$ git clone -n https://src.fedoraproject.org/rpms/ghc-silently.git /var/lib/mock/f38-build-side-42-init-devel-727713-27336/root/chroot_tmpdir/scmroot/ghc-silently
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-727713-27336/root/chroot_tmpdir/scmroot/ghc-silently'...
$ git fetch origin e2d812f0826c8b1d81714fe2b2620fc671859e94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-silently
 * [new ref]         e2d812f0826c8b1d81714fe2b2620fc671859e94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2d812f Convert to %autorelease and %autochangelog