‘guix pack -RR’: audit library is dynamically linked

DoneSubmitted by Ludovic Courtès.
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  • Ludovic Courtès
  • Ludovic Courtès
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Ludovic Courtès wrote on 27 Jul 2020 16:04
(address . bug-guix@gnu.org)
87tuxtuk9m.fsf@inria.fr
The audit library created by ‘guix pack -RR’, called ‘pack-audit.so’, isdynamically-linked. Thus, it cannot be loaded (unless there are workinglibgcc.so and libc.so in the search path?), leading to failures likethis:
Toggle snippet (5 lines)$ GUIX_EXECUTION_ENGINE=performance ./bin/sinfo --versionERROR: ld.so: object '/…/lcourtes/tmp/t/gnu/store/0n6nnvzgxyisg0bszb5zqxp2gzdwh7h3-pack-audit.so' cannot be loaded as audit interface: cannot open shared object file; ignored./…/lcourtes/tmp/t/gnu/store/3dhy2f3djmm1h5ix5aa84lrskxzrl6d0-slurm-19.05.3-2/bin//sinfo: error while loading shared libraries: libslurmfull.so: cannot open shared object file: No such file or directory
The root cause is that ‘pack-audit.so’ NEEDs libgcc_s.so, which on thismachine could not be loaded, and thus resolving the other dependenciesof the wrapped executable, like ‘libslurmfull.so’ here, fails.
Ludo’.
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Ludovic Courtès wrote on 28 Jul 2020 14:49
Re: bug#42558: ‘guix pack -RR ’: audit library is dynamically linked
(address . 42558@debbugs.gnu.org)
87r1svu7md.fsf@gnu.org
Ludovic Courtès <ludovic.courtes@inria.fr> skribis:
Toggle quote (13 lines)> The audit library created by ‘guix pack -RR’, called ‘pack-audit.so’, is> dynamically-linked. Thus, it cannot be loaded (unless there are working> libgcc.so and libc.so in the search path?), leading to failures like> this:>> $ GUIX_EXECUTION_ENGINE=performance ./bin/sinfo --version> ERROR: ld.so: object '/…/lcourtes/tmp/t/gnu/store/0n6nnvzgxyisg0bszb5zqxp2gzdwh7h3-pack-audit.so' cannot be loaded as audit interface: cannot open shared object file; ignored.> /…/lcourtes/tmp/t/gnu/store/3dhy2f3djmm1h5ix5aa84lrskxzrl6d0-slurm-19.05.3-2/bin//sinfo: error while loading shared libraries: libslurmfull.so: cannot open shared object file: No such file or directory>> The root cause is that ‘pack-audit.so’ NEEDs libgcc_s.so, which on this> machine could not be loaded, and thus resolving the other dependencies> of the wrapped executable, like ‘libslurmfull.so’ here, fails.
Fixed by commit c6c0d5a22c2ee3d7164dab0129b2e4852a4ae76c.
How could this happen? I think there are two key factors:
1. Most likely I tested v1 of the patch series on “real” non-Guix machines, but when iterating on v2 (which removed ‘--library-path’ from the ld.so invocation¹) I probably relied on ‘tests/guix-pack-relocatable.sh’, which emulates a machine where /gnu is empty by mounting a tmpfs on it.
2. There was another bug in ‘exec_with_loader’ whereby it would symlink its store to that writable /gnu. Thus, the tests would run as if the store was already available under /gnu/store, thereby hiding the actual issue. This second bug is fixed by c088aa2988ef82289c87ebfd6d07d8f1464dd8f0.
AFAICS we’re all fine now.
You’re very welcome to give it a spin on a Guix-less machine! Just do:
guix pack -RR your favorite packages -S /bin=bin
Send the resulting tarball to that machine, and then:
mkdir test cd test tar xf /path/to/pack.tar.gz GUIX_EXECUTION_ENGINE=fakechroot ./bin/your-favorite-command
Ludo’.
¹ https://issues.guix.gnu.org/41189#8
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Ludovic Courtès wrote on 28 Jul 2020 14:49
control message for bug #42558
(address . control@debbugs.gnu.org)
87pn8fu7m4.fsf@gnu.org
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