oneway_merge(): only lstat() when told to update worktree

diff --git a/run-command.c b/run-command.c
index f9b7db23857a31ee037b0f900d0a5f2397c3d538..1101ef72378a502b1681a8e1bc306f38027974ae 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -1,8 +1,71 @@
 #include "cache.h"
 #include "run-command.h"
 #include "exec_cmd.h"
+#include "sigchain.h"
 #include "argv-array.h"
 
+#ifndef SHELL_PATH
+# define SHELL_PATH "/bin/sh"
+#endif
+
+struct child_to_clean {
+       pid_t pid;
+       struct child_to_clean *next;
+};
+static struct child_to_clean *children_to_clean;
+static int installed_child_cleanup_handler;
+
+static void cleanup_children(int sig)
+{
+       while (children_to_clean) {
+               struct child_to_clean *p = children_to_clean;
+               children_to_clean = p->next;
+               kill(p->pid, sig);
+               free(p);
+       }
+}
+
+static void cleanup_children_on_signal(int sig)
+{
+       cleanup_children(sig);
+       sigchain_pop(sig);
+       raise(sig);
+}
+
+static void cleanup_children_on_exit(void)
+{
+       cleanup_children(SIGTERM);
+}
+
+static void mark_child_for_cleanup(pid_t pid)
+{
+       struct child_to_clean *p = xmalloc(sizeof(*p));
+       p->pid = pid;
+       p->next = children_to_clean;
+       children_to_clean = p;
+
+       if (!installed_child_cleanup_handler) {
+               atexit(cleanup_children_on_exit);
+               sigchain_push_common(cleanup_children_on_signal);
+               installed_child_cleanup_handler = 1;
+       }
+}
+
+static void clear_child_for_cleanup(pid_t pid)
+{
+       struct child_to_clean **pp;
+
+       for (pp = &children_to_clean; *pp; pp = &(*pp)->next) {
+               struct child_to_clean *clean_me = *pp;
+
+               if (clean_me->pid == pid) {
+                       *pp = clean_me->next;
+                       free(clean_me);
+                       return;
+               }
+       }
+}
+
 static inline void close_pair(int fd[2])
 {
        close(fd[0]);
@@ -96,7 +159,11 @@ static const char **prepare_shell_cmd(const char **argv)
                die("BUG: shell command is empty");
 
        if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
+#ifndef WIN32
+               nargv[nargc++] = SHELL_PATH;
+#else
                nargv[nargc++] = "sh";
+#endif
                nargv[nargc++] = "-c";
 
                if (argc < 2)
@@ -194,6 +261,9 @@ static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
        } else {
                error("waitpid is confused (%s)", argv0);
        }
+
+       clear_child_for_cleanup(pid);
+
        errno = failed_errno;
        return code;
 }
@@ -356,6 +426,8 @@ int start_command(struct child_process *cmd)
        if (cmd->pid < 0)
                error("cannot fork() for %s: %s", cmd->argv[0],
                        strerror(failed_errno = errno));
+       else if (cmd->clean_on_exit)
+               mark_child_for_cleanup(cmd->pid);
 
        /*
         * Wait for child's execvp. If the execvp succeeds (or if fork()
@@ -376,6 +448,7 @@ int start_command(struct child_process *cmd)
                cmd->pid = -1;
        }
        close(notify_pipe[0]);
+
 }
 #else
 {
@@ -420,6 +493,8 @@ int start_command(struct child_process *cmd)
        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);
@@ -495,6 +570,7 @@ static void prepare_run_command_v_opt(struct child_process *cmd,
        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)
@@ -604,6 +680,8 @@ int start_async(struct async *async)
                exit(!!async->proc(proc_in, proc_out, async->data));
        }
 
+       mark_child_for_cleanup(async->pid);
+
        if (need_in)
                close(fdin[0]);
        else if (async->in)