$ git clone -n https://src.fedoraproject.org/rpms/gthumb.git /var/lib/mock/f31-build-50571-27415/root/thebuilddir/tmp/scmroot/gthumb
Cloning into '/var/lib/mock/f31-build-50571-27415/root/thebuilddir/tmp/scmroot/gthumb'...
$ git reset --hard 925974ba7bd7cfe6ee805c939afb9bf361c7aea8
HEAD is now at 925974b Update to 3.8.0