Bug#133519: marked as done (x10.postinst script has backwards logic on tty detection, unreachable code.)
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Subject: x10.postinst script has backwards logic on tty detection, unreachable code.
Two shell scripting bugs related to x10.postinst:
Bug 1) I was installing the x10 package for the first time and I encountered the very frustrating situation that the post-install script kept telling me that my serial device "/dev/ttyS0" did not exist, when 'ls' insisted the device node was, in fact, there.
When I investigated, I found that the x10.postinst script has backwards logic on line 31. Since the bug in question is only triggered if the /dev/x10 symlink is not already present, an existing x10 user would be unlikely to run across the problem. :^)
The code reads:
31: if [ -e "$serial" ] ; then
31: echo "$serial does not exist."
34: ln -sf "$serial" /dev/x10 && exit 0
35: echo "Failed to link to $serial to /dev/x10."
Clearly, line 31 was intended to read:
31': if [ ! -e "$serial" ] ; then
A second, but related problem with the script logic also became apparent on inspection: Even if Bug #1 is fixed; If the /dev/x10 link does not already pre-exist when the script is run, (i.e. as is the case on an initial x10 install), then the last block of code (which creates the symlink from /usr/doc/x10 to /usr/share/doc/x10) will not get executed, because of the "exit 0" on the success path on line 34, and so the documentation will not be visible at /usr/doc/x10.
This can be fixed by replacing the 'exit 0' statements on lines 29 and 35 with a less-drastic-but-still-effective 'break' to get out of the input loop. (Using exits in this sort of script is a bad habit anyway, IMHO - makes it harder to tack on extra bits of logic at the end without having to rething the whole script.)
WARNING! This may be a systematic bug in a number of post-install scripts: The final code block has a comment above it that says
# symlink management generated by debstd
I'm not sure exactly what this means: was this changed by a person? an organization? a script that modified a whole slew of post-install scripts to effect a policy change? It smells of auto-generated code, and if so, there may be more scripts out there with the same kind of bug. (i.e. exiting before the final block executes.)
-(-- John V. Martinez
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From: Matej Vela <firstname.lastname@example.org>
X-Katie: $Revision: 1.55 $
Subject: Bug#133519: fixed in x10 1.06-9
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We believe that the bug you reported is fixed in the latest version of
x10, which is due to be installed in the Debian FTP archive:
A summary of the changes between this version and the previous one is
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to firstname.lastname@example.org,
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
Matej Vela <email@example.com> (supplier of updated x10 package)
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-----BEGIN PGP SIGNED MESSAGE-----
Date: Tue, 26 Apr 2005 14:23:12 +0200
Architecture: source i386
Maintainer: Debian QA Group <email@example.com>
Changed-By: Matej Vela <firstname.lastname@example.org>
x10 - Operate X-10 electrical power control modules
Closes: 133519 294417
x10 (1.06-9) unstable; urgency=low
* QA upload.
* Fix symlink creation logic. Closes: #133519.
* Prompt via debconf. Closes: #294417.
* debian/postrm: Remove /dev/x10 on purge.
* debian/README.debian: Fold into debian/copyright.
4351ce8188f546acb60c6011fd42a5b5 544 electronics optional x10_1.06-9.dsc
d87716c0341ab2d0be96c67956343695 7103 electronics optional x10_1.06-9.diff.gz
4c74d078f5ed7bd5557383747fc8dd3c 20952 electronics optional x10_1.06-9_i386.deb
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