OK, I found what the problem is:
For pulseaudio to work (or at least paplay), the network plug/interface also
needs to be added.
Snapd 2.0.10+ is also needed.
Without the network plug, running paplay prints these messages to the
journal:
Jul 01 21:02:08 bruno-laptop audit[27684]: SECCOMP auid=4294967295 uid=1000
gid=1000 ses=4294967295 pid=27684 comm="paplay"
exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31 arch=c03e syscall=55
compat=0 ip=0x7fa4b5b3892a code=0x0
Jul 01 21:02:08 bruno-laptop kernel: audit: type=1326 audit(1467403328.239:86):
auid=4294967295 uid=1000 gid=1000 ses=4294967295 pid=27684 comm="paplay"
exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31 arch=c03e syscall=55
compat=0 ip=0x7fa4b5b3892a code=0x0
Adding the network plug fixes this.
So, this needs to be investigated.
The pulseaudio interface also needs some kind of local network access. But
giving it full network and Internet access is not a great idea.
I'll edit the bug description accordingly.
---
"aplay" still doesn't work.
It throws this error:
ALSA lib conf.c:3750:(snd_config_update_r) Cannot access file
/usr/share/alsa/alsa.conf
ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM default
aplay: main:722: audio open error: No such file or directory
I'll report this in another bug.
** Summary changed:
- Can't execute paplay, aplay, etc. even with pulseaudio interface
+ paplay doesn't work without the network interface
** Description changed:
+ Pulseaudio, or at least the "paplay" command, doesn't work without the
+ network plug/interface.
+
+ Running that command inside a snap with the pulseaudio interface prints
+ something like this in the journal:
+
+ Jul 01 21:02:08 bruno-laptop audit[27684]: SECCOMP auid=4294967295 uid=1000
gid=1000 ses=4294967295 pid=27684 comm="paplay"
exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31 arch=c03e syscall=55
compat=0 ip=0x7fa4b5b3892a code=0x0
+ Jul 01 21:02:08 bruno-laptop kernel: audit: type=1326
audit(1467403328.239:86): auid=4294967295 uid=1000 gid=1000 ses=4294967295
pid=27684 comm="paplay" exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31
arch=c03e syscall=55 compat=0 ip=0x7fa4b5b3892a code=0x0
+
+ Note: snapd 2.0.10 or later (which is in xenial-proposed right now) is
+ required to even get this far.
+
+
+ [ORIGINAL DESCRIPTION]
I was packaging a small Racket/Scheme game.
Sound playback doesn't work, even with the pulseaudio interface.
According to
https://docs.racket-lang.org/gui/Windowing_Functions.html#%28def._%28%28lib._mred%2Fmain..rkt%29._play-sound%29%29
, Racket uses the "aplay" command (or others) to play sound, but it isn't
available inside the snap.
I tried bundling the alsa-utils package, but it throws an error when trying
to play a sound.
Maybe the pulseaudio interface should grant access to these commands and
everything else that is required?
** Description changed:
Pulseaudio, or at least the "paplay" command, doesn't work without the
network plug/interface.
Running that command inside a snap with the pulseaudio interface prints
something like this in the journal:
Jul 01 21:02:08 bruno-laptop audit[27684]: SECCOMP auid=4294967295 uid=1000
gid=1000 ses=4294967295 pid=27684 comm="paplay"
exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31 arch=c03e syscall=55
compat=0 ip=0x7fa4b5b3892a code=0x0
Jul 01 21:02:08 bruno-laptop kernel: audit: type=1326
audit(1467403328.239:86): auid=4294967295 uid=1000 gid=1000 ses=4294967295
pid=27684 comm="paplay" exe="/snap/tetris-em-racket/x1/usr/bin/pacat" sig=31
arch=c03e syscall=55 compat=0 ip=0x7fa4b5b3892a code=0x0
- Note: snapd 2.0.10 or later (which is in xenial-proposed right now) is
- required to even get this far.
+ Note: snapd 2.0.10 or later (which is in xenial-proposed right now) is
required to even get this far.
+ The snap also needs to bundle "pulseaudio-utils" for it to work.
[ORIGINAL DESCRIPTION]
I was packaging a small Racket/Scheme game.
Sound playback doesn't work, even with the pulseaudio interface.
According to
https://docs.racket-lang.org/gui/Windowing_Functions.html#%28def._%28%28lib._mred%2Fmain..rkt%29._play-sound%29%29
, Racket uses the "aplay" command (or others) to play sound, but it isn't
available inside the snap.
I tried bundling the alsa-utils package, but it throws an error when trying
to play a sound.
Maybe the pulseaudio interface should grant access to these commands and
everything else that is required?
--
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https://bugs.launchpad.net/bugs/1596717
Title:
paplay doesn't work without the network interface
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