mirror of
https://github.com/git/git
synced 2024-08-25 10:45:59 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
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 <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
383 lines
9.1 KiB
C
383 lines
9.1 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include "git-compat-util.h"
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#include "exec_cmd.h"
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#include "cache.h"
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#include "quote.h"
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#include "builtin.h"
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const char git_usage_string[] =
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"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
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static void prepend_to_path(const char *dir, int len)
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{
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const char *old_path = getenv("PATH");
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char *path;
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int path_len = len;
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if (!old_path)
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old_path = "/usr/local/bin:/usr/bin:/bin";
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path_len = len + strlen(old_path) + 1;
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path = xmalloc(path_len + 1);
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memcpy(path, dir, len);
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path[len] = ':';
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memcpy(path + len + 1, old_path, path_len - len);
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setenv("PATH", path, 1);
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free(path);
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}
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static int handle_options(const char*** argv, int* argc)
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{
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int handled = 0;
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
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break;
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/*
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* Check remaining flags.
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*/
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if (!strncmp(cmd, "--exec-path", 11)) {
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cmd += 11;
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if (*cmd == '=')
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git_set_exec_path(cmd + 1);
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else {
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puts(git_exec_path());
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exit(0);
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}
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} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
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setup_pager();
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} else if (!strcmp(cmd, "--git-dir")) {
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if (*argc < 1)
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return -1;
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setenv("GIT_DIR", (*argv)[1], 1);
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(*argv)++;
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(*argc)--;
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} else if (!strncmp(cmd, "--git-dir=", 10)) {
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setenv("GIT_DIR", cmd + 10, 1);
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} else if (!strcmp(cmd, "--bare")) {
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static char git_dir[1024];
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setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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usage(git_usage_string);
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}
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(*argv)++;
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(*argc)--;
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handled++;
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}
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return handled;
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}
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static const char *alias_command;
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static char *alias_string;
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static int git_alias_config(const char *var, const char *value)
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{
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if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
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alias_string = xstrdup(value);
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}
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return 0;
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}
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static int split_cmdline(char *cmdline, const char ***argv)
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{
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int src, dst, count = 0, size = 16;
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char quoted = 0;
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*argv = malloc(sizeof(char*) * size);
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/* split alias_string */
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(*argv)[count++] = cmdline;
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for (src = dst = 0; cmdline[src];) {
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char c = cmdline[src];
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if (!quoted && isspace(c)) {
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cmdline[dst++] = 0;
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while (cmdline[++src]
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&& isspace(cmdline[src]))
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; /* skip */
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if (count >= size) {
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size += 16;
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*argv = xrealloc(*argv, sizeof(char*) * size);
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}
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(*argv)[count++] = cmdline + dst;
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} else if(!quoted && (c == '\'' || c == '"')) {
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quoted = c;
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src++;
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} else if (c == quoted) {
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quoted = 0;
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src++;
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} else {
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if (c == '\\' && quoted != '\'') {
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src++;
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c = cmdline[src];
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if (!c) {
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free(*argv);
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*argv = NULL;
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return error("cmdline ends with \\");
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}
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}
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cmdline[dst++] = c;
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src++;
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}
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}
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cmdline[dst] = 0;
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if (quoted) {
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free(*argv);
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*argv = NULL;
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return error("unclosed quote");
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}
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return count;
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}
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static int handle_alias(int *argcp, const char ***argv)
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{
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int nongit = 0, ret = 0, saved_errno = errno;
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const char *subdir;
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int count, option_count;
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const char** new_argv;
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subdir = setup_git_directory_gently(&nongit);
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alias_command = (*argv)[0];
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git_config(git_alias_config);
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if (alias_string) {
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count = split_cmdline(alias_string, &new_argv);
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option_count = handle_options(&new_argv, &count);
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memmove(new_argv - option_count, new_argv,
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count * sizeof(char *));
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new_argv -= option_count;
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if (count < 1)
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die("empty alias for %s", alias_command);
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if (!strcmp(alias_command, new_argv[0]))
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die("recursive alias: %s", alias_command);
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trace_argv_printf(new_argv, count,
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"trace: alias expansion: %s =>",
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alias_command);
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new_argv = xrealloc(new_argv, sizeof(char*) *
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(count + *argcp + 1));
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/* insert after command name */
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memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
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new_argv[count+*argcp] = NULL;
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*argv = new_argv;
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*argcp += count - 1;
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ret = 1;
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}
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if (subdir)
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chdir(subdir);
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errno = saved_errno;
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return ret;
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}
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const char git_version_string[] = GIT_VERSION;
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#define RUN_SETUP (1<<0)
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#define USE_PAGER (1<<1)
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static void handle_internal_command(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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static struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, const char *);
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int option;
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} commands[] = {
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{ "add", cmd_add, RUN_SETUP },
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{ "apply", cmd_apply },
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{ "cat-file", cmd_cat_file, RUN_SETUP },
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{ "checkout-index", cmd_checkout_index, RUN_SETUP },
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{ "check-ref-format", cmd_check_ref_format },
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{ "commit-tree", cmd_commit_tree, RUN_SETUP },
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{ "count-objects", cmd_count_objects, RUN_SETUP },
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{ "diff", cmd_diff, RUN_SETUP },
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{ "diff-files", cmd_diff_files, RUN_SETUP },
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{ "diff-index", cmd_diff_index, RUN_SETUP },
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{ "diff-stages", cmd_diff_stages, RUN_SETUP },
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{ "diff-tree", cmd_diff_tree, RUN_SETUP },
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{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
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{ "format-patch", cmd_format_patch, RUN_SETUP },
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{ "get-tar-commit-id", cmd_get_tar_commit_id },
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{ "grep", cmd_grep, RUN_SETUP },
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{ "help", cmd_help },
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{ "init-db", cmd_init_db },
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{ "log", cmd_log, RUN_SETUP | USE_PAGER },
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{ "ls-files", cmd_ls_files, RUN_SETUP },
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{ "ls-tree", cmd_ls_tree, RUN_SETUP },
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{ "mailinfo", cmd_mailinfo },
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{ "mailsplit", cmd_mailsplit },
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{ "mv", cmd_mv, RUN_SETUP },
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{ "name-rev", cmd_name_rev, RUN_SETUP },
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{ "pack-objects", cmd_pack_objects, RUN_SETUP },
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{ "prune", cmd_prune, RUN_SETUP },
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{ "prune-packed", cmd_prune_packed, RUN_SETUP },
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{ "push", cmd_push, RUN_SETUP },
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{ "read-tree", cmd_read_tree, RUN_SETUP },
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{ "repo-config", cmd_repo_config },
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{ "rev-list", cmd_rev_list, RUN_SETUP },
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{ "rev-parse", cmd_rev_parse, RUN_SETUP },
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{ "rm", cmd_rm, RUN_SETUP },
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{ "show-branch", cmd_show_branch, RUN_SETUP },
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{ "show", cmd_show, RUN_SETUP | USE_PAGER },
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{ "stripspace", cmd_stripspace },
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{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
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{ "tar-tree", cmd_tar_tree, RUN_SETUP },
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{ "zip-tree", cmd_zip_tree, RUN_SETUP },
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{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
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{ "update-index", cmd_update_index, RUN_SETUP },
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{ "update-ref", cmd_update_ref, RUN_SETUP },
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{ "upload-tar", cmd_upload_tar },
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{ "version", cmd_version },
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{ "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
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{ "write-tree", cmd_write_tree, RUN_SETUP },
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{ "verify-pack", cmd_verify_pack },
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{ "show-ref", cmd_show_ref, RUN_SETUP },
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};
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int i;
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/* Turn "git cmd --help" into "git help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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const char *prefix;
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if (strcmp(p->cmd, cmd))
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continue;
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prefix = NULL;
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if (p->option & RUN_SETUP)
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prefix = setup_git_directory();
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if (p->option & USE_PAGER)
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setup_pager();
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trace_argv_printf(argv, argc, "trace: built-in: git");
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exit(p->fn(argc, argv, prefix));
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}
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}
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int main(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0] ? argv[0] : "git-help";
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char *slash = strrchr(cmd, '/');
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const char *exec_path = NULL;
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int done_alias = 0;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if it's an absolute path and we don't have
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* anything better.
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*/
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if (slash) {
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*slash++ = 0;
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if (*cmd == '/')
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exec_path = cmd;
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!strncmp(cmd, "git-", 4)) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv, envp);
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die("cannot handle %s internally", cmd);
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}
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/* Look for flags.. */
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argv++;
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argc--;
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handle_options(&argv, &argc);
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if (argc > 0) {
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if (!strncmp(argv[0], "--", 2))
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argv[0] += 2;
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} else {
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/* Default command: "help" */
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argv[0] = "help";
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argc = 1;
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}
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cmd = argv[0];
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/*
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* We search for git commands in the following order:
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* - git_exec_path()
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* - the path of the "git" command if we could find it
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* in $0
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* - the regular PATH.
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*/
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if (exec_path)
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prepend_to_path(exec_path, strlen(exec_path));
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exec_path = git_exec_path();
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prepend_to_path(exec_path, strlen(exec_path));
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while (1) {
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/* See if it's an internal command */
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handle_internal_command(argc, argv, envp);
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/* .. then try the external ones */
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execv_git_cmd(argv);
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/* It could be an alias -- this works around the insanity
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* of overriding "git log" with "git show" by having
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* alias.log = show
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*/
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if (done_alias || !handle_alias(&argc, &argv))
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break;
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done_alias = 1;
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}
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if (errno == ENOENT)
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help_unknown_cmd(cmd);
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fprintf(stderr, "Failed to run command '%s': %s\n",
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cmd, strerror(errno));
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return 1;
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}
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