$ git clone -n https://src.fedoraproject.org/rpms/php-brick-math.git /var/lib/mock/f42-build-side-1-3499040-45964/root/chroot_tmpdir/scmroot/php-brick-math
Cloning into '/var/lib/mock/f42-build-side-1-3499040-45964/root/chroot_tmpdir/scmroot/php-brick-math'...
$ git fetch origin c319d36550b29b05e08b4ea2de524e352d555279:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-brick-math
 * [new ref]         c319d36550b29b05e08b4ea2de524e352d555279 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c319d36 v0.13.1