btrfs-progs: tests: limit size of log dump from conver tests

The convert tests generate lots of log material, travis CI has limit 4MB
so we don't see anything useful when a late test fails.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/tests/convert-tests.sh b/tests/convert-tests.sh
index 57fd925..8e97b22 100755 (executable)
--- a/tests/convert-tests.sh
+++ b/tests/convert-tests.sh
@@ -41,7 +41,9 @@ run_one_test() {
                ./test.sh
                if [ $? -ne 0 ]; then
                        if [[ $TEST_LOG =~ dump ]]; then
-                               cat "$RESULTS"
+                               # the logs can be large and may exceed the
+                               # limits, use 4MB for now
+                               tail -c 3900000 "$RESULTS"
                        fi
                        _fail "test failed for case $testname"
                fi