$ git clone -n https://src.fedoraproject.org/rpms/rubygem-hiera-vault.git /var/lib/mock/f45-build-34979-692/root/chroot_tmpdir/scmroot/rubygem-hiera-vault
Cloning into '/var/lib/mock/f45-build-34979-692/root/chroot_tmpdir/scmroot/rubygem-hiera-vault'...
$ git fetch origin 863fd8c43727e38425acb558a48df397ad30375c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-hiera-vault
 * [new ref]         863fd8c43727e38425acb558a48df397ad30375c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 863fd8c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild