forked from lix-project/lix
c815aff21b
derivations. This is mostly to simplify the implementation of
nix-prefetch-{url, svn}, which now work properly in setuid
installations.
* Enforce valid store names in `nix-store --add / --add-fixed'.
70 lines
1.6 KiB
Plaintext
70 lines
1.6 KiB
Plaintext
#! @shell@ -e
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url=$1
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expHash=$2
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hashType=$NIX_HASH_ALGO
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if test -z "$hashType"; then
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hashType=md5
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fi
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hashFormat=
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if test "$hashType" != "md5"; then
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hashFormat=--base32
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fi
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if test -z "$url"; then
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echo "syntax: nix-prefetch-url URL [EXPECTED-HASH]" >&2
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exit 1
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fi
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name=$(basename "$url")
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if test -z "$name"; then echo "invalid url"; exit 1; fi
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# If the hash was given, a file with that hash may already be in the
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# store.
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if test -n "$expHash"; then
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finalPath=$(@bindir@/nix-store --print-fixed-path "$hashType" "$expHash" "$name")
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if ! @bindir@/nix-store --check-validity "$finalPath" 2> /dev/null; then
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finalPath=
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fi
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hash=$expHash
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fi
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# If we don't know the hash or a file with that hash doesn't exist,
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# download the file and add it to the store.
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if test -z "$finalPath"; then
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tmpPath=/tmp/nix-prefetch-url-$$ # !!! security?
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tmpFile=$tmpPath/$name
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mkdir $tmpPath
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# Perform the download.
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@curl@ --fail --location --max-redirs 20 "$url" > $tmpFile
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# Compute the hash.
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hash=$(@bindir@/nix-hash --type "$hashType" $hashFormat --flat $tmpFile)
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if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
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# Add the downloaded file to the Nix store.
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finalPath=$(@bindir@/nix-store --add-fixed "$hashType" $tmpFile)
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if test -n "$tmpPath"; then rm -rf $tmpPath || true; fi
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if test -n "$expHash" -a "$expHash" != "$hash"; then
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echo "hash mismatch for URL \`$url'"
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exit 1
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fi
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fi
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if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; 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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