From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#33171: TMPDIR and build containers
Date: Thu, 01 Nov 2018 16:09:02 +0100
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To: "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>
Cc: 33171-done@debbugs.gnu.org

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 =E2=80=98TMPDIR=E2=80=99 environment variable.  However, the bui=
ld tree within
>> the chroot is always called =E2=80=98/tmp/guix-build-NAME.drv-0=E2=80=99=
, where NAME is
>> the derivation name=E2=80=94e.g., =E2=80=98coreutils-8.24=E2=80=99.  Thi=
s way, the value of
>> =E2=80=98TMPDIR=E2=80=99 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 =E2=80=98/tmp=E2=80=99 or under the directory spec=
ified by its
>> =E2=80=98TMPDIR=E2=80=99 environment variable; this directory is shared =
with the
>> container for the duration of the build.  Be aware that using a
>> directory other than =E2=80=98/tmp=E2=80=99 can affect build results=E2=
=80=94for example, with a
>> longer directory name, a build process that uses Unix-domain sockets
>> might hit the name length limitation for =E2=80=98sun_path=E2=80=99, whi=
ch it would
>> otherwise not hit.
>
>
> This seems like a contradiction, or do I misunderstand?

Indeed.  The sentences that starts with =E2=80=9CBe aware=E2=80=9D is inacc=
urate; I=E2=80=99ll
remove it.

Thank you!

Ludo=E2=80=99.