$ git clone -n https://src.fedoraproject.org/rpms/linux-system-roles.git /var/lib/mock/f39-build-1580403-38066/root/chroot_tmpdir/scmroot/linux-system-roles
Cloning into '/var/lib/mock/f39-build-1580403-38066/root/chroot_tmpdir/scmroot/linux-system-roles'...
$ git fetch origin a4d561c986718824d6e7005d9b2383636bd1deb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/linux-system-roles
 * [new ref]         a4d561c986718824d6e7005d9b2383636bd1deb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4d561c [packit] 1.55.1 upstream release