$ git clone -n https://src.fedoraproject.org/rpms/perl-Unix-Statgrab.git /var/lib/mock/f41-build-817031-150576/root/chroot_tmpdir/scmroot/perl-Unix-Statgrab
Cloning into '/var/lib/mock/f41-build-817031-150576/root/chroot_tmpdir/scmroot/perl-Unix-Statgrab'...
$ git fetch origin a05c3f8681e27756aef4a8b974ab75c9e8dfd3c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Unix-Statgrab
 * [new ref]         a05c3f8681e27756aef4a8b974ab75c9e8dfd3c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a05c3f8 Perl 5.40 rebuild