diff options
| -rw-r--r-- | git.c | 153 |
1 files changed, 116 insertions, 37 deletions
@@ -230,62 +230,141 @@ static void show_man_page(char *git_cmd) execlp("man", "man", page, NULL); } +static int cmd_version(int argc, char **argv, char **envp) +{ + printf("git version %s\n", GIT_VERSION); + return 0; +} + +static int cmd_help(int argc, char **argv, char **envp) +{ + char *help_cmd = argv[1]; + if (!help_cmd) + cmd_usage(git_exec_path(), NULL); + show_man_page(help_cmd); + return 0; +} + +#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) + +static void handle_internal_command(int argc, char **argv, char **envp) +{ + const char *cmd = argv[0]; + static struct cmd_struct { + const char *cmd; + int (*fn)(int, char **, char **); + } commands[] = { + { "version", cmd_version }, + { "help", cmd_help }, + }; + int i; + + for (i = 0; i < ARRAY_SIZE(commands); i++) { + struct cmd_struct *p = commands+i; + if (strcmp(p->cmd, cmd)) + continue; + exit(p->fn(argc, argv, envp)); + } +} + int main(int argc, char **argv, char **envp) { + char *cmd = argv[0]; + char *slash = strrchr(cmd, '/'); char git_command[PATH_MAX + 1]; - char wd[PATH_MAX + 1]; - int i, show_help = 0; - const char *exec_path; + const char *exec_path = NULL; + + /* + * 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; + } - getcwd(wd, PATH_MAX); + /* + * "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 (!strncmp(cmd, "git-", 4)) { + cmd += 4; + argv[0] = cmd; + handle_internal_command(argc, argv, envp); + die("cannot handle %s internally", cmd); + } - for (i = 1; i < argc; i++) { - char *arg = argv[i]; + /* Default command: "help" */ + cmd = "help"; - if (!strcmp(arg, "help")) { - show_help = 1; - continue; - } + /* Look for flags.. */ + while (argc > 1) { + cmd = *++argv; + argc--; - if (strncmp(arg, "--", 2)) + if (strncmp(cmd, "--", 2)) break; - arg += 2; + cmd += 2; + + /* + * For legacy reasons, the "version" and "help" + * commands can be written with "--" prepended + * to make them look like flags. + */ + if (!strcmp(cmd, "help")) + break; + if (!strcmp(cmd, "version")) + break; - if (!strncmp(arg, "exec-path", 9)) { - arg += 9; - if (*arg == '=') { - exec_path = arg + 1; - git_set_exec_path(exec_path); - } else { - puts(git_exec_path()); - exit(0); + /* + * Check remaining flags (which by now must be + * "--exec-path", but maybe we will accept + * other arguments some day) + */ + if (!strncmp(cmd, "exec-path", 9)) { + cmd += 9; + if (*cmd == '=') { + git_set_exec_path(cmd + 1); + continue; } - } - else if (!strcmp(arg, "version")) { - printf("git version %s\n", GIT_VERSION); + puts(git_exec_path()); exit(0); } - else if (!strcmp(arg, "help")) - show_help = 1; - else if (!show_help) - cmd_usage(NULL, NULL); - } - - if (i >= argc || show_help) { - if (i >= argc) - cmd_usage(git_exec_path(), NULL); - - show_man_page(argv[i]); + cmd_usage(NULL, NULL); } - + argv[0] = cmd; + + /* + * 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)); - execv_git_cmd(argv + i); + /* See if it's an internal command */ + handle_internal_command(argc, argv, envp); + + /* .. then try the external ones */ + execv_git_cmd(argv); if (errno == ENOENT) - cmd_usage(exec_path, "'%s' is not a git-command", argv[i]); + cmd_usage(exec_path, "'%s' is not a git-command", cmd); fprintf(stderr, "Failed to run command '%s': %s\n", git_command, strerror(errno)); |