$ git clone -n https://src.fedoraproject.org/rpms/sourcextractor++.git /var/lib/mock/f40-build-781329-131566/root/chroot_tmpdir/scmroot/sourcextractor++
Cloning into '/var/lib/mock/f40-build-781329-131566/root/chroot_tmpdir/scmroot/sourcextractor++'...
$ git fetch origin bc0fc7e7a159b4ddbac535a7ce07b0807fcf9a44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sourcextractor++
 * [new ref]         bc0fc7e7a159b4ddbac535a7ce07b0807fcf9a44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc0fc7e Rebuild for wcslib 8.2