"concept guides. See 'git help <command>' or 'git help <concept>'\n"
"to read about a specific subcommand or concept.");
-static struct startup_info git_startup_info;
static int use_pager = -1;
static char *orig_cwd;
static const char *env_names[] = {
GIT_PREFIX_ENVIRONMENT
};
static char *orig_env[4];
-static int saved_environment;
+static int save_restore_env_balance;
-static void save_env(void)
+static void save_env_before_alias(void)
{
int i;
- if (saved_environment)
- return;
- saved_environment = 1;
+
+ assert(save_restore_env_balance == 0);
+ save_restore_env_balance = 1;
orig_cwd = xgetcwd();
for (i = 0; i < ARRAY_SIZE(env_names); i++) {
orig_env[i] = getenv(env_names[i]);
- if (orig_env[i])
- orig_env[i] = xstrdup(orig_env[i]);
+ orig_env[i] = xstrdup_or_null(orig_env[i]);
}
}
-static void restore_env(void)
+static void restore_env(int external_alias)
{
int i;
- if (orig_cwd && chdir(orig_cwd))
+
+ assert(save_restore_env_balance == 1);
+ save_restore_env_balance = 0;
+ if (!external_alias && orig_cwd && chdir(orig_cwd))
die_errno("could not move to %s", orig_cwd);
free(orig_cwd);
for (i = 0; i < ARRAY_SIZE(env_names); i++) {
- if (orig_env[i])
+ if (external_alias &&
+ !strcmp(env_names[i], GIT_PREFIX_ENVIRONMENT))
+ continue;
+ if (orig_env[i]) {
setenv(env_names[i], orig_env[i], 1);
- else
+ free(orig_env[i]);
+ } else {
unsetenv(env_names[i]);
+ }
}
}
setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
if (envchanged)
*envchanged = 1;
+ } else if (!strcmp(cmd, "--super-prefix")) {
+ if (*argc < 2) {
+ fprintf(stderr, "No prefix given for --super-prefix.\n" );
+ usage(git_usage_string);
+ }
+ setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
+ if (envchanged)
+ *envchanged = 1;
+ (*argv)++;
+ (*argc)--;
+ } else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
+ setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
+ if (envchanged)
+ *envchanged = 1;
} else if (!strcmp(cmd, "--bare")) {
char *cwd = xgetcwd();
is_bare_repository_cfg = 1;
static int handle_alias(int *argcp, const char ***argv)
{
int envchanged = 0, ret = 0, saved_errno = errno;
- const char *subdir;
int count, option_count;
const char **new_argv;
const char *alias_command;
char *alias_string;
int unused_nongit;
- subdir = setup_git_directory_gently(&unused_nongit);
+ save_env_before_alias();
+ setup_git_directory_gently(&unused_nongit);
alias_command = (*argv)[0];
alias_string = alias_lookup(alias_command);
struct child_process child = CHILD_PROCESS_INIT;
commit_pager_choice();
+ restore_env(1);
child.use_shell = 1;
argv_array_push(&child.args, alias_string + 1);
ret = 1;
}
- if (subdir && chdir(subdir))
- die_errno("Cannot change to '%s'", subdir);
+ restore_env(0);
errno = saved_errno;
* RUN_SETUP for reading from the configuration file.
*/
#define NEED_WORK_TREE (1<<3)
-#define NO_SETUP (1<<4)
+#define SUPPORT_SUPER_PREFIX (1<<4)
struct cmd_struct {
const char *cmd;
}
commit_pager_choice();
+ if (!help && get_super_prefix()) {
+ if (!(p->option & SUPPORT_SUPER_PREFIX))
+ die("%s doesn't support --super-prefix", p->cmd);
+ }
+
if (!help && p->option & NEED_WORK_TREE)
setup_work_tree();
{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
{ "annotate", cmd_annotate, RUN_SETUP },
{ "apply", cmd_apply, RUN_SETUP_GENTLY },
- { "archive", cmd_archive },
+ { "archive", cmd_archive, RUN_SETUP_GENTLY },
{ "bisect--helper", cmd_bisect__helper, RUN_SETUP },
{ "blame", cmd_blame, RUN_SETUP },
{ "branch", cmd_branch, RUN_SETUP },
{ "cherry", cmd_cherry, RUN_SETUP },
{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NEED_WORK_TREE },
{ "clean", cmd_clean, RUN_SETUP | NEED_WORK_TREE },
- { "clone", cmd_clone, NO_SETUP },
+ { "clone", cmd_clone },
{ "column", cmd_column, RUN_SETUP_GENTLY },
{ "commit", cmd_commit, RUN_SETUP | NEED_WORK_TREE },
{ "commit-tree", cmd_commit_tree, RUN_SETUP },
{ "diff-files", cmd_diff_files, RUN_SETUP | NEED_WORK_TREE },
{ "diff-index", cmd_diff_index, RUN_SETUP },
{ "diff-tree", cmd_diff_tree, RUN_SETUP },
+ { "difftool", cmd_difftool, RUN_SETUP | NEED_WORK_TREE },
{ "fast-export", cmd_fast_export, RUN_SETUP },
{ "fetch", cmd_fetch, RUN_SETUP },
{ "fetch-pack", cmd_fetch_pack, 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_GENTLY },
+ { "grep", cmd_grep, RUN_SETUP_GENTLY | SUPPORT_SUPER_PREFIX },
{ "hash-object", cmd_hash_object },
{ "help", cmd_help },
{ "index-pack", cmd_index_pack, RUN_SETUP_GENTLY },
- { "init", cmd_init_db, NO_SETUP },
- { "init-db", cmd_init_db, NO_SETUP },
+ { "init", cmd_init_db },
+ { "init-db", cmd_init_db },
{ "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
{ "log", cmd_log, RUN_SETUP },
- { "ls-files", cmd_ls_files, RUN_SETUP },
+ { "ls-files", cmd_ls_files, RUN_SETUP | SUPPORT_SUPER_PREFIX },
{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
{ "ls-tree", cmd_ls_tree, RUN_SETUP },
- { "mailinfo", cmd_mailinfo },
+ { "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
{ "mailsplit", cmd_mailsplit },
{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
{ "merge-base", cmd_merge_base, RUN_SETUP },
{ "pack-objects", cmd_pack_objects, RUN_SETUP },
{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
{ "pack-refs", cmd_pack_refs, RUN_SETUP },
- { "patch-id", cmd_patch_id },
+ { "patch-id", cmd_patch_id, RUN_SETUP_GENTLY },
{ "pickaxe", cmd_blame, RUN_SETUP },
{ "prune", cmd_prune, RUN_SETUP },
{ "prune-packed", cmd_prune_packed, RUN_SETUP },
{ "pull", cmd_pull, RUN_SETUP | NEED_WORK_TREE },
{ "push", cmd_push, RUN_SETUP },
- { "read-tree", cmd_read_tree, RUN_SETUP },
+ { "read-tree", cmd_read_tree, RUN_SETUP | SUPPORT_SUPER_PREFIX},
+ { "rebase--helper", cmd_rebase__helper, RUN_SETUP | NEED_WORK_TREE },
{ "receive-pack", cmd_receive_pack },
{ "reflog", cmd_reflog, RUN_SETUP },
{ "remote", cmd_remote, RUN_SETUP },
{ "stage", cmd_add, RUN_SETUP | NEED_WORK_TREE },
{ "status", cmd_status, RUN_SETUP | NEED_WORK_TREE },
{ "stripspace", cmd_stripspace },
- { "submodule--helper", cmd_submodule__helper, RUN_SETUP },
+ { "submodule--helper", cmd_submodule__helper, RUN_SETUP | SUPPORT_SUPER_PREFIX},
{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
{ "tag", cmd_tag, RUN_SETUP },
{ "unpack-file", cmd_unpack_file, RUN_SETUP },
static void handle_builtin(int argc, const char **argv)
{
+ struct argv_array args = ARGV_ARRAY_INIT;
const char *cmd;
struct cmd_struct *builtin;
strip_extension(argv);
cmd = argv[0];
- /* Turn "git cmd --help" into "git help cmd" */
+ /* Turn "git cmd --help" into "git help --exclude-guides cmd" */
if (argc > 1 && !strcmp(argv[1], "--help")) {
+ int i;
+
argv[1] = argv[0];
argv[0] = cmd = "help";
+
+ for (i = 0; i < argc; i++) {
+ argv_array_push(&args, argv[i]);
+ if (!i)
+ argv_array_push(&args, "--exclude-guides");
+ }
+
+ argc++;
+ argv = args.argv;
}
builtin = get_builtin(cmd);
- if (builtin) {
- if (saved_environment && (builtin->option & NO_SETUP))
- restore_env();
- else
- exit(run_builtin(builtin, argc, argv));
- }
+ if (builtin)
+ exit(run_builtin(builtin, argc, argv));
+ argv_array_clear(&args);
}
static void execv_dashed_external(const char **argv)
{
- struct strbuf cmd = STRBUF_INIT;
- const char *tmp;
+ struct child_process cmd = CHILD_PROCESS_INIT;
int status;
+ if (get_super_prefix())
+ die("%s doesn't support --super-prefix", argv[0]);
+
if (use_pager == -1)
use_pager = check_pager_config(argv[0]);
commit_pager_choice();
- strbuf_addf(&cmd, "git-%s", argv[0]);
+ argv_array_pushf(&cmd.args, "git-%s", argv[0]);
+ argv_array_pushv(&cmd.args, argv + 1);
+ cmd.clean_on_exit = 1;
+ cmd.wait_after_clean = 1;
+ cmd.silent_exec_failure = 1;
- /*
- * argv[0] must be the git command, but the argv array
- * belongs to the caller, and may be reused in
- * subsequent loop iterations. Save argv[0] and
- * restore it on error.
- */
- tmp = argv[0];
- argv[0] = cmd.buf;
-
- trace_argv_printf(argv, "trace: exec:");
+ trace_argv_printf(cmd.args.argv, "trace: exec:");
/*
- * if we fail because the command is not found, it is
- * OK to return. Otherwise, we just pass along the status code.
+ * If we fail because the command is not found, it is
+ * OK to return. Otherwise, we just pass along the status code,
+ * or our usual generic code if we were not even able to exec
+ * the program.
*/
- status = run_command_v_opt(argv, RUN_SILENT_EXEC_FAILURE | RUN_CLEAN_ON_EXIT);
- if (status >= 0 || errno != ENOENT)
+ status = run_command(&cmd);
+ if (status >= 0)
exit(status);
-
- argv[0] = tmp;
-
- strbuf_release(&cmd);
+ else if (errno != ENOENT)
+ exit(128);
}
static int run_argv(int *argcp, const char ***argv)
int done_alias = 0;
while (1) {
- /* See if it's a builtin */
- handle_builtin(*argcp, *argv);
+ /*
+ * If we tried alias and futzed with our environment,
+ * it no longer is safe to invoke builtins directly in
+ * general. We have to spawn them as dashed externals.
+ *
+ * NEEDSWORK: if we can figure out cases
+ * where it is safe to do, we can avoid spawning a new
+ * process.
+ */
+ if (!done_alias)
+ handle_builtin(*argcp, *argv);
/* .. then try the external ones */
execv_dashed_external(*argv);
*/
if (done_alias)
break;
- save_env();
if (!handle_alias(argcp, argv))
break;
done_alias = 1;
return done_alias;
}
-/*
- * Many parts of Git have subprograms communicate via pipe, expect the
- * upstream of a pipe to die with SIGPIPE when the downstream of a
- * pipe does not need to read all that is written. Some third-party
- * programs that ignore or block SIGPIPE for their own reason forget
- * to restore SIGPIPE handling to the default before spawning Git and
- * break this carefully orchestrated machinery.
- *
- * Restore the way SIGPIPE is handled to default, which is what we
- * expect.
- */
-static void restore_sigpipe_to_default(void)
+int cmd_main(int argc, const char **argv)
{
- sigset_t unblock;
-
- sigemptyset(&unblock);
- sigaddset(&unblock, SIGPIPE);
- sigprocmask(SIG_UNBLOCK, &unblock, NULL);
- signal(SIGPIPE, SIG_DFL);
-}
-
-int main(int argc, char **av)
-{
- const char **argv = (const char **) av;
const char *cmd;
int done_help = 0;
- startup_info = &git_startup_info;
-
- cmd = git_extract_argv0_path(argv[0]);
+ cmd = argv[0];
if (!cmd)
cmd = "git-help";
-
- /*
- * Always open file descriptors 0/1/2 to avoid clobbering files
- * in die(). It also avoids messing up when the pipes are dup'ed
- * onto stdin/stdout/stderr in the child processes we spawn.
- */
- sanitize_stdfds();
-
- restore_sigpipe_to_default();
-
- git_setup_gettext();
+ else {
+ const char *slash = find_last_dir_sep(cmd);
+ if (slash)
+ cmd = slash + 1;
+ }
trace_command_performance(argv);