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Re: is dpkg install atomic?

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On Tue, Oct 26, 2021 at 10:31:54AM -0700, Han wrote:
> Hi,
> 
> This might be a dumb question:  is dpkg installing (or updating) a package
> using a .deb file atomic in the event of power outage?
> 
> By atomic, I meant either the new version of the application is fully
> installed, or not at all.  Is this always guaranteed?

No.  A package can be in a "half-installed" state.

unicorn:~$ dpkg -l | head -n3
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)

See where it says "Half-inst" in the middle?  If an "H" is shown in
that column, the package is half-installed.

Also, the post-install scripts that most packages use are shell scripts,
so you already know a priori that the script could be interrupted
partway through.

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Thread

is dpkg install atomic? Han <keepsimple@gmail.com> - 2021-10-26 20:00 +0200
  Re: is dpkg install atomic? Greg Wooledge <greg@wooledge.org> - 2021-10-26 20:00 +0200
  Re: is dpkg install atomic? Roberto C. Sánchez <roberto@debian.org> - 2021-10-26 20:00 +0200
    Re: is dpkg install atomic? Brian <ad44@cityscape.co.uk> - 2021-10-26 20:20 +0200
      Re: is dpkg install atomic? David Wright <deblis@lionunicorn.co.uk> - 2021-10-26 22:10 +0200

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