nixpkgs/pkgs/applications/networking/browsers/firefox/update.nix

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{ writeScript
, lib
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, xidel
, common-updater-scripts
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, coreutils
, gnused
, gnugrep
, curl
, attrPath
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, baseUrl ? "http://archive.mozilla.org/pub/firefox/releases/"
, versionSuffix ? ""
, versionKey ? "version"
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}:
writeScript "update-${attrPath}" ''
PATH=${lib.makeBinPath [ common-updater-scripts coreutils curl gnugrep gnused xidel ]}
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url=${baseUrl}
# retriving latest released version
# - extracts all links from the $url
# - extracts lines only with number and dots followed by a slash
# - removes trailing slash
# - sorts everything with semver in mind
# - picks up latest release
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version=`xidel -s $url --extract "//a" | \
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grep "^[0-9.]*${versionSuffix}/$" | \
sed s/[/]$// | \
sort --version-sort | \
tail -n 1`
update-source-version ${attrPath} "$version" "" "" ${versionKey}
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''