$ git clone -n https://src.fedoraproject.org/rpms/gxkb.git /var/lib/mock/f45-build-13294-448/root/chroot_tmpdir/scmroot/gxkb
Cloning into '/var/lib/mock/f45-build-13294-448/root/chroot_tmpdir/scmroot/gxkb'...
$ git fetch origin 2ded77967a09bb797ab2259c79b2193ee3fffd55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gxkb
 * [new ref]         2ded77967a09bb797ab2259c79b2193ee3fffd55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ded779 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild