From 358ddb62cfd03bba1ca2f1ae8e81b9510f42ea9a Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 15 Sep 2006 11:19:32 -0700 Subject: [PATCH] Add "git show-ref" builtin command It's kind of like "git peek-remote", but works only locally (and thus avoids the whole overhead of git_connect()) and has some extra verification features. For example, it allows you to filter the results, and to choose whether you want the tag dereferencing or not. You can also use it to just test whether a particular ref exists. For example: git show-ref master will show all references called "master", whether tags or heads or anything else, and regardless of how deep in the reference naming hierarchy they are (so it would show "refs/heads/master" but also "refs/remote/other-repo/master"). When using the "--verify" flag, the command requires an exact ref path: git show-ref --verify refs/heads/master will only match the exact branch called "master". If nothing matches, show-ref will return an error code of 1, and in the case of verification, it will show an error message. For scripting, you can ask it to be quiet with the "--quiet" flag, which allows you to do things like git-show-ref --quiet --verify -- "refs/heads/$headname" || echo "$headname is not a valid branch" to check whether a particular branch exists or not (notice how we don't actually want to show any results, and we want to use the full refname for it in order to not trigger the problem with ambiguous partial matches). To show only tags, or only proper branch heads, use "--tags" and/or "--heads" respectively (using both means that it shows tags _and_ heads, but not other random references under the refs/ subdirectory). To do automatic tag object dereferencing, use the "-d" or "--dereference" flag, so you can do git show-ref --tags --dereference to get a listing of all tags together with what they dereference. Signed-off-by: Linus Torvalds Signed-off-by: Junio C Hamano --- Makefile | 3 +- builtin-show-ref.c | 112 +++++++++++++++++++++++++++++++++++++++++++++ builtin.h | 1 + git.c | 1 + 4 files changed, 116 insertions(+), 1 deletion(-) create mode 100644 builtin-show-ref.c diff --git a/Makefile b/Makefile index 7b3114f3a..c3651384c 100644 --- a/Makefile +++ b/Makefile @@ -295,7 +295,8 @@ BUILTIN_OBJS = \ builtin-upload-tar.o \ builtin-verify-pack.o \ builtin-write-tree.o \ - builtin-zip-tree.o + builtin-zip-tree.o \ + builtin-show-ref.o GITLIBS = $(LIB_FILE) $(XDIFF_LIB) LIBS = $(GITLIBS) -lz diff --git a/builtin-show-ref.c b/builtin-show-ref.c new file mode 100644 index 000000000..161b2367e --- /dev/null +++ b/builtin-show-ref.c @@ -0,0 +1,112 @@ +#include "cache.h" +#include "refs.h" +#include "object.h" +#include "tag.h" + +static const char show_ref_usage[] = "git show-ref [-q|--quiet] [--verify] [-h|--head] [-d|--deref] [--tags] [--heads] [--] [pattern*]"; + +static int deref_tags = 0, show_head = 0, tags_only = 0, heads_only = 0, found_match = 0, verify = 0, quiet = 0; +static const char **pattern; + +static int show_ref(const char *refname, const unsigned char *sha1) +{ + struct object *obj; + + if (tags_only || heads_only) { + int match; + + match = heads_only && !strncmp(refname, "refs/heads/", 11); + match |= tags_only && !strncmp(refname, "refs/tags/", 10); + if (!match) + return 0; + } + if (pattern) { + int reflen = strlen(refname); + const char **p = pattern, *m; + while ((m = *p++) != NULL) { + int len = strlen(m); + if (len > reflen) + continue; + if (memcmp(m, refname + reflen - len, len)) + continue; + if (len == reflen) + goto match; + /* "--verify" requires an exact match */ + if (verify) + continue; + if (refname[reflen - len - 1] == '/') + goto match; + } + return 0; + } + +match: + found_match++; + obj = parse_object(sha1); + if (!obj) { + if (quiet) + return 0; + die("git-show-ref: bad ref %s (%s)", refname, sha1_to_hex(sha1)); + } + if (quiet) + return 0; + printf("%s %s\n", sha1_to_hex(sha1), refname); + if (deref_tags && obj->type == OBJ_TAG) { + obj = deref_tag(obj, refname, 0); + printf("%s %s^{}\n", sha1_to_hex(obj->sha1), refname); + } + return 0; +} + +int cmd_show_ref(int argc, const char **argv, const char *prefix) +{ + int i; + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + if (*arg != '-') { + pattern = argv + i; + break; + } + if (!strcmp(arg, "--")) { + pattern = argv + i + 1; + if (!*pattern) + pattern = NULL; + break; + } + if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) { + quiet = 1; + continue; + } + if (!strcmp(arg, "-h") || !strcmp(arg, "--head")) { + show_head = 1; + continue; + } + if (!strcmp(arg, "-d") || !strcmp(arg, "--dereference")) { + deref_tags = 1; + continue; + } + if (!strcmp(arg, "--verify")) { + verify = 1; + continue; + } + if (!strcmp(arg, "--tags")) { + tags_only = 1; + continue; + } + if (!strcmp(arg, "--heads")) { + heads_only = 1; + continue; + } + usage(show_ref_usage); + } + if (show_head) + head_ref(show_ref); + for_each_ref(show_ref); + if (!found_match) { + if (verify && !quiet) + die("No match"); + return 1; + } + return 0; +} diff --git a/builtin.h b/builtin.h index 398eafbf9..a7242beeb 100644 --- a/builtin.h +++ b/builtin.h @@ -60,5 +60,6 @@ extern int cmd_version(int argc, const char **argv, const char *prefix); extern int cmd_whatchanged(int argc, const char **argv, const char *prefix); extern int cmd_write_tree(int argc, const char **argv, const char *prefix); extern int cmd_verify_pack(int argc, const char **argv, const char *prefix); +extern int cmd_show_ref(int argc, const char **argv, const char *prefix); #endif diff --git a/git.c b/git.c index 8c182a5f5..fedd53683 100644 --- a/git.c +++ b/git.c @@ -266,6 +266,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp) { "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER }, { "write-tree", cmd_write_tree, RUN_SETUP }, { "verify-pack", cmd_verify_pack }, + { "show-ref", cmd_show_ref, RUN_SETUP }, }; int i; -- 2.26.2