diff options
Diffstat (limited to 'git.c')
| -rw-r--r-- | git.c | 826 |
1 files changed, 560 insertions, 266 deletions
@@ -1,36 +1,76 @@ #include "builtin.h" #include "exec_cmd.h" -#include "cache.h" -#include "quote.h" +#include "help.h" +#include "run-command.h" const char git_usage_string[] = - "git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]"; - -static void prepend_to_path(const char *dir, int len) + "git [--version] [--help] [-C <path>] [-c name=value]\n" + " [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]\n" + " [-p | --paginate | --no-pager] [--no-replace-objects] [--bare]\n" + " [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]\n" + " <command> [<args>]"; + +const char git_more_info_string[] = + N_("'git help -a' and 'git help -g' list available subcommands and some\n" + "concept guides. See 'git help <command>' or 'git help <concept>'\n" + "to read about a specific subcommand or concept."); + +static struct startup_info git_startup_info; +static int use_pager = -1; +static char *orig_cwd; +static const char *env_names[] = { + GIT_DIR_ENVIRONMENT, + GIT_WORK_TREE_ENVIRONMENT, + GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, + GIT_PREFIX_ENVIRONMENT +}; +static char *orig_env[4]; +static int saved_environment; + +static void save_env(void) { - const char *old_path = getenv("PATH"); - char *path; - int path_len = len; - - if (!old_path) - old_path = "/usr/local/bin:/usr/bin:/bin"; - - path_len = len + strlen(old_path) + 1; - - path = xmalloc(path_len + 1); - - memcpy(path, dir, len); - path[len] = ':'; - memcpy(path + len + 1, old_path, path_len - len); + int i; + if (saved_environment) + return; + saved_environment = 1; + orig_cwd = xgetcwd(); + for (i = 0; i < ARRAY_SIZE(env_names); i++) { + orig_env[i] = getenv(env_names[i]); + if (orig_env[i]) + orig_env[i] = xstrdup(orig_env[i]); + } +} - setenv("PATH", path, 1); +static void restore_env(void) +{ + int i; + if (orig_cwd && chdir(orig_cwd)) + die_errno("could not move to %s", orig_cwd); + free(orig_cwd); + for (i = 0; i < ARRAY_SIZE(env_names); i++) { + if (orig_env[i]) + setenv(env_names[i], orig_env[i], 1); + else + unsetenv(env_names[i]); + } +} - free(path); +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) +static int handle_options(const char ***argv, int *argc, int *envchanged) { - int handled = 0; + const char **orig_argv = *argv; while (*argc > 0) { const char *cmd = (*argv)[0]; @@ -48,29 +88,130 @@ static int handle_options(const char*** argv, int* argc) /* * Check remaining flags. */ - if (!prefixcmp(cmd, "--exec-path")) { - cmd += 11; + if (skip_prefix(cmd, "--exec-path", &cmd)) { if (*cmd == '=') - git_set_exec_path(cmd + 1); + git_set_argv_exec_path(cmd + 1); else { puts(git_exec_path()); exit(0); } + } else if (!strcmp(cmd, "--html-path")) { + puts(system_path(GIT_HTML_PATH)); + exit(0); + } else if (!strcmp(cmd, "--man-path")) { + puts(system_path(GIT_MAN_PATH)); + exit(0); + } else if (!strcmp(cmd, "--info-path")) { + puts(system_path(GIT_INFO_PATH)); + exit(0); } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { - setup_pager(); + use_pager = 1; + } else if (!strcmp(cmd, "--no-pager")) { + use_pager = 0; + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--no-replace-objects")) { + check_replace_refs = 0; + setenv(NO_REPLACE_OBJECTS_ENVIRONMENT, "1", 1); + 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)--; + } else if (skip_prefix(cmd, "--git-dir=", &cmd)) { + setenv(GIT_DIR_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--namespace")) { + if (*argc < 2) { + fprintf(stderr, "No namespace given for --namespace.\n" ); + usage(git_usage_string); + } + setenv(GIT_NAMESPACE_ENVIRONMENT, (*argv)[1], 1); + if (envchanged) + *envchanged = 1; (*argv)++; (*argc)--; - } else if (!prefixcmp(cmd, "--git-dir=")) { - setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1); + } else if (skip_prefix(cmd, "--namespace=", &cmd)) { + setenv(GIT_NAMESPACE_ENVIRONMENT, cmd, 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 (skip_prefix(cmd, "--work-tree=", &cmd)) { + setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1); + if (envchanged) + *envchanged = 1; } else if (!strcmp(cmd, "--bare")) { - static char git_dir[PATH_MAX+1]; - setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1); + char *cwd = xgetcwd(); + is_bare_repository_cfg = 1; + setenv(GIT_DIR_ENVIRONMENT, cwd, 0); + free(cwd); + setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "-c")) { + if (*argc < 2) { + fprintf(stderr, "-c expects a configuration string\n" ); + usage(git_usage_string); + } + git_config_push_parameter((*argv)[1]); + (*argv)++; + (*argc)--; + } else if (!strcmp(cmd, "--literal-pathspecs")) { + setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--no-literal-pathspecs")) { + setenv(GIT_LITERAL_PATHSPECS_ENVIRONMENT, "0", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--glob-pathspecs")) { + setenv(GIT_GLOB_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--noglob-pathspecs")) { + setenv(GIT_NOGLOB_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--icase-pathspecs")) { + setenv(GIT_ICASE_PATHSPECS_ENVIRONMENT, "1", 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "--shallow-file")) { + (*argv)++; + (*argc)--; + set_alternate_shallow_file((*argv)[0], 1); + if (envchanged) + *envchanged = 1; + } else if (!strcmp(cmd, "-C")) { + if (*argc < 2) { + fprintf(stderr, "No directory given for -C.\n" ); + usage(git_usage_string); + } + if ((*argv)[1][0]) { + if (chdir((*argv)[1])) + die_errno("Cannot change to '%s'", (*argv)[1]); + if (envchanged) + *envchanged = 1; + } + (*argv)++; + (*argc)--; } else { fprintf(stderr, "Unknown option: %s\n", cmd); usage(git_usage_string); @@ -78,99 +219,54 @@ static int handle_options(const char*** argv, int* argc) (*argv)++; (*argc)--; - handled++; } - return handled; -} - -static const char *alias_command; -static char *alias_string; - -static int git_alias_config(const char *var, const char *value) -{ - if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) { - alias_string = xstrdup(value); - } - return 0; -} - -static int split_cmdline(char *cmdline, const char ***argv) -{ - int src, dst, count = 0, size = 16; - char quoted = 0; - - *argv = malloc(sizeof(char*) * size); - - /* split alias_string */ - (*argv)[count++] = cmdline; - for (src = dst = 0; cmdline[src];) { - char c = cmdline[src]; - if (!quoted && isspace(c)) { - cmdline[dst++] = 0; - while (cmdline[++src] - && isspace(cmdline[src])) - ; /* skip */ - if (count >= size) { - size += 16; - *argv = xrealloc(*argv, sizeof(char*) * size); - } - (*argv)[count++] = cmdline + dst; - } else if(!quoted && (c == '\'' || c == '"')) { - quoted = c; - src++; - } else if (c == quoted) { - quoted = 0; - src++; - } else { - if (c == '\\' && quoted != '\'') { - src++; - c = cmdline[src]; - if (!c) { - free(*argv); - *argv = NULL; - return error("cmdline ends with \\"); - } - } - cmdline[dst++] = c; - src++; - } - } - - cmdline[dst] = 0; - - if (quoted) { - free(*argv); - *argv = NULL; - return error("unclosed quote"); - } - - return count; + return (*argv) - orig_argv; } static int handle_alias(int *argcp, const char ***argv) { - int nongit = 0, ret = 0, saved_errno = errno; + int envchanged = 0, ret = 0, saved_errno = errno; const char *subdir; int count, option_count; - const char** new_argv; + const char **new_argv; + const char *alias_command; + char *alias_string; + int unused_nongit; - subdir = setup_git_directory_gently(&nongit); + subdir = setup_git_directory_gently(&unused_nongit); alias_command = (*argv)[0]; - git_config(git_alias_config); + alias_string = alias_lookup(alias_command); if (alias_string) { if (alias_string[0] == '!') { - 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); + const char **alias_argv; + int argc = *argcp, i; + + commit_pager_choice(); + + /* build alias_argv */ + alias_argv = xmalloc(sizeof(*alias_argv) * (argc + 1)); + alias_argv[0] = alias_string + 1; + for (i = 1; i < argc; ++i) + alias_argv[i] = (*argv)[i]; + alias_argv[argc] = NULL; + + ret = run_command_v_opt(alias_argv, RUN_USING_SHELL); + if (ret >= 0) /* normal exit */ + exit(ret); + + die_errno("While expanding alias '%s': '%s'", + alias_command, alias_string + 1); } count = split_cmdline(alias_string, &new_argv); - option_count = handle_options(&new_argv, &count); + if (count < 0) + die("Bad alias.%s string: %s", alias_command, + split_cmdline_strerror(count)); + 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; @@ -181,15 +277,13 @@ static int handle_alias(int *argcp, const char ***argv) if (!strcmp(alias_command, new_argv[0])) die("recursive alias: %s", alias_command); - trace_argv_printf(new_argv, count, + trace_argv_printf(new_argv, "trace: alias expansion: %s =>", alias_command); - new_argv = xrealloc(new_argv, sizeof(char*) * - (count + *argcp + 1)); + REALLOC_ARRAY(new_argv, count + *argcp); /* insert after command name */ - memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp); - new_argv[count+*argcp] = NULL; + memcpy(new_argv + count, *argv + 1, sizeof(char *) * *argcp); *argv = new_argv; *argcp += count - 1; @@ -197,101 +291,235 @@ static int handle_alias(int *argcp, const char ***argv) ret = 1; } - if (subdir) - chdir(subdir); + if (subdir && chdir(subdir)) + die_errno("Cannot change to '%s'", subdir); errno = saved_errno; return ret; } -const char git_version_string[] = GIT_VERSION; - -#define RUN_SETUP (1<<0) -#define USE_PAGER (1<<1) +#define RUN_SETUP (1<<0) +#define RUN_SETUP_GENTLY (1<<1) +#define USE_PAGER (1<<2) /* * require working tree to be present -- anything uses this needs * RUN_SETUP for reading from the configuration file. */ -#define NOT_BARE (1<<2) +#define NEED_WORK_TREE (1<<3) +#define NO_SETUP (1<<4) + +struct cmd_struct { + const char *cmd; + int (*fn)(int, const char **, const char *); + int option; +}; + +static int run_builtin(struct cmd_struct *p, int argc, const char **argv) +{ + int status, help; + struct stat st; + const char *prefix; + + prefix = NULL; + help = argc == 2 && !strcmp(argv[1], "-h"); + if (!help) { + if (p->option & RUN_SETUP) + prefix = setup_git_directory(); + else if (p->option & RUN_SETUP_GENTLY) { + int nongit_ok; + prefix = setup_git_directory_gently(&nongit_ok); + } + + if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) + use_pager = check_pager_config(p->cmd); + if (use_pager == -1 && p->option & USE_PAGER) + use_pager = 1; + + if ((p->option & (RUN_SETUP | RUN_SETUP_GENTLY)) && + startup_info->have_repository) /* get_git_dir() may set up repo, avoid that */ + trace_repo_setup(prefix); + } + commit_pager_choice(); + + if (!help && 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; + + /* 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_errno("write failure on standard output"); + if (ferror(stdout)) + die("unknown write failure on standard output"); + if (fclose(stdout)) + die_errno("close failed on standard output"); + return 0; +} + +static struct cmd_struct commands[] = { + { "add", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + { "am", cmd_am, RUN_SETUP | NEED_WORK_TREE }, + { "annotate", cmd_annotate, RUN_SETUP }, + { "apply", cmd_apply, RUN_SETUP_GENTLY }, + { "archive", cmd_archive }, + { "bisect--helper", cmd_bisect__helper, RUN_SETUP }, + { "blame", cmd_blame, RUN_SETUP }, + { "branch", cmd_branch, RUN_SETUP }, + { "bundle", cmd_bundle, RUN_SETUP_GENTLY }, + { "cat-file", cmd_cat_file, RUN_SETUP }, + { "check-attr", cmd_check_attr, RUN_SETUP }, + { "check-ignore", cmd_check_ignore, RUN_SETUP | NEED_WORK_TREE }, + { "check-mailmap", cmd_check_mailmap, RUN_SETUP }, + { "check-ref-format", cmd_check_ref_format }, + { "checkout", cmd_checkout, RUN_SETUP | NEED_WORK_TREE }, + { "checkout-index", cmd_checkout_index, + RUN_SETUP | NEED_WORK_TREE}, + { "cherry", cmd_cherry, RUN_SETUP }, + { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE }, + { "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE }, + { "clone", cmd_clone, NO_SETUP }, + { "column", cmd_column, RUN_SETUP_GENTLY }, + { "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE }, + { "commit-tree", cmd_commit_tree, RUN_SETUP }, + { "config", cmd_config, RUN_SETUP_GENTLY }, + { "count-objects", cmd_count_objects, RUN_SETUP }, + { "credential", cmd_credential, RUN_SETUP_GENTLY }, + { "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 }, + { "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_GENTLY }, + { "hash-object", cmd_hash_object }, + { "help", cmd_help }, + { "index-pack", cmd_index_pack, RUN_SETUP_GENTLY }, + { "init", cmd_init_db, NO_SETUP }, + { "init-db", cmd_init_db, NO_SETUP }, + { "interpret-trailers", cmd_interpret_trailers, RUN_SETUP }, + { "log", cmd_log, RUN_SETUP }, + { "ls-files", cmd_ls_files, RUN_SETUP }, + { "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY }, + { "ls-tree", cmd_ls_tree, RUN_SETUP }, + { "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, RUN_SETUP_GENTLY }, + { "merge-index", cmd_merge_index, RUN_SETUP }, + { "merge-ours", cmd_merge_ours, RUN_SETUP }, + { "merge-recursive", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "merge-recursive-ours", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "merge-recursive-theirs", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "merge-subtree", cmd_merge_recursive, RUN_SETUP | NEED_WORK_TREE }, + { "merge-tree", cmd_merge_tree, RUN_SETUP }, + { "mktag", cmd_mktag, RUN_SETUP }, + { "mktree", cmd_mktree, RUN_SETUP }, + { "mv", cmd_mv, RUN_SETUP | NEED_WORK_TREE }, + { "name-rev", cmd_name_rev, RUN_SETUP }, + { "notes", cmd_notes, RUN_SETUP }, + { "pack-objects", cmd_pack_objects, RUN_SETUP }, + { "pack-redundant", cmd_pack_redundant, RUN_SETUP }, + { "pack-refs", cmd_pack_refs, RUN_SETUP }, + { "patch-id", cmd_patch_id }, + { "pickaxe", cmd_blame, RUN_SETUP }, + { "prune", cmd_prune, RUN_SETUP }, + { "prune-packed", cmd_prune_packed, RUN_SETUP }, + { "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE }, + { "push", cmd_push, RUN_SETUP }, + { "read-tree", cmd_read_tree, RUN_SETUP }, + { "receive-pack", cmd_receive_pack }, + { "reflog", cmd_reflog, RUN_SETUP }, + { "remote", cmd_remote, RUN_SETUP }, + { "remote-ext", cmd_remote_ext }, + { "remote-fd", cmd_remote_fd }, + { "repack", cmd_repack, RUN_SETUP }, + { "replace", cmd_replace, RUN_SETUP }, + { "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, RUN_SETUP_GENTLY | USE_PAGER }, + { "show", cmd_show, RUN_SETUP }, + { "show-branch", cmd_show_branch, RUN_SETUP }, + { "show-ref", cmd_show_ref, RUN_SETUP }, + { "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE }, + { "status", cmd_status, RUN_SETUP | NEED_WORK_TREE }, + { "stripspace", cmd_stripspace }, + { "symbolic-ref", cmd_symbolic_ref, RUN_SETUP }, + { "tag", cmd_tag, RUN_SETUP }, + { "unpack-file", cmd_unpack_file, RUN_SETUP }, + { "unpack-objects", cmd_unpack_objects, RUN_SETUP }, + { "update-index", cmd_update_index, RUN_SETUP }, + { "update-ref", cmd_update_ref, RUN_SETUP }, + { "update-server-info", cmd_update_server_info, RUN_SETUP }, + { "upload-archive", cmd_upload_archive }, + { "upload-archive--writer", cmd_upload_archive_writer }, + { "var", cmd_var, RUN_SETUP_GENTLY }, + { "verify-commit", cmd_verify_commit, RUN_SETUP }, + { "verify-pack", cmd_verify_pack }, + { "verify-tag", cmd_verify_tag, RUN_SETUP }, + { "version", cmd_version }, + { "whatchanged", cmd_whatchanged, RUN_SETUP }, + { "worktree", cmd_worktree, RUN_SETUP }, + { "write-tree", cmd_write_tree, RUN_SETUP }, +}; + +static struct cmd_struct *get_builtin(const char *s) +{ + int i; + for (i = 0; i < ARRAY_SIZE(commands); i++) { + struct cmd_struct *p = commands + i; + if (!strcmp(s, p->cmd)) + return p; + } + return NULL; +} + +int is_builtin(const char *s) +{ + return !!get_builtin(s); +} -static void handle_internal_command(int argc, const char **argv, char **envp) +static void handle_builtin(int argc, const char **argv) { const char *cmd = argv[0]; - static struct cmd_struct { - const char *cmd; - int (*fn)(int, const char **, const char *); - int option; - } commands[] = { - { "add", cmd_add, RUN_SETUP | NOT_BARE }, - { "annotate", cmd_annotate, USE_PAGER }, - { "apply", cmd_apply }, - { "archive", cmd_archive, RUN_SETUP }, - { "blame", cmd_blame, RUN_SETUP }, - { "branch", cmd_branch, RUN_SETUP }, - { "bundle", cmd_bundle }, - { "cat-file", cmd_cat_file, RUN_SETUP }, - { "checkout-index", cmd_checkout_index, RUN_SETUP }, - { "check-ref-format", cmd_check_ref_format }, - { "cherry", cmd_cherry, RUN_SETUP }, - { "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, USE_PAGER }, - { "diff-files", cmd_diff_files }, - { "diff-index", cmd_diff_index, RUN_SETUP }, - { "diff-tree", cmd_diff_tree, 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 }, - { "get-tar-commit-id", cmd_get_tar_commit_id }, - { "grep", cmd_grep, RUN_SETUP | USE_PAGER }, - { "help", cmd_help }, - { "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 }, - { "mailinfo", cmd_mailinfo }, - { "mailsplit", cmd_mailsplit }, - { "merge-base", cmd_merge_base, RUN_SETUP }, - { "merge-file", cmd_merge_file }, - { "mv", cmd_mv, RUN_SETUP | NOT_BARE }, - { "name-rev", cmd_name_rev, RUN_SETUP }, - { "pack-objects", cmd_pack_objects, RUN_SETUP }, - { "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER }, - { "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 }, - { "repo-config", cmd_config }, - { "rerere", cmd_rerere, RUN_SETUP }, - { "rev-list", cmd_rev_list, RUN_SETUP }, - { "rev-parse", cmd_rev_parse, RUN_SETUP }, - { "rm", cmd_rm, RUN_SETUP | NOT_BARE }, - { "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE }, - { "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER }, - { "show-branch", cmd_show_branch, RUN_SETUP }, - { "show", cmd_show, RUN_SETUP | USE_PAGER }, - { "stripspace", cmd_stripspace }, - { "symbolic-ref", cmd_symbolic_ref, 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 }, - { "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; + struct cmd_struct *builtin; + + 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")) { @@ -299,46 +527,123 @@ static void handle_internal_command(int argc, const char **argv, char **envp) argv[0] = cmd = "help"; } - for (i = 0; i < ARRAY_SIZE(commands); i++) { - struct cmd_struct *p = commands+i; - const char *prefix; - if (strcmp(p->cmd, cmd)) - continue; - - prefix = NULL; - if (p->option & RUN_SETUP) - prefix = setup_git_directory(); - if (p->option & USE_PAGER) - setup_pager(); - if ((p->option & NOT_BARE) && - (is_bare_repository() || is_inside_git_dir())) - die("%s must be run in a work tree", cmd); - trace_argv_printf(argv, argc, "trace: built-in: git"); - - exit(p->fn(argc, argv, prefix)); + builtin = get_builtin(cmd); + if (builtin) { + if (saved_environment && (builtin->option & NO_SETUP)) + restore_env(); + else + exit(run_builtin(builtin, argc, argv)); } } -int main(int argc, const char **argv, char **envp) +static void execv_dashed_external(const char **argv) { - const char *cmd = argv[0] ? argv[0] : "git-help"; - char *slash = strrchr(cmd, '/'); - const char *exec_path = NULL; - int done_alias = 0; + struct strbuf cmd = STRBUF_INIT; + const char *tmp; + int status; + + if (use_pager == -1) + use_pager = check_pager_config(argv[0]); + commit_pager_choice(); + + 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:"); /* - * Take the basename of argv[0] as the command - * name, and the dirname as the default exec_path - * if it's an absolute path and we don't have - * anything better. + * if we fail because the command is not found, it is + * OK to return. Otherwise, we just pass along the status code. */ - if (slash) { - *slash++ = 0; - if (*cmd == '/') - exec_path = cmd; - cmd = slash; + status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT); + if (status >= 0 || errno != ENOENT) + exit(status); + + argv[0] = tmp; + + strbuf_release(&cmd); +} + +static int run_argv(int *argcp, const char ***argv) +{ + int done_alias = 0; + + while (1) { + /* See if it's a builtin */ + handle_builtin(*argcp, *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) + break; + save_env(); + if (!handle_alias(argcp, argv)) + break; + done_alias = 1; } + return done_alias; +} + +/* + * Many parts of Git have subprograms communicate via pipe, expect the + * upstream of a pipe to die with SIGPIPE when the downstream of a + * pipe does not need to read all that is written. Some third-party + * programs that ignore or block SIGPIPE for their own reason forget + * to restore SIGPIPE handling to the default before spawning Git and + * break this carefully orchestrated machinery. + * + * Restore the way SIGPIPE is handled to default, which is what we + * expect. + */ +static void restore_sigpipe_to_default(void) +{ + sigset_t unblock; + + sigemptyset(&unblock); + sigaddset(&unblock, SIGPIPE); + sigprocmask(SIG_UNBLOCK, &unblock, NULL); + signal(SIGPIPE, SIG_DFL); +} + +int main(int argc, char **av) +{ + const char **argv = (const char **) av; + const char *cmd; + int done_help = 0; + + startup_info = &git_startup_info; + + cmd = git_extract_argv0_path(argv[0]); + if (!cmd) + cmd = "git-help"; + + /* + * Always open file descriptors 0/1/2 to avoid clobbering files + * in die(). It also avoids messing up when the pipes are dup'ed + * onto stdin/stdout/stderr in the child processes we spawn. + */ + sanitize_stdfds(); + + restore_sigpipe_to_default(); + + git_setup_gettext(); + + trace_command_performance(argv); + /* * "git-xxxx" is the same as "git xxxx", but we obviously: * @@ -346,66 +651,55 @@ int main(int argc, const char **argv, char **envp) * - 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. + * So we just directly call the builtin handler, and die if + * that one cannot handle it. */ - if (!prefixcmp(cmd, "git-")) { - cmd += 4; + if (skip_prefix(cmd, "git-", &cmd)) { argv[0] = cmd; - handle_internal_command(argc, argv, envp); - die("cannot handle %s internally", cmd); + handle_builtin(argc, argv); + die("cannot handle %s as a builtin", cmd); } /* Look for flags.. */ argv++; argc--; - handle_options(&argv, &argc); + handle_options(&argv, &argc, NULL); if (argc > 0) { - if (!prefixcmp(argv[0], "--")) - argv[0] += 2; + /* translate --help and --version into commands */ + skip_prefix(argv[0], "--", &argv[0]); } else { - /* Default command: "help" */ - argv[0] = "help"; - argc = 1; + /* The user didn't specify a command; give them help */ + commit_pager_choice(); + 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 search for git commands in the following order: - * - git_exec_path() - * - the path of the "git" command if we could find it - * in $0 - * - the regular PATH. + * We use PATH to find git commands, but we prepend some higher + * precedence paths: the "--exec-path" option, the GIT_EXEC_PATH + * environment, and the $(gitexecdir) from the Makefile at build + * time. */ - if (exec_path) - prepend_to_path(exec_path, strlen(exec_path)); - exec_path = git_exec_path(); - prepend_to_path(exec_path, strlen(exec_path)); + setup_path(); while (1) { - /* See if it's an internal command */ - handle_internal_command(argc, argv, envp); - - /* .. then try the external ones */ - execv_git_cmd(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)) + int was_alias = run_argv(&argc, &argv); + if (errno != ENOENT) break; - done_alias = 1; - } - - if (errno == ENOENT) { - if (done_alias) { + if (was_alias) { fprintf(stderr, "Expansion of alias '%s' failed; " - "'%s' is not a git-command\n", + "'%s' is not a git command\n", cmd, argv[0]); exit(1); } - help_unknown_cmd(cmd); + if (!done_help) { + cmd = argv[0] = help_unknown_cmd(cmd); + done_help = 1; + } else + break; } fprintf(stderr, "Failed to run command '%s': %s\n", |