112ee89501
* 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.
22 lines
330 B
Bash
22 lines
330 B
Bash
# Set a PATH (!!! impure).
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export PATH=/bin:/usr/bin:$PATH
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mkdir $out
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cat > $out/substituter <<EOF
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#! /bin/sh -ex
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echo \$*
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case \$* in
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*aaaa*)
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echo "Closure([\"\$2\"],[(\"\$2\",[])])" > \$1
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;;
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*)
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mkdir \$1
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echo \$3 \$4 > \$1/hello
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;;
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esac
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EOF
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chmod +x $out/substituter
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