$ git clone -n https://src.fedoraproject.org/rpms/libgnomecanvas.git /var/lib/mock/f45-build-16275-484/root/chroot_tmpdir/scmroot/libgnomecanvas
Cloning into '/var/lib/mock/f45-build-16275-484/root/chroot_tmpdir/scmroot/libgnomecanvas'...
$ git fetch origin e5768fa039776b6206e1d52df2f44cc5cfdbc194:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libgnomecanvas
 * [new ref]         e5768fa039776b6206e1d52df2f44cc5cfdbc194 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5768fa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild