$ git clone -n https://src.fedoraproject.org/rpms/php-pear-math-biginteger.git /var/lib/mock/f45-build-27972-627/root/chroot_tmpdir/scmroot/php-pear-math-biginteger
Cloning into '/var/lib/mock/f45-build-27972-627/root/chroot_tmpdir/scmroot/php-pear-math-biginteger'...
$ git fetch origin a1b34d175c79923f0f61a7f33bd939650fa57d48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pear-math-biginteger
 * [new ref]         a1b34d175c79923f0f61a7f33bd939650fa57d48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1b34d1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild