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2016-05-31daemon: Fix typo....Fixes a regression/typo introduced in
e08380fb6cefd3fd67c3c220a3ddaf385e6413cf.

* nix/libstore/build.cc (DerivationGoal::startBuilder): Canonicalize
"/tmp", not "/tmp/guix-build".
Ludovic Courtès


2016-05-31daemon: rounds: Keep the differing output if -K is given....Regardless of -K, we now also print which output differs.
Eelco Dolstra


2016-05-31daemon: check: Keep the differing output if -K is given....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>
Eelco Dolstra


2016-05-31daemon: check: Fix "failed to produce output path"....This occured when sandbox building is disabled, at least one output
exists, and at least one other output does not.
Eelco Dolstra


2016-05-31daemon: check: Fix assertion failure when some outputs are missing....E.g.

  $ nix-build pkgs/stdenv/linux/ -A stage1.pkgs.perl --check
  nix-store: src/libstore/build.cc:1323: void nix::DerivationGoal::tryToBuild(): Assertion `buildMode != bmCheck || validPaths.size() == drv->outputs.size()' failed.

when perl.out exists but perl.man doesn't. The fix is to only check
the outputs that exist. Note that "nix-build -A stage1.pkgs.all
--check" will still give a (proper) error in this case.
Eelco Dolstra


2016-05-31daemon: When repairing, rebuild if there is no substituter.Eelco Dolstra


2016-05-31daemon: Fix --repair failure on multiple-output derivations....If repair found a corrupted/missing path that depended on a
multiple-output derivation, and some of the outputs of the latter were
not present, it failed with a message like

  error: path ‘/nix/store/cnfn9d5fjys1y93cz9shld2xwaibd7nn-bash-4.3-p42-doc’ is not valid

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Eelco Dolstra


2016-05-31daemon: Handle /tmp being a symlink....* nix/libstore/build.cc (DerivationGoal::startBuilder): Call 'canonPath'
on "/tmp".
Eelco Dolstra