$ git clone -n https://src.fedoraproject.org/rpms/php-guzzlehttp-psr7.git /var/lib/mock/f42-build-3406864-45143/root/chroot_tmpdir/scmroot/php-guzzlehttp-psr7
Cloning into '/var/lib/mock/f42-build-3406864-45143/root/chroot_tmpdir/scmroot/php-guzzlehttp-psr7'...
$ git fetch origin 05f9fef8adc300079c39c4b62440eb7693c3407a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-guzzlehttp-psr7
 * [new ref]         05f9fef8adc300079c39c4b62440eb7693c3407a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05f9fef Orphaned for 6+ weeks