$ git clone -n https://src.fedoraproject.org/rpms/regina-rexx.git /var/lib/mock/f39-build-1550862-36958/root/chroot_tmpdir/scmroot/regina-rexx
Cloning into '/var/lib/mock/f39-build-1550862-36958/root/chroot_tmpdir/scmroot/regina-rexx'...
$ git fetch origin 5f387f6088edf5f293fdb9bcd63926c3814c0ce6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/regina-rexx
 * [new ref]         5f387f6088edf5f293fdb9bcd63926c3814c0ce6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f387f6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild