$ git clone -n https://src.fedoraproject.org/rpms/perl-PerlIO-buffersize.git /var/lib/mock/f45-build-25794-613/root/chroot_tmpdir/scmroot/perl-PerlIO-buffersize
Cloning into '/var/lib/mock/f45-build-25794-613/root/chroot_tmpdir/scmroot/perl-PerlIO-buffersize'...
$ git fetch origin 3875653c6892c849ed9178f8052de9966f898280:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PerlIO-buffersize
 * [new ref]         3875653c6892c849ed9178f8052de9966f898280 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3875653 Perl 5.44 rebuild