$ git clone -n https://src.fedoraproject.org/rpms/rubygem-test_construct.git /var/lib/mock/f45-build-35373-695/root/chroot_tmpdir/scmroot/rubygem-test_construct
Cloning into '/var/lib/mock/f45-build-35373-695/root/chroot_tmpdir/scmroot/rubygem-test_construct'...
$ git fetch origin 6db938b6c97bd73ebb9a2ea768addd37c518150c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-test_construct
 * [new ref]         6db938b6c97bd73ebb9a2ea768addd37c518150c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6db938b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild