$ git clone -n https://github.com/xcp-ng-rpms/krb5.git /var/lib/mock/v8.3-u-pcoval2-10011-28661/root/chroot_tmpdir/scmroot/krb5
Cloning into '/var/lib/mock/v8.3-u-pcoval2-10011-28661/root/chroot_tmpdir/scmroot/krb5'...
$ git fetch origin 8effa8c4de7845df71dbc9cff303a5323e55a851:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/krb5
 * [new ref]         8effa8c4de7845df71dbc9cff303a5323e55a851 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8effa8c bump release for test build