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daemon: check: Keep the differing output if -K is given.

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This makes it easier to investigate the non-determinism, e.g.

  $ nix-build pkgs/stdenv/linux -A stage1.pkgs.zlib --check -K
  error: derivation ‘/nix/store/l54i8wlw22656i4pk05c52ngv9rpl39q-zlib-1.2.8.drv’ may not be deterministic: output ‘/nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8’ differs from ‘/nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8-check’

  $ diffoscope /nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8 /nix/store/11a27shh6n2ivi4a7s964i65ql80cf27-zlib-1.2.8-check
  ...
  ├── lib/libz.a
  │   ├── metadata
  │   │ @@ -1,15 +1,15 @@
  │   │ -rw-r--r-- 30001/30000   3096 Jan 12 15:20 2016 adler32.o
  ...
  │   │ +rw-r--r-- 30001/30000   3096 Jan 12 15:28 2016 adler32.o
  ...

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Eelco Dolstra 2016-01-12 16:44:26 +01:00 committed by Ludovic Courtès
parent 7889e72dad
commit 7f3b2510d6
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2 changed files with 16 additions and 2 deletions
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4
doc/guix.texi
View file

@ -4332,6 +4332,10 @@ substitutes are genuine (@pxref{Substitutes}), or whether the build result
of a package is deterministic. @xref{Invoking guix challenge}, for more
background information and tools.
When used in conjunction with @option{--keep-failed}, the differing
output is kept in the store, under @file{/gnu/store/@dots{}-check}.
This makes it easy to look for differences between the two results.
@item --derivations
@itemx -d
Return the derivation paths, not the output paths, of the given

14
nix/libstore/build.cc
View file

@ -2431,8 +2431,18 @@ void DerivationGoal::registerOutputs()
if (buildMode == bmCheck) {
if (!store->isValidPath(path)) continue;
ValidPathInfo info = worker.store.queryPathInfo(path);
if (hash.first != info.hash)
throw Error(format("derivation `%1%' may not be deterministic: hash mismatch in output `%2%'") % drvPath % path);
if (hash.first != info.hash) {
if (settings.keepFailed) {
Path dst = path + "-check";
if (pathExists(dst)) deletePath(dst);
if (rename(actualPath.c_str(), dst.c_str()))
throw SysError(format("renaming `%1%' to `%2%'") % actualPath % dst);
throw Error(format("derivation `%1%' may not be deterministic: output `%2%' differs from ‘%3%’")
% drvPath % path % dst);
} else
throw Error(format("derivation `%1%' may not be deterministic: output `%2%' differs")
% drvPath % path);
}
continue;
}