$ git clone -n https://src.fedoraproject.org/rpms/ghc-persistent.git /var/lib/mock/f39-build-1973027-43327/root/chroot_tmpdir/scmroot/ghc-persistent
Cloning into '/var/lib/mock/f39-build-1973027-43327/root/chroot_tmpdir/scmroot/ghc-persistent'...
$ git fetch origin d66fe3b3cf94e16bb70d4e02bd35cbe1b2eeee23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-persistent
 * [new ref]         d66fe3b3cf94e16bb70d4e02bd35cbe1b2eeee23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d66fe3b update to 2.14.5.1