$ git clone -n https://src.fedoraproject.org/rpms/perl-PDF-Builder.git /var/lib/mock/f40-build-2266917-54661/root/chroot_tmpdir/scmroot/perl-PDF-Builder
Cloning into '/var/lib/mock/f40-build-2266917-54661/root/chroot_tmpdir/scmroot/perl-PDF-Builder'...
$ git fetch origin 62d0dc92c4505c7aa966d24316de746660ddb4f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PDF-Builder
 * [new ref]         62d0dc92c4505c7aa966d24316de746660ddb4f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62d0dc9 3.026 bump