$ git clone -n https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-TreeBuilder.git /var/lib/mock/f45-build-27410-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-TreeBuilder
Cloning into '/var/lib/mock/f45-build-27410-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-TreeBuilder'...
$ git fetch origin 1043e1ba44de0882c17f8e11d6e9abd1df50904c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-TreeBuilder
 * [new ref]         1043e1ba44de0882c17f8e11d6e9abd1df50904c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1043e1b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild