tvl-depot/tests/substituter.builder.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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Bash

# Set a PATH (!!! impure).
export PATH=/bin:/usr/bin:$PATH
mkdir $out
cat > $out/substituter <<EOF
#! /bin/sh -ex
echo \$*
case \$* in
*aaaa*)
echo "Closure([\"\$2\"],[(\"\$2\",[])])" > \$1
;;
*)
mkdir \$1
echo \$3 \$4 > \$1/hello
;;
esac
EOF
chmod +x $out/substituter