104 lines
4.3 KiB
Nix
104 lines
4.3 KiB
Nix
# Functions for copying sources to the Nix store.
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{ lib }:
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rec {
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# Returns the type of a path: regular (for file), symlink, or directory
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pathType = p: with builtins; 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 builtins.pathExists p then (pathType p) == "directory" 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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builtins.match "^\\.sw[a-z]$" baseName != null ||
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builtins.match "^\\..*\\.sw[a-z]$" 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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);
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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 f (lib.cleanSourceWith g ./.) # Succeeds!
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# builtins.filterSource f (builtins.filterSource g ./.) # Fails!
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cleanSourceWith = { filter, src }:
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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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filter' = if isFiltered then name: type: filter name type && src.filter name type else filter;
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in {
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inherit origSrc;
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filter = filter';
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outPath = builtins.filterSource filter' origSrc;
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_isLibCleanSourceWith = true;
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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: cleanSourceWith {
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filter = (path: type:
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let relPath = lib.removePrefix (toString src + "/") (toString path);
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in lib.any (re: builtins.match re relPath != null) regexes);
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inherit src;
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};
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# Get all files ending with the specified suffices from the given
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# directory or its descendants. E.g. `sourceFilesBySuffices ./dir
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# [".xml" ".c"]'.
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sourceFilesBySuffices = path: 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 = path; };
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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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with builtins;
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let fileName = toString path + "/" + file;
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packedRefsName = toString path + "/packed-refs";
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in if lib.pathExists fileName
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then
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let fileContent = lib.fileContents 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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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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# 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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else if lib.pathExists packedRefsName
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then
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let fileContent = readFile packedRefsName;
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matchRef = match (".*\n([^\n ]*) " + file + "\n.*") fileContent;
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in if matchRef == null
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then throw ("Could not find " + file + " in " + packedRefsName)
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else lib.head matchRef
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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 builtins.storeDir);
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canCleanSource = src: src ? _isLibCleanSourceWith || !(pathHasContext (toString src));
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}
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