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emacs: Add custom elpa fetcher

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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.
This commit is contained in:
adisbladis 2021-08-06 16:25:38 -05:00
parent 3f83a7d988
commit 3c496d2244
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1 changed files with 21 additions and 0 deletions
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pkgs/applications/editors/emacs/elisp-packages/fetchelpa.nix Normal file
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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.
{ fetchurl, lzip }:
{ url, ... }@args: fetchurl ((removeAttrs args [ "url" ]) // {
urls = [
url
(url + ".lz")
];
postFetch = ''
if [[ $url == *.lz ]]; then
${lzip}/bin/lzip -c -d $out > uncompressed
mv uncompressed $out
fi
'';
})