$ git clone -n https://src.fedoraproject.org/rpms/perl-Package-Generator.git /var/lib/mock/f45-build-25611-612/root/chroot_tmpdir/scmroot/perl-Package-Generator
Cloning into '/var/lib/mock/f45-build-25611-612/root/chroot_tmpdir/scmroot/perl-Package-Generator'...
$ git fetch origin 7b98d70215547832d4340c206d3ddea4f8590920:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Package-Generator
 * [new ref]         7b98d70215547832d4340c206d3ddea4f8590920 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b98d70 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild