$ git clone -n https://src.fedoraproject.org/rpms/perl-Proc-WaitStat.git /var/lib/mock/f40-build-2239528-53617/root/chroot_tmpdir/scmroot/perl-Proc-WaitStat
Cloning into '/var/lib/mock/f40-build-2239528-53617/root/chroot_tmpdir/scmroot/perl-Proc-WaitStat'...
$ git fetch origin b67361763a6bdc5900aee72076ddecb3b979d216:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Proc-WaitStat
 * [new ref]         b67361763a6bdc5900aee72076ddecb3b979d216 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b673617 Rework spec file