$ git clone -n https://src.fedoraproject.org/rpms/fbreader.git /var/lib/mock/f39-build-1497176-34598/root/chroot_tmpdir/scmroot/fbreader
Cloning into '/var/lib/mock/f39-build-1497176-34598/root/chroot_tmpdir/scmroot/fbreader'...
$ git fetch origin 2912ea1ea5346d43cdc34c3d59df9e7e03349d77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fbreader
 * [new ref]         2912ea1ea5346d43cdc34c3d59df9e7e03349d77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2912ea1 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild