#include <errno.h>
#include <limits.h>
#include <stdarg.h>
+#include "git-compat-util.h"
+#include "exec_cmd.h"
-#ifndef PATH_MAX
-# define PATH_MAX 4096
-#endif
-
-static const char git_usage[] =
- "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
-
-/* most gui terms set COLUMNS (although some don't export it) */
-static int term_columns(void)
-{
- char *col_string = getenv("COLUMNS");
- int n_cols = 0;
-
- if (col_string && (n_cols = atoi(col_string)) > 0)
- return n_cols;
-
- return 80;
-}
-
-static void oom(void)
-{
- fprintf(stderr, "git: out of memory\n");
- exit(1);
-}
-
-static inline void mput_char(char c, unsigned int num)
-{
- while(num--)
- putchar(c);
-}
-
-static struct cmdname {
- size_t len;
- char name[1];
-} **cmdname;
-static int cmdname_alloc, cmdname_cnt;
-
-static void add_cmdname(const char *name, int len)
-{
- struct cmdname *ent;
- if (cmdname_alloc <= cmdname_cnt) {
- cmdname_alloc = cmdname_alloc + 200;
- cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
- if (!cmdname)
- oom();
- }
- ent = malloc(sizeof(*ent) + len);
- if (!ent)
- oom();
- ent->len = len;
- memcpy(ent->name, name, len);
- ent->name[len] = 0;
- cmdname[cmdname_cnt++] = ent;
-}
-
-static int cmdname_compare(const void *a_, const void *b_)
-{
- struct cmdname *a = *(struct cmdname **)a_;
- struct cmdname *b = *(struct cmdname **)b_;
- return strcmp(a->name, b->name);
-}
-
-static void pretty_print_string_list(struct cmdname **cmdname, int longest)
-{
- int cols = 1;
- int space = longest + 1; /* min 1 SP between words */
- int max_cols = term_columns() - 1; /* don't print *on* the edge */
- int i;
-
- if (space < max_cols)
- cols = max_cols / space;
-
- qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
-
- for (i = 0; i < cmdname_cnt; ) {
- int c;
- printf(" ");
-
- for (c = cols; c && i < cmdname_cnt; i++) {
- printf("%s", cmdname[i]->name);
-
- if (--c)
- mput_char(' ', space - cmdname[i]->len);
- }
- putchar('\n');
- }
-}
-
-static void list_commands(const char *exec_path, const char *pattern)
-{
- unsigned int longest = 0;
- char path[PATH_MAX];
- int dirlen;
- DIR *dir = opendir(exec_path);
- struct dirent *de;
-
- if (!dir) {
- fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
- exit(1);
- }
-
- dirlen = strlen(exec_path);
- if (PATH_MAX - 20 < dirlen) {
- fprintf(stderr, "git: insanely long exec-path '%s'\n",
- exec_path);
- exit(1);
- }
-
- memcpy(path, exec_path, dirlen);
- path[dirlen++] = '/';
-
- while ((de = readdir(dir)) != NULL) {
- struct stat st;
- int entlen;
-
- if (strncmp(de->d_name, "git-", 4))
- continue;
- strcpy(path+dirlen, de->d_name);
- if (stat(path, &st) || /* stat, not lstat */
- !S_ISREG(st.st_mode) ||
- !(st.st_mode & S_IXUSR))
- continue;
-
- entlen = strlen(de->d_name);
- if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
- entlen -= 4;
-
- if (longest < entlen)
- longest = entlen;
-
- add_cmdname(de->d_name + 4, entlen-4);
- }
- closedir(dir);
-
- printf("git commands available in '%s'\n", exec_path);
- printf("----------------------------");
- mput_char('-', strlen(exec_path));
- putchar('\n');
- pretty_print_string_list(cmdname, longest - 4);
- putchar('\n');
-}
-
-#ifdef __GNUC__
-static void usage(const char *exec_path, const char *fmt, ...)
- __attribute__((__format__(__printf__, 2, 3), __noreturn__));
-#endif
-static void usage(const char *exec_path, const char *fmt, ...)
-{
- if (fmt) {
- va_list ap;
-
- va_start(ap, fmt);
- printf("git: ");
- vprintf(fmt, ap);
- va_end(ap);
- putchar('\n');
- }
- else
- puts(git_usage);
-
- putchar('\n');
-
- if(exec_path)
- list_commands(exec_path, "git-*");
-
- exit(1);
-}
+#include "builtin.h"
static void prepend_to_path(const char *dir, int len)
{
path_len = len + strlen(old_path) + 1;
path = malloc(path_len + 1);
- path[path_len + 1] = '\0';
memcpy(path, dir, len);
path[len] = ':';
setenv("PATH", path, 1);
}
-static void show_man_page(char *git_cmd)
-{
- char *page;
+const char git_version_string[] = GIT_VERSION;
- if (!strncmp(git_cmd, "git", 3))
- page = git_cmd;
- else {
- int page_len = strlen(git_cmd) + 4;
+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 **, char **);
+ } commands[] = {
+ { "version", cmd_version },
+ { "help", cmd_help },
+ { "log", cmd_log },
+ { "whatchanged", cmd_whatchanged },
+ { "show", cmd_show },
+ };
+ int i;
- page = malloc(page_len + 1);
- strcpy(page, "git-");
- strcpy(page + 4, git_cmd);
- page[page_len] = 0;
+ /* Turn "git cmd --help" into "git help cmd" */
+ if (argc > 1 && !strcmp(argv[1], "--help")) {
+ argv[1] = argv[0];
+ argv[0] = cmd = "help";
}
- execlp("man", "man", page, NULL);
+ 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)
+int main(int argc, const char **argv, char **envp)
{
+ const char *cmd = argv[0];
+ char *slash = strrchr(cmd, '/');
char git_command[PATH_MAX + 1];
- char wd[PATH_MAX + 1];
- int i, len, show_help = 0;
- char *exec_path = getenv("GIT_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);
+ }
- if (!exec_path)
- exec_path = GIT_EXEC_PATH;
+ /* Default command: "help" */
+ cmd = "help";
- for (i = 1; i < argc; i++) {
- char *arg = argv[i];
+ /* 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;
- else {
- puts(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)
- usage(NULL, NULL);
+ cmd_usage(0, NULL, NULL);
}
-
- if (i >= argc || show_help) {
- if (i >= argc)
- usage(exec_path, NULL);
-
- show_man_page(argv[i]);
- }
-
- if (*exec_path != '/') {
- if (!getcwd(git_command, sizeof(git_command))) {
- fprintf(stderr,
- "git: cannot determine current directory");
- exit(1);
- }
- len = strlen(git_command);
-
- /* Trivial cleanup */
- while (!strncmp(exec_path, "./", 2)) {
- exec_path += 2;
- while (*exec_path == '/')
- *exec_path++;
- }
- snprintf(git_command + len, sizeof(git_command) - len,
- "/%s", exec_path);
- }
- else
- strcpy(git_command, exec_path);
- len = strlen(git_command);
- prepend_to_path(git_command, len);
-
- strncat(&git_command[len], "/git-", sizeof(git_command) - len);
- len += 5;
- strncat(&git_command[len], argv[i], sizeof(git_command) - len);
-
- if (access(git_command, X_OK))
- usage(exec_path, "'%s' is not a git-command", argv[i]);
-
- /* execve() can only ever return if it fails */
- execve(git_command, &argv[i], envp);
- printf("Failed to run command '%s': %s\n", git_command, strerror(errno));
+ 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(0, exec_path, "'%s' is not a git-command", cmd);
+
+ fprintf(stderr, "Failed to run command '%s': %s\n",
+ git_command, strerror(errno));
return 1;
}
projects / git.git / blobdiff