Hello Antoine, 

ajacou...@bsdfrog.org (Antoine Jacoutot), 2018.11.18 (Sun) 15:31 (CET):
> On Sun, Nov 18, 2018 at 03:09:01PM +0100, Marcus MERIGHI wrote:
> > Hello Antoine, 
> > 
> > thank you for handling gtkam for so long!
> > 
> > ajacou...@bsdfrog.org (Antoine Jacoutot), 2018.11.18 (Sun) 14:48 (CET):
> > > On Sun, Nov 18, 2018 at 01:42:04PM +0100, Marcus MERIGHI wrote:
> > > > at least that was what I had to do: adjust permissions to allow access
> > > > for non-root user. I did not care enough to see if read-only would
> > > > suffice.
> > > 
> > > Well that's not really encouraging for us to commit that diff.
> > 
> > I will try readonly access next time I'm around!
> > 
> > I just thought it would give others a hint - I did not find any help in
> > the package as it is now (maybe insufficient looking?).
> > 
> > > > pkg-readme might be overkill? message better? Both diffs attached.
> > > 
> > > No one reads MESSAGE.
> > 
> > What about the pkg-readme, then?
> 
> Yeah, that's the right place for it.
> If you look at graphics/sane-backends/pkg/README, there's already an example 
> to
> properly change the group of the appropriate ugen device that you could adapt.

Thanks for the hint re. sane-backends!

I went for changing the user, not the group; I only want one user to
access the gadget and figured that's a common case with cameras and
mobile phones.

I added a PLIST entry a la sane-backends, too.

Marcus

Index: graphics/gtkam/pkg/PLIST
===================================================================
RCS file: /cvs/ports/graphics/gtkam/pkg/PLIST,v
retrieving revision 1.13
diff -u -p -u -r1.13 PLIST
--- graphics/gtkam/pkg/PLIST    27 Jun 2018 21:03:54 -0000      1.13
+++ graphics/gtkam/pkg/PLIST    18 Nov 2018 15:47:08 -0000
@@ -55,4 +55,5 @@ share/locale/zh_CN/LC_MESSAGES/gtkam.mo
 share/pixmaps/
 share/pixmaps/gtkam-camera.png
 share/pixmaps/gtkam.png
+share/doc/pkg-readmes/${PKGSTEM}
 @tag update-desktop-database

--- /dev/null   Sun Nov 18 16:37:28 2018
+++ graphics/gtkam/pkg/README   Sun Nov 18 16:37:20 2018
@@ -0,0 +1,32 @@
++-----------------------------------------------------------------------
+| Running ${PKGSTEM} on OpenBSD
++-----------------------------------------------------------------------
+
+Since USB reading of your camera will be handled by libusb, you need to 
+allow the user access to the corresponding USB endpoint. To do so, find
+where your camera is attached to by using:
+    # usbdevs -v
+then change the ownership accordingly.
+
+e.g.
+Controller /dev/usb0:
+addr 01: 8086:0000 Intel, EHCI root hub
+         high speed, self powered, config 1, rev 1.00
+         driver: uhub0
+addr 02: 8087:0024 Intel, Rate Matching Hub
+         high speed, self powered, config 1, rev 0.00
+         driver: uhub3
+addr 03: 04e8:6860 SAMSUNG, SAMSUNG_Android
+         high speed, power 96 mA, config 2, rev 4.00, iSerialNumber 
+           9a0cef4c
+         driver: umodem0
+         driver: ugen0
+
+# chown <username> /dev/ugen0.* /dev/usb0
+
+The reason we are changing the user and not the group is that only 
+<username> can access it. 
+
+To preserve your changes after a system update, use rc.local(8).
+
+Alternatively, hotplugd(8) attach/detach scripts can automate this.
--- /dev/null   Sun Nov 18 16:37:28 2018
+++ graphics/gtkam/pkg/README   Sun Nov 18 16:37:20 2018
@@ -0,0 +1,32 @@
++-----------------------------------------------------------------------
+| Running ${PKGSTEM} on OpenBSD
++-----------------------------------------------------------------------
+
+Since USB reading of your camera will be handled by libusb, you need to 
+allow the user access to the corresponding USB endpoint. To do so, find
+where your camera is attached to by using:
+    # usbdevs -v
+then change the ownership accordingly.
+
+e.g.
+Controller /dev/usb0:
+addr 01: 8086:0000 Intel, EHCI root hub
+         high speed, self powered, config 1, rev 1.00
+         driver: uhub0
+addr 02: 8087:0024 Intel, Rate Matching Hub
+         high speed, self powered, config 1, rev 0.00
+         driver: uhub3
+addr 03: 04e8:6860 SAMSUNG, SAMSUNG_Android
+         high speed, power 96 mA, config 2, rev 4.00, iSerialNumber 
+           9a0cef4c
+         driver: umodem0
+         driver: ugen0
+
+# chown <username> /dev/ugen0.* /dev/usb0
+
+The reason we are changing the user and not the group is that only 
+<username> can access it. 
+
+To preserve your changes after a system update, use rc.local(8).
+
+Alternatively, hotplugd(8) attach/detach scripts can automate this.

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