X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=git.c;h=b0da6b19457cf06f8e880bd0b18f270da94069b1;hb=1025fe51bf540bc4c63bce2553a43b1c753e1c40;hp=5e7da74b6800a4256f9bcb0d0add7560213271e1;hpb=92e802c6ccb96d1b5e8561b0a136d43d82253293;p=git.git diff --git a/git.c b/git.c index 5e7da74b..b0da6b19 100644 --- a/git.c +++ b/git.c @@ -10,6 +10,11 @@ #include #include #include "git-compat-util.h" +#include "exec_cmd.h" + +#include "cache.h" +#include "commit.h" +#include "revision.h" #ifndef PATH_MAX # define PATH_MAX 4096 @@ -229,91 +234,161 @@ static void show_man_page(char *git_cmd) execlp("man", "man", page, NULL); } -int main(int argc, char **argv, char **envp) +static int cmd_version(int argc, char **argv, char **envp) { - char git_command[PATH_MAX + 1]; - char wd[PATH_MAX + 1]; - int i, len, show_help = 0; - char *exec_path = getenv("GIT_EXEC_PATH"); + printf("git version %s\n", GIT_VERSION); + return 0; +} - getcwd(wd, PATH_MAX); +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; +} - if (!exec_path) - exec_path = GIT_EXEC_PATH; +#define LOGSIZE (65536) - for (i = 1; i < argc; i++) { - char *arg = argv[i]; +static int cmd_log(int argc, char **argv, char **envp) +{ + struct rev_info rev; + struct commit *commit; + char *buf = xmalloc(LOGSIZE); + + argc = setup_revisions(argc, argv, &rev, "HEAD"); + prepare_revision_walk(&rev); + setup_pager(); + while ((commit = get_revision(&rev)) != NULL) { + pretty_print_commit(CMIT_FMT_DEFAULT, commit, ~0, buf, LOGSIZE, 18); + printf("%s\n", buf); + } + free(buf); + return 0; +} - if (!strcmp(arg, "help")) { - show_help = 1; - continue; - } +#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0])) - if (strncmp(arg, "--", 2)) - break; +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 }, + { "log", cmd_log }, + }; + 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)); + } +} - arg += 2; +int main(int argc, char **argv, char **envp) +{ + char *cmd = argv[0]; + char *slash = strrchr(cmd, '/'); + char git_command[PATH_MAX + 1]; + 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; + } - if (!strncmp(arg, "exec-path", 9)) { - arg += 9; - if (*arg == '=') - exec_path = arg + 1; - else { - puts(exec_path); - exit(0); - } - } - else if (!strcmp(arg, "version")) { - printf("git version %s\n", GIT_VERSION); - exit(0); - } - else if (!strcmp(arg, "help")) - show_help = 1; - else if (!show_help) - cmd_usage(NULL, NULL); + /* + * "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); } - if (i >= argc || show_help) { - if (i >= argc) - cmd_usage(exec_path, NULL); + /* Default command: "help" */ + cmd = "help"; - show_man_page(argv[i]); - } + /* Look for flags.. */ + while (argc > 1) { + cmd = *++argv; + argc--; - if (*exec_path != '/') { - if (!getcwd(git_command, sizeof(git_command))) { - fprintf(stderr, - "git: cannot determine current directory\n"); - exit(1); - } - len = strlen(git_command); + if (strncmp(cmd, "--", 2)) + break; + + cmd += 2; - /* Trivial cleanup */ - while (!strncmp(exec_path, "./", 2)) { - exec_path += 2; - while (*exec_path == '/') - exec_path++; + /* + * 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; + + /* + * 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; + } + puts(git_exec_path()); + exit(0); } - snprintf(git_command + len, sizeof(git_command) - len, - "/%s", exec_path); + cmd_usage(NULL, NULL); } - else - strcpy(git_command, exec_path); - len = strlen(git_command); - prepend_to_path(git_command, len); - - len += snprintf(git_command + len, sizeof(git_command) - len, - "/git-%s", argv[i]); - if (sizeof(git_command) <= len) { - fprintf(stderr, "git: command name given is too long.\n"); - exit(1); - } - - /* execve() can only ever return if it fails */ - execve(git_command, &argv[i], envp); + 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)); + + /* 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));