$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-BigInt-FastCalc.git /var/lib/mock/f41-build-817459-150784/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc
Cloning into '/var/lib/mock/f41-build-817459-150784/root/chroot_tmpdir/scmroot/perl-Math-BigInt-FastCalc'...
$ git fetch origin 5c304231a8a2b0f80d8db31eb15f002f77bf629a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-BigInt-FastCalc
 * [new ref]         5c304231a8a2b0f80d8db31eb15f002f77bf629a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c30423 Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild