[PATCH] Added hook in git-receive-pack
Just before updating a ref,
$GIT_DIR/hooks/update refname old-sha1 new-sha1
is called if executable. The hook can decline the ref to be
updated by exiting with a non-zero status, or allow it to be
updated by exiting with a zero status. The mechanism also
allows e.g sending of a mail with pushed commits on the remote
repository.
Documentation update with an example hook is included.
jc: The credits of the basic idea and initial implementation go
to Josef, but I ended up rewriting major parts of his patch, so
bugs are all mine. Also I changed the semantics for the hook
from his original version (which were post-update hook) so that
the hook can optionally decline to update the ref, and also can
be used to implement the overall cleanups. The latter was
primarily to implement a suggestion from Linus that calling
update-server-info should be made optional.
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/run-command.c b/run-command.c
new file mode 100644
index 0000000..5117f62
--- /dev/null
+++ b/run-command.c
@@ -0,0 +1,60 @@
+#include "cache.h"
+#include "run-command.h"
+#include <sys/wait.h>
+
+static int run_external_command(int argc, const char **argv)
+{
+ pid_t pid = fork();
+
+ if (pid < 0)
+ return -ERR_RUN_COMMAND_FORK;
+ if (!pid) {
+ execvp(argv[0], (char *const*) argv);
+ return -ERR_RUN_COMMAND_EXEC;
+ }
+ for (;;) {
+ int status, code;
+ int retval = waitpid(pid, &status, 0);
+
+ if (retval < 0) {
+ if (errno == EINTR)
+ continue;
+ error("waitpid failed (%s)", strerror(retval));
+ return -ERR_RUN_COMMAND_WAITPID;
+ }
+ if (retval != pid)
+ return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
+ if (WIFSIGNALED(status))
+ return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
+
+ if (!WIFEXITED(status))
+ return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
+ code = WEXITSTATUS(status);
+ if (code)
+ return -code;
+ return 0;
+ }
+}
+
+int run_command(const char *cmd, ...)
+{
+ int argc;
+ const char *argv[MAX_RUN_COMMAND_ARGS];
+ const char *arg;
+ va_list param;
+
+ fprintf(stderr, "run-command %s (%d)\n", cmd, ERR_RUN_COMMAND_EXEC);
+
+ va_start(param, cmd);
+ argv[0] = cmd;
+ argc = 1;
+ while (argc < MAX_RUN_COMMAND_ARGS) {
+ arg = argv[argc++] = va_arg(param, char *);
+ if (!arg)
+ break;
+ }
+ va_end(param);
+ if (MAX_RUN_COMMAND_ARGS <= argc)
+ return error("too many args to run %s", cmd);
+ return run_external_command(argc, argv);
+}
