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f446318916
I'm working on a project that involves running a virtual machine monitor program, which creates a control socket in the project directory (because it doesn't make sense to put it anywhere else). This obviously isn't part of the source of my program, so I think cleanSource should filter it out.
266 lines
9.2 KiB
Nix
266 lines
9.2 KiB
Nix
# Functions for copying sources to the Nix store.
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{ lib }:
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# Tested in lib/tests/sources.sh
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let
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inherit (builtins)
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hasContext
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match
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readDir
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split
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storeDir
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tryEval
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;
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inherit (lib)
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boolToString
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filter
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getAttr
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isString
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pathExists
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readFile
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;
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# Returns the type of a path: regular (for file), symlink, or directory
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pathType = p: getAttr (baseNameOf p) (readDir (dirOf p));
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# Returns true if the path exists and is a directory, false otherwise
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pathIsDirectory = p: if pathExists p then (pathType p) == "directory" else false;
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# Returns true if the path exists and is a regular file, false otherwise
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pathIsRegularFile = p: if pathExists p then (pathType p) == "regular" else false;
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# Bring in a path as a source, filtering out all Subversion and CVS
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# directories, as well as backup files (*~).
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cleanSourceFilter = name: type: let baseName = baseNameOf (toString name); in ! (
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# Filter out version control software files/directories
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(baseName == ".git" || type == "directory" && (baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
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# Filter out editor backup / swap files.
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lib.hasSuffix "~" baseName ||
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match "^\\.sw[a-z]$" baseName != null ||
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match "^\\..*\\.sw[a-z]$" baseName != null ||
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# Filter out generates files.
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lib.hasSuffix ".o" baseName ||
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lib.hasSuffix ".so" baseName ||
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# Filter out nix-build result symlinks
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(type == "symlink" && lib.hasPrefix "result" baseName) ||
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# Filter out sockets and other types of files we can't have in the store.
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(type == "unknown")
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);
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# Filters a source tree removing version control files and directories using cleanSourceWith
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#
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# Example:
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# cleanSource ./.
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cleanSource = src: cleanSourceWith { filter = cleanSourceFilter; inherit src; };
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# Like `builtins.filterSource`, except it will compose with itself,
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# allowing you to chain multiple calls together without any
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# intermediate copies being put in the nix store.
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#
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# lib.cleanSourceWith {
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# filter = f;
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# src = lib.cleanSourceWith {
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# filter = g;
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# src = ./.;
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# };
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# }
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# # Succeeds!
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#
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# builtins.filterSource f (builtins.filterSource g ./.)
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# # Fails!
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#
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# Parameters:
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#
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# src: A path or cleanSourceWith result to filter and/or rename.
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#
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# filter: A function (path -> type -> bool)
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# Optional with default value: constant true (include everything)
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# The function will be combined with the && operator such
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# that src.filter is called lazily.
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# For implementing a filter, see
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# https://nixos.org/nix/manual/#builtin-filterSource
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#
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# name: Optional name to use as part of the store path.
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# This defaults to `src.name` or otherwise `"source"`.
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#
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cleanSourceWith = { filter ? _path: _type: true, src, name ? null }:
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let
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orig = toSourceAttributes src;
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in fromSourceAttributes {
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inherit (orig) origSrc;
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filter = path: type: filter path type && orig.filter path type;
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name = if name != null then name else orig.name;
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};
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/*
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Add logging to a source, for troubleshooting the filtering behavior.
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Type:
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sources.trace :: sourceLike -> Source
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*/
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trace =
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# Source to debug. The returned source will behave like this source, but also log its filter invocations.
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src:
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let
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attrs = toSourceAttributes src;
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in
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fromSourceAttributes (
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attrs // {
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filter = path: type:
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let
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r = attrs.filter path type;
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in
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builtins.trace "${attrs.name}.filter ${path} = ${boolToString r}" r;
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}
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) // {
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satisfiesSubpathInvariant = src ? satisfiesSubpathInvariant && src.satisfiesSubpathInvariant;
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};
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# Filter sources by a list of regular expressions.
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#
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# E.g. `src = sourceByRegex ./my-subproject [".*\.py$" "^database.sql$"]`
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sourceByRegex = src: regexes:
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let
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isFiltered = src ? _isLibCleanSourceWith;
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origSrc = if isFiltered then src.origSrc else src;
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in lib.cleanSourceWith {
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filter = (path: type:
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let relPath = lib.removePrefix (toString origSrc + "/") (toString path);
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in lib.any (re: match re relPath != null) regexes);
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inherit src;
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};
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/*
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Get all files ending with the specified suffices from the given
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source directory or its descendants, omitting files that do not match
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any suffix. The result of the example below will include files like
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`./dir/module.c` and `./dir/subdir/doc.xml` if present.
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Type: sourceLike -> [String] -> Source
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Example:
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sourceFilesBySuffices ./. [ ".xml" ".c" ]
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*/
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sourceFilesBySuffices =
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# Path or source containing the files to be returned
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src:
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# A list of file suffix strings
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exts:
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let filter = name: type:
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let base = baseNameOf (toString name);
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in type == "directory" || lib.any (ext: lib.hasSuffix ext base) exts;
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in cleanSourceWith { inherit filter src; };
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pathIsGitRepo = path: (tryEval (commitIdFromGitRepo path)).success;
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# Get the commit id of a git repo
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# Example: commitIdFromGitRepo <nixpkgs/.git>
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commitIdFromGitRepo =
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let readCommitFromFile = file: path:
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let fileName = toString path + "/" + file;
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packedRefsName = toString path + "/packed-refs";
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absolutePath = base: path:
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if lib.hasPrefix "/" path
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then path
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else toString (/. + "${base}/${path}");
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in if pathIsRegularFile path
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# Resolve git worktrees. See gitrepository-layout(5)
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then
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let m = match "^gitdir: (.*)$" (lib.fileContents path);
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in if m == null
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then throw ("File contains no gitdir reference: " + path)
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else
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let gitDir = absolutePath (dirOf path) (lib.head m);
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commonDir'' = if pathIsRegularFile "${gitDir}/commondir"
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then lib.fileContents "${gitDir}/commondir"
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else gitDir;
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commonDir' = lib.removeSuffix "/" commonDir'';
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commonDir = absolutePath gitDir commonDir';
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refFile = lib.removePrefix "${commonDir}/" "${gitDir}/${file}";
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in readCommitFromFile refFile commonDir
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else if pathIsRegularFile fileName
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# Sometimes git stores the commitId directly in the file but
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# sometimes it stores something like: «ref: refs/heads/branch-name»
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then
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let fileContent = lib.fileContents fileName;
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matchRef = match "^ref: (.*)$" fileContent;
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in if matchRef == null
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then fileContent
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else readCommitFromFile (lib.head matchRef) path
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else if pathIsRegularFile packedRefsName
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# Sometimes, the file isn't there at all and has been packed away in the
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# packed-refs file, so we have to grep through it:
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then
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let fileContent = readFile packedRefsName;
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matchRef = match "([a-z0-9]+) ${file}";
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isRef = s: isString s && (matchRef s) != null;
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# there is a bug in libstdc++ leading to stackoverflow for long strings:
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# https://github.com/NixOS/nix/issues/2147#issuecomment-659868795
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refs = filter isRef (split "\n" fileContent);
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in if refs == []
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then throw ("Could not find " + file + " in " + packedRefsName)
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else lib.head (matchRef (lib.head refs))
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else throw ("Not a .git directory: " + path);
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in readCommitFromFile "HEAD";
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pathHasContext = builtins.hasContext or (lib.hasPrefix storeDir);
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canCleanSource = src: src ? _isLibCleanSourceWith || !(pathHasContext (toString src));
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# -------------------------------------------------------------------------- #
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# Internal functions
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#
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# toSourceAttributes : sourceLike -> SourceAttrs
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#
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# Convert any source-like object into a simple, singular representation.
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# We don't expose this representation in order to avoid having a fifth path-
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# like class of objects in the wild.
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# (Existing ones being: paths, strings, sources and x//{outPath})
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# So instead of exposing internals, we build a library of combinator functions.
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toSourceAttributes = src:
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let
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isFiltered = src ? _isLibCleanSourceWith;
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in
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{
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# The original path
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origSrc = if isFiltered then src.origSrc else src;
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filter = if isFiltered then src.filter else _: _: true;
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name = if isFiltered then src.name else "source";
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};
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# fromSourceAttributes : SourceAttrs -> Source
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#
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# Inverse of toSourceAttributes for Source objects.
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fromSourceAttributes = { origSrc, filter, name }:
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{
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_isLibCleanSourceWith = true;
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inherit origSrc filter name;
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outPath = builtins.path { inherit filter name; path = origSrc; };
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};
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in {
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inherit
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pathType
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pathIsDirectory
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pathIsRegularFile
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pathIsGitRepo
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commitIdFromGitRepo
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cleanSource
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cleanSourceWith
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cleanSourceFilter
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pathHasContext
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canCleanSource
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sourceByRegex
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sourceFilesBySuffices
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trace
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;
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}
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