$ git clone -n https://src.fedoraproject.org/rpms/rubygem-rack-test.git /var/lib/mock/f40-build-2034172-47874/root/chroot_tmpdir/scmroot/rubygem-rack-test
Cloning into '/var/lib/mock/f40-build-2034172-47874/root/chroot_tmpdir/scmroot/rubygem-rack-test'...
$ git fetch origin 3dc889053e52c13f399d04fe11dcd852f7aa4edc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-rack-test
 * [new ref]         3dc889053e52c13f399d04fe11dcd852f7aa4edc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3dc8890 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild