$ git clone -n https://src.fedoraproject.org/rpms/goocanvas2.git /var/lib/mock/f45-build-12859-444/root/chroot_tmpdir/scmroot/goocanvas2
Cloning into '/var/lib/mock/f45-build-12859-444/root/chroot_tmpdir/scmroot/goocanvas2'...
$ git fetch origin 2ee6bd25fd5789acd53a70763b8e1ca6a97f2fb1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/goocanvas2
 * [new ref]         2ee6bd25fd5789acd53a70763b8e1ca6a97f2fb1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ee6bd2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild