Merge pull request #234070 from tweag/pathType-tests

Init `nixVersions.minimum` and fix `lib` tests for all Nix versions

lib/tests/filesystem.sh

@@ -35,58 +35,50 @@ touch regular
 ln -s target symlink
 mkfifo fifo
 
-checkPathType() {
-    local path=$1
-    local expectedPathType=$2
-    local actualPathType=$(nix-instantiate --eval --strict --json 2>&1 \
-        -E '{ path }: let lib = import <nixpkgs/lib>; in lib.filesystem.pathType path' \
-        --argstr path "$path")
-    if [[ "$actualPathType" != "$expectedPathType" ]]; then
-        die "lib.filesystem.pathType \"$path\" == $actualPathType, but $expectedPathType was expected"
+expectSuccess() {
+    local expr=$1
+    local expectedResultRegex=$2
+    if ! result=$(nix-instantiate --eval --strict --json \
+        --expr "with (import <nixpkgs/lib>).filesystem; $expr"); then
+        die "$expr failed to evaluate, but it was expected to succeed"
+    fi
+    if [[ ! "$result" =~ $expectedResultRegex ]]; then
+        die "$expr == $result, but $expectedResultRegex was expected"
     fi
 }
 
-checkPathType "/" '"directory"'
-checkPathType "$PWD/directory" '"directory"'
-checkPathType "$PWD/regular" '"regular"'
-checkPathType "$PWD/symlink" '"symlink"'
-checkPathType "$PWD/fifo" '"unknown"'
-checkPathType "$PWD/non-existent" "error: evaluation aborted with the following error message: 'lib.filesystem.pathType: Path $PWD/non-existent does not exist.'"
-
-checkPathIsDirectory() {
-    local path=$1
-    local expectedIsDirectory=$2
-    local actualIsDirectory=$(nix-instantiate --eval --strict --json 2>&1 \
-        -E '{ path }: let lib = import <nixpkgs/lib>; in lib.filesystem.pathIsDirectory path' \
-        --argstr path "$path")
-    if [[ "$actualIsDirectory" != "$expectedIsDirectory" ]]; then
-        die "lib.filesystem.pathIsDirectory \"$path\" == $actualIsDirectory, but $expectedIsDirectory was expected"
+expectFailure() {
+    local expr=$1
+    local expectedErrorRegex=$2
+    if result=$(nix-instantiate --eval --strict --json 2>"$work/stderr" \
+        --expr "with (import <nixpkgs/lib>).filesystem; $expr"); then
+        die "$expr evaluated successfully to $result, but it was expected to fail"
+    fi
+    if [[ ! "$(<"$work/stderr")" =~ $expectedErrorRegex ]]; then
+        die "Error was $(<"$work/stderr"), but $expectedErrorRegex was expected"
     fi
 }
 
-checkPathIsDirectory "/" "true"
-checkPathIsDirectory "$PWD/directory" "true"
-checkPathIsDirectory "$PWD/regular" "false"
-checkPathIsDirectory "$PWD/symlink" "false"
-checkPathIsDirectory "$PWD/fifo" "false"
-checkPathIsDirectory "$PWD/non-existent" "false"
+expectSuccess "pathType /." '"directory"'
+expectSuccess "pathType $PWD/directory" '"directory"'
+expectSuccess "pathType $PWD/regular" '"regular"'
+expectSuccess "pathType $PWD/symlink" '"symlink"'
+expectSuccess "pathType $PWD/fifo" '"unknown"'
+# Different errors depending on whether the builtins.readFilePath primop is available or not
+expectFailure "pathType $PWD/non-existent" "error: (evaluation aborted with the following error message: 'lib.filesystem.pathType: Path $PWD/non-existent does not exist.'|getting status of '$PWD/non-existent': No such file or directory)"
 
-checkPathIsRegularFile() {
-    local path=$1
-    local expectedIsRegularFile=$2
-    local actualIsRegularFile=$(nix-instantiate --eval --strict --json 2>&1 \
-        -E '{ path }: let lib = import <nixpkgs/lib>; in lib.filesystem.pathIsRegularFile path' \
-        --argstr path "$path")
-    if [[ "$actualIsRegularFile" != "$expectedIsRegularFile" ]]; then
-        die "lib.filesystem.pathIsRegularFile \"$path\" == $actualIsRegularFile, but $expectedIsRegularFile was expected"
-    fi
-}
+expectSuccess "pathIsDirectory /." "true"
+expectSuccess "pathIsDirectory $PWD/directory" "true"
+expectSuccess "pathIsDirectory $PWD/regular" "false"
+expectSuccess "pathIsDirectory $PWD/symlink" "false"
+expectSuccess "pathIsDirectory $PWD/fifo" "false"
+expectSuccess "pathIsDirectory $PWD/non-existent" "false"
 
-checkPathIsRegularFile "/" "false"
-checkPathIsRegularFile "$PWD/directory" "false"
-checkPathIsRegularFile "$PWD/regular" "true"
-checkPathIsRegularFile "$PWD/symlink" "false"
-checkPathIsRegularFile "$PWD/fifo" "false"
-checkPathIsRegularFile "$PWD/non-existent" "false"
+expectSuccess "pathIsRegularFile /." "false"
+expectSuccess "pathIsRegularFile $PWD/directory" "false"
+expectSuccess "pathIsRegularFile $PWD/regular" "true"
+expectSuccess "pathIsRegularFile $PWD/symlink" "false"
+expectSuccess "pathIsRegularFile $PWD/fifo" "false"
+expectSuccess "pathIsRegularFile $PWD/non-existent" "false"
 
 echo >&2 tests ok

lib/tests/modules.sh

@@ -378,7 +378,7 @@ checkConfigOutput '^{ }$' config.sub.nixosOk ./class-check.nix
 checkConfigError 'The module .*/module-class-is-darwin.nix was imported into nixos instead of darwin.' config.sub.nixosFail.config ./class-check.nix
 
 # submoduleWith type merge with different class
-checkConfigError 'error: A submoduleWith option is declared multiple times with conflicting class values "darwin" and "nixos".' config.sub.mergeFail.config ./class-check.nix
+checkConfigError 'A submoduleWith option is declared multiple times with conflicting class values "darwin" and "nixos".' config.sub.mergeFail.config ./class-check.nix
 
 # _type check
 checkConfigError 'Could not load a value as a module, because it is of type "flake", in file .*/module-imports-_type-check.nix' config.ok.config ./module-imports-_type-check.nix

lib/tests/release.nix

@@ -2,9 +2,12 @@
   # Don't test properties of pkgs.lib, but rather the lib in the parent directory
   pkgs ? import ../.. {} // { lib = throw "pkgs.lib accessed, but the lib tests should use nixpkgs' lib path directly!"; },
   nix ? pkgs.nix,
+  nixVersions ? [ pkgs.nixVersions.minimum nix pkgs.nixVersions.unstable ],
 }:
 
-pkgs.runCommand "nixpkgs-lib-tests" {
+let
+  testWithNix = nix:
+    pkgs.runCommand "nixpkgs-lib-tests-nix-${nix.version}" {
       buildInputs = [
         (import ./check-eval.nix)
         (import ./maintainers.nix {
@@ -23,7 +26,7 @@ pkgs.runCommand "nixpkgs-lib-tests" {
         nix
       ];
       strictDeps = true;
-} ''
+    } ''
       datadir="${nix}/share"
       export TEST_ROOT=$(pwd)/test-tmp
       export NIX_BUILD_HOOK=
@@ -50,5 +53,12 @@ pkgs.runCommand "nixpkgs-lib-tests" {
       echo "Running lib/tests/sources.sh"
       TEST_LIB=$PWD/lib bash lib/tests/sources.sh
 
-    touch $out
-''
+      mkdir $out
+      echo success > $out/${nix.version}
+    '';
+
+in
+  pkgs.symlinkJoin {
+    name = "nixpkgs-lib-tests";
+    paths = map testWithNix nixVersions;
+  }

lib/tests/sources.sh

@@ -23,14 +23,19 @@ clean_up() {
 trap clean_up EXIT
 cd "$work"
 
+# Crudely unquotes a JSON string by just taking everything between the first and the second quote.
+# We're only using this for resulting /nix/store paths, which can't contain " anyways,
+# nor can they contain any other characters that would need to be escaped specially in JSON
+# This way we don't need to add a dependency on e.g. jq
+crudeUnquoteJSON() {
+    cut -d \" -f2
+}
+
 touch {README.md,module.o,foo.bar}
 
-# nix-instantiate doesn't write out the source, only computing the hash, so
-# this uses the experimental nix command instead.
-
-dir="$(nix eval --impure --raw --expr '(with import <nixpkgs/lib>; "${
+dir="$(nix-instantiate --eval --strict --read-write-mode --json --expr '(with import <nixpkgs/lib>; "${
   cleanSource ./.
-}")')"
+}")' | crudeUnquoteJSON)"
 (cd "$dir"; find) | sort -f | diff -U10 - <(cat <<EOF
 .
 ./foo.bar
@@ -39,9 +44,9 @@ EOF
 ) || die "cleanSource 1"
 
 
-dir="$(nix eval --impure --raw --expr '(with import <nixpkgs/lib>; "${
+dir="$(nix-instantiate --eval --strict --read-write-mode --json --expr '(with import <nixpkgs/lib>; "${
   cleanSourceWith { src = '"$work"'; filter = path: type: ! hasSuffix ".bar" path; }
-}")')"
+}")' | crudeUnquoteJSON)"
 (cd "$dir"; find) | sort -f | diff -U10 - <(cat <<EOF
 .
 ./module.o
@@ -49,9 +54,9 @@ dir="$(nix eval --impure --raw --expr '(with import <nixpkgs/lib>; "${
 EOF
 ) || die "cleanSourceWith 1"
 
-dir="$(nix eval --impure --raw --expr '(with import <nixpkgs/lib>; "${
+dir="$(nix-instantiate --eval --strict --read-write-mode --json --expr '(with import <nixpkgs/lib>; "${
   cleanSourceWith { src = cleanSource '"$work"'; filter = path: type: ! hasSuffix ".bar" path; }
-}")')"
+}")' | crudeUnquoteJSON)"
 (cd "$dir"; find) | sort -f | diff -U10 - <(cat <<EOF
 .
 ./README.md

pkgs/tools/package-management/nix/default.nix

@@ -187,6 +187,23 @@ in lib.makeExtensible (self: {
     hash = "sha256-KjcQkI2HgbP7KOlHxb2DvyHISQXo2OExvvjqTyK7P0o=";
   };
 
+  # The minimum Nix version supported by Nixpkgs
+  # Note that some functionality *might* have been backported into this Nix version,
+  # making this package an inaccurate representation of what features are available
+  # in the actual lowest minver.nix *patch* version.
+  minimum =
+    let
+      minver = import ../../../../lib/minver.nix;
+      major = lib.versions.major minver;
+      minor = lib.versions.minor minver;
+      attribute = "nix_${major}_${minor}";
+      nix = self.${attribute};
+    in
+    if ! self ? ${attribute} then
+      throw "The minimum supported Nix version is ${minver} (declared in lib/minver.nix), but pkgs.nixVersions.${attribute} does not exist."
+    else
+      nix;
+
   stable = self.nix_2_13;
 
   unstable = self.nix_2_16;