$ git clone -n https://src.fedoraproject.org/rpms/pjproject.git /var/lib/mock/f40-build-2223783-52756/root/chroot_tmpdir/scmroot/pjproject
Cloning into '/var/lib/mock/f40-build-2223783-52756/root/chroot_tmpdir/scmroot/pjproject'...
$ git fetch origin 54eb5d1d884cfed0c9f2044574be9782250d4a45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pjproject
 * [new ref]         54eb5d1d884cfed0c9f2044574be9782250d4a45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54eb5d1 Update to version 2.13.1