$ git clone -n https://src.fedoraproject.org/rpms/perl-PDL.git /var/lib/mock/f41-build-816821-150442/root/chroot_tmpdir/scmroot/perl-PDL
Cloning into '/var/lib/mock/f41-build-816821-150442/root/chroot_tmpdir/scmroot/perl-PDL'...
$ git fetch origin b277c00d2ad735666539367af0bcb4d8cd22d918:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PDL
 * [new ref]         b277c00d2ad735666539367af0bcb4d8cd22d918 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b277c00 Perl 5.40 rebuild