[arch-general] [Bulk] Re: A good time to switch to dash as /bin/sh?

[Florian Pelz]

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On 09/28/2014 07:04 AM, Benjamin A. Shelton wrote:
> On 09/27/2014 02:13 AM, Ralf Mardorf wrote:
>> On Sat, 2014-09-27 at 10:02 +0200, Florian Pelz wrote:
>> 
>>> Same here. With only NoExtract, I linked /bin/sh to dash,
>>> reinstalled bash, and /bin/sh was gone. With both NoExtract and
>>> NoUpgrade, I did the same and /bin/sh was still a link to
>>> dash.
>> My bad, until now I'm using NoExtract for files I don't want to
>> have, I wasn't aware that a file or link we want to have gets
>> lost.
> 
> Okay, so I wasn't *completely* losing my mind (what little of it
> there is!).
> 
> Here's what I think is happening (probably wrong, but this is what
> I've deduced from further reading and some strace fun):
> 
> Since (re)installing over an existing package first removes its 
> constituent files, NoExtract alone results in the reinstallation
> process removing bash (and the /usr/bin/sh link). But, since the
> file is specified as NoExtract, the link/file isn't recreated
> during package extraction (it's skipped). NoUpgrade, on the other
> hand, prevents the file from being removed (reinstallation must
> therefore be considered as an "upgrade" for this purpose) but if
> it's not also specified by NoExtract, it's immediately overwritten
> by the new copy.
> 
> So, if my understanding is correct, this would explain why both
> options must be used in order to keep something relatively
> unscathed. NoUpgrade prevents its removal (or more accurately it
> "prevents its upgrade"); NoExtract prevents it from being
> overwritten.
> 
> Disclaimer: I haven't looked at the pacman sources yet. This is 
> exclusively from observation and what my (admittedly very limited) 
> understanding of pacman provides.
> 
> Benjamin

That makes sense, even if it is not what I would have expected pacman
to do judging from the description in man pacman.conf.

Thank you.
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