vmcheck: add timeout option for vm_ssh_wait

Closes: #360
Approved by: cgwalters

tests/README.md

@@ -6,7 +6,7 @@ Tests are divided into two groups:
 
 - Tests in the `vmcheck` directory are destructive and
   installed. They are run inside a VM. Use `make vmcheck` to
-  run these.
+  run these (see also `HACKING.md` in the top directory).
 
 The `common` directory contains files used by multiple
 tests. The `utils` directory contains helper utilities

tests/common/libvm.sh

@@ -33,18 +33,25 @@ vm_send() {
 }
 
 # wait until ssh is available on the vm
+# - $1    timeout in second (optional)
 vm_ssh_wait() {
-  # XXX: add timeout
+  timeout=${1:-0}
-  while ! vm_cmd true &> /dev/null; do
+  while [ $timeout -gt 0 ]; do
+    if vm_cmd true &> /dev/null; then
+      return 0
+    fi
+    timeout=$((timeout - 1))
     sleep 1
   done
+  # final check at the timeout mark
+  vm_cmd true &> /dev/null
 }
 
 # reboot the vm
 vm_reboot() {
   vm_cmd systemctl reboot || :
   sleep 2 # give time for port to go down
-  vm_ssh_wait
+  vm_ssh_wait 10
 }
 
 # check that the given files exist on the VM

tests/vmcheck/test.sh

@@ -9,8 +9,10 @@ echo "  ControlPersist yes" >> ssh-config
 export SSH="ssh -F $PWD/ssh-config vmcheck"
 export SCP="scp -F $PWD/ssh-config"
 
+. ${commondir}/libvm.sh
+
 # stand up ssh connection and sanity check that it all works
-if ! $SSH true &> /dev/null; then
+if ! vm_ssh_wait 10; then
   echo "ERROR: A running VM is required for 'make vmcheck'."
   exit 1
 fi