[Qemu-devel] [PATCH 3/4] iotests: add timestamp skip feature

[John Snow <jsnow@redhat.com>]

Like a makefile, try to skip tests if we know they have already been
executed using the current set of external dependencies.

If a user passes the -ts option to ./check, if a test or its output
or its dependencies (qemu, qemu-nbd, qemu-io, qemu-img,
socket-scm-helper) have been modified, the test will be skipped.

This is primarily to speed up running bisectability tests for larger
series where each interim patch may or may not change all of the
dependencies, so some tests can be skipped.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/qemu-iotests/check  | 56 ++++++++++++++++++++++++++++++++++++++++++++++-
 tests/qemu-iotests/common |  6 +++++
 2 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index baeae80..0db40e2 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -141,6 +141,51 @@ _timestamp()
     echo -n " [$now]"
 }
 
+_okfile()
+{
+    echo "ts/${IMGPROTO}/${IMGFMT}/${1}.ok"
+}
+
+# _hasdep <seq> <dep>
+_hasdep()
+{
+    grep -q "^${1}.*${2}" "${source_iotests}/group"
+}
+
+# _skippable <seq>
+_skippable()
+{
+    tsfile=$(_okfile "${1}")
+    deps=(${QEMU_IMG} \
+              ${QEMU_IO} \
+              "${source_iotests}/${1}" \
+              "${source_iotests}/${1}.out" \
+              "${source_iotests}/common" \
+              "${source_iotests}/common.rc" \
+              "${source_iotests}/common.env" \
+              "${source_iotests}/common.config")
+
+    if _hasdep "${1}" "scm"; then
+        deps+=("${SOCKET_SCM_HELPER}")
+    fi
+
+    if _hasdep "${1}" "nbd" || [ "$IMGPROTO" = "nbd" ]; then
+        deps+=("${QEMU_NBD}")
+    fi
+
+    if _hasdep "${1}" "qemu"; then
+        deps+=("${QEMU}")
+    fi
+
+    if [ ! -e "${tsfile}" ]; then return 1; fi
+    for dep in "${deps[@]}"; do
+        if [ "${tsfile}" -ot "${dep}" ]; then return 1; fi
+    done
+
+    # Looks skippable, .ok file is newer than all external dependencies.
+    return 0
+}
+
 _wrapup()
 {
     # for hangcheck ...
@@ -268,6 +313,10 @@ do
         echo " - expunged"
         rm -f $seq.out.bad
         echo "/^$seq\$/d" >>$tmp.expunged
+
+    elif [ "${ts_skip}" == "true" ] && _skippable "${seq}"; then
+        echo "         [skip] (Results are recent)"
+
     elif [ ! -f "$source_iotests/$seq" ]
     then
         echo " - no such test?"
@@ -275,7 +324,8 @@ do
     else
         # really going to try and run this one
         #
-        rm -f $seq.out.bad
+        tsfile="$(_okfile ${seq})"
+        rm -f $seq.out.bad "${tsfile}"
         lasttime=`sed -n -e "/^$seq /s/.* //p" <check.time`
         if [ "X$lasttime" != X ]; then
                 echo -n " ${lasttime}s ..."
@@ -340,6 +390,10 @@ do
                     then
                         :
                     else
+                        if [ ! -d "$(dirname ${tsfile})" ]; then
+                            mkdir -p "$(dirname ${tsfile})"
+                        fi
+                        touch "${tsfile}"
                         echo "$seq `expr $stop - $start`" >>$tmp.time
                     fi
                 else
diff --git a/tests/qemu-iotests/common b/tests/qemu-iotests/common
index c4d0742..b3d869e 100644
--- a/tests/qemu-iotests/common
+++ b/tests/qemu-iotests/common
@@ -161,6 +161,8 @@ check options
     -T                  output timestamps
     -r                  randomize test order
     -c mode             cache mode
+    -ts                 timestamp skip: skip tests when already ran and
+                                   no dependencies have changed on disk.
 
 testlist options
     -g group[,group...]        include tests from these groups
@@ -319,6 +321,10 @@ testlist options
             xpand=false
             ;;
 
+        -ts)
+            ts_skip=true
+            xpand=false
+            ;;
         -v)
             verbose=true
             xpand=false
-- 
2.1.0