$ git clone -n https://src.fedoraproject.org/rpms/pcmanfm.git /var/lib/mock/f39-build-1560152-37332/root/chroot_tmpdir/scmroot/pcmanfm
Cloning into '/var/lib/mock/f39-build-1560152-37332/root/chroot_tmpdir/scmroot/pcmanfm'...
$ git fetch origin c8046fb638bf165a8d39a9bc79551db0a6424b0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcmanfm
 * [new ref]         c8046fb638bf165a8d39a9bc79551db0a6424b0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8046fb Update to the latest git