$ git clone -n https://src.fedoraproject.org/rpms/ghc-byteable.git /var/lib/mock/f38-build-side-42-init-devel-837004-28396/root/chroot_tmpdir/scmroot/ghc-byteable
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-837004-28396/root/chroot_tmpdir/scmroot/ghc-byteable'...
$ git fetch origin 2c2a490f16a7901a075d7dbb6c9df371cbc911e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-byteable
 * [new ref]         2c2a490f16a7901a075d7dbb6c9df371cbc911e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c2a490 Convert to %autorelease and %autochangelog