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