Public bug reported:
We have had a ML discussion about it, but I think it is worth to track
it properly:
I was asking about the preferred way to handle conffiles and such.
There seems to be some new functionality incoming, quoting from the ML:
"> The only snap-centric artifact about it I found was [1]. But that feels
> broken/outdated as there is no "snappy" command anymore (and snap has no
> "config" subcommand).
Something similar will come back. From what I've heard there will be a
apply-config hook which you can implement in your snap and a user can
call from the outside with a simple 'snap set
snap.name.confkey=confvalue' or similar."
But since it seems that for the former there is already work in progress
(although I don't know the bug), there was something related brought up that is
important just as well - and this is what this bug is about.
Quoting Nick Moffit from the Mail:
"Is there a good facility for install-time copying of template configs or
other writeable-from-initial-state data into $SNAP_USER_DATA?
The way snaps are invoked do a great job of hijacking the $*PATH
variables used to find executables and shared objects, but often we need
to hack in a lot of shuffling around for /usr/share and /etc and /var/
to aim them at snappy's special directories."
Currently I see myself and others implement something like "first call
handlers" that copy content packaged in the snap (no reason to be there)
to their intended place (user exposed configuration e.g. in $SNAP_DATA).
I personally would think about something like:
support for that in the copy plugin like supporting:
parts:
defaultconf:
plugin: copy
files:
etc/example.conf: $SNAP_USER_DATA/etc/foo.conf
Surely there is some more magic glue involved as at "snap building time" the
path of $SNAP_USER_DATA and such isn't fix IIRC (could change per setup and in
future).
Therefore I'll file it for snapcraft & snappy right at the beginning.
** Affects: snapcraft
Importance: Undecided
Status: New
** Affects: snappy (Ubuntu)
Importance: Undecided
Status: New
** Also affects: snappy (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1611287
Title:
provide canonical way to install templates and configuration files
into $SNAP_* dirs
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