$ git clone -n https://github.com/xcp-ng-rpms/libtdb.git /var/lib/mock/v8.3-u-pcoval1-11023-29455/root/chroot_tmpdir/scmroot/libtdb
Cloning into '/var/lib/mock/v8.3-u-pcoval1-11023-29455/root/chroot_tmpdir/scmroot/libtdb'...
$ git fetch origin 7dc2ccbcd967a9f5e564b8be08e832bb38682f31:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/libtdb
 * [new ref]         7dc2ccbcd967a9f5e564b8be08e832bb38682f31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7dc2ccb bump release for test build