From: Junio C Hamano Date: Tue, 28 Nov 2017 04:41:49 +0000 (+0900) Subject: Merge branch 'jc/branch-name-sanity' X-Git-Tag: v2.16.0-rc0~89 X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/16169285f1e63f6a3d9ec10e48f55d6825d3156b?hp=-c Merge branch 'jc/branch-name-sanity' "git branch" and "git checkout -b" are now forbidden from creating a branch whose name is "HEAD". * jc/branch-name-sanity: builtin/branch: remove redundant check for HEAD branch: correctly reject refs/heads/{-dash,HEAD} branch: split validate_new_branchname() into two branch: streamline "attr_only" handling in validate_new_branchname() --- 16169285f1e63f6a3d9ec10e48f55d6825d3156b diff --combined branch.c index 62f7b0d8c2,2c3a364a0b..fe1e1c3676 --- a/branch.c +++ b/branch.c @@@ -178,24 -178,40 +178,40 @@@ int read_branch_desc(struct strbuf *buf return 0; } - int validate_new_branchname(const char *name, struct strbuf *ref, - int force, int attr_only) + /* + * 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); - if (!ref_exists(ref->buf)) + 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; - else if (!force && !attr_only) - die(_("A branch named '%s' already exists."), ref->buf + strlen("refs/heads/")); - if (!attr_only) { - const char *head; + 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.")); - 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; } @@@ -242,9 -258,9 +258,9 @@@ void create_branch(const char *name, co if (track == BRANCH_TRACK_EXPLICIT || track == BRANCH_TRACK_OVERRIDE) explicit_tracking = 1; - if (validate_new_branchname(name, &ref, force, - track == BRANCH_TRACK_OVERRIDE || - clobber_head)) { + if ((track == BRANCH_TRACK_OVERRIDE || clobber_head) + ? validate_branchname(name, &ref) + : validate_new_branchname(name, &ref, force)) { if (!force) dont_change_ref = 1; else @@@ -264,7 -280,7 +280,7 @@@ die(_("Not a valid object name: '%s'."), start_name); } - switch (dwim_ref(start_name, strlen(start_name), oid.hash, &real_ref)) { + switch (dwim_ref(start_name, strlen(start_name), &oid, &real_ref)) { case 0: /* Not branching from any existing branch */ if (explicit_tracking) @@@ -305,7 -321,7 +321,7 @@@ transaction = ref_transaction_begin(&err); if (!transaction || ref_transaction_update(transaction, ref.buf, - oid.hash, forcing ? NULL : null_sha1, + &oid, forcing ? NULL : &null_oid, 0, msg, &err) || ref_transaction_commit(transaction, &err)) die("%s", err.buf); diff --combined builtin/branch.c index 33fd5fcfd1,945790b60b..5fc57cdc98 --- a/builtin/branch.c +++ b/builtin/branch.c @@@ -93,7 -93,7 +93,7 @@@ static int git_branch_config(const cha return config_error_nonbool(var); return color_parse(value, branch_colors[slot]); } - return git_default_config(var, value, cb); + return git_color_default_config(var, value, cb); } static const char *branch_get_color(enum color_branch ix) @@@ -125,7 -125,7 +125,7 @@@ static int branch_merged(int kind, cons if (upstream && (reference_name = reference_name_to_free = resolve_refdup(upstream, RESOLVE_REF_READING, - oid.hash, NULL)) != NULL) + &oid, NULL)) != NULL) reference_rev = lookup_commit_reference(&oid); } if (!reference_rev) @@@ -241,7 -241,7 +241,7 @@@ static int delete_branches(int argc, co RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE | RESOLVE_REF_ALLOW_BAD_NAME, - oid.hash, &flags); + &oid, &flags); if (!target) { error(remote_branch ? _("remote-tracking branch '%s' not found.") @@@ -257,8 -257,8 +257,8 @@@ goto next; } - if (delete_ref(NULL, name, is_null_oid(&oid) ? NULL : oid.hash, - REF_NODEREF)) { + if (delete_ref(NULL, name, is_null_oid(&oid) ? NULL : &oid, + REF_NO_DEREF)) { error(remote_branch ? _("Error deleting remote-tracking branch '%s'") : _("Error deleting branch '%s'"), @@@ -463,7 -463,6 +463,6 @@@ static void copy_or_rename_branch(cons struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT; struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT; int recovery = 0; - int clobber_head_ok; if (!oldname) { if (copy) @@@ -487,9 -486,10 +486,10 @@@ * A command like "git branch -M currentbranch currentbranch" cannot * cause the worktree to become inconsistent with HEAD, so allow it. */ - clobber_head_ok = !strcmp(oldname, newname); - - validate_new_branchname(newname, &newref, force, clobber_head_ok); + if (!strcmp(oldname, newname)) + validate_branchname(newname, &newref); + else + validate_new_branchname(newname, &newref, force); reject_rebase_or_bisect_branch(oldref.buf); @@@ -636,7 -636,7 +636,7 @@@ int cmd_branch(int argc, const char **a track = git_branch_track; - head = resolve_refdup("HEAD", 0, head_oid.hash, NULL); + head = resolve_refdup("HEAD", 0, &head_oid, NULL); if (!head) die(_("Failed to resolve HEAD as a valid ref.")); if (!strcmp(head, "HEAD")) @@@ -793,9 -793,6 +793,6 @@@ } else if (argc > 0 && argc <= 2) { struct branch *branch = branch_get(argv[0]); - if (!strcmp(argv[0], "HEAD")) - die(_("it does not make sense to create 'HEAD' manually")); - if (!branch) die(_("no such branch '%s'"), argv[0]); diff --combined builtin/checkout.c index 7d8bcc3833,697ac7dcaf..3faae382de --- a/builtin/checkout.c +++ b/builtin/checkout.c @@@ -247,7 -247,7 +247,7 @@@ static int checkout_paths(const struct struct object_id rev; struct commit *head; int errs = 0; - struct lock_file *lock_file; + struct lock_file lock_file = LOCK_INIT; if (opts->track != BRANCH_TRACK_UNSPECIFIED) die(_("'%s' cannot be used with updating paths"), "--track"); @@@ -275,7 -275,9 +275,7 @@@ return run_add_interactive(revision, "--patch=checkout", &opts->pathspec); - lock_file = xcalloc(1, sizeof(struct lock_file)); - - hold_locked_index(lock_file, LOCK_DIE_ON_ERROR); + hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR); if (read_cache_preload(&opts->pathspec) < 0) return error(_("index file corrupt")); @@@ -374,10 -376,10 +374,10 @@@ } errs |= finish_delayed_checkout(&state); - if (write_locked_index(&the_index, lock_file, COMMIT_LOCK)) + if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK)) die(_("unable to write new index file")); - read_ref_full("HEAD", 0, rev.hash, NULL); + read_ref_full("HEAD", 0, &rev, NULL); head = lookup_commit_reference_gently(&rev, 1); errs |= post_checkout_hook(head, head, 0); @@@ -470,9 -472,9 +470,9 @@@ static int merge_working_tree(const str int *writeout_error) { int ret; - struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file)); + struct lock_file lock_file = LOCK_INIT; - hold_locked_index(lock_file, LOCK_DIE_ON_ERROR); + hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR); if (read_cache_preload(NULL) < 0) return error(_("index file corrupt")); @@@ -589,7 -591,7 +589,7 @@@ 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)) + if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK)) die(_("unable to write new index file")); if (!opts->force && !opts->quiet) @@@ -662,8 -664,8 +662,8 @@@ static void update_refs_for_switch(cons 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.oid.hash, NULL, - REF_NODEREF, UPDATE_REFS_DIE_ON_ERR); + update_ref(msg.buf, "HEAD", &new->commit->object.oid, NULL, + REF_NO_DEREF, UPDATE_REFS_DIE_ON_ERR); if (!opts->quiet) { if (old->path && advice_detached_head && !opts->force_detach) @@@ -825,7 -827,7 +825,7 @@@ static int switch_branches(const struc struct object_id rev; int flag, writeout_error = 0; memset(&old, 0, sizeof(old)); - old.path = path_to_free = resolve_refdup("HEAD", 0, rev.hash, &flag); + old.path = path_to_free = resolve_refdup("HEAD", 0, &rev, &flag); if (old.path) old.commit = lookup_commit_reference_gently(&rev, 1); if (!(flag & REF_ISSYMREF)) @@@ -1036,7 -1038,7 +1036,7 @@@ static int parse_branchname_arg(int arg setup_branch_path(new); if (!check_refname_format(new->path, 0) && - !read_ref(new->path, branch_rev.hash)) + !read_ref(new->path, &branch_rev)) oidcpy(rev, &branch_rev); else new->path = NULL; /* not an existing branch */ @@@ -1134,7 -1136,7 +1134,7 @@@ static int checkout_branch(struct check struct object_id rev; int flag; - if (!read_ref_full("HEAD", 0, rev.hash, &flag) && + if (!read_ref_full("HEAD", 0, &rev, &flag) && (flag & REF_ISSYMREF) && is_null_oid(&rev)) return switch_unborn_to_new_branch(opts); } @@@ -1287,11 -1289,11 +1287,11 @@@ int cmd_checkout(int argc, const char * 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); - + if (opts.new_branch_force) + opts.branch_exists = validate_branchname(opts.new_branch, &buf); + else + opts.branch_exists = + validate_new_branchname(opts.new_branch, &buf, 0); strbuf_release(&buf); } diff --combined sha1_name.c index 9a2d5caf3b,67961d6e47..611c7d24dd --- a/sha1_name.c +++ b/sha1_name.c @@@ -153,9 -153,7 +153,9 @@@ static void unique_in_pack(struct packe uint32_t num, last, i, first = 0; const struct object_id *current = NULL; - open_pack_index(p); + if (open_pack_index(p) || !p->num_objects) + return; + num = p->num_objects; last = num; while (first < last) { @@@ -476,104 -474,10 +476,104 @@@ static unsigned msb(unsigned long val return r; } -int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len) +struct min_abbrev_data { + unsigned int init_len; + unsigned int cur_len; + char *hex; + const unsigned char *hash; +}; + +static inline char get_hex_char_from_oid(const struct object_id *oid, + unsigned int pos) +{ + static const char hex[] = "0123456789abcdef"; + + if ((pos & 1) == 0) + return hex[oid->hash[pos >> 1] >> 4]; + else + return hex[oid->hash[pos >> 1] & 0xf]; +} + +static int extend_abbrev_len(const struct object_id *oid, void *cb_data) +{ + struct min_abbrev_data *mad = cb_data; + + unsigned int i = mad->init_len; + while (mad->hex[i] && mad->hex[i] == get_hex_char_from_oid(oid, i)) + i++; + + if (i < GIT_MAX_RAWSZ && i >= mad->cur_len) + mad->cur_len = i + 1; + + return 0; +} + +static void find_abbrev_len_for_pack(struct packed_git *p, + struct min_abbrev_data *mad) +{ + int match = 0; + uint32_t num, last, first = 0; + struct object_id oid; + + if (open_pack_index(p) || !p->num_objects) + return; + + num = p->num_objects; + last = num; + while (first < last) { + uint32_t mid = first + (last - first) / 2; + const unsigned char *current; + int cmp; + + current = nth_packed_object_sha1(p, mid); + cmp = hashcmp(mad->hash, current); + if (!cmp) { + match = 1; + first = mid; + break; + } + if (cmp > 0) { + first = mid + 1; + continue; + } + last = mid; + } + + /* + * first is now the position in the packfile where we would insert + * mad->hash if it does not exist (or the position of mad->hash if + * it does exist). Hence, we consider a maximum of three objects + * nearby for the abbreviation length. + */ + mad->init_len = 0; + if (!match) { + nth_packed_object_oid(&oid, p, first); + extend_abbrev_len(&oid, mad); + } else if (first < num - 1) { + nth_packed_object_oid(&oid, p, first + 1); + extend_abbrev_len(&oid, mad); + } + if (first > 0) { + nth_packed_object_oid(&oid, p, first - 1); + extend_abbrev_len(&oid, mad); + } + mad->init_len = mad->cur_len; +} + +static void find_abbrev_len_packed(struct min_abbrev_data *mad) { - int status, exists; + struct packed_git *p; + + prepare_packed_git(); + for (p = packed_git; p; p = p->next) + find_abbrev_len_for_pack(p, mad); +} +int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len) +{ + struct disambiguate_state ds; + struct min_abbrev_data mad; + struct object_id oid_ret; if (len < 0) { unsigned long count = approximate_object_count(); /* @@@ -599,26 -503,19 +599,26 @@@ sha1_to_hex_r(hex, sha1); if (len == GIT_SHA1_HEXSZ || !len) return GIT_SHA1_HEXSZ; - exists = has_sha1_file(sha1); - while (len < GIT_SHA1_HEXSZ) { - struct object_id oid_ret; - status = get_short_oid(hex, len, &oid_ret, GET_OID_QUIETLY); - if (exists - ? !status - : status == SHORT_NAME_NOT_FOUND) { - hex[len] = 0; - return len; - } - len++; - } - return len; + + mad.init_len = len; + mad.cur_len = len; + mad.hex = hex; + mad.hash = sha1; + + find_abbrev_len_packed(&mad); + + if (init_object_disambiguation(hex, mad.cur_len, &ds) < 0) + return -1; + + ds.fn = extend_abbrev_len; + ds.always_call_fn = 1; + ds.cb_data = (void *)&mad; + + find_short_object_filename(&ds); + (void)finish_object_disambiguation(&ds, &oid_ret); + + hex[mad.cur_len] = 0; + return mad.cur_len; } const char *find_unique_abbrev(const unsigned char *sha1, int len) @@@ -706,7 -603,7 +706,7 @@@ static int get_oid_basic(const char *st if (len == GIT_SHA1_HEXSZ && !get_oid_hex(str, oid)) { if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) { - refs_found = dwim_ref(str, len, tmp_oid.hash, &real_ref); + refs_found = dwim_ref(str, len, &tmp_oid, &real_ref); if (refs_found > 0) { warning(warn_msg, len, str); if (advice_object_name_warning) @@@ -757,11 -654,11 +757,11 @@@ if (!len && reflog_len) /* allow "@{...}" to mean the current branch reflog */ - refs_found = dwim_ref("HEAD", 4, oid->hash, &real_ref); + refs_found = dwim_ref("HEAD", 4, oid, &real_ref); else if (reflog_len) - refs_found = dwim_log(str, len, oid->hash, &real_ref); + refs_found = dwim_log(str, len, oid, &real_ref); else - refs_found = dwim_ref(str, len, oid->hash, &real_ref); + refs_found = dwim_ref(str, len, oid, &real_ref); if (!refs_found) return -1; @@@ -800,7 -697,7 +800,7 @@@ return -1; } } - if (read_ref_at(real_ref, flags, at_time, nth, oid->hash, NULL, + if (read_ref_at(real_ref, flags, at_time, nth, oid, NULL, &co_time, &co_tz, &co_cnt)) { if (!len) { if (starts_with(real_ref, "refs/heads/")) { @@@ -1434,13 -1331,20 +1434,23 @@@ void strbuf_branchname(struct strbuf *s int strbuf_check_branch_ref(struct strbuf *sb, const char *name) { - strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL); + if (startup_info->have_repository) + strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL); + else + strbuf_addstr(sb, name); - if (name[0] == '-') - return -1; + + /* + * This splice must be done even if we end up rejecting the + * name; builtin/branch.c::copy_or_rename_branch() still wants + * to see what the name expanded to so that "branch -m" can be + * used as a tool to correct earlier mistakes. + */ strbuf_splice(sb, 0, 0, "refs/heads/", 11); + + if (*name == '-' || + !strcmp(sb->buf, "refs/heads/HEAD")) + return -1; + return check_refname_format(sb->buf, 0); }