[kvm-unit-tests PATCH v4 11/13] scripts/runtime: skip tests that cannot run

["Radim Krčmář" <rkrcmar@redhat.com>]

A case where QEMU won't run the kernel should be considered as skipped.
Hyper-V tests used to FAIL on old QEMUs.  The infamous QEMU=/dev/null
FAIL streak is covered too.  Some error messages in arch/run were
reworded, because they are now visible in summary.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
 v4:
 * clarified "kvm only" error message [Drew+Lukáš]
 * used _NO_FILE_4Uhere_ instead of /dev/null [Drew]
 * completely reworked output, now prints the last line

 arm/run              |  2 +-
 powerpc/run          |  2 +-
 scripts/runtime.bash | 28 +++++++++++++++++++++++++++-
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/arm/run b/arm/run
index ebf703d5757c..a2f35ef6a7e6 100755
--- a/arm/run
+++ b/arm/run
@@ -19,7 +19,7 @@ if [ -c /dev/kvm ]; then
 fi
 
 if [ "$ACCEL" = "kvm" ] && [ "$kvm_available" != "yes" ]; then
-	echo "skip $TESTNAME (kvm only)"
+	echo "KVM is needed, but not available on this host"
 	exit 2
 fi
 
diff --git a/powerpc/run b/powerpc/run
index 56698e622592..14988a75b1e2 100755
--- a/powerpc/run
+++ b/powerpc/run
@@ -16,7 +16,7 @@ if [ -c /dev/kvm ]; then
 fi
 
 if [ "$ACCEL" = "kvm" ] && [ "$kvm_available" != "yes" ]; then
-	echo "skip $TESTNAME (kvm only)"
+	echo "KVM is needed, but not available on this host"
 	exit 2
 fi
 
diff --git a/scripts/runtime.bash b/scripts/runtime.bash
index deae077e50a1..c9ab9ba47d81 100644
--- a/scripts/runtime.bash
+++ b/scripts/runtime.bash
@@ -11,6 +11,27 @@ extract_summary()
     tail -1 | grep '^SUMMARY: ' | sed 's/^SUMMARY: /(/;s/$/)/'
 }
 
+# We assume that QEMU is going to work if it tried to load the kernel
+premature_failure()
+{
+    local log="$(eval $(get_cmdline _NO_FILE_4Uhere_) 2>&1)"
+    local last_line=$(tail -1 <<< "$log")
+
+    echo "$last_line" | grep -qi "could not load kernel" &&
+        return 1
+
+    RUNTIME_log_stderr <<< "$log"
+
+    echo "$last_line"
+    return 0
+}
+
+get_cmdline()
+{
+    local kernel=$1
+    echo "TESTNAME=$testname TIMEOUT=$timeout ACCEL=$accel $RUNTIME_arch_run $kernel -smp $smp $opts"
+}
+
 function run()
 {
     local testname="$1"
@@ -48,7 +69,12 @@ function run()
         fi
     done
 
-    cmdline="TESTNAME=$testname TIMEOUT=$timeout ACCEL=$accel $RUNTIME_arch_run $kernel -smp $smp $opts"
+    last_line=$(premature_failure) && {
+        echo "`SKIP` $1 ($last_line)"
+        return 77
+    }
+
+    cmdline=$(get_cmdline $kernel)
     if [ "$verbose" = "yes" ]; then
         echo $cmdline
     fi
-- 
2.8.2