$ git clone -n https://github.com/xcp-ng-rpms/samba.git /var/lib/mock/v8.3-incoming-10160-28716/root/chroot_tmpdir/scmroot/samba
Cloning into '/var/lib/mock/v8.3-incoming-10160-28716/root/chroot_tmpdir/scmroot/samba'...
$ git fetch origin 152c210efc5883bd1405b56b7accc46dce9e4452:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/samba
 * [new ref]         152c210efc5883bd1405b56b7accc46dce9e4452 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 152c210 Rebuild with openssl-3