$ git clone -n https://src.fedoraproject.org/rpms/perl-Set-Scalar.git /var/lib/mock/f45-build-26211-616/root/chroot_tmpdir/scmroot/perl-Set-Scalar
Cloning into '/var/lib/mock/f45-build-26211-616/root/chroot_tmpdir/scmroot/perl-Set-Scalar'...
$ git fetch origin d41d368de0fd7e058d3010bc3f8f1be4132b034b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Set-Scalar
 * [new ref]         d41d368de0fd7e058d3010bc3f8f1be4132b034b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d41d368 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild