$ git clone -n https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-GZip.git /var/lib/mock/f45-build-27401-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-GZip
Cloning into '/var/lib/mock/f45-build-27401-624/root/chroot_tmpdir/scmroot/perl-WWW-Mechanize-GZip'...
$ git fetch origin 5b4e9af0f1aa079759b2652eb774e6882182d41e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-WWW-Mechanize-GZip
 * [new ref]         5b4e9af0f1aa079759b2652eb774e6882182d41e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b4e9af Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild