$ git clone -n https://src.fedoraproject.org/rpms/kf5-libgravatar.git /var/lib/mock/f39-build-1587733-38222/root/chroot_tmpdir/scmroot/kf5-libgravatar
Cloning into '/var/lib/mock/f39-build-1587733-38222/root/chroot_tmpdir/scmroot/kf5-libgravatar'...
$ git fetch origin b6a5d76a74018d483c735112b126a11c9053b045:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-libgravatar
 * [new ref]         b6a5d76a74018d483c735112b126a11c9053b045 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b6a5d76 23.08.2