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Make sure /dev/pts/ptmx is world-writable

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While running Python 3’s test suite, we noticed that on some systems
/dev/pts/ptmx is created with permissions 0 (that’s the case with my
Nixpkgs-originating 3.0.43 kernel, but someone with a Debian-originating
3.10-3 reported not having this problem.)

There’s still the problem that people without
CONFIG_DEVPTS_MULTIPLE_INSTANCES=y are screwed (as noted in build.cc),
but I don’t see how we could work around it.
This commit is contained in:
Ludovic Courtès 2014-04-02 23:41:11 +02:00 • committed by Eelco Dolstra
parent ac6ceea764
commit e7720aa10a
1 changed files with 4 additions and 0 deletions
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4
src/libstore/build.cc
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@ -2086,6 +2086,10 @@ void DerivationGoal::initChild()
if (mount("none", (chrootRootDir + "/dev/pts").c_str(), "devpts", 0, "newinstance,mode=0620") == -1)
throw SysError("mounting /dev/pts");
createSymlink("/dev/pts/ptmx", chrootRootDir + "/dev/ptmx");
/* Make sure /dev/pts/ptmx is world-writable. With some
Linux versions, it is created with permissions 0. */
chmod_(chrootRootDir + "/dev/pts/ptmx", 0666);
}
/* Do the chroot(). Below we do a chdir() to the