty(2); topts.fn = twoway_merge; if (opts->overwrite_ignore) { topts.dir = xcalloc(1, sizeof(*topts.dir)); topts.dir->flags |= DIR_SHOW_IGNORED; setup_standard_excludes(topts.dir); } tree = parse_tree_indirect(old->commit ? old->commit->object.sha1 : EMPTY_TREE_SHA1_BIN); init_tree_desc(&trees[0], tree->buffer, tree->size); tree = parse_tree_indirect(new->commit->object.sha1); init_tree_desc(&trees[1], tree->buffer, tree->size); ret = unpack_trees(2, trees, &topts); if (ret == -1) { /* * Unpack couldn't do a trivial merge; either * give up or do a real merge, depending on * whether the merge flag was used. */ struct tree *result; struct tree *work; struct merge_options o; if (!opts->merge) return 1; /* * Without old->commit, the below is the same as * the two-tree unpack we already tried and failed. */ if (!old->commit) return 1; /* Do more real merge */ /* * We update the index fully, then write the * tree from the index, then merge the new * branch with the current tree, with the old * branch as the base. Then we reset the index * (but not the working tree) to the new * branch, leaving the working tree as the * merged version, but skipping unmerged * entries in the index. */ add_files_to_cache(NULL, NULL, 0); /* * NEEDSWORK: carrying over local changes * when branches have different end-of-line * normalization (or clean+smudge rules) is * a pain; plumb in an option to set * o.renormalize? */ init_merge_options(&o); o.verbosity = 0; work = write_tree_from_memory(&o); ret = reset_tree(new->commit->tree, opts, 1, writeout_error); if (ret) return ret; o.ancestor = old->name; o.branch1 = new->name; o.branch2 = "local"; merge_trees(&o, new->commit->tree, work, old->commit->tree, &result); ret = reset_tree(new->commit->tree, opts, 0, writeout_error); if (ret) return ret; } } if (!active_cache_tree) active_cache_tree = cache_tree(); if (!cache_tree_fully_valid(active_cache_tree)) cache_tree_update(&the_index, WRITE_TREE_SILENT | WRITE_TREE_REPAIR); if (write_locked_index(&the_index, lock_file, COMMIT_LOCK)) die(_("unable to write new index file")); if (!opts->force && !opts->quiet) show_local_changes(&new->commit->object, &opts->diff_options); return 0; } static void report_tracking(struct branch_info *new) { struct strbuf sb = STRBUF_INIT; struct branch *branch = branch_get(new->name); if (!format_tracking_info(branch, &sb)) return; fputs(sb.buf, stdout); strbuf_release(&sb); } static void update_refs_for_switch(const struct checkout_opts *opts, struct branch_info *old, struct branch_info *new) { struct strbuf msg = STRBUF_INIT; const char *old_desc, *reflog_msg; if (opts->new_branch) { if (opts->new_orphan_branch) { if (opts->new_branch_log && !log_all_ref_updates) { int temp; char log_file[PATH_MAX]; char *ref_name = mkpath("refs/heads/%s", opts->new_orphan_branch); temp = log_all_ref_updates; log_all_ref_updates = 1; if (log_ref_setup(ref_name, log_file, sizeof(log_file))) { fprintf(stderr, _("Can not do reflog for '%s'\n"), opts->new_orphan_branch); log_all_ref_updates = temp; return; } log_all_ref_updates = temp; } } else create_branch(old->name, opts->new_branch, new->name, opts->new_branch_force ? 1 : 0, opts->new_branch_log, opts->new_branch_force ? 1 : 0, opts->quiet, opts->track); new->name = opts->new_branch; setup_branch_path(new); } old_desc = old->name; if (!old_desc && old->commit) old_desc = sha1_to_hex(old->commit->object.sha1); reflog_msg = getenv("GIT_REFLOG_ACTION"); if (!reflog_msg) strbuf_addf(&msg, "checkout: moving from %s to %s", old_desc ? old_desc : "(invalid)", new->name); else strbuf_insert(&msg, 0, reflog_msg, strlen(reflog_msg)); if (!strcmp(new->name, "HEAD") && !new->path && !opts->force_detach) { /* Nothing to do. */ } else if (opts->force_detach || !new->path) { /* No longer on any branch. */ update_ref(msg.buf, "HEAD", new->commit->object.sha1, NULL, REF_NODEREF, UPDATE_REFS_DIE_ON_ERR); if (!opts->quiet) { if (old->path && advice_detached_head) detach_advice(new->name); describe_detached_head(_("HEAD is now at"), new->commit); } } else if (new->path) { /* Switch branches. */ create_symref("HEAD", new->path, msg.buf); if (!opts->quiet) { if (old->path && !strcmp(new->path, old->path)) { if (opts->new_branch_force) fprintf(stderr, _("Reset branch '%s'\n"), new->name); else fprintf(stderr, _("Already on '%s'\n"), new->name); } else if (opts->new_branch) { if (opts->branch_exists) fprintf(stderr, _("Switched to and reset branch '%s'\n"), new->name); else fprintf(stderr, _("Switched to a new branch '%s'\n"), new->name); } else { fprintf(stderr, _("Switched to branch '%s'\n"), new->name); } } if (old->path && old->name) { if (!ref_exists(old->path) && reflog_exists(old->path)) delete_reflog(old->path); } } remove_branch_state(); strbuf_release(&msg); if (!opts->quiet && (new->path || (!opts->force_detach && !strcmp(new->name, "HEAD")))) report_tracking(new); } static int add_pending_uninteresting_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data) { add_pending_sha1(cb_data, refname, sha1, UNINTERESTING); return 0; } static void describe_one_orphan(struct strbuf *sb, struct commit *commit) { strbuf_addstr(sb, " "); strbuf_addstr(sb, find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV)); strbuf_addch(sb, ' '); if (!parse_commit(commit)) pp_commit_easy(CMIT_FMT_ONELINE, commit, sb); strbuf_addch(sb, '\n'); } #define ORPHAN_CUTOFF 4 static void suggest_reattach(struct commit *commit, struct rev_info *revs) { struct commit *c, *last = NULL; struct strbuf sb = STRBUF_INIT; int lost = 0; while ((c = get_revision(revs)) != NULL) { if (lost < ORPHAN_CUTOFF) describe_one_orphan(&sb, c); last = c; lost++; } if (ORPHAN_CUTOFF < lost) { int more = lost - ORPHAN_CUTOFF; if (more == 1) describe_one_orphan(&sb, last); else strbuf_addf(&sb, _(" ... and %d more.\n"), more); } fprintf(stderr, Q_( /* The singular version */ "Warning: you are leaving %d commit behind, " "not connected to\n" "any of your branches:\n\n" "%s\n", /* The plural version */ "Warning: you are leaving %d commits behind, " "not connected to\n" "any of your branches:\n\n" "%s\n", /* Give ngettext() the count */ lost), lost, sb.buf); strbuf_release(&sb); if (advice_detached_head) fprintf(stderr, _( "If you want to keep them by creating a new branch, " "this may be a good time\nto do so with:\n\n" " git branch new_branch_name %s\n\n"), find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV)); } /* * We are about to leave commit that was at the tip of a detached * HEAD. If it is not reachable from any ref, this is the last chance * for the user to do so without resorting to reflog. */ static void orphaned_commit_warning(struct commit *old, struct commit *new) { struct rev_info revs; struct object *object = &old->object; struct object_array refs; init_revisions(&revs, NULL); setup_revisions(0, NULL, &revs, NULL); object->flags &= ~UNINTERESTING; add_pending_object(&revs, object, sha1_to_hex(object->sha1)); for_each_ref(add_pending_uninteresting_ref, &revs); add_pending_sha1(&revs, "HEAD", new->object.sha1, UNINTERESTING); refs = revs.pending; revs.leak_pending = 1; if (prepare_revision_walk(&revs)) die(_("internal error in revision walk")); if (!(old->object.flags & UNINTERESTING)) suggest_reattach(old, &revs); else describe_detached_head(_("Previous HEAD position was"), old); clear_commit_marks_for_object_array(&refs, ALL_REV_FLAGS); free(refs.objects); } static int switch_branches(const struct checkout_opts *opts, struct branch_info *new) { int ret = 0; struct branch_info old; void *path_to_free; unsigned char rev[20]; int flag, writeout_error = 0; memset(&old, 0, sizeof(old)); old.path = path_to_free = resolve_refdup("HEAD", 0, rev, &flag); old.commit = lookup_commit_reference_gently(rev, 1); if (!(flag & REF_ISSYMREF)) old.path = NULL; if (old.path) skip_prefix(old.path, "refs/heads/", &old.name); if (!new->name) { new->name = "HEAD"; new->commit = old.commit; if (!new->commit) die(_("You are on a branch yet to be born")); parse_commit_or_die(new->commit); } ret = merge_working_tree(opts, &old, new, &writeout_error); if (ret) { free(path_to_free); return ret; } if (!opts->quiet && !old.path && old.commit && new->commit != old.commit) orphaned_commit_warning(old.commit, new->commit); update_refs_for_switch(opts, &old, new); ret = post_checkout_hook(old.commit, new->commit, 1); free(path_to_free); return ret || writeout_error; } static int git_checkout_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "diff.ignoresubmodules")) { struct checkout_opts *opts = cb; handle_ignore_submodules_arg(&opts->diff_options, value); return 0; } if (starts_with(var, "submodule.")) return parse_submodule_config_option(var, value); return git_xmerge_config(var, value, NULL); } struct tracking_name_data { /* const */ char *src_ref; char *dst_ref; unsigned char *dst_sha1; int unique; }; static int check_tracking_name(struct remote *remote, void *cb_data) { struct tracking_name_data *cb = cb_data; struct refspec query; memset(&query, 0, sizeof(struct refspec)); query.src = cb->src_ref; if (remote_find_tracking(remote, &query) || get_sha1(query.dst, cb->dst_sha1)) { free(query.dst); return 0; } if (cb->dst_ref) { free(query.dst); cb->unique = 0; return 0; } cb->dst_ref = query.dst; return 0; } static const char *unique_tracking_name(const char *name, unsigned char *sha1) { struct tracking_name_data cb_data = { NULL, NULL, NULL, 1 }; char src_ref[PATH_MAX]; snprintf(src_ref, PATH_MAX, "refs/heads/%s", name); cb_data.src_ref = src_ref; cb_data.dst_sha1 = sha1; for_each_remote(check_tracking_name, &cb_data); if (cb_data.unique) return cb_data.dst_ref; free(cb_data.dst_ref); return NULL; } static int parse_branchname_arg(int argc, const char **argv, int dwim_new_local_branch_ok, struct branch_info *new, struct tree **source_tree, unsigned char rev[20], const char **new_branch) { int argcount = 0; unsigned char branch_rev[20]; const char *arg; int dash_dash_pos; int has_dash_dash = 0; int i; /* * case 1: git checkout <ref> -- [<paths>] * * <ref> must be a valid tree, everything after the '--' must be * a path. * * case 2: git checkout -- [<paths>] * * everything after the '--' must be paths. * * case 3: git checkout <something> [--] * * (a) If <something> is a commit, that is to * switch to the branch or detach HEAD at it. As a special case, * if <something> is A...B (missing A or B means HEAD but you can * omit at most one side), and if there is a unique merge base * between A and B, A...B names that merge base. * * (b) If <something> is _not_ a commit, either "--" is present * or <something> is not a path, no -t or -b was given, and * and there is a tracking branch whose name is <something> * in one and only one remote, then this is a short-hand to * fork local <something> from that remote-tracking branch. * * (c) Otherwise, if "--" is present, treat it like case (1). * * (d) Otherwise : * - if it's a reference, treat it like case (1) * - else if it's a path, treat it like case (2) * - else: fail. * * case 4: git checkout <something> <paths> * * The first argument must not be ambiguous. * - If it's *only* a reference, treat it like case (1). * - If it's only a path, treat it like case (2). * - else: fail. * */ if (!argc) return 0; arg = argv[0]; dash_dash_pos = -1; for (i = 0; i < argc; i++) { if (!strcmp(argv[i], "--")) { dash_dash_pos = i; break; } } if (dash_dash_pos == 0) return 1; /* case (2) */ else if (dash_dash_pos == 1) has_dash_dash = 1; /* case (3) or (1) */ else if (dash_dash_pos >= 2) die(_("only one reference expected, %d given."), dash_dash_pos); if (!strcmp(arg, "-")) arg = "@{-1}"; if (get_sha1_mb(arg, rev)) { /* * Either case (3) or (4), with <something> not being * a commit, or an attempt to use case (1) with an * invalid ref. * * It's likely an error, but we need to find out if * we should auto-create the branch, case (3).(b). */ int recover_with_dwim = dwim_new_local_branch_ok; if (check_filename(NULL, arg) && !has_dash_dash) recover_with_dwim = 0; /* * Accept "git checkout foo" and "git checkout foo --" * as candidates for dwim. */ if (!(argc == 1 && !has_dash_dash) && !(argc == 2 && has_dash_dash)) recover_with_dwim = 0; if (recover_with_dwim) { const char *remote = unique_tracking_name(arg, rev); if (remote) { *new_branch = arg; arg = remote; /* DWIMmed to create local branch, case (3).(b) */ } else { recover_with_dwim = 0; } } if (!recover_with_dwim) { if (has_dash_dash) die(_("invalid reference: %s"), arg); return argcount; } } /* we can't end up being in (2) anymore, eat the argument */ argcount++; argv++; argc--; new->name = arg; setup_branch_path(new); if (!check_refname_format(new->path, 0) && !read_ref(new->path, branch_rev)) hashcpy(rev, branch_rev); else new->path = NULL; /* not an existing branch */ new->commit = lookup_commit_reference_gently(rev, 1); if (!new->commit) { /* not a commit */ *source_tree = parse_tree_indirect(rev); } else { parse_commit_or_die(new->commit); *source_tree = new->commit->tree; } if (!*source_tree) /* case (1): want a tree */ die(_("reference is not a tree: %s"), arg); if (!has_dash_dash) {/* case (3).(d) -> (1) */ /* * Do not complain the most common case * git checkout branch * even if there happen to be a file called 'branch'; * it would be extremely annoying. */ if (argc) verify_non_filename(NULL, arg); } else { argcount++; argv++; argc--; } return argcount; } static int switch_unborn_to_new_branch(const struct checkout_opts *opts) { int status; struct strbuf branch_ref = STRBUF_INIT; if (!opts->new_branch) die(_("You are on a branch yet to be born")); strbuf_addf(&branch_ref, "refs/heads/%s", opts->new_branch); status = create_symref("HEAD", branch_ref.buf, "checkout -b"); strbuf_release(&branch_ref); if (!opts->quiet) fprintf(stderr, _("Switched to a new branch '%s'\n"), opts->new_branch); return status; } static int checkout_branch(struct checkout_opts *opts, struct branch_info *new) { if (opts->pathspec.nr) die(_("paths cannot be used with switching branches")); if (opts->patch_mode) die(_("'%s' cannot be used with switching branches"), "--patch"); if (opts->writeout_stage) die(_("'%s' cannot be used with switching branches"), "--ours/--theirs"); if (opts->force && opts->merge) die(_("'%s' cannot be used with '%s'"), "-f", "-m"); if (opts->force_detach && opts->new_branch) die(_("'%s' cannot be used with '%s'"), "--detach", "-b/-B/--orphan"); if (opts->new_orphan_branch) { if (opts->track != BRANCH_TRACK_UNSPECIFIED) die(_("'%s' cannot be used with '%s'"), "--orphan", "-t"); } else if (opts->force_detach) { if (opts->track != BRANCH_TRACK_UNSPECIFIED) die(_("'%s' cannot be used with '%s'"), "--detach", "-t"); } else if (opts->track == BRANCH_TRACK_UNSPECIFIED) opts->track = git_branch_track; if (new->name && !new->commit) die(_("Cannot switch branch to a non-commit '%s'"), new->name); if (!new->commit && opts->new_branch) { unsigned char rev[20]; int flag; if (!read_ref_full("HEAD", 0, rev, &flag) && (flag & REF_ISSYMREF) && is_null_sha1(rev)) return switch_unborn_to_new_branch(opts); } return switch_branches(opts, new); } int cmd_checkout(int argc, const char **argv, const char *prefix) { struct checkout_opts opts; struct branch_info new; char *conflict_style = NULL; int dwim_new_local_branch = 1; struct option options[] = { OPT__QUIET(&opts.quiet, N_("suppress progress reporting")), OPT_STRING('b', NULL, &opts.new_branch, N_("branch"), N_("create and checkout a new branch")), OPT_STRING('B', NULL, &opts.new_branch_force, N_("branch"), N_("create/reset and checkout a branch")), OPT_BOOL('l', NULL, &opts.new_branch_log, N_("create reflog for new branch")), OPT_BOOL(0, "detach", &opts.force_detach, N_("detach the HEAD at named commit")), OPT_SET_INT('t', "track", &opts.track, N_("set upstream info for new branch"), BRANCH_TRACK_EXPLICIT), OPT_STRING(0, "orphan", &opts.new_orphan_branch, N_("new-branch"), N_("new unparented branch")), OPT_SET_INT('2', "ours", &opts.writeout_stage, N_("checkout our version for unmerged files"), 2), OPT_SET_INT('3', "theirs", &opts.writeout_stage, N_("checkout their version for unmerged files"), 3), OPT__FORCE(&opts.force, N_("force checkout (throw away local modifications)")), OPT_BOOL('m', "merge", &opts.merge, N_("perform a 3-way merge with the new branch")), OPT_BOOL(0, "overwrite-ignore", &opts.overwrite_ignore, N_("update ignored files (default)")), OPT_STRING(0, "conflict", &conflict_style, N_("style"), N_("conflict style (merge or diff3)")), OPT_BOOL('p', "patch", &opts.patch_mode, N_("select hunks interactively")), OPT_BOOL(0, "ignore-skip-worktree-bits", &opts.ignore_skipworktree, N_("do not limit pathspecs to sparse entries only")), OPT_HIDDEN_BOOL(0, "guess", &dwim_new_local_branch, N_("second guess 'git checkout no-such-branch'")), OPT_END(), }; memset(&opts, 0, sizeof(opts)); memset(&new, 0, sizeof(new)); opts.overwrite_ignore = 1; opts.prefix = prefix; gitmodules_config(); git_config(git_checkout_config, &opts); opts.track = BRANCH_TRACK_UNSPECIFIED; argc = parse_options(argc, argv, prefix, options, checkout_usage, PARSE_OPT_KEEP_DASHDASH); if (conflict_style) { opts.merge = 1; /* implied */ git_xmerge_config("merge.conflictstyle", conflict_style, NULL); } if ((!!opts.new_branch + !!opts.new_branch_force + !!opts.new_orphan_branch) > 1) die(_("-b, -B and --orphan are mutually exclusive")); /* * From here on, new_branch will contain the branch to be checked out, * and new_branch_force and new_orphan_branch will tell us which one of * -b/-B/--orphan is being used. */ if (opts.new_branch_force) opts.new_branch = opts.new_branch_force; if (opts.new_orphan_branch) opts.new_branch = opts.new_orphan_branch; /* --track without -b/-B/--orphan should DWIM */ if (opts.track != BRANCH_TRACK_UNSPECIFIED && !opts.new_branch) { const char *argv0 = argv[0]; if (!argc || !strcmp(argv0, "--")) die (_("--track needs a branch name")); skip_prefix(argv0, "refs/", &argv0); skip_prefix(argv0, "remotes/", &argv0); argv0 = strchr(argv0, '/'); if (!argv0 || !argv0[1]) die (_("Missing branch name; try -b")); opts.new_branch = argv0 + 1; } /* * Extract branch name from command line arguments, so * all that is left is pathspecs. * * Handle * * 1) git checkout <tree> -- [<paths>] * 2) git checkout -- [<paths>] * 3) git checkout <something> [<paths>] * * including "last branch" syntax and DWIM-ery for names of * remote branches, erroring out for invalid or ambiguous cases. */ if (argc) { unsigned char rev[20]; int dwim_ok = !opts.patch_mode && dwim_new_local_branch && opts.track == BRANCH_TRACK_UNSPECIFIED && !opts.new_branch; int n = parse_branchname_arg(argc, argv, dwim_ok, &new, &opts.source_tree, rev, &opts.new_branch); argv += n; argc -= n; } if (argc) { parse_pathspec(&opts.pathspec, 0, opts.patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0, prefix, argv); if (!opts.pathspec.nr) die(_("invalid path specification")); /* * Try to give more helpful suggestion. * new_branch && argc > 1 will be caught later. */ if (opts.new_branch && argc == 1) die(_("Cannot update paths and switch to branch '%s' at the same time.\n" "Did you intend to checkout '%s' which can not be resolved as commit?"), opts.new_branch, argv[0]); if (opts.force_detach) die(_("git checkout: --detach does not take a path argument '%s'"), argv[0]); if (1 < !!opts.writeout_stage + !!opts.force + !!opts.merge) die(_("git checkout: --ours/--theirs, --force and --merge are incompatible when\n" "checking out of the index.")); } if (opts.new_branch) { struct strbuf buf = STRBUF_INIT; opts.branch_exists = validate_new_branchname(opts.new_branch, &buf, !!opts.new_branch_force, !!opts.new_branch_force); strbuf_release(&buf); } if (opts.patch_mode || opts.pathspec.nr) return checkout_paths(&opts, new.name); else return checkout_branch(&opts, &new); }