$ git clone -n https://src.fedoraproject.org/rpms/python-unpaddedbase64.git /var/lib/mock/f40-build-2637256-66211/root/chroot_tmpdir/scmroot/python-unpaddedbase64
Cloning into '/var/lib/mock/f40-build-2637256-66211/root/chroot_tmpdir/scmroot/python-unpaddedbase64'...
$ git fetch origin d4d861cb98fd2a842bc4c079e5fb3a7ca8df23d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-unpaddedbase64
 * [new ref]         d4d861cb98fd2a842bc4c079e5fb3a7ca8df23d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4d861c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild