[kvm-unit-tests PATCH v5 03/29] migration: use a more robust way to wait for background job

[Nicholas Piggin <npiggin@gmail.com>]

Starting a pipeline of jobs in the background seems to not have a
simple way to reliably find the pid of a particular process. The
way PID of QEMU is sometimes causes a failure waiting on a PID that
is not running when stressing migration with later changes to do
multiple migrations.

Changing this to use $! is more robust in testing, and simpler.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 scripts/arch-run.bash | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/scripts/arch-run.bash b/scripts/arch-run.bash
index cc7da7c5..4d4e791c 100644
--- a/scripts/arch-run.bash
+++ b/scripts/arch-run.bash
@@ -131,6 +131,7 @@ run_migration ()
 
 	migsock=$(mktemp -u -t mig-helper-socket.XXXXXXXXXX)
 	migout1=$(mktemp -t mig-helper-stdout1.XXXXXXXXXX)
+	migout_fifo1=$(mktemp -u -t mig-helper-fifo-stdout1.XXXXXXXXXX)
 	qmp1=$(mktemp -u -t mig-helper-qmp1.XXXXXXXXXX)
 	qmp2=$(mktemp -u -t mig-helper-qmp2.XXXXXXXXXX)
 	fifo=$(mktemp -u -t mig-helper-fifo.XXXXXXXXXX)
@@ -143,8 +144,9 @@ run_migration ()
 	qmpout2=/dev/null
 
 	eval "$@" -chardev socket,id=mon1,path=${qmp1},server=on,wait=off \
-		-mon chardev=mon1,mode=control | tee ${migout1} &
-	live_pid=`jobs -l %+ | grep "eval" | awk '{print$2}'`
+		-mon chardev=mon1,mode=control > ${migout_fifo1} &
+	live_pid=$!
+	cat ${migout_fifo1} | tee ${migout1} &
 
 	# We have to use cat to open the named FIFO, because named FIFO's, unlike
 	# pipes, will block on open() until the other end is also opened, and that
@@ -152,7 +154,7 @@ run_migration ()
 	mkfifo ${fifo}
 	eval "$@" -chardev socket,id=mon2,path=${qmp2},server=on,wait=off \
 		-mon chardev=mon2,mode=control -incoming unix:${migsock} < <(cat ${fifo}) &
-	incoming_pid=`jobs -l %+ | awk '{print$2}'`
+	incoming_pid=$!
 
 	# The test must prompt the user to migrate, so wait for the "migrate" keyword
 	while ! grep -q -i "Now migrate the VM" < ${migout1} ; do
@@ -166,6 +168,9 @@ run_migration ()
 		sleep 1
 	done
 
+	# Wait until the destination has created the incoming socket
+	while ! [ -S ${migsock} ] ; do sleep 0.1 ; done
+
 	qmp ${qmp1} '"migrate", "arguments": { "uri": "unix:'${migsock}'" }' > ${qmpout1}
 
 	# Wait for the migration to complete
-- 
2.42.0