$ git clone -n https://src.fedoraproject.org/rpms/gmime.git /var/lib/mock/f39-build-1645000-40325/root/chroot_tmpdir/scmroot/gmime
Cloning into '/var/lib/mock/f39-build-1645000-40325/root/chroot_tmpdir/scmroot/gmime'...
$ git fetch origin 44e8a90e283d2634c40c950d9d4b8b150fd1104c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gmime
 * [new ref]         44e8a90e283d2634c40c950d9d4b8b150fd1104c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44e8a90 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild