$ git clone -n https://src.fedoraproject.org/rpms/ghc-cautious-file.git /var/lib/mock/f45-build-10093-413/root/chroot_tmpdir/scmroot/ghc-cautious-file
Cloning into '/var/lib/mock/f45-build-10093-413/root/chroot_tmpdir/scmroot/ghc-cautious-file'...
$ git fetch origin fbf66726b27f5b3ad5ef9387a911421092018225:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cautious-file
 * [new ref]         fbf66726b27f5b3ad5ef9387a911421092018225 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbf6672 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild