$ git clone -n https://src.fedoraproject.org/rpms/tkimg.git /var/lib/mock/f40-build-2331083-59051/root/chroot_tmpdir/scmroot/tkimg
Cloning into '/var/lib/mock/f40-build-2331083-59051/root/chroot_tmpdir/scmroot/tkimg'...
$ git fetch origin 12771f0d53201e74a92a825b70345b2178e2aa69:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tkimg
 * [new ref]         12771f0d53201e74a92a825b70345b2178e2aa69 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12771f0 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild