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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).
This commit is contained in:
Ben Boeckel 2016-06-16 11:21:26 -04:00 committed by Brad King
parent 86f1d70445
commit dcb2e39fda
1 changed files with 7 additions and 1 deletions
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8
Utilities/Scripts/update-third-party.bash
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@ -155,8 +155,14 @@ popd
if [ -n "$basehash" ]; then
git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
else
unrelated_histories_flag=""
if git merge --help | grep -q -e allow-unrelated-histories; then
unrelated_histories_flag="--allow-unrelated-histories "
fi
readonly unrelated_histories_flag
git fetch "$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"
fi
git commit --no-edit