$ git clone -n https://src.fedoraproject.org/rpms/guile22.git /var/lib/mock/f45-build-13243-447/root/chroot_tmpdir/scmroot/guile22
Cloning into '/var/lib/mock/f45-build-13243-447/root/chroot_tmpdir/scmroot/guile22'...
$ git fetch origin e4c7ebbaa5089eb0f5d2d6a64f6a6d2df040e53f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile22
 * [new ref]         e4c7ebbaa5089eb0f5d2d6a64f6a6d2df040e53f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4c7ebb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild