I'd like to propose adding a way to declare in snapcraft.yaml that a
folder under SNAP_COMMON (or SNAP_DATA) be created if it does not exist.
Even though interface hooks (future) would seem to support this, it
seems a common case so a simpler solution seems apt.
The particular issue it would solve is auto connecting to a content
interface mount. Currently, one needs to create the SNAP_COMMON/dir
(into which the content is mounted) *before* connecting the interface,
and it is hard to do that when the interface is auto-connected.
Cheers,
kyleN
On 03/02/2017 01:33 PM, knitzsche wrote:
Hi,
I am trying to use the wifi-ap content sharing interface.
It is DENIED (see below) when I try to use a $SNAP directory.
It works when I instead use $SNAP_DATA directory for the content
sharing. But, I have to create that directory at run time: I can't
figure out so far how to create (from snapcraft.yaml) an empty dir in
$SNAP_COMMON or $SNAP_DATA at install time. (Knowing this would solve my
problem.)
To auto connect the interface (via a store snap declaration), I suppose
the directory must be present at install time. So creating the dir at
run time does not seem sufficient for the auto-connect requirement.
Help appreciated.
== Details when trying to use SNAP dir for content sharing:
snapcraft.yaml snippet:
apps:
wifi-ap:
command: bin/wifi-ap
plugs: [control, content]
plugs:
control:
interface: content
content: socket-directory
target: $SNAP/sockets
parts:
controldir:
plugin: dump
source: .
prime:
- sockets
I connect my snap to the interface apparently successfully:
$ sudo snap connect serv:control wifi-ap:control
Verify connection:
$ snap interfaces | grep serv | grep "wifi-ap:"
wifi-ap:control serv
But the bind mount was DENIED:
Mar 02 18:01:02 localhost.localdomain kernel: audit: type=1400
audit(1488477662.292:350110): apparmor="DENIED" operation="mount"
info="failed srcname match" error=-13
profile="/usr/lib/snapd/snap-confine" name="/snap/serv/x3/sockets/"
pid=11461 comm="snap-confine" srcname="/var/snap/wifi-ap/94/sockets/"
flags="rw, bind"
Both wifi-ap snap and my snap seem to have the required directories:
$ ls /var/snap/wifi-ap/94/sockets/
control
knitzsche@localhost:~$ ls /snap/serv/x3/
bin command-run.wrapper command-scan.wrapper command-wifi-ap.wrapper
meta snap sockets
Cheers,
kyleN
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