$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-LibIDN2.git /var/lib/mock/f45-build-25332-610/root/chroot_tmpdir/scmroot/perl-Net-LibIDN2
Cloning into '/var/lib/mock/f45-build-25332-610/root/chroot_tmpdir/scmroot/perl-Net-LibIDN2'...
$ git fetch origin 54b140982417bfbb1b150e491db3eb5dd5818985:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-LibIDN2
 * [new ref]         54b140982417bfbb1b150e491db3eb5dd5818985 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54b1409 Perl 5.44 rebuild