$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-igbinary.git /var/lib/mock/f40-build-733892-105550/root/chroot_tmpdir/scmroot/php-pecl-igbinary
Cloning into '/var/lib/mock/f40-build-733892-105550/root/chroot_tmpdir/scmroot/php-pecl-igbinary'...
$ git fetch origin e32072fd2b93b30fed282c0443f1276ae8aff47f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-igbinary
 * [new ref]         e32072fd2b93b30fed282c0443f1276ae8aff47f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e32072f build out of sources tree