Commit 5ebc79de authored by Ben Boeckel's avatar Ben Boeckel

update-common: support 2.9.0's new merge restrictions

This flag is required for newer git. Declare that we Know What We're
Doing (but only if necessary).
parent f09764ed
......@@ -155,8 +155,14 @@ popd
if [ -n "$basehash" ]; then
git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
if git merge --help | grep -q -e allow-unrelated-histories; then
unrelated_histories_flag="--allow-unrelated-histories "
readonly unrelated_histories_flag
git fetch "$extractdir" "upstream-$name:upstream-$name"
git merge --log -s ours --no-commit "upstream-$name"
git merge --log -s ours --no-commit $unrelated_histories_flag "upstream-$name"
git read-tree -u --prefix="$subtree/" "upstream-$name"
git commit --no-edit
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