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lib.path.hasStorePathPrefix: init
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
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parent
c4e2e52a21
commit
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@ -9,6 +9,7 @@ let
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split
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match
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typeOf
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storeDir
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;
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inherit (lib.lists)
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@ -24,6 +25,8 @@ let
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drop
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;
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listHasPrefix = lib.lists.hasPrefix;
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inherit (lib.strings)
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concatStringsSep
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substring
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@ -120,6 +123,28 @@ let
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else recurse ([ (baseNameOf base) ] ++ components) (dirOf base);
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in recurse [];
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# The components of the store directory, typically [ "nix" "store" ]
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storeDirComponents = splitRelPath ("./" + storeDir);
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# The number of store directory components, typically 2
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storeDirLength = length storeDirComponents;
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# Type: [ String ] -> Bool
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#
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# Whether path components have a store path as a prefix, according to
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# https://nixos.org/manual/nix/stable/store/store-path.html#store-path.
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componentsHaveStorePathPrefix = components:
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# path starts with the store directory (typically /nix/store)
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listHasPrefix storeDirComponents components
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# is not the store directory itself, meaning there's at least one extra component
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&& storeDirComponents != components
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# and the first component after the store directory has the expected format.
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# NOTE: We could change the hash regex to be [0-9a-df-np-sv-z],
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# because these are the actual ASCII characters used by Nix's base32 implementation,
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# but this is not fully specified, so let's tie this too much to the currently implemented concept of store paths.
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# Similar reasoning applies to the validity of the name part.
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# We care more about discerning store path-ness on realistic values. Making it airtight would be fragile and slow.
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&& match ".{32}-.+" (elemAt components storeDirLength) != null;
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in /* No rec! Add dependencies on this file at the top. */ {
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/*
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@ -321,6 +346,62 @@ in /* No rec! Add dependencies on this file at the top. */ {
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subpath = joinRelPath deconstructed.components;
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};
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/*
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Whether a [path](https://nixos.org/manual/nix/stable/language/values.html#type-path)
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has a [store path](https://nixos.org/manual/nix/stable/store/store-path.html#store-path)
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as a prefix.
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:::{.note}
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As with all functions of this `lib.path` library, it does not work on paths in strings,
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which is how you'd typically get store paths.
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Instead, this function only handles path values themselves,
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which occur when Nix files in the store use relative path expressions.
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:::
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Type:
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hasStorePathPrefix :: Path -> Bool
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Example:
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# Subpaths of derivation outputs have a store path as a prefix
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hasStorePathPrefix /nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo/bar/baz
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=> true
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# The store directory itself is not a store path
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hasStorePathPrefix /nix/store
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=> false
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# Derivation outputs are store paths themselves
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hasStorePathPrefix /nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo
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=> true
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# Paths outside the Nix store don't have a store path prefix
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hasStorePathPrefix /home/user
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=> false
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# Not all paths under the Nix store are store paths
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hasStorePathPrefix /nix/store/.links/10gg8k3rmbw8p7gszarbk7qyd9jwxhcfq9i6s5i0qikx8alkk4hq
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=> false
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# Store derivations are also store paths themselves
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hasStorePathPrefix /nix/store/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo.drv
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=> true
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*/
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hasStorePathPrefix = path:
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let
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deconstructed = deconstructPath path;
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in
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assert assertMsg
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(isPath path)
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"lib.path.hasStorePathPrefix: Argument is of type ${typeOf path}, but a path was expected";
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assert assertMsg
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# This function likely breaks or needs adjustment if used with other filesystem roots, if they ever get implemented.
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# Let's try to error nicely in such a case, though it's unclear how an implementation would work even and whether this could be detected.
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# See also https://github.com/NixOS/nix/pull/6530#discussion_r1422843117
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(deconstructed.root == /. && toString deconstructed.root == "/")
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"lib.path.hasStorePathPrefix: Argument has a filesystem root (${toString deconstructed.root}) that's not /, which is currently not supported.";
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componentsHaveStorePathPrefix deconstructed.components;
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/*
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Whether a value is a valid subpath string.
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@ -3,7 +3,10 @@
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{ libpath }:
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let
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lib = import libpath;
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inherit (lib.path) hasPrefix removePrefix append splitRoot subpath;
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inherit (lib.path) hasPrefix removePrefix append splitRoot hasStorePathPrefix subpath;
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# This is not allowed generally, but we're in the tests here, so we'll allow ourselves.
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storeDirPath = /. + builtins.storeDir;
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cases = lib.runTests {
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# Test examples from the lib.path.append documentation
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@ -91,6 +94,31 @@ let
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expected = false;
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};
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testHasStorePathPrefixExample1 = {
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expr = hasStorePathPrefix (storeDirPath + "/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo/bar/baz");
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expected = true;
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};
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testHasStorePathPrefixExample2 = {
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expr = hasStorePathPrefix storeDirPath;
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expected = false;
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};
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testHasStorePathPrefixExample3 = {
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expr = hasStorePathPrefix (storeDirPath + "/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo");
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expected = true;
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};
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testHasStorePathPrefixExample4 = {
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expr = hasStorePathPrefix /home/user;
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expected = false;
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};
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testHasStorePathPrefixExample5 = {
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expr = hasStorePathPrefix (storeDirPath + "/.links/10gg8k3rmbw8p7gszarbk7qyd9jwxhcfq9i6s5i0qikx8alkk4hq");
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expected = false;
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};
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testHasStorePathPrefixExample6 = {
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expr = hasStorePathPrefix (storeDirPath + "/nvl9ic0pj1fpyln3zaqrf4cclbqdfn1j-foo.drv");
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expected = true;
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};
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# Test examples from the lib.path.subpath.isValid documentation
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testSubpathIsValidExample1 = {
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expr = subpath.isValid null;
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