Bug#771496: overwrites user changes to configuration file /etc/dpkg-cross/cross-compile on upgrade (violates 10.7.3)

gregor herrmann <[email protected]> Sun, 7 Dec 2014 15:22:08 +0100

Newsgroups	gmane.linux.debian.devel.embedded
Message-ID	<20141207142208.GA10024__7018.20478211648$1417962276$gmane$org@jadzia.comodo.priv.at>

Control: tag -1 + confirmed

On Sat, 06 Dec 2014 15:28:39 +0000, Dimitri John Ledkov wrote:

> The user's configuration in this case comes from debconf prompt and
> that choice is preserved upon upgrades, without additional prompts and
> is safe w.r.t. to dpkg prompts.

Yes but it does it wrong.
The .config should read existing values from the file and feed them
into debconf.

C.f. man 7 debconf-devel, section "Config file handling".

> /etc/dpkg-cross/cross-compile.sample on the other-hand is a conffile
> and direct modifications to that file will be preserved and used to
> generate /etc/dpkg-cross/cross-compile file.
> Thus you can edit the .sample file to add other things in that file
> and they will be preserved across upgrades.

This is non-intuitive (why would I edit .sample to change the other
one?) and more importantly it doesn't work because the postinst just
replaces "#*default_arch".

Again, debconf-devel(7) has a nice template for the postinst action.

Cheers,
gregor

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