diff options
Diffstat (limited to 'git.c')
| -rw-r--r-- | git.c | 513 |
1 files changed, 513 insertions, 0 deletions
@@ -0,0 +1,513 @@ +#include "builtin.h" +#include "exec_cmd.h" +#include "cache.h" +#include "quote.h" + +const char git_usage_string[] = + "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]"; + +const char git_more_info_string[] = + "See 'git help COMMAND' for more information on a specific command."; + +static int use_pager = -1; +struct pager_config { + const char *cmd; + int val; +}; + +static int pager_command_config(const char *var, const char *value, void *data) +{ + struct pager_config *c = data; + if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd)) + c->val = git_config_bool(var, value); + return 0; +} + +/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */ +int check_pager_config(const char *cmd) +{ + struct pager_config c; + c.cmd = cmd; + c.val = -1; + git_config(pager_command_config, &c); + return c.val; +} + +static void commit_pager_choice(void) { + switch (use_pager) { + case 0: + setenv("GIT_PAGER", "cat", 1); + break; + case 1: + setup_pager(); + break; + default: + break; + } +} + +static int handle_options(const char*** argv, int* argc, int* envchanged) +{ + int handled = 0; + + while (*argc > 0) { + const char *cmd = (*argv)[0]; + if (cmd[0] != '-') + break; + + /* + * For legacy reasons, the "version" and "help" + * commands can be written with "--" prepended + * to make them look like flags. + */ + if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version")) + break; + + /* + * Check remaining flags. + */ + if (!prefixcmp(cmd, "--exec-path")) { + cmd += 11; + if (*cmd == '=') + git_set_argv_exec_path(cmd + 1); + else { + puts(git_exec_path()); + exit(0); + } + } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { + use_pager = 1; + } else if (!strcmp(cmd, "--no-pager")) { + use_pager = 0; + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--git-dir")) { + if (*argc < 2) { + fprintf(stderr, "No directory given for --git-dir.\n" ); + usage(git_usage_string); + } + setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + handled++; + } else if (!prefixcmp(cmd, "--git-dir=")) { + setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--work-tree")) { + if (*argc < 2) { + fprintf(stderr, "No directory given for --work-tree.\n" ); + usage(git_usage_string); + } + setenv(GIT_WORK_TREE_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; + (*argv)++; + (*argc)--; + } else if (!prefixcmp(cmd, "--work-tree=")) { + setenv(GIT_WORK_TREE_ENVIRONMENT, cmd + 12, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--bare")) { + static char git_dir[PATH_MAX+1]; + is_bare_repository_cfg = 1; + setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 0); + if (envchanged) + *envchanged = 1; + } else { + fprintf(stderr, "Unknown option: %s\n", cmd); + usage(git_usage_string); + } + + (*argv)++; + (*argc)--; + handled++; + } + return handled; +} + +static int handle_alias(int *argcp, const char ***argv) +{ + int envchanged = 0, ret = 0, saved_errno = errno; + const char *subdir; + int count, option_count; + const char** new_argv; + const char *alias_command; + char *alias_string; + int unused_nongit; + + subdir = setup_git_directory_gently(&unused_nongit); + + alias_command = (*argv)[0]; + alias_string = alias_lookup(alias_command); + if (alias_string) { + if (alias_string[0] == '!') { + if (*argcp > 1) { + struct strbuf buf; + + strbuf_init(&buf, PATH_MAX); + strbuf_addstr(&buf, alias_string); + sq_quote_argv(&buf, (*argv) + 1, PATH_MAX); + free(alias_string); + alias_string = buf.buf; + } + trace_printf("trace: alias to shell cmd: %s => %s\n", + alias_command, alias_string + 1); + ret = system(alias_string + 1); + if (ret >= 0 && WIFEXITED(ret) && + WEXITSTATUS(ret) != 127) + exit(WEXITSTATUS(ret)); + die("Failed to run '%s' when expanding alias '%s'\n", + alias_string + 1, alias_command); + } + count = split_cmdline(alias_string, &new_argv); + if (count < 0) + die("Bad alias.%s string", alias_command); + option_count = handle_options(&new_argv, &count, &envchanged); + if (envchanged) + die("alias '%s' changes environment variables\n" + "You can use '!git' in the alias to do this.", + alias_command); + memmove(new_argv - option_count, new_argv, + count * sizeof(char *)); + new_argv -= option_count; + + if (count < 1) + die("empty alias for %s", alias_command); + + if (!strcmp(alias_command, new_argv[0])) + die("recursive alias: %s", alias_command); + + trace_argv_printf(new_argv, + "trace: alias expansion: %s =>", + alias_command); + + new_argv = xrealloc(new_argv, sizeof(char*) * + (count + *argcp + 1)); + /* insert after command name */ + memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp); + new_argv[count+*argcp] = NULL; + + *argv = new_argv; + *argcp += count - 1; + + ret = 1; + } + + if (subdir) + chdir(subdir); + + errno = saved_errno; + + return ret; +} + +const char git_version_string[] = GIT_VERSION; + +#define RUN_SETUP (1<<0) +#define USE_PAGER (1<<1) +/* + * require working tree to be present -- anything uses this needs + * RUN_SETUP for reading from the configuration file. + */ +#define NEED_WORK_TREE (1<<2) + +struct cmd_struct { + const char *cmd; + int (*fn)(int, const char **, const char *); + int option; +}; + +static int run_command(struct cmd_struct *p, int argc, const char **argv) +{ + int status; + struct stat st; + const char *prefix; + + prefix = NULL; + if (p->option & RUN_SETUP) + prefix = setup_git_directory(); + + if (use_pager == -1 && p->option & RUN_SETUP) + use_pager = check_pager_config(p->cmd); + if (use_pager == -1 && p->option & USE_PAGER) + use_pager = 1; + commit_pager_choice(); + + if (p->option & NEED_WORK_TREE) + setup_work_tree(); + + trace_argv_printf(argv, "trace: built-in: git"); + + status = p->fn(argc, argv, prefix); + if (status) + return status & 0xff; + + /* Somebody closed stdout? */ + if (fstat(fileno(stdout), &st)) + return 0; + /* Ignore write errors for pipes and sockets.. */ + if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode)) + return 0; + + /* Check for ENOSPC and EIO errors.. */ + if (fflush(stdout)) + die("write failure on standard output: %s", strerror(errno)); + if (ferror(stdout)) + die("unknown write failure on standard output"); + if (fclose(stdout)) + die("close failed on standard output: %s", strerror(errno)); + return 0; +} + +static void handle_internal_command(int argc, const char **argv) +{ + const char *cmd = argv[0]; + static struct cmd_struct commands[] = { + { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + { "annotate", cmd_annotate, RUN_SETUP }, + { "apply", cmd_apply }, + { "archive", cmd_archive }, + { "blame", cmd_blame, RUN_SETUP }, + { "branch", cmd_branch, RUN_SETUP }, + { "bundle", cmd_bundle }, + { "cat-file", cmd_cat_file, RUN_SETUP }, + { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE }, + { "checkout-index", cmd_checkout_index, + RUN_SETUP | NEED_WORK_TREE}, + { "check-ref-format", cmd_check_ref_format }, + { "check-attr", cmd_check_attr, RUN_SETUP }, + { "cherry", cmd_cherry, RUN_SETUP }, + { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, + { "clone", cmd_clone }, + { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, + { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, + { "commit-tree", cmd_commit_tree, RUN_SETUP }, + { "config", cmd_config }, + { "count-objects", cmd_count_objects, RUN_SETUP }, + { "describe", cmd_describe, RUN_SETUP }, + { "diff", cmd_diff }, + { "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE }, + { "diff-index", cmd_diff_index, RUN_SETUP }, + { "diff-tree", cmd_diff_tree, RUN_SETUP }, + { "fast-export", cmd_fast_export, RUN_SETUP }, + { "fetch", cmd_fetch, RUN_SETUP }, + { "fetch-pack", cmd_fetch_pack, RUN_SETUP }, + { "fetch--tool", cmd_fetch__tool, RUN_SETUP }, + { "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP }, + { "for-each-ref", cmd_for_each_ref, RUN_SETUP }, + { "format-patch", cmd_format_patch, RUN_SETUP }, + { "fsck", cmd_fsck, RUN_SETUP }, + { "fsck-objects", cmd_fsck, RUN_SETUP }, + { "gc", cmd_gc, RUN_SETUP }, + { "get-tar-commit-id", cmd_get_tar_commit_id }, + { "grep", cmd_grep, RUN_SETUP | USE_PAGER }, + { "help", cmd_help }, +#ifndef NO_CURL + { "http-fetch", cmd_http_fetch, RUN_SETUP }, +#endif + { "init", cmd_init_db }, + { "init-db", cmd_init_db }, + { "log", cmd_log, RUN_SETUP | USE_PAGER }, + { "ls-files", cmd_ls_files, RUN_SETUP }, + { "ls-tree", cmd_ls_tree, RUN_SETUP }, + { "ls-remote", cmd_ls_remote }, + { "mailinfo", cmd_mailinfo }, + { "mailsplit", cmd_mailsplit }, + { "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE }, + { "merge-base", cmd_merge_base, RUN_SETUP }, + { "merge-file", cmd_merge_file }, + { "merge-ours", cmd_merge_ours, RUN_SETUP }, + { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, + { "name-rev", cmd_name_rev, RUN_SETUP }, + { "pack-objects", cmd_pack_objects, RUN_SETUP }, + { "peek-remote", cmd_ls_remote }, + { "pickaxe", cmd_blame, RUN_SETUP }, + { "prune", cmd_prune, RUN_SETUP }, + { "prune-packed", cmd_prune_packed, RUN_SETUP }, + { "push", cmd_push, RUN_SETUP }, + { "read-tree", cmd_read_tree, RUN_SETUP }, + { "reflog", cmd_reflog, RUN_SETUP }, + { "remote", cmd_remote, RUN_SETUP }, + { "repo-config", cmd_config }, + { "rerere", cmd_rerere, RUN_SETUP }, + { "reset", cmd_reset, RUN_SETUP }, + { "rev-list", cmd_rev_list, RUN_SETUP }, + { "rev-parse", cmd_rev_parse }, + { "revert", cmd_revert, RUN_SETUP | NEED_WORK_TREE }, + { "rm", cmd_rm, RUN_SETUP }, + { "send-pack", cmd_send_pack, RUN_SETUP }, + { "shortlog", cmd_shortlog, USE_PAGER }, + { "show-branch", cmd_show_branch, RUN_SETUP }, + { "show", cmd_show, RUN_SETUP | USE_PAGER }, + { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, + { "stripspace", cmd_stripspace }, + { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, + { "tag", cmd_tag, RUN_SETUP }, + { "tar-tree", cmd_tar_tree }, + { "unpack-objects", cmd_unpack_objects, RUN_SETUP }, + { "update-index", cmd_update_index, RUN_SETUP }, + { "update-ref", cmd_update_ref, RUN_SETUP }, + { "upload-archive", cmd_upload_archive }, + { "verify-tag", cmd_verify_tag, RUN_SETUP }, + { "version", cmd_version }, + { "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 }, + { "pack-refs", cmd_pack_refs, RUN_SETUP }, + }; + int i; + static const char ext[] = STRIP_EXTENSION; + + if (sizeof(ext) > 1) { + i = strlen(argv[0]) - strlen(ext); + if (i > 0 && !strcmp(argv[0] + i, ext)) { + char *argv0 = xstrdup(argv[0]); + argv[0] = cmd = argv0; + argv0[i] = '\0'; + } + } + + /* Turn "git cmd --help" into "git help cmd" */ + if (argc > 1 && !strcmp(argv[1], "--help")) { + argv[1] = argv[0]; + argv[0] = cmd = "help"; + } + + for (i = 0; i < ARRAY_SIZE(commands); i++) { + struct cmd_struct *p = commands+i; + if (strcmp(p->cmd, cmd)) + continue; + exit(run_command(p, argc, argv)); + } +} + +static void execv_dashed_external(const char **argv) +{ + struct strbuf cmd; + const char *tmp; + + strbuf_init(&cmd, 0); + strbuf_addf(&cmd, "git-%s", argv[0]); + + /* + * argv[0] must be the git command, but the argv array + * belongs to the caller, and may be reused in + * subsequent loop iterations. Save argv[0] and + * restore it on error. + */ + tmp = argv[0]; + argv[0] = cmd.buf; + + trace_argv_printf(argv, "trace: exec:"); + + /* execvp() can only ever return if it fails */ + execvp(cmd.buf, (char **)argv); + + trace_printf("trace: exec failed: %s\n", strerror(errno)); + + argv[0] = tmp; + + strbuf_release(&cmd); +} + + +int main(int argc, const char **argv) +{ + const char *cmd = argv[0] && *argv[0] ? argv[0] : "git-help"; + char *slash = (char *)cmd + strlen(cmd); + int done_alias = 0; + + /* + * Take the basename of argv[0] as the command + * name, and the dirname as the default exec_path + * if we don't have anything better. + */ + do + --slash; + while (cmd <= slash && !is_dir_sep(*slash)); + if (cmd <= slash) { + *slash++ = 0; + git_set_argv0_path(cmd); + cmd = slash; + } + + /* + * "git-xxxx" is the same as "git xxxx", but we obviously: + * + * - cannot take flags in between the "git" and the "xxxx". + * - cannot execute it externally (since it would just do + * the same thing over again) + * + * So we just directly call the internal command handler, and + * die if that one cannot handle it. + */ + if (!prefixcmp(cmd, "git-")) { + cmd += 4; + argv[0] = cmd; + handle_internal_command(argc, argv); + die("cannot handle %s internally", cmd); + } + + /* Look for flags.. */ + argv++; + argc--; + handle_options(&argv, &argc, NULL); + commit_pager_choice(); + if (argc > 0) { + if (!prefixcmp(argv[0], "--")) + argv[0] += 2; + } else { + /* The user didn't specify a command; give them help */ + printf("usage: %s\n\n", git_usage_string); + list_common_cmds_help(); + printf("\n%s\n", git_more_info_string); + exit(1); + } + cmd = argv[0]; + + /* + * We use PATH to find git commands, but we prepend some higher + * precidence paths: the "--exec-path" option, the GIT_EXEC_PATH + * environment, and the $(gitexecdir) from the Makefile at build + * time. + */ + setup_path(); + + while (1) { + /* See if it's an internal command */ + handle_internal_command(argc, argv); + + /* .. then try the external ones */ + execv_dashed_external(argv); + + /* It could be an alias -- this works around the insanity + * of overriding "git log" with "git show" by having + * alias.log = show + */ + if (done_alias || !handle_alias(&argc, &argv)) + break; + done_alias = 1; + } + + if (errno == ENOENT) { + if (done_alias) { + fprintf(stderr, "Expansion of alias '%s' failed; " + "'%s' is not a git-command\n", + cmd, argv[0]); + exit(1); + } + argv[0] = help_unknown_cmd(cmd); + handle_internal_command(argc, argv); + execv_dashed_external(argv); + } + + fprintf(stderr, "Failed to run command '%s': %s\n", + cmd, strerror(errno)); + + return 1; +} |