verify-subtree.sh: relax check and ignore old content

If for whatever reasons a repo already had a `release-tools` directory before doing a clean import of it with `git subtree`, the check used to fail because it found those old commits. This can be fixed by telling `git log` to stop when the directory disappears from the repo. There has to be a commit with removes the old content, because otherwise `git subtree add` doesn't work. Fixes: https://github.com/kubernetes-csi/external-resizer/issues/21

verify-subtree.sh: relax check and ignore old content
cc564f92 · Patrick Ohly · 33d58fdc · cc564f92
Commit cc564f92 authored Mar 06, 2019 by Patrick Ohly
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verify-subtree.sh verify-subtree.sh +1 -1

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--- a/verify-subtree.sh
+++ b/verify-subtree.sh
@@ -30,7 +30,7 @@ if [ ! "$DIR" ]; then
    exit 1
 fi
-REV=$(git log -n1 --format=format:%H --no-merges -- "$DIR")
+REV=$(git log -n1 --remove-empty --format=format:%H --no-merges -- "$DIR")
 if [ "$REV" ]; then
    echo "Directory '$DIR' contains non-upstream changes:"
    echo