#include "sigchain.h"
#include "argv-array.h"
-#ifndef SHELL_PATH
-# define SHELL_PATH "/bin/sh"
-#endif
+void child_process_init(struct child_process *child)
+{
+ memset(child, 0, sizeof(*child));
+ argv_array_init(&child->args);
+ argv_array_init(&child->env_array);
+}
struct child_to_clean {
pid_t pid;
static struct child_to_clean *children_to_clean;
static int installed_child_cleanup_handler;
-static void cleanup_children(int sig)
+static void cleanup_children(int sig, int in_signal)
{
while (children_to_clean) {
struct child_to_clean *p = children_to_clean;
children_to_clean = p->next;
kill(p->pid, sig);
- free(p);
+ if (!in_signal)
+ free(p);
}
}
static void cleanup_children_on_signal(int sig)
{
- cleanup_children(sig);
+ cleanup_children(sig, 1);
sigchain_pop(sig);
raise(sig);
}
static void cleanup_children_on_exit(void)
{
- cleanup_children(SIGTERM);
+ cleanup_children(SIGTERM, 0);
}
static void mark_child_for_cleanup(pid_t pid)
#endif
#ifndef GIT_WINDOWS_NATIVE
-static int child_err = 2;
static int child_notifier = -1;
static void notify_parent(void)
*/
xwrite(child_notifier, "", 1);
}
-
-static NORETURN void die_child(const char *err, va_list params)
-{
- vwritef(child_err, "fatal: ", err, params);
- exit(128);
-}
-
-static void error_child(const char *err, va_list params)
-{
- vwritef(child_err, "error: ", err, params);
-}
#endif
static inline void set_cloexec(int fd)
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}
-static int wait_or_whine(pid_t pid, const char *argv0)
+static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
{
int status, code = -1;
pid_t waiting;
while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
; /* nothing */
+ if (in_signal)
+ return 0;
if (waiting < 0) {
failed_errno = errno;
int failed_errno;
char *str;
+ if (!cmd->argv)
+ cmd->argv = cmd->args.argv;
+ if (!cmd->env)
+ cmd->env = cmd->env_array.argv;
+
/*
* In case of errors we must keep the promise to close FDs
* that have been passed in via ->in and ->out.
fail_pipe:
error("cannot create %s pipe for %s: %s",
str, cmd->argv[0], strerror(failed_errno));
+ argv_array_clear(&cmd->args);
+ argv_array_clear(&cmd->env_array);
errno = failed_errno;
return -1;
}
* in subsequent call paths use the parent's stderr.
*/
if (cmd->no_stderr || need_err) {
- child_err = dup(2);
+ int child_err = dup(2);
set_cloexec(child_err);
+ set_error_handle(fdopen(child_err, "w"));
}
- set_die_routine(die_child);
- set_error_routine(error_child);
close(notify_pipe[0]);
set_cloexec(notify_pipe[1]);
* At this point we know that fork() succeeded, but execvp()
* failed. Errors have been reported to our stderr.
*/
- wait_or_whine(cmd->pid, cmd->argv[0]);
+ wait_or_whine(cmd->pid, cmd->argv[0], 0);
failed_errno = errno;
cmd->pid = -1;
}
{
int fhin = 0, fhout = 1, fherr = 2;
const char **sargv = cmd->argv;
- char **env = environ;
if (cmd->no_stdin)
fhin = open("/dev/null", O_RDWR);
else if (cmd->out > 1)
fhout = dup(cmd->out);
- if (cmd->env)
- env = make_augmented_environ(cmd->env);
-
if (cmd->git_cmd)
cmd->argv = prepare_git_cmd(cmd->argv);
else if (cmd->use_shell)
cmd->argv = prepare_shell_cmd(cmd->argv);
- cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir,
- fhin, fhout, fherr);
+ cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
+ cmd->dir, fhin, fhout, fherr);
failed_errno = errno;
if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
if (cmd->clean_on_exit && cmd->pid >= 0)
mark_child_for_cleanup(cmd->pid);
- if (cmd->env)
- free_environ(env);
if (cmd->git_cmd)
free(cmd->argv);
close_pair(fderr);
else if (cmd->err)
close(cmd->err);
+ argv_array_clear(&cmd->args);
+ argv_array_clear(&cmd->env_array);
errno = failed_errno;
return -1;
}
int finish_command(struct child_process *cmd)
{
- return wait_or_whine(cmd->pid, cmd->argv[0]);
+ int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0);
+ argv_array_clear(&cmd->args);
+ argv_array_clear(&cmd->env_array);
+ return ret;
}
+int finish_command_in_signal(struct child_process *cmd)
+{
+ return wait_or_whine(cmd->pid, cmd->argv[0], 1);
+}
+
+
int run_command(struct child_process *cmd)
{
- int code = start_command(cmd);
+ int code;
+
+ if (cmd->out < 0 || cmd->err < 0)
+ die("BUG: run_command with a pipe can cause deadlock");
+
+ code = start_command(cmd);
if (code)
return code;
return finish_command(cmd);
}
-static void prepare_run_command_v_opt(struct child_process *cmd,
- const char **argv,
- int opt)
-{
- memset(cmd, 0, sizeof(*cmd));
- cmd->argv = argv;
- cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
- cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
- cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
- cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
- cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
- cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
-}
-
int run_command_v_opt(const char **argv, int opt)
{
- struct child_process cmd;
- prepare_run_command_v_opt(&cmd, argv, opt);
- return run_command(&cmd);
+ return run_command_v_opt_cd_env(argv, opt, NULL, NULL);
}
int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
{
- struct child_process cmd;
- prepare_run_command_v_opt(&cmd, argv, opt);
+ struct child_process cmd = CHILD_PROCESS_INIT;
+ cmd.argv = argv;
+ cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
+ cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
+ cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
+ cmd.silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
+ cmd.use_shell = opt & RUN_USING_SHELL ? 1 : 0;
+ cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
cmd.dir = dir;
cmd.env = env;
return run_command(&cmd);
return ret != NULL;
}
+#else
+
+static struct {
+ void (**handlers)(void);
+ size_t nr;
+ size_t alloc;
+} git_atexit_hdlrs;
+
+static int git_atexit_installed;
+
+static void git_atexit_dispatch(void)
+{
+ size_t i;
+
+ for (i=git_atexit_hdlrs.nr ; i ; i--)
+ git_atexit_hdlrs.handlers[i-1]();
+}
+
+static void git_atexit_clear(void)
+{
+ free(git_atexit_hdlrs.handlers);
+ memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs));
+ git_atexit_installed = 0;
+}
+
+#undef atexit
+int git_atexit(void (*handler)(void))
+{
+ ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc);
+ git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler;
+ if (!git_atexit_installed) {
+ if (atexit(&git_atexit_dispatch))
+ return -1;
+ git_atexit_installed = 1;
+ }
+ return 0;
+}
+#define atexit git_atexit
+
#endif
int start_async(struct async *async)
close(fdin[1]);
if (need_out)
close(fdout[0]);
+ git_atexit_clear();
exit(!!async->proc(proc_in, proc_out, async->data));
}
int finish_async(struct async *async)
{
#ifdef NO_PTHREADS
- return wait_or_whine(async->pid, "child process");
+ return wait_or_whine(async->pid, "child process", 0);
#else
void *ret = (void *)(intptr_t)(-1);
#endif
}
-char *find_hook(const char *name)
+const char *find_hook(const char *name)
{
- char *path = git_path("hooks/%s", name);
- if (access(path, X_OK) < 0)
- path = NULL;
+ static struct strbuf path = STRBUF_INIT;
- return path;
+ strbuf_reset(&path);
+ strbuf_git_path(&path, "hooks/%s", name);
+ if (access(path.buf, X_OK) < 0)
+ return NULL;
+ return path.buf;
}
int run_hook_ve(const char *const *env, const char *name, va_list args)
{
- struct child_process hook;
- struct argv_array argv = ARGV_ARRAY_INIT;
+ struct child_process hook = CHILD_PROCESS_INIT;
const char *p;
- int ret;
p = find_hook(name);
if (!p)
return 0;
- argv_array_push(&argv, p);
-
+ argv_array_push(&hook.args, p);
while ((p = va_arg(args, const char *)))
- argv_array_push(&argv, p);
-
- memset(&hook, 0, sizeof(hook));
- hook.argv = argv.argv;
+ argv_array_push(&hook.args, p);
hook.env = env;
hook.no_stdin = 1;
hook.stdout_to_stderr = 1;
- ret = run_command(&hook);
- argv_array_clear(&argv);
- return ret;
+ return run_command(&hook);
}
int run_hook_le(const char *const *env, const char *name, ...)
return ret;
}
-int run_hook_with_custom_index(const char *index_file, const char *name, ...)
+int capture_command(struct child_process *cmd, struct strbuf *buf, size_t hint)
{
- const char *hook_env[3] = { NULL };
- char index[PATH_MAX];
- va_list args;
- int ret;
-
- snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
- hook_env[0] = index;
+ cmd->out = -1;
+ if (start_command(cmd) < 0)
+ return -1;
- va_start(args, name);
- ret = run_hook_ve(hook_env, name, args);
- va_end(args);
+ if (strbuf_read(buf, cmd->out, hint) < 0) {
+ close(cmd->out);
+ finish_command(cmd); /* throw away exit code */
+ return -1;
+ }
- return ret;
+ close(cmd->out);
+ return finish_command(cmd);
}