Commit e6df58a5578fee7a50bbf36f4a50a2781cff855d
Author: Hanna Reitz <hreitz@redhat.com>
Date: Wed May 8 23:18:18 2019 +0200
qemu-nbd: Do not close stderr
has introduced an interesting regression. Original behavior of
ssh somehost qemu-nbd /home/den/tmp/file -f raw --fork
was the following:
* qemu-nbd was started as a daemon
* the command execution is done and ssh exited with success
The patch has changed this behavior and 'ssh' command now hangs forever.
According to the normal specification of the daemon() call, we should
endup with STDERR pointing to /dev/null. That should be done at the
very end of the successful startup sequence when the pipe to the
bootstrap process (used for diagnostics) is no longer needed.
This could be achived in the same way as done for 'qemu-nbd -c' case.
That was commit 0eaf453e, also fixing up e6df58a5. STDOUT copying to
STDERR does the trick.
This also leads to proper 'ssh' connection closing which fixes my
original problem.
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Eric Blake <eblake@redhat.com>
CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
CC: Hanna Reitz <hreitz@redhat.com>
CC: <qemu-stable@nongnu.org>
---
qemu-nbd.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 77f98c736b..186ce9474c 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -274,6 +274,7 @@ static void *show_parts(void *arg)
struct NbdClientOpts {
char *device;
+ bool fork_process;
};
static void *nbd_client_thread(void *arg)
@@ -317,7 +318,7 @@ static void *nbd_client_thread(void *arg)
/* update partition table */
pthread_create(&show_parts_thread, NULL, show_parts, opts->device);
- if (verbose) {
+ if (verbose && !opts->fork_process) {