Extend jobs to support writing and use that for copy-pipe instead of

popen, from Chris Johnsen.

1 files changed, 27 insertions, 7 deletions

diff --git a/job.c b/job.c
index 64deeeab..b76b3345 100644
--- a/job.c
+++ b/job.c
@@ -33,13 +33,14 @@
  */
 
 void	job_callback(struct bufferevent *, short, void *);
+void	job_write_callback(struct bufferevent *, void *);
 
 /* All jobs list. */
 struct joblist	all_jobs = LIST_HEAD_INITIALIZER(all_jobs);
 
 /* Start a job running, if it isn't already. */
 struct job *
-job_run(const char *cmd,
+job_run(const char *cmd, struct session *s,
     void (*callbackfn)(struct job *), void (*freefn)(void *), void *data)
 {
 	struct job	*job;
@@ -52,7 +53,9 @@ job_run(const char *cmd,
 
 	environ_init(&env);
 	environ_copy(&global_environ, &env);
-	server_fill_environ(NULL, &env);
+	if (s != NULL)
+		environ_copy(&s->environ, &env);
+	server_fill_environ(s, &env);
 
 	switch (pid = fork()) {
 	case -1:
@@ -64,20 +67,20 @@ job_run(const char *cmd,
 		environ_push(&env);
 		environ_free(&env);
 
+		if (dup2(out[1], STDIN_FILENO) == -1)
+			fatal("dup2 failed");
 		if (dup2(out[1], STDOUT_FILENO) == -1)
 			fatal("dup2 failed");
-		if (out[1] != STDOUT_FILENO)
+		if (out[1] != STDIN_FILENO && out[1] != STDOUT_FILENO)
 			close(out[1]);
 		close(out[0]);
 
 		nullfd = open(_PATH_DEVNULL, O_RDWR, 0);
 		if (nullfd < 0)
 			fatal("open failed");
-		if (dup2(nullfd, STDIN_FILENO) == -1)
-			fatal("dup2 failed");
 		if (dup2(nullfd, STDERR_FILENO) == -1)
 			fatal("dup2 failed");
-		if (nullfd != STDIN_FILENO && nullfd != STDERR_FILENO)
+		if (nullfd != STDERR_FILENO)
 			close(nullfd);
 
 		closefrom(STDERR_FILENO + 1);
@@ -104,7 +107,8 @@ job_run(const char *cmd,
 	job->fd = out[0];
 	setblocking(job->fd, 0);
 
-	job->event = bufferevent_new(job->fd, NULL, NULL, job_callback, job);
+	job->event = bufferevent_new(job->fd, NULL, job_write_callback,
+	    job_callback, job);
 	bufferevent_enable(job->event, EV_READ);
 
 	log_debug("run job %p: %s, pid %ld", job, job->cmd, (long) job->pid);
@@ -133,6 +137,22 @@ job_free(struct job *job)
 	free(job);
 }
 
+/* Called when output buffer falls below low watermark (default is 0). */
+void
+job_write_callback(unused struct bufferevent *bufev, void *data)
+{
+	struct job	*job = data;
+	size_t		 len = EVBUFFER_LENGTH(EVBUFFER_OUTPUT(job->event));
+
+	log_debug("job write %p: %s, pid %ld, output left %lu", job, job->cmd,
+		    (long) job->pid, (unsigned long) len);
+
+	if (len == 0) {
+		shutdown(job->fd, SHUT_WR);
+		bufferevent_disable(job->event, EV_WRITE);
+	}
+}
+
 /* Job buffer error callback. */
 void
 job_callback(unused struct bufferevent *bufev, unused short events, void *data)