#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
-#include <glob.h>
+#include "git-compat-util.h"
+#include "exec_cmd.h"
+#include "cache.h"
-#ifndef PATH_MAX
-# define PATH_MAX 4096
-#endif
+#include "builtin.h"
-static const char git_usage[] =
- "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
+static void prepend_to_path(const char *dir, int len)
+{
+ char *path, *old_path = getenv("PATH");
+ int path_len = len;
-struct string_list {
- size_t len;
- char *str;
- struct string_list *next;
-};
+ if (!old_path)
+ old_path = "/usr/local/bin:/usr/bin:/bin";
-/* 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;
+ path_len = len + strlen(old_path) + 1;
+
+ path = malloc(path_len + 1);
- if (col_string && (n_cols = atoi(col_string)) > 0)
- return n_cols;
+ memcpy(path, dir, len);
+ path[len] = ':';
+ memcpy(path + len + 1, old_path, path_len - len);
- return 80;
+ setenv("PATH", path, 1);
}
-static inline void mput_char(char c, unsigned int num)
+static const char *alias_command;
+static char *alias_string = NULL;
+
+static int git_alias_config(const char *var, const char *value)
{
- while(num--)
- putchar(c);
+ if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
+ alias_string = strdup(value);
+ }
+ return 0;
}
-static void pretty_print_string_list(struct string_list *list, int longest)
+static int split_cmdline(char *cmdline, const char ***argv)
{
- int cols = 1;
- int space = longest + 1; /* min 1 SP between words */
- int max_cols = term_columns() - 1; /* don't print *on* the edge */
-
- if (space < max_cols)
- cols = max_cols / space;
-
- while (list) {
- int c;
- printf(" ");
+ 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 = realloc(*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++;
+ }
+ }
- for (c = cols; c && list; list = list->next) {
- printf("%s", list->str);
+ cmdline[dst] = 0;
- if (--c)
- mput_char(' ', space - list->len);
- }
- putchar('\n');
+ if (quoted) {
+ free(*argv);
+ *argv = NULL;
+ return error("unclosed quote");
}
+
+ return count;
}
-static void list_commands(const char *exec_path, const char *pattern)
+static int handle_alias(int *argcp, const char ***argv)
{
- struct string_list *list = NULL, *tail = NULL;
- unsigned int longest = 0, i;
- glob_t gl;
+ int nongit = 0, ret = 0;
+ const char *subdir;
- if (chdir(exec_path) < 0) {
- printf("git: '%s': %s\n", exec_path, strerror(errno));
- exit(1);
- }
+ subdir = setup_git_directory_gently(&nongit);
+ if (!nongit) {
+ int count;
+ const char** new_argv;
- i = glob(pattern, 0, NULL, &gl);
- switch(i) {
- case GLOB_NOSPACE:
- puts("Out of memory when running glob()");
- exit(2);
- case GLOB_ABORTED:
- printf("'%s': Read error: %s\n", exec_path, strerror(errno));
- exit(2);
- case GLOB_NOMATCH:
- printf("No git commands available in '%s'.\n", exec_path);
- printf("Do you need to specify --exec-path or set GIT_EXEC_PATH?\n");
- exit(1);
- }
+ alias_command = (*argv)[0];
+ git_config(git_alias_config);
+ if (alias_string) {
- for (i = 0; i < gl.gl_pathc; i++) {
- int len = strlen(gl.gl_pathv[i] + 4);
+ count = split_cmdline(alias_string, &new_argv);
- if (access(gl.gl_pathv[i], X_OK))
- continue;
+ if (count < 1)
+ die("empty alias for %s", alias_command);
- if (longest < len)
- longest = len;
+ if (!strcmp(alias_command, new_argv[0]))
+ die("recursive alias: %s", alias_command);
- if (!tail)
- tail = list = malloc(sizeof(struct string_list));
- else {
- tail->next = malloc(sizeof(struct string_list));
- tail = tail->next;
- }
- tail->len = len;
- tail->str = gl.gl_pathv[i] + 4;
- tail->next = NULL;
- }
+ /* insert after command name */
+ if (*argcp > 1) {
+ new_argv = realloc(new_argv, sizeof(char*) *
+ (count + *argcp - 1));
+ memcpy(new_argv + count, *argv, sizeof(char*) *
+ (*argcp - 1));
+ }
- printf("git commands available in '%s'\n", exec_path);
- printf("----------------------------");
- mput_char('-', strlen(exec_path));
- putchar('\n');
- pretty_print_string_list(list, longest);
- putchar('\n');
-}
+ *argv = new_argv;
+ *argcp += count - 1;
-#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');
+ ret = 1;
+ }
}
- else
- puts(git_usage);
- putchar('\n');
+ if (subdir)
+ chdir(subdir);
- if(exec_path)
- list_commands(exec_path, "git-*");
-
- exit(1);
+ return ret;
}
-static void prepend_to_path(const char *dir, int len)
-{
- char *path, *old_path = getenv("PATH");
- int path_len = len;
-
- if (!old_path)
- old_path = "/bin:/usr/bin:.";
-
- path_len = len + strlen(old_path) + 1;
-
- path = malloc(path_len + 1);
- path[path_len + 1] = '\0';
+const char git_version_string[] = GIT_VERSION;
- memcpy(path, dir, len);
- path[len] = ':';
- memcpy(path + len + 1, old_path, path_len - len);
+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 },
+ { "push", cmd_push },
+ { "format-patch", cmd_format_patch },
+ { "count-objects", cmd_count_objects },
+ { "diff", cmd_diff },
+ { "grep", cmd_grep },
+ { "rm", cmd_rm },
+ { "add", cmd_add },
+ { "rev-list", cmd_rev_list },
+ { "init-db", cmd_init_db },
+ { "tar-tree", cmd_tar_tree },
+ { "upload-tar", cmd_upload_tar },
+ { "check-ref-format", cmd_check_ref_format },
+ { "ls-files", cmd_ls_files },
+ { "ls-tree", cmd_ls_tree },
+ { "tar-tree", cmd_tar_tree },
+ { "read-tree", cmd_read_tree },
+ { "commit-tree", cmd_commit_tree },
+ { "apply", cmd_apply },
+ { "show-branch", cmd_show_branch },
+ { "diff-files", cmd_diff_files },
+ { "diff-index", cmd_diff_index },
+ { "diff-stages", cmd_diff_stages },
+ { "diff-tree", cmd_diff_tree },
+ { "cat-file", cmd_cat_file },
+ { "rev-parse", cmd_rev_parse }
+ };
+ 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";
+ }
- setenv("PATH", path, 1);
+ 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;
+ 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;
+ }
- 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)
- usage(exec_path, NULL);
-
- /* allow relative paths, but run with exact */
- if (chdir(exec_path)) {
- printf("git: '%s': %s\n", exec_path, strerror(errno));
- exit (1);
+ 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));
+
+ 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;
}
- getcwd(git_command, sizeof(git_command));
- chdir(wd);
-
- 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]);
+ if (errno == ENOENT)
+ cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
- /* 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));
+ fprintf(stderr, "Failed to run command '%s': %s\n",
+ git_command, strerror(errno));
return 1;
}
projects / git.git / blobdiff