$ git clone -n https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-TreeBuilder.git /var/lib/mock/f41-build-side-1-2933374-35202/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-TreeBuilder
Cloning into '/var/lib/mock/f41-build-side-1-2933374-35202/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-TreeBuilder'...
$ git fetch origin d8e7fdd01a6f800972e6d9cd825ccf5f10c9d44f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-TreeBuilder
 * [new ref]         d8e7fdd01a6f800972e6d9cd825ccf5f10c9d44f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8e7fdd convert GPL+ or Artistic license to SPDX