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Elpa only serves the latest version of a given package uncompressed. Once that release is no longer the latest & greatest it gets archived and compressed meaning that both the URL and the hash changes. To work around this issue we fall back to the URL with the .lz suffix and if that's the one we downloaded we uncompress the file to ensure the hash matches regardless of compression.
22 lines
665 B
Nix
22 lines
665 B
Nix
# Elpa only serves the latest version of a given package uncompressed.
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# Once that release is no longer the latest & greatest it gets archived and compressed
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# meaning that both the URL and the hash changes.
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#
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# To work around this issue we fall back to the URL with the .lz suffix and if that's the
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# one we downloaded we uncompress the file to ensure the hash matches regardless of compression.
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{ fetchurl, lzip }:
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{ url, ... }@args: fetchurl ((removeAttrs args [ "url" ]) // {
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urls = [
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url
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(url + ".lz")
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];
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postFetch = ''
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if [[ $url == *.lz ]]; then
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${lzip}/bin/lzip -c -d $out > uncompressed
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mv uncompressed $out
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fi
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'';
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})
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