119 lines
4.2 KiB
Text
119 lines
4.2 KiB
Text
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update-walker is an imperative semiautomated update helper.
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It runs the X.upstream file to find the freshest version of the package in
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the specified upstream source and updates the corresponding X.nix file.
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The simplest available commands:
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url: set the upstream source list URL equal to $1; the default is
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meta.downloadPage with meta.homepage fallback
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dl_url_re: set the regular expression used to select download links to $1; the
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default is meta.downloadURLRegexp or '[.]tar[.]([^./])+\$' if it is not set
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target: specify target expression; default is to replace .upstream extension
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with .nix extension
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name: specify the derivation name; default is the basename of the dirname
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of the .upstream file
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attribute_name: specify the attribute name to evaluate for getting the current
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version from meta.version; default is to use the derivation name
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minimize_overwrite: set config options that mean that only version= and
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sha256= have to be replaced; the default is to regenerate a full upstream
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description block with url, name, version, hash etc.
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A lot of packages can be updated in a pseudo-declarative style using only
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the commands from the previous paragraph.
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Some packages do not need any non-default settings, in these case just setting
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meta.updateWalker to true is enough, you can run update-walker directly on the
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.nix file afterwards. In this case minimize_overwrite it implied unless
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meta.fullRegenerate is set.
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The packages that require more fine-grained control than the described options
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allow, you need to take into account the default control flow of the tool.
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First, the definitions from update-walker script and additional definitions
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from update-walker-service-specific.sh are loaded. Then the config is executed
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as a shell script. Some of the commands it can use do remember whether they
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have been used. Afterwards the following steps happen:
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attribute_name is set to name unless it has been already set
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meta.version is read from the NixPkgs package called attribute_name
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download URL regexp is set to default unless it has been already set in the
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updater script
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the download page URL gets set to default value unless it has been set
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previously
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if the action of getting the download page and choosing the freshest link by
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version has not yet been taken, it happens
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if the version has not yet been extracted from the URL, it gets extracted
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target nix expression to update gets set to the default value unless it has
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been set explicitly
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if the URL version is fresher than the packaged version, the new file gets
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downloaded and its hash is calculated
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do_overwrite function is called; the default calculates a big upstream data
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block and puts it after the '# Generated upstream information' marker (the
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marker can be changed by the command marker)
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If the update needs some special logic, it is put into the updater script and
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the corresponding steps are skipped because the needed action has already been
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performed.
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For example:
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minimize_overwrite is exactly the same as
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do_overwrite() { do_overwrite_just_version; }
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redefinition. You can do a more complex do_overwrite redifinition, if needed.
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It can probably use ensure_hash to download the source and calculate the hash
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and set_var_value.
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set_var_value alters the $3-th instance of assigning the $1 name in the
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expression to the value $2. $3 defaults to 1. It can modify $4 instead of the
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current target, it can put the value without quotes if $5 is 1.
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Typical steps include:
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ensure_choice: download current URL and find the freshest version link on the
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page, it is now the new URL
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ensure_hash: download current URL and calculate the source package hash
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ensure_version: extract version from the URL
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SF_redirect: replace the current URL with a SourceForge.net mirror:// URL
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SF_version_dir: assume SourceForge.net layout and choose the freshest
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version-named subdirectory in the file catalog; you can optionally specify $1
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as a directory name regexp (digits and periods will be required after it)
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SF_version_tarball: assume SourceForge.net layout and choose the freshest
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tarball download link
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version: apply replacement of $1 with $2 (extended regexp format) to extract
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the version from URL
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version_link: choose the freshest versioned link, $1 is the regexp of
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acceptable links
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