update-third-party: support Git 2.9.0's new merge restrictions
Use the `--allow-unrelated-histories` flag to declare that we Know What We're Doing™ (but only if necessary).
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@ -155,8 +155,14 @@ popd
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if [ -n "$basehash" ]; then
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git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
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else
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unrelated_histories_flag=""
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if git merge --help | grep -q -e allow-unrelated-histories; then
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unrelated_histories_flag="--allow-unrelated-histories "
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fi
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readonly unrelated_histories_flag
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git fetch "$extractdir" "upstream-$name:upstream-$name"
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git merge --log -s ours --no-commit "upstream-$name"
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git merge --log -s ours --no-commit $unrelated_histories_flag "upstream-$name"
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git read-tree -u --prefix="$subtree/" "upstream-$name"
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fi
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git commit --no-edit
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