$ git clone -n https://src.fedoraproject.org/rpms/subunit.git /var/lib/mock/f39-build-1443109-32539/root/chroot_tmpdir/scmroot/subunit
Cloning into '/var/lib/mock/f39-build-1443109-32539/root/chroot_tmpdir/scmroot/subunit'...
$ git fetch origin b2a847e2186894cdd33cb2c07c19d2b24084dadc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/subunit
 * [new ref]         b2a847e2186894cdd33cb2c07c19d2b24084dadc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2a847e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild