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# tested so far with:
# - no revision specified and remote has a HEAD which is used
# - revision specified and remote has a HEAD
# - revision specified and remote without HEAD
source $stdenv/setup
header "exporting $url (rev $rev) into $out"
git init $out
cd $out
git remote add origin "$url"
git fetch --progress origin
git remote set-head origin -a || (
test -n "$rev" && echo "that's ok, we want $rev" || exit 1)
if test -n "$rev"; then
echo "Trying to checkout: $rev"
parsed_rev=$(
git rev-parse --verify "$rev" 2>/dev/null ||
git rev-parse --verify origin/"$rev" 2>/dev/null
)
git reset --hard $parsed_rev
git checkout -b __nixos_build__
else
git checkout -b __nixos_build__ origin/HEAD
fi
if test -z "$leaveDotGit"; then
find $out -name .git\* | xargs rm -rf
fi
stopNest
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