tvl-depot/tests/substitutes.sh
Eelco Dolstra 112ee89501 * Re-enable support for substitutes in the normaliser.
* A better substitute mechanism.

  Instead of generating a store expression for each store path for
  which we have a substitute, we can have a single store expression
  that builds a generic program that is invoked to build the desired
  store path, which is passed as an argument.

  This means that operations like `nix-pull' only produce O(1) files
  instead of O(N) files in the store when registering N substitutes.
  (It consumes O(N) database storage, of course, but that's not a
  performance problem).

* Added a test for the substitute mechanism.
  
* `nix-store --substitute' reads the substitutes from standard input,
  instead of from the command line.  This prevents us from running
  into the kernel's limit on command line length.
2004-06-20 19:17:54 +00:00

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# Instantiate.
storeExpr=$($TOP/src/nix-instantiate/nix-instantiate substitutes.nix)
echo "store expr is $storeExpr"
# Find the output path.
outPath=$($TOP/src/nix-store/nix-store -qvvvvv "$storeExpr")
echo "output path is $outPath"
# Instantiate the substitute program.
subExpr=$($TOP/src/nix-instantiate/nix-instantiate substituter.nix)
echo "store expr is $subExpr"
# Register a fake successor, and a substitute for it.
suc=$NIX_STORE_DIR/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-s.store
(echo $suc && echo $subExpr && echo "/substituter" && echo 3 && echo $outPath && echo Hallo && echo Wereld) | $TOP/src/nix-store/nix-store --substitute
$TOP/src/nix-store/nix-store --successor $storeExpr $suc
# Register a substitute for the output path.
(echo $outPath && echo $subExpr && echo "/substituter" && echo 3 && echo $outPath && echo Hallo && echo Wereld) | $TOP/src/nix-store/nix-store --substitute
$TOP/src/nix-store/nix-store -rvvvvv "$storeExpr"
text=$(cat "$outPath"/hello)
if test "$text" != "Hallo Wereld"; then exit 1; fi