$ git clone -n https://src.fedoraproject.org/rpms/libmypaint.git /var/lib/mock/f45-build-16598-488/root/chroot_tmpdir/scmroot/libmypaint
Cloning into '/var/lib/mock/f45-build-16598-488/root/chroot_tmpdir/scmroot/libmypaint'...
$ git fetch origin 8fae79fe86012040f330b392eb49a29b7fcf21b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmypaint
 * [new ref]         8fae79fe86012040f330b392eb49a29b7fcf21b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8fae79f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild