$ git clone -n https://src.fedoraproject.org/rpms/perl-bignum.git /var/lib/mock/f41-build-815693-149688/root/chroot_tmpdir/scmroot/perl-bignum
Cloning into '/var/lib/mock/f41-build-815693-149688/root/chroot_tmpdir/scmroot/perl-bignum'...
$ git fetch origin 32ddfe9f2ef22b0d5156036d80c97f95aec34a76:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-bignum
 * [new ref]         32ddfe9f2ef22b0d5156036d80c97f95aec34a76 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 32ddfe9 Increase release to favour standalone package