$ git clone -n https://src.fedoraproject.org/rpms/php-pecl-igbinary.git /var/lib/mock/f41-build-side-1-2795253-32718/root/chroot_tmpdir/scmroot/php-pecl-igbinary
Cloning into '/var/lib/mock/f41-build-side-1-2795253-32718/root/chroot_tmpdir/scmroot/php-pecl-igbinary'...
$ git fetch origin cb7302838cfbc449fed9759e5b14e7c315cf6537:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-pecl-igbinary
 * [new ref]         cb7302838cfbc449fed9759e5b14e7c315cf6537 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb73028 update to 3.2.16 (no change)