mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-27 08:04:14 +00:00
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.
|
|
{ lib }:
|
|
|
|
# Tested in lib/tests/sources.sh
|
|
let
|
|
inherit (builtins)
|
|
hasContext
|
|
match
|
|
readDir
|
|
split
|
|
storeDir
|
|
tryEval
|
|
;
|
|
inherit (lib)
|
|
boolToString
|
|
filter
|
|
getAttr
|
|
isString
|
|
pathExists
|
|
readFile
|
|
;
|
|
|
|
# Returns the type of a path: regular (for file), symlink, or directory
|
|
pathType = p: getAttr (baseNameOf p) (readDir (dirOf p));
|
|
|
|
# Returns true if the path exists and is a directory, false otherwise
|
|
pathIsDirectory = p: if pathExists p then (pathType p) == "directory" else false;
|
|
|
|
# Returns true if the path exists and is a regular file, false otherwise
|
|
pathIsRegularFile = p: if pathExists p then (pathType p) == "regular" else false;
|
|
|
|
# Bring in a path as a source, filtering out all Subversion and CVS
|
|
# directories, as well as backup files (*~).
|
|
cleanSourceFilter = name: type: let baseName = baseNameOf (toString name); in ! (
|
|
# Filter out version control software files/directories
|
|
(baseName == ".git" || type == "directory" && (baseName == ".svn" || baseName == "CVS" || baseName == ".hg")) ||
|
|
# Filter out editor backup / swap files.
|
|
lib.hasSuffix "~" baseName ||
|
|
match "^\\.sw[a-z]$" baseName != null ||
|
|
match "^\\..*\\.sw[a-z]$" baseName != null ||
|
|
|
|
# Filter out generates files.
|
|
lib.hasSuffix ".o" baseName ||
|
|
lib.hasSuffix ".so" baseName ||
|
|
# Filter out nix-build result symlinks
|
|
(type == "symlink" && lib.hasPrefix "result" baseName) ||
|
|
# Filter out sockets and other types of files we can't have in the store.
|
|
(type == "unknown")
|
|
);
|
|
|
|
# Filters a source tree removing version control files and directories using cleanSourceWith
|
|
#
|
|
# Example:
|
|
# cleanSource ./.
|
|
cleanSource = src: cleanSourceWith { filter = cleanSourceFilter; inherit src; };
|
|
|
|
# Like `builtins.filterSource`, except it will compose with itself,
|
|
# allowing you to chain multiple calls together without any
|
|
# intermediate copies being put in the nix store.
|
|
#
|
|
# lib.cleanSourceWith {
|
|
# filter = f;
|
|
# src = lib.cleanSourceWith {
|
|
# filter = g;
|
|
# src = ./.;
|
|
# };
|
|
# }
|
|
# # Succeeds!
|
|
#
|
|
# builtins.filterSource f (builtins.filterSource g ./.)
|
|
# # Fails!
|
|
#
|
|
# Parameters:
|
|
#
|
|
# src: A path or cleanSourceWith result to filter and/or rename.
|
|
#
|
|
# filter: A function (path -> type -> bool)
|
|
# Optional with default value: constant true (include everything)
|
|
# The function will be combined with the && operator such
|
|
# that src.filter is called lazily.
|
|
# For implementing a filter, see
|
|
# https://nixos.org/nix/manual/#builtin-filterSource
|
|
#
|
|
# name: Optional name to use as part of the store path.
|
|
# This defaults to `src.name` or otherwise `"source"`.
|
|
#
|
|
cleanSourceWith = { filter ? _path: _type: true, src, name ? null }:
|
|
let
|
|
orig = toSourceAttributes src;
|
|
in fromSourceAttributes {
|
|
inherit (orig) origSrc;
|
|
filter = path: type: filter path type && orig.filter path type;
|
|
name = if name != null then name else orig.name;
|
|
};
|
|
|
|
/*
|
|
Add logging to a source, for troubleshooting the filtering behavior.
|
|
Type:
|
|
sources.trace :: sourceLike -> Source
|
|
*/
|
|
trace =
|
|
# Source to debug. The returned source will behave like this source, but also log its filter invocations.
|
|
src:
|
|
let
|
|
attrs = toSourceAttributes src;
|
|
in
|
|
fromSourceAttributes (
|
|
attrs // {
|
|
filter = path: type:
|
|
let
|
|
r = attrs.filter path type;
|
|
in
|
|
builtins.trace "${attrs.name}.filter ${path} = ${boolToString r}" r;
|
|
}
|
|
) // {
|
|
satisfiesSubpathInvariant = src ? satisfiesSubpathInvariant && src.satisfiesSubpathInvariant;
|
|
};
|
|
|
|
# Filter sources by a list of regular expressions.
|
|
#
|
|
# E.g. `src = sourceByRegex ./my-subproject [".*\.py$" "^database.sql$"]`
|
|
sourceByRegex = src: regexes:
|
|
let
|
|
isFiltered = src ? _isLibCleanSourceWith;
|
|
origSrc = if isFiltered then src.origSrc else src;
|
|
in lib.cleanSourceWith {
|
|
filter = (path: type:
|
|
let relPath = lib.removePrefix (toString origSrc + "/") (toString path);
|
|
in lib.any (re: match re relPath != null) regexes);
|
|
inherit src;
|
|
};
|
|
|
|
/*
|
|
Get all files ending with the specified suffices from the given
|
|
source directory or its descendants, omitting files that do not match
|
|
any suffix. The result of the example below will include files like
|
|
`./dir/module.c` and `./dir/subdir/doc.xml` if present.
|
|
|
|
Type: sourceLike -> [String] -> Source
|
|
|
|
Example:
|
|
sourceFilesBySuffices ./. [ ".xml" ".c" ]
|
|
*/
|
|
sourceFilesBySuffices =
|
|
# Path or source containing the files to be returned
|
|
src:
|
|
# A list of file suffix strings
|
|
exts:
|
|
let filter = name: type:
|
|
let base = baseNameOf (toString name);
|
|
in type == "directory" || lib.any (ext: lib.hasSuffix ext base) exts;
|
|
in cleanSourceWith { inherit filter src; };
|
|
|
|
pathIsGitRepo = path: (tryEval (commitIdFromGitRepo path)).success;
|
|
|
|
# Get the commit id of a git repo
|
|
# Example: commitIdFromGitRepo <nixpkgs/.git>
|
|
commitIdFromGitRepo =
|
|
let readCommitFromFile = file: path:
|
|
let fileName = toString path + "/" + file;
|
|
packedRefsName = toString path + "/packed-refs";
|
|
absolutePath = base: path:
|
|
if lib.hasPrefix "/" path
|
|
then path
|
|
else toString (/. + "${base}/${path}");
|
|
in if pathIsRegularFile path
|
|
# Resolve git worktrees. See gitrepository-layout(5)
|
|
then
|
|
let m = match "^gitdir: (.*)$" (lib.fileContents path);
|
|
in if m == null
|
|
then throw ("File contains no gitdir reference: " + path)
|
|
else
|
|
let gitDir = absolutePath (dirOf path) (lib.head m);
|
|
commonDir'' = if pathIsRegularFile "${gitDir}/commondir"
|
|
then lib.fileContents "${gitDir}/commondir"
|
|
else gitDir;
|
|
commonDir' = lib.removeSuffix "/" commonDir'';
|
|
commonDir = absolutePath gitDir commonDir';
|
|
refFile = lib.removePrefix "${commonDir}/" "${gitDir}/${file}";
|
|
in readCommitFromFile refFile commonDir
|
|
|
|
else if pathIsRegularFile fileName
|
|
# Sometimes git stores the commitId directly in the file but
|
|
# sometimes it stores something like: «ref: refs/heads/branch-name»
|
|
then
|
|
let fileContent = lib.fileContents fileName;
|
|
matchRef = match "^ref: (.*)$" fileContent;
|
|
in if matchRef == null
|
|
then fileContent
|
|
else readCommitFromFile (lib.head matchRef) path
|
|
|
|
else if pathIsRegularFile packedRefsName
|
|
# Sometimes, the file isn't there at all and has been packed away in the
|
|
# packed-refs file, so we have to grep through it:
|
|
then
|
|
let fileContent = readFile packedRefsName;
|
|
matchRef = match "([a-z0-9]+) ${file}";
|
|
isRef = s: isString s && (matchRef s) != null;
|
|
# there is a bug in libstdc++ leading to stackoverflow for long strings:
|
|
# https://github.com/NixOS/nix/issues/2147#issuecomment-659868795
|
|
refs = filter isRef (split "\n" fileContent);
|
|
in if refs == []
|
|
then throw ("Could not find " + file + " in " + packedRefsName)
|
|
else lib.head (matchRef (lib.head refs))
|
|
|
|
else throw ("Not a .git directory: " + path);
|
|
in readCommitFromFile "HEAD";
|
|
|
|
pathHasContext = builtins.hasContext or (lib.hasPrefix storeDir);
|
|
|
|
canCleanSource = src: src ? _isLibCleanSourceWith || !(pathHasContext (toString src));
|
|
|
|
# -------------------------------------------------------------------------- #
|
|
# Internal functions
|
|
#
|
|
|
|
# toSourceAttributes : sourceLike -> SourceAttrs
|
|
#
|
|
# Convert any source-like object into a simple, singular representation.
|
|
# We don't expose this representation in order to avoid having a fifth path-
|
|
# like class of objects in the wild.
|
|
# (Existing ones being: paths, strings, sources and x//{outPath})
|
|
# So instead of exposing internals, we build a library of combinator functions.
|
|
toSourceAttributes = src:
|
|
let
|
|
isFiltered = src ? _isLibCleanSourceWith;
|
|
in
|
|
{
|
|
# The original path
|
|
origSrc = if isFiltered then src.origSrc else src;
|
|
filter = if isFiltered then src.filter else _: _: true;
|
|
name = if isFiltered then src.name else "source";
|
|
};
|
|
|
|
# fromSourceAttributes : SourceAttrs -> Source
|
|
#
|
|
# Inverse of toSourceAttributes for Source objects.
|
|
fromSourceAttributes = { origSrc, filter, name }:
|
|
{
|
|
_isLibCleanSourceWith = true;
|
|
inherit origSrc filter name;
|
|
outPath = builtins.path { inherit filter name; path = origSrc; };
|
|
};
|
|
|
|
in {
|
|
inherit
|
|
pathType
|
|
pathIsDirectory
|
|
pathIsRegularFile
|
|
|
|
pathIsGitRepo
|
|
commitIdFromGitRepo
|
|
|
|
cleanSource
|
|
cleanSourceWith
|
|
cleanSourceFilter
|
|
pathHasContext
|
|
canCleanSource
|
|
|
|
sourceByRegex
|
|
sourceFilesBySuffices
|
|
|
|
trace
|
|
;
|
|
}
|