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* Unify the treatment of sources copied to the store, and recursive

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SHA-256 outputs of fixed-output derivations.  I.e. they now produce
  the same store path:

  $ nix-store --add x
  /nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x

  $ nix-store --add-fixed --recursive sha256 x
  /nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x

  the latter being the same as the path that a derivation

    derivation {
      name = "x";
      outputHashAlgo = "sha256";
      outputHashMode = "recursive";
      outputHash = "...";
      ...
    };

  produces.

  This does change the output path for such fixed-output derivations.
  Fortunately they are quite rare.  The most common use is fetchsvn
  calls with SHA-256 hashes.  (There are a handful of those is
  Nixpkgs, mostly unstable development packages.)
  
* Documented the computation of store paths (in store-api.cc).
This commit is contained in:
Eelco Dolstra 2008-12-03 15:06:30 +00:00
parent 09bc0c502c
commit 64519cfd65
12 changed files with 191 additions and 79 deletions
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27
tests/fixed.sh
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@ -34,3 +34,30 @@ clearStore
drvs=$($nixinstantiate fixed.nix -A parallelSame)
echo $drvs
$nixstore -r $drvs -j2
# Fixed-output derivations with a recursive SHA-256 hash should
# produce the same path as "nix-store --add".
echo 'testing sameAsAdd...'
drv=$($nixinstantiate fixed.nix -A sameAsAdd)
echo $drv
out=$($nixstore -r $drv)
echo $out
# This is what fixed.builder2 produces...
rm -rf $TEST_ROOT/fixed
mkdir $TEST_ROOT/fixed
mkdir $TEST_ROOT/fixed/bla
echo "Hello World!" > $TEST_ROOT/fixed/foo
ln -s foo $TEST_ROOT/fixed/bar
out2=$($nixstore --add $TEST_ROOT/fixed)
echo $out2
test "$out" = "$out2" || exit 1
out3=$($nixstore --add-fixed --recursive sha256 $TEST_ROOT/fixed)
echo $out3
test "$out" = "$out3" || exit 1
out4=$($nixstore --print-fixed-path --recursive sha256 "1ixr6yd3297ciyp9im522dfxpqbkhcw0pylkb2aab915278fqaik" fixed)
echo $out4
test "$out" = "$out4" || exit 1