$ git clone -n https://src.fedoraproject.org/rpms/libarcus.git /var/lib/mock/f40-build-785860-134131/root/chroot_tmpdir/scmroot/libarcus
Cloning into '/var/lib/mock/f40-build-785860-134131/root/chroot_tmpdir/scmroot/libarcus'...
$ git fetch origin 37869ab82e2abbfce20b7109593beb69ad4b01a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libarcus
 * [new ref]         37869ab82e2abbfce20b7109593beb69ad4b01a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37869ab Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild