$ git clone -n https://src.fedoraproject.org/rpms/php-doctrine-collections.git /var/lib/mock/f45-build-27846-626/root/chroot_tmpdir/scmroot/php-doctrine-collections
Cloning into '/var/lib/mock/f45-build-27846-626/root/chroot_tmpdir/scmroot/php-doctrine-collections'...
$ git fetch origin 50ec40b7f305b3e03858c2eaa5e245d0a0f453a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/php-doctrine-collections
 * [new ref]         50ec40b7f305b3e03858c2eaa5e245d0a0f453a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50ec40b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild