Hi Mark,
Thanks for the thorough analysis.
Mark H Weaver <m...@netris.org> skribis:
> My suspicion is that my kernel (linux-libre-2.6.39.1) and Guix's glibc
> are not playing nicely together. However, Guix's glibc was configured
> to support kernels as early as 2.6.30, and the same 'pwd' executable
> that fails within 'guix-daemon' seems to work outside of it, even when
> run within a chroot.
Could it have something to do with bind mounts?
The method ‘DerivationGoal::initChild()’ in libstore/build.cc is what
sets up the chroot environment. The /tmp/nix-build-* directory is
itself bind-mounted in the chroot.
So:
> * The initial stat(".") syscall reports inode 7274551, which corresponds
> to "/tmp/nix-build-make-boot0-3.82.drv-0/make-3.82", as expected.
>
> * stat("/") reports inode 1073173, which looks WRONG.
>
> * stat("..") reports inode 7274550, which corresponds to
> "/tmp/nix-build-make-boot0-3.82.drv-0", as expected.
>
> * reading the contents of ".." reports inode numbers that all look
> correct, including "make-3.82" with inode 7274551, the same as ".".
> Thus 'pwd' concludes that its result will end with "/make-3.82".
>
> * stat("../..") reports inode 1073174, which looks WRONG.
>
> * reading the contents of "../.." reports inode numbers that all look
> WRONG:
>
> "nix-build-make-boot0-3.82.drv-0" with inode 1073325
> ".." with inode 1073173
> "." with inode 1073174
>
> None of these match the inode of "..", so 'pwd' fails.
Could it be that stat("/") reports the inode of the underlying root?
Can you try this in a REPL (assuming the bootstrap Guile works):
(use-modules (guix store) (guix monads) (guix utils)
(gnu packages bootstrap) (guix packages))
(define (test)
(derivation-expression "test" (%current-system)
'(and
(equal?
(pk 'root (stat:ino (stat "/")))
(pk 'dotdotdotdot (stat:ino (stat "../.."))))
(equal?
(pk 'dotdot (stat:ino (stat "..")))
(pk 'tmp (stat:ino (stat "/tmp"))))
(equal?
(pk 'dot (stat:ino (stat ".")))
(pk 'tmpdir (stat:ino (stat
"/tmp/nix-build-test.drv-0"))))
(mkdir %output))
'()))
(define s (open-connection))
(define drv
(run-with-store s (test)
#:guile-for-build (package-derivation s %bootstrap-guile)))
(build-derivations s drv)
If that test fails, that most likely indicates a bug in Linux-Libre.
BTW, were you able to run (some of) ‘make check’?
Thanks,
Ludo’.
