$ git clone -n https://src.fedoraproject.org/rpms/ghc-base-orphans.git /var/lib/mock/f38-build-side-42-init-devel-967019-28808/root/chroot_tmpdir/scmroot/ghc-base-orphans
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-967019-28808/root/chroot_tmpdir/scmroot/ghc-base-orphans'...
$ git fetch origin 86f3e14e2a3a805a589eb35cbc2da100eb1ed345:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-base-orphans
 * [new ref]         86f3e14e2a3a805a589eb35cbc2da100eb1ed345 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86f3e14 Convert to %autorelease and %autochangelog