From 62e09ce998dd7f6b844deb650101c743a5c4ce50 Mon Sep 17 00:00:00 2001 From: Carlos Rica Date: Fri, 20 Jul 2007 01:42:28 +0200 Subject: Make git tag a builtin. This replaces the script "git-tag.sh" with "builtin-tag.c". The existing test suite for "git tag" guarantees the compatibility with the features provided by the script version. There are some minor changes in the behaviour of "git tag" here: "git tag -v" now can get more than one tag to verify, like "git tag -d" does, "git tag" with no arguments prints all tags, more like "git branch" does, and "git tag -n" also prints all tags with annotations (without needing -l). Tests and documentation were also updated to reflect these changes. The program is currently calling the script "git verify-tag" for verify. This can be changed porting it to C and calling its functions directly from builtin-tag.c. Signed-off-by: Carlos Rica Signed-off-by: Junio C Hamano --- builtin-tag.c | 450 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 450 insertions(+) create mode 100644 builtin-tag.c (limited to 'builtin-tag.c') diff --git a/builtin-tag.c b/builtin-tag.c new file mode 100644 index 000000000..507f51076 --- /dev/null +++ b/builtin-tag.c @@ -0,0 +1,450 @@ +/* + * Builtin "git tag" + * + * Copyright (c) 2007 Kristian Høgsberg , + * Carlos Rica + * Based on git-tag.sh and mktag.c by Linus Torvalds. + */ + +#include "cache.h" +#include "builtin.h" +#include "refs.h" +#include "tag.h" +#include "run-command.h" + +static const char builtin_tag_usage[] = + "git-tag [-n []] -l [] | [-a | -s | -u ] [-f | -d | -v] [-m | -F ] []"; + +static char signingkey[1000]; + +static void launch_editor(const char *path, char **buffer, unsigned long *len) +{ + const char *editor, *terminal; + struct child_process child; + const char *args[3]; + int fd; + + editor = getenv("VISUAL"); + if (!editor) + editor = getenv("EDITOR"); + + terminal = getenv("TERM"); + if (!editor && (!terminal || !strcmp(terminal, "dumb"))) { + fprintf(stderr, + "Terminal is dumb but no VISUAL nor EDITOR defined.\n" + "Please supply the message using either -m or -F option.\n"); + exit(1); + } + + if (!editor) + editor = "vi"; + + memset(&child, 0, sizeof(child)); + child.argv = args; + args[0] = editor; + args[1] = path; + args[2] = NULL; + + if (run_command(&child)) + die("There was a problem with the editor %s.", editor); + + fd = open(path, O_RDONLY); + if (fd < 0) + die("could not open '%s': %s", path, strerror(errno)); + if (read_fd(fd, buffer, len)) { + free(*buffer); + die("could not read message file '%s': %s", + path, strerror(errno)); + } + close(fd); +} + +struct tag_filter { + const char *pattern; + int lines; +}; + +#define PGP_SIGNATURE "-----BEGIN PGP SIGNATURE-----" + +static int show_reference(const char *refname, const unsigned char *sha1, + int flag, void *cb_data) +{ + struct tag_filter *filter = cb_data; + + if (!fnmatch(filter->pattern, refname, 0)) { + int i; + unsigned long size; + enum object_type type; + char *buf, *sp, *eol; + size_t len; + + if (!filter->lines) { + printf("%s\n", refname); + return 0; + } + printf("%-15s ", refname); + + sp = buf = read_sha1_file(sha1, &type, &size); + if (!buf || !size) + return 0; + /* skip header */ + while (sp + 1 < buf + size && + !(sp[0] == '\n' && sp[1] == '\n')) + sp++; + /* only take up to "lines" lines, and strip the signature */ + for (i = 0, sp += 2; i < filter->lines && sp < buf + size && + prefixcmp(sp, PGP_SIGNATURE "\n"); + i++) { + if (i) + printf("\n "); + eol = memchr(sp, '\n', size - (sp - buf)); + len = eol ? eol - sp : size - (sp - buf); + fwrite(sp, len, 1, stdout); + if (!eol) + break; + sp = eol + 1; + } + putchar('\n'); + free(buf); + } + + return 0; +} + +static int list_tags(const char *pattern, int lines) +{ + struct tag_filter filter; + char *newpattern; + + if (pattern == NULL) + pattern = ""; + + /* prepend/append * to the shell pattern: */ + newpattern = xmalloc(strlen(pattern) + 3); + sprintf(newpattern, "*%s*", pattern); + + filter.pattern = newpattern; + filter.lines = lines; + + for_each_tag_ref(show_reference, (void *) &filter); + + free(newpattern); + + return 0; +} + +typedef int (*func_tag)(const char *name, const char *ref, + const unsigned char *sha1); + +static int do_tag_names(const char **argv, func_tag fn) +{ + const char **p; + char ref[PATH_MAX]; + int had_error = 0; + unsigned char sha1[20]; + + for (p = argv; *p; p++) { + if (snprintf(ref, sizeof(ref), "refs/tags/%s", *p) + >= sizeof(ref)) { + error("tag name too long: %.*s...", 50, *p); + had_error = 1; + continue; + } + if (!resolve_ref(ref, sha1, 1, NULL)) { + error("tag '%s' not found.", *p); + had_error = 1; + continue; + } + if (fn(*p, ref, sha1)) + had_error = 1; + } + return had_error; +} + +static int delete_tag(const char *name, const char *ref, + const unsigned char *sha1) +{ + if (delete_ref(ref, sha1)) + return 1; + printf("Deleted tag '%s'\n", name); + return 0; +} + +static int verify_tag(const char *name, const char *ref, + const unsigned char *sha1) +{ + const char *argv_verify_tag[] = {"git-verify-tag", + "-v", "SHA1_HEX", NULL}; + argv_verify_tag[2] = sha1_to_hex(sha1); + + if (run_command_v_opt(argv_verify_tag, 0)) + return error("could not verify the tag '%s'", name); + return 0; +} + +static ssize_t do_sign(char *buffer, size_t size, size_t max) +{ + struct child_process gpg; + const char *args[4]; + char *bracket; + int len; + + if (!*signingkey) { + if (strlcpy(signingkey, git_committer_info(1), + sizeof(signingkey)) >= sizeof(signingkey)) + return error("committer info too long."); + bracket = strchr(signingkey, '>'); + if (bracket) + bracket[1] = '\0'; + } + + memset(&gpg, 0, sizeof(gpg)); + gpg.argv = args; + gpg.in = -1; + gpg.out = -1; + args[0] = "gpg"; + args[1] = "-bsau"; + args[2] = signingkey; + args[3] = NULL; + + if (start_command(&gpg)) + return error("could not run gpg."); + + write_or_die(gpg.in, buffer, size); + close(gpg.in); + gpg.close_in = 0; + len = read_in_full(gpg.out, buffer + size, max - size); + + finish_command(&gpg); + + if (len == max - size) + return error("could not read the entire signature from gpg."); + + return size + len; +} + +static const char tag_template[] = + "\n" + "#\n" + "# Write a tag message\n" + "#\n"; + +static int git_tag_config(const char *var, const char *value) +{ + if (!strcmp(var, "user.signingkey")) { + if (!value) + die("user.signingkey without value"); + if (strlcpy(signingkey, value, sizeof(signingkey)) + >= sizeof(signingkey)) + die("user.signingkey value too long"); + return 0; + } + + return git_default_config(var, value); +} + +#define MAX_SIGNATURE_LENGTH 1024 +/* message must be NULL or allocated, it will be reallocated and freed */ +static void create_tag(const unsigned char *object, const char *tag, + char *message, int sign, unsigned char *result) +{ + enum object_type type; + char header_buf[1024], *buffer; + int header_len, max_size; + unsigned long size; + + type = sha1_object_info(object, NULL); + if (type <= 0) + die("bad object type."); + + header_len = snprintf(header_buf, sizeof(header_buf), + "object %s\n" + "type %s\n" + "tag %s\n" + "tagger %s\n\n", + sha1_to_hex(object), + typename(type), + tag, + git_committer_info(1)); + + if (header_len >= sizeof(header_buf)) + die("tag header too big."); + + if (!message) { + char *path; + int fd; + + /* write the template message before editing: */ + path = xstrdup(git_path("TAG_EDITMSG")); + fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600); + if (fd < 0) + die("could not create file '%s': %s", + path, strerror(errno)); + write_or_die(fd, tag_template, strlen(tag_template)); + close(fd); + + launch_editor(path, &buffer, &size); + + unlink(path); + free(path); + } + else { + buffer = message; + size = strlen(message); + } + + size = stripspace(buffer, size, 1); + + if (!message && !size) + die("no tag message?"); + + /* insert the header and add the '\n' if needed: */ + max_size = header_len + size + (sign ? MAX_SIGNATURE_LENGTH : 0) + 1; + buffer = xrealloc(buffer, max_size); + if (size) + buffer[size++] = '\n'; + memmove(buffer + header_len, buffer, size); + memcpy(buffer, header_buf, header_len); + size += header_len; + + if (sign) { + size = do_sign(buffer, size, max_size); + if (size < 0) + die("unable to sign the tag"); + } + + if (write_sha1_file(buffer, size, tag_type, result) < 0) + die("unable to write tag file"); + free(buffer); +} + +int cmd_tag(int argc, const char **argv, const char *prefix) +{ + unsigned char object[20], prev[20]; + int annotate = 0, sign = 0, force = 0, lines = 0; + char *message = NULL; + char ref[PATH_MAX]; + const char *object_ref, *tag; + int i; + struct ref_lock *lock; + + git_config(git_tag_config); + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + + if (arg[0] != '-') + break; + if (!strcmp(arg, "-a")) { + annotate = 1; + continue; + } + if (!strcmp(arg, "-s")) { + annotate = 1; + sign = 1; + continue; + } + if (!strcmp(arg, "-f")) { + force = 1; + continue; + } + if (!strcmp(arg, "-n")) { + if (i + 1 == argc || *argv[i + 1] == '-') + /* no argument */ + lines = 1; + else + lines = isdigit(*argv[++i]) ? + atoi(argv[i]) : 1; + continue; + } + if (!strcmp(arg, "-m")) { + annotate = 1; + i++; + if (i == argc) + die("option -m needs an argument."); + message = xstrdup(argv[i]); + continue; + } + if (!strcmp(arg, "-F")) { + unsigned long len; + int fd; + + annotate = 1; + i++; + if (i == argc) + die("option -F needs an argument."); + + if (!strcmp(argv[i], "-")) + fd = 0; + else { + fd = open(argv[i], O_RDONLY); + if (fd < 0) + die("could not open '%s': %s", + argv[i], strerror(errno)); + } + len = 1024; + message = xmalloc(len); + if (read_fd(fd, &message, &len)) { + free(message); + die("cannot read %s", argv[i]); + } + continue; + } + if (!strcmp(arg, "-u")) { + annotate = 1; + sign = 1; + i++; + if (i == argc) + die("option -u needs an argument."); + if (strlcpy(signingkey, argv[i], sizeof(signingkey)) + >= sizeof(signingkey)) + die("argument to option -u too long"); + continue; + } + if (!strcmp(arg, "-l")) { + return list_tags(argv[i + 1], lines); + } + if (!strcmp(arg, "-d")) { + return do_tag_names(argv + i + 1, delete_tag); + } + if (!strcmp(arg, "-v")) { + return do_tag_names(argv + i + 1, verify_tag); + } + usage(builtin_tag_usage); + } + + if (i == argc) { + if (annotate) + usage(builtin_tag_usage); + return list_tags(NULL, lines); + } + tag = argv[i++]; + + object_ref = i < argc ? argv[i] : "HEAD"; + if (i + 1 < argc) + die("too many params"); + + if (get_sha1(object_ref, object)) + die("Failed to resolve '%s' as a valid ref.", object_ref); + + if (snprintf(ref, sizeof(ref), "refs/tags/%s", tag) >= sizeof(ref)) + die("tag name too long: %.*s...", 50, tag); + if (check_ref_format(ref)) + die("'%s' is not a valid tag name.", tag); + + if (!resolve_ref(ref, prev, 1, NULL)) + hashclr(prev); + else if (!force) + die("tag '%s' already exists", tag); + + if (annotate) + create_tag(object, tag, message, sign, object); + + lock = lock_any_ref_for_update(ref, prev, 0); + if (!lock) + die("%s: cannot lock the ref", ref); + if (write_ref_sha1(lock, object, NULL) < 0) + die("%s: cannot update the ref", ref); + + return 0; +} -- cgit v1.2.1