$ git clone -n https://github.com/xcp-ng-rpms/krb5.git /var/lib/mock/v8.3-incoming-10003-28660/root/chroot_tmpdir/scmroot/krb5
Cloning into '/var/lib/mock/v8.3-incoming-10003-28660/root/chroot_tmpdir/scmroot/krb5'...
$ git fetch origin 98c995156da0e5338004270f0c32241c4b11fb2b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/krb5
 * [new ref]         98c995156da0e5338004270f0c32241c4b11fb2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 98c9951 Make build dependency to latex optionnal