Devuan logs - #468, boring messages

Message sent to [email protected], [email protected]:

Subject: bug#468: python platform.linux_distribution() returns debian
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From: Peter Duffy <[email protected]>
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Date: Thu, 21 May 2020 16:33:35 +0100
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Package: libpython2.7-minimal
Version: 2.7.13

Environment in which bug seen: Devuan 2.1 (ascii)

Problem behaviour: python function platform.linux_distribution() returns
"debian" instead of "devuan"

To reproduce: 

(from command-line):
python

(from python prompt):
import platform
platform.linux_distribution()

(should return: "('debian','9','')"

quit()

Test fix:

platform.linux_distribution() tries to use the file /etc/lsb-release.
This doesn't appear to exist either in Debian stretch or Devuan ascii -
unless it's present in a package which isn't included in the default
install. Creating it with appropriate values fixes the problem:

Check whether /etc/lsb-release exists: it shouldn't, - but if so,
rename it (and rename it back after the test).

lsb_release -a > /etc/lsb-release

Edit /etc/lsb-release and change as follows:

"Distributor ID: " => "DISTRIB_ID="
"Description: " => "DISTRIB_DESCRIPTION="
"Release: "     => "DISTRIB_RELEASE="
"Codename: "    => "DISTRIB_CODENAME="

Above test should now return: "('Devuan','2.1','ascii')"

Additional information:

The problem is apparently caused by the combination of the absence
of /etc/lsb-release, and the presence of /etc/debian_release. The
algorithm in platform.linux_distribution() is apparently to try
reading /etc/lsb-release, and if it doesn't exist, look for any file
matching /etc/*_(version|release)

The bug also exists in python3 (package libpython3.5-minimal, version
3.5.3) - to reproduce, repeat the above test using "python3" instead of
"python"

The bug also exists in beowulf

Not sure whether above "fix" is feasible in practice - maybe other
python-based packages rely on getting back "debian" from
platform.linux_distribution()?

This problem came to light because it breaks the waagent package -
because it believes that it's running on debian, waagent tries to use
systemd-based commands and functions. I'm currently working this
problem, but I'm approaching it by putting in place internal tests to
ascertain whether debian or devuan, rather than relying on a
system-level fix. 

platform.linux_distribution() is deprecated and slated for removal

If it's decided that this can be safely fixed by
creating /etc/lsb-release, one question needs answering: whether to
lowercase the DISTRIB_ID field, or to leave it as returned by
lsb_release

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X-Loop: [email protected]
From: "Devuan bug Tracking System" <[email protected]>
To: [email protected]
Subject: bug#468: Acknowledgement (python platform.linux_distribution()
 returns debian)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack 468
X-Devuan-PR-Package: libpython2.7-minimal
Reply-To: [email protected]
Date: Thu, 21 May 2020 15:48:06 +0000

Thank you for filing a new bug report with Devuan.

You can follow progress on this bug here: 468: https://bugs.devuan.org/cgi/=
bugreport.cgi?bug=3D468.

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468: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D468
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Message sent to [email protected], [email protected]:

Subject: bug#468: python platform.linux_distribution() returns debian
Reply-To: Mark Hindley <[email protected]>, [email protected]
Resent-From: Mark Hindley <[email protected]>
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References: <[email protected]> <[email protected]>
Date: Fri, 22 May 2020 10:45:05 +0100
From: Mark Hindley <[email protected]>
To: [email protected], [email protected]
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Peter,

Thanks for this. It is somewhat problematic for a number of reasons:

 - python2 is EOL.
 
 - as you point out, platform.linux_distribution() is deprecated and slated for
   removal in python3 (presumably for the very reason you have discovered -- it
   isn't reliable).
   
 - In my opinion, applications and functions should use output of lsb_release
   -a directly (as many already do).
   
 - Devuan beowulf deliberately has ID=Debian in lsb_release -a (see the Release
   Notes[1] for an explanation why). This has been changed to ID=Devuan for
   ceres/chimaera.
   
 - neither python2 nor python3 are forked packages and Devuan uses Debian's
   packages directly.
 
Considering all that, I find it difficult to see a feasible route to fixing
this. Having /etc/lsb_release as another source of information only consulted by
some applications seems a retrograde step.

Best wishes,

Mark

[1]  https://files.devuan.org/devuan_beowulf/Release_notes.txt

Message sent to [email protected], [email protected]:

Subject: bug#468: python platform.linux_distribution() returns debian
Reply-To: Mark Hindley <[email protected]>, [email protected]
Resent-From: Mark Hindley <[email protected]>
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Resent-Date: Fri, 22 May 2020 12:03:02 +0000
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References: <[email protected]> <[email protected]> <[email protected]> <[email protected]>
Date: Fri, 22 May 2020 12:49:17 +0100
From: Mark Hindley <[email protected]>
To: Peter Duffy <[email protected]>
Cc: [email protected]
Message-ID: <[email protected]>
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Peter,

On Fri, May 22, 2020 at 12:21:01PM +0100, Peter Duffy wrote:
> Hi Mark,
> 
> Thanks for getting back to me. I agree that this is problematic, and I
> concur with your points and decision not to fix.

I will leave this open, in case any better suggestions come along.

> As I mentioned, I came up against this whilst trying to fix waagent (aka
> walinuxagent and azurelinuxagent) - the glue layer which the Microsoft
> Azure front-end uses to communicate with linux running on VMs. I'm
> trying to set up a virtualbox VM based on devuan ascii, for use as a
> base OS image in Azure. At the moment, waagent detects the system as
> debian instead of devuan, and so tries to use systemd-based utilities
> and functions: of course, these aren't present, so waagent doesn't work
> under devuan. (I'm not sure that it's worth flagging it up as a bug in
> the waagent package? OK, the problem is specific to devuan, but it needs
> to be fixed in waagent.)

Yes, please do.  Let me know if there is anything I can do to help.

It is also worth noting that this approach will sometimes be broken in Debian
too: non-systemd init is still possible in all Debian suites. I suggest it would
be better if they detected init system and acted on that rather than inferred
the init from the distribution. 

> BTW - one point of order. The utility is /usr/bin/lsb_release - the file
> that platform.linux_distribution() tries to use is /etc/lsb-release.
> Don't ask me why :(

Absolutely -- thanks for correcting my lazy typing!

Mark

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From: "Devuan bug Tracking System" <[email protected]>
To: Mark Hindley <[email protected]>
Subject: bug#468: Info received (bug#468: python platform.linux_distribution()
 returns debian)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack-info 468
X-Devuan-PR-Package: libpython2.7-minimal
Reply-To: [email protected]
Date: Fri, 22 May 2020 12:03:04 +0000

Thank you for the additional information you have supplied regarding
this bug report.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

Your message has been sent to the package maintainer(s):
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send it to [email protected].

Please do not send mail to [email protected] unless you wish
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--=20
468: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D468
Devuan Bug Tracking System
Contact [email protected] with problems

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Subject: bug#468: marked as done (python platform.linux_distribution()
 returns debian)
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Date: Tue, 24 Jan 2023 17:20:02 +0000
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has caused the Devuan bug report #468,
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Subject: python platform.linux_distribution() returns debian
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Package: libpython2.7-minimal
Version: 2.7.13

Environment in which bug seen: Devuan 2.1 (ascii)

Problem behaviour: python function platform.linux_distribution() returns
"debian" instead of "devuan"

To reproduce: 

(from command-line):
python

(from python prompt):
import platform
platform.linux_distribution()

(should return: "('debian','9','')"

quit()

Test fix:

platform.linux_distribution() tries to use the file /etc/lsb-release.
This doesn't appear to exist either in Debian stretch or Devuan ascii -
unless it's present in a package which isn't included in the default
install. Creating it with appropriate values fixes the problem:

Check whether /etc/lsb-release exists: it shouldn't, - but if so,
rename it (and rename it back after the test).

lsb_release -a > /etc/lsb-release

Edit /etc/lsb-release and change as follows:

"Distributor ID: " => "DISTRIB_ID="
"Description: " => "DISTRIB_DESCRIPTION="
"Release: "     => "DISTRIB_RELEASE="
"Codename: "    => "DISTRIB_CODENAME="

Above test should now return: "('Devuan','2.1','ascii')"

Additional information:

The problem is apparently caused by the combination of the absence
of /etc/lsb-release, and the presence of /etc/debian_release. The
algorithm in platform.linux_distribution() is apparently to try
reading /etc/lsb-release, and if it doesn't exist, look for any file
matching /etc/*_(version|release)

The bug also exists in python3 (package libpython3.5-minimal, version
3.5.3) - to reproduce, repeat the above test using "python3" instead of
"python"

The bug also exists in beowulf

Not sure whether above "fix" is feasible in practice - maybe other
python-based packages rely on getting back "debian" from
platform.linux_distribution()?

This problem came to light because it breaks the waagent package -
because it believes that it's running on debian, waagent tries to use
systemd-based commands and functions. I'm currently working this
problem, but I'm approaching it by putting in place internal tests to
ascertain whether debian or devuan, rather than relying on a
system-level fix. 

platform.linux_distribution() is deprecated and slated for removal

If it's decided that this can be safely fixed by
creating /etc/lsb-release, one question needs answering: whether to
lowercase the DISTRIB_ID field, or to leave it as returned by
lsb_release

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Date: Tue, 24 Jan 2023 17:17:49 +0000
From: Mark Hindley <[email protected]>
To: [email protected], [email protected]
Subject: Re: bug#468: python platform.linux_distribution() returns debian
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Peter,

I am going to close this as libpython2.7-minimal was removed from Debian[1] and
the python3 platform library doesn't have linux_distribution().

Mark

[1]  https://bugs.debian.org/1027108
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This is an automatic notification regarding your bug report
which was filed against the libpython2.7-minimal package:

#468: python platform.linux_distribution() returns debian

It has been closed by Mark Hindley <[email protected]>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mark Hindley <mark@hin=
dley.org.uk> by
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468: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D468
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From: Mark Hindley <[email protected]>
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Subject: Re: bug#468: python platform.linux_distribution() returns debian
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Peter,

I am going to close this as libpython2.7-minimal was removed from Debian[1] and
the python3 platform library doesn't have linux_distribution().

Mark

[1]  https://bugs.debian.org/1027108
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Subject: python platform.linux_distribution() returns debian
From: Peter Duffy <[email protected]>
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Date: Thu, 21 May 2020 16:33:35 +0100
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Package: libpython2.7-minimal
Version: 2.7.13

Environment in which bug seen: Devuan 2.1 (ascii)

Problem behaviour: python function platform.linux_distribution() returns
"debian" instead of "devuan"

To reproduce: 

(from command-line):
python

(from python prompt):
import platform
platform.linux_distribution()

(should return: "('debian','9','')"

quit()

Test fix:

platform.linux_distribution() tries to use the file /etc/lsb-release.
This doesn't appear to exist either in Debian stretch or Devuan ascii -
unless it's present in a package which isn't included in the default
install. Creating it with appropriate values fixes the problem:

Check whether /etc/lsb-release exists: it shouldn't, - but if so,
rename it (and rename it back after the test).

lsb_release -a > /etc/lsb-release

Edit /etc/lsb-release and change as follows:

"Distributor ID: " => "DISTRIB_ID="
"Description: " => "DISTRIB_DESCRIPTION="
"Release: "     => "DISTRIB_RELEASE="
"Codename: "    => "DISTRIB_CODENAME="

Above test should now return: "('Devuan','2.1','ascii')"

Additional information:

The problem is apparently caused by the combination of the absence
of /etc/lsb-release, and the presence of /etc/debian_release. The
algorithm in platform.linux_distribution() is apparently to try
reading /etc/lsb-release, and if it doesn't exist, look for any file
matching /etc/*_(version|release)

The bug also exists in python3 (package libpython3.5-minimal, version
3.5.3) - to reproduce, repeat the above test using "python3" instead of
"python"

The bug also exists in beowulf

Not sure whether above "fix" is feasible in practice - maybe other
python-based packages rely on getting back "debian" from
platform.linux_distribution()?

This problem came to light because it breaks the waagent package -
because it believes that it's running on debian, waagent tries to use
systemd-based commands and functions. I'm currently working this
problem, but I'm approaching it by putting in place internal tests to
ascertain whether debian or devuan, rather than relying on a
system-level fix. 

platform.linux_distribution() is deprecated and slated for removal

If it's decided that this can be safely fixed by
creating /etc/lsb-release, one question needs answering: whether to
lowercase the DISTRIB_ID field, or to leave it as returned by
lsb_release

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