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* bug#33171: TMPDIR and build containers
@ 2018-10-27  1:23 pelzflorian (Florian Pelz)
  2018-11-01 15:09 ` Ludovic Courtès
  0 siblings, 1 reply; 2+ messages in thread
From: pelzflorian (Florian Pelz) @ 2018-10-27  1:23 UTC (permalink / raw)
  To: 33171

Hello,

The manual says that TMPDIR does not leak into the build environment:

>    You can influence the directory where the daemon stores build trees
> via the ‘TMPDIR’ environment variable.  However, the build tree within
> the chroot is always called ‘/tmp/guix-build-NAME.drv-0’, where NAME is
> the derivation name—e.g., ‘coreutils-8.24’.  This way, the value of
> ‘TMPDIR’ does not leak inside build environments, which avoids
> discrepancies in cases where build processes capture the name of their
> build tree.


However, later it says:

>    When the daemon performs a build on behalf of the user, it creates a
> build directory under ‘/tmp’ or under the directory specified by its
> ‘TMPDIR’ environment variable; this directory is shared with the
> container for the duration of the build.  Be aware that using a
> directory other than ‘/tmp’ can affect build results—for example, with a
> longer directory name, a build process that uses Unix-domain sockets
> might hit the name length limitation for ‘sun_path’, which it would
> otherwise not hit.


This seems like a contradiction, or do I misunderstand?

Regards,
Florian

^ permalink raw reply	[flat|nested] 2+ messages in thread

* bug#33171: TMPDIR and build containers
  2018-10-27  1:23 bug#33171: TMPDIR and build containers pelzflorian (Florian Pelz)
@ 2018-11-01 15:09 ` Ludovic Courtès
  0 siblings, 0 replies; 2+ messages in thread
From: Ludovic Courtès @ 2018-11-01 15:09 UTC (permalink / raw)
  To: pelzflorian (Florian Pelz); +Cc: 33171-done

Hello Florian,

"pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de> skribis:

> The manual says that TMPDIR does not leak into the build environment:
>
>>    You can influence the directory where the daemon stores build trees
>> via the ‘TMPDIR’ environment variable.  However, the build tree within
>> the chroot is always called ‘/tmp/guix-build-NAME.drv-0’, where NAME is
>> the derivation name—e.g., ‘coreutils-8.24’.  This way, the value of
>> ‘TMPDIR’ does not leak inside build environments, which avoids
>> discrepancies in cases where build processes capture the name of their
>> build tree.
>
>
> However, later it says:
>
>>    When the daemon performs a build on behalf of the user, it creates a
>> build directory under ‘/tmp’ or under the directory specified by its
>> ‘TMPDIR’ environment variable; this directory is shared with the
>> container for the duration of the build.  Be aware that using a
>> directory other than ‘/tmp’ can affect build results—for example, with a
>> longer directory name, a build process that uses Unix-domain sockets
>> might hit the name length limitation for ‘sun_path’, which it would
>> otherwise not hit.
>
>
> This seems like a contradiction, or do I misunderstand?

Indeed.  The sentences that starts with “Be aware” is inaccurate; I’ll
remove it.

Thank you!

Ludo’.

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2018-10-27  1:23 bug#33171: TMPDIR and build containers pelzflorian (Florian Pelz)
2018-11-01 15:09 ` Ludovic Courtès

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