$ git clone -n https://src.fedoraproject.org/rpms/perl-PadWalker.git /var/lib/mock/f43-perl-60950022-6586679/root/chroot_tmpdir/scmroot/perl-PadWalker
Cloning into '/var/lib/mock/f43-perl-60950022-6586679/root/chroot_tmpdir/scmroot/perl-PadWalker'...
$ git fetch origin 895c2d4063e012c0b5eaad84db23559fcdf3e18f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PadWalker
 * [new ref]         895c2d4063e012c0b5eaad84db23559fcdf3e18f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 895c2d4 Perl 5.42 rebuild