mirror of
https://github.com/privatevoid-net/nix-super.git
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60 lines
1.6 KiB
Text
60 lines
1.6 KiB
Text
#! @shell@ -e
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url=$1
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hash=$2
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if test -z "$url"; then
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echo "syntax: nix-prefetch-url URL" >&2
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exit 1
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fi
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# Determine the hash, unless it was given.
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if test -z "$hash"; then
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# !!! race
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tmpPath1=@storedir@/nix-prefetch-url-$$
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# Test whether we have write permission in the store. If not,
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# fetch to /tmp and don't copy to the store. This is a hack to
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# make this script at least work somewhat in setuid installations.
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if ! touch $tmpPath1 2> /dev/null; then
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echo "(cannot write to the store, result won't be cached)" >&2
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dummyMode=1
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tmpPath1=/tmp/nix-prefetch-url-$$ # !!! security?
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fi
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# Perform the checkout.
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@curl@ --fail --location --max-redirs 20 "$url" > $tmpPath1
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# Compute the hash.
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hash=$(@bindir@/nix-hash --flat $tmpPath1)
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if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
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# Rename it so that the fetchurl builder can find it.
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if test "$dummyMode" != 1; then
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tmpPath2=@storedir@/nix-prefetch-url-$hash
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test -e $tmpPath2 || mv $tmpPath1 $tmpPath2 # !!! race
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fi
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fi
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# Create a Nix expression that does a fetchurl.
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storeExpr=$( \
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echo "(import @datadir@/nix/corepkgs/fetchurl) \
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{url = $url; md5 = \"$hash\"; system = \"@system@\";}" \
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| @bindir@/nix-instantiate -)
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# Realise it.
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finalPath=$(@bindir@/nix-store -qnB --force-realise $storeExpr)
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if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
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if test -n "$tmpPath1" -o -n "$tmpPath2"; then
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rm -rf $tmpPath1 $tmpPath2 || true
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fi
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echo $hash
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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