$ git clone -n https://src.fedoraproject.org/rpms/php-ast.git /var/lib/mock/f41-build-808519-145919/root/chroot_tmpdir/scmroot/php-ast
Cloning into '/var/lib/mock/f41-build-808519-145919/root/chroot_tmpdir/scmroot/php-ast'...
$ git fetch origin 98bdb6f33d4338bd229996f3fe74aae9a2608cba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-ast
 * [new ref]         98bdb6f33d4338bd229996f3fe74aae9a2608cba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98bdb6f drop 32-bit support