$ git clone -n https://src.fedoraproject.org/rpms/ghc-sendfile.git /var/lib/mock/f38-build-side-42-init-devel-771534-27758/root/chroot_tmpdir/scmroot/ghc-sendfile
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-771534-27758/root/chroot_tmpdir/scmroot/ghc-sendfile'...
$ git fetch origin d63bf1e9e9e764a2adb10b48bee3dd3374a77ebd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-sendfile
 * [new ref]         d63bf1e9e9e764a2adb10b48bee3dd3374a77ebd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d63bf1e Convert to %autorelease and %autochangelog