$ git clone -n https://src.fedoraproject.org/rpms/ghc-half.git /var/lib/mock/f38-build-side-42-init-devel-727309-27333/root/chroot_tmpdir/scmroot/ghc-half
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-727309-27333/root/chroot_tmpdir/scmroot/ghc-half'...
$ git fetch origin 1fb5d3bef322c6a133b50b048127c922b41fbd90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-half
 * [new ref]         1fb5d3bef322c6a133b50b048127c922b41fbd90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1fb5d3b Convert to %autorelease and %autochangelog