$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-BigInt-GMP.git /var/lib/mock/f45-build-24671-605/root/chroot_tmpdir/scmroot/perl-Math-BigInt-GMP
Cloning into '/var/lib/mock/f45-build-24671-605/root/chroot_tmpdir/scmroot/perl-Math-BigInt-GMP'...
$ git fetch origin 6218927b7fe071cfde7a9a963111d1b03036937a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-BigInt-GMP
 * [new ref]         6218927b7fe071cfde7a9a963111d1b03036937a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6218927 Perl 5.44 rebuild