diff options
Diffstat (limited to 'git.c')
| -rw-r--r-- | git.c | 420 |
1 files changed, 420 insertions, 0 deletions
@@ -0,0 +1,420 @@ +#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] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]"; + +static void prepend_to_path(const char *dir, int len) +{ + 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); + + setenv("PATH", path, 1); + + free(path); +} + +static int handle_options(const char*** argv, int* argc) +{ + 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_exec_path(cmd + 1); + else { + puts(git_exec_path()); + exit(0); + } + } else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) { + setup_pager(); + } 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); + (*argv)++; + (*argc)--; + handled++; + } else if (!prefixcmp(cmd, "--git-dir=")) { + setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1); + } else if (!strcmp(cmd, "--bare")) { + static char git_dir[PATH_MAX+1]; + setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1); + } else { + fprintf(stderr, "Unknown option: %s\n", cmd); + usage(git_usage_string); + } + + (*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 = xmalloc(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; +} + +static int handle_alias(int *argcp, const char ***argv) +{ + int nongit = 0, ret = 0, saved_errno = errno; + const char *subdir; + int count, option_count; + const char** new_argv; + + subdir = setup_git_directory_gently(&nongit); + + alias_command = (*argv)[0]; + git_config(git_alias_config); + 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); + } + count = split_cmdline(alias_string, &new_argv); + option_count = handle_options(&new_argv, &count); + 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, count, + "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 NOT_BARE (1<<2) + +static void handle_internal_command(int argc, const char **argv, char **envp) +{ + 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 }, + { "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 }, + { "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE }, + { "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 }, + { "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 }, + { "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 }, + { "revert", cmd_revert, RUN_SETUP | NOT_BARE }, + { "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; + + /* 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; + 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)); + } +} + +int main(int argc, const char **argv, char **envp) +{ + const char *cmd = argv[0] ? argv[0] : "git-help"; + char *slash = strrchr(cmd, '/'); + const char *exec_path = NULL; + int done_alias = 0; + + /* + * 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 (slash) { + *slash++ = 0; + if (*cmd == '/') + exec_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, envp); + die("cannot handle %s internally", cmd); + } + + /* Look for flags.. */ + argv++; + argc--; + handle_options(&argv, &argc); + if (argc > 0) { + if (!prefixcmp(argv[0], "--")) + argv[0] += 2; + } else { + /* Default command: "help" */ + argv[0] = "help"; + argc = 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. + */ + if (exec_path) + prepend_to_path(exec_path, strlen(exec_path)); + exec_path = git_exec_path(); + prepend_to_path(exec_path, strlen(exec_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)) + 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); + } + help_unknown_cmd(cmd); + } + + fprintf(stderr, "Failed to run command '%s': %s\n", + cmd, strerror(errno)); + + return 1; +} |