$ git clone -n https://src.fedoraproject.org/rpms/ghc-brick.git /var/lib/mock/f38-build-side-42-init-devel-1086640-30035/root/chroot_tmpdir/scmroot/ghc-brick
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1086640-30035/root/chroot_tmpdir/scmroot/ghc-brick'...
$ git fetch origin 1876fef3659b7b095455a0fd929b3b462a6da590:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-brick
 * [new ref]         1876fef3659b7b095455a0fd929b3b462a6da590 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1876fef update to 1.4