Don't use the baseURL /path as part of the resource cache key

As that prevents Hugo projects with sub paths in their `baseURL` to use themes with cached resources.

Fixes #9787

hugolib/integrationtest_builder.go

@@ -41,6 +41,7 @@ func NewIntegrationTestBuilder(conf IntegrationTestConfig) *IntegrationTestBuild
 	}
 
 	if conf.NeedsOsFS {
+		if !filepath.IsAbs(conf.WorkingDir) {
 			tempDir, clean, err := htesting.CreateTempDir(hugofs.Os, "hugo-integration-test")
 			c.Assert(err, qt.IsNil)
 			conf.WorkingDir = filepath.Join(tempDir, conf.WorkingDir)
@@ -49,6 +50,7 @@ func NewIntegrationTestBuilder(conf IntegrationTestConfig) *IntegrationTestBuild
 			} else {
 				fmt.Println("\nUsing WorkingDir dir:", conf.WorkingDir)
 			}
+		}
 	} else if conf.WorkingDir == "" {
 		conf.WorkingDir = helpers.FilePathSeparator
 	}

resources/resource.go

@@ -20,6 +20,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"strings"
 	"sync"
 
 	"github.com/gohugoio/hugo/resources/internal"
@@ -267,8 +268,11 @@ func (l *genericResource) Data() any {
 }
 
 func (l *genericResource) Key() string {
+	if l.spec.BasePath == "" {
 		return l.RelPermalink()
 	}
+	return strings.TrimPrefix(l.RelPermalink(), l.spec.BasePath)
+}
 
 func (l *genericResource) MediaType() media.Type {
 	return l.mediaType

resources/resource_transformers/postcss/integration_test.go

@@ -23,6 +23,7 @@ import (
 
 	qt "github.com/frankban/quicktest"
 	"github.com/gohugoio/hugo/htesting"
+	"github.com/gohugoio/hugo/hugofs"
 	"github.com/gohugoio/hugo/hugolib"
 )
 
@@ -55,6 +56,9 @@ h1 {
 
 -- config.toml --
 disablekinds = ['taxonomy', 'term', 'page']
+baseURL = "https://example.com"
+[build]
+useResourceCacheWhen = 'never'
 -- content/p1.md --
 -- data/hugo.toml --
 slogan = "Hugo Rocks!"
@@ -99,6 +103,22 @@ func TestTransformPostCSS(t *testing.T) {
 	}
 
 	c := qt.New(t)
+	tempDir, clean, err := htesting.CreateTempDir(hugofs.Os, "hugo-integration-test")
+	c.Assert(err, qt.IsNil)
+	c.Cleanup(clean)
+
+	for _, s := range []string{"never", "always"} {
+
+		repl := strings.NewReplacer(
+			"https://example.com",
+			"https://example.com/foo",
+			"useResourceCacheWhen = 'never'",
+			fmt.Sprintf("useResourceCacheWhen = '%s'", s),
+		)
+
+		files := repl.Replace(postCSSIntegrationTestFiles)
+
+		fmt.Println("===>", s, files)
 
 		b := hugolib.NewIntegrationTestBuilder(
 			hugolib.IntegrationTestConfig{
@@ -106,20 +126,19 @@ func TestTransformPostCSS(t *testing.T) {
 				NeedsOsFS:       true,
 				NeedsNpmInstall: true,
 				LogLevel:        jww.LevelInfo,
-			TxtarString:     postCSSIntegrationTestFiles,
+				WorkingDir:      tempDir,
+				TxtarString:     files,
 			}).Build()
 
-	b.AssertLogContains("Hugo Environment: production")
-	b.AssertLogContains(filepath.FromSlash(fmt.Sprintf("PostCSS Config File: %s/postcss.config.js", b.Cfg.WorkingDir)))
-	b.AssertLogContains(filepath.FromSlash(fmt.Sprintf("package.json: %s/package.json", b.Cfg.WorkingDir)))
-
 		b.AssertFileContent("public/index.html", `
-Styles RelPermalink: /css/styles.css
+Styles RelPermalink: /foo/css/styles.css
 Styles Content: Len: 770917|
 `)
 
 	}
 
+}
+
 // 9880
 func TestTransformPostCSSError(t *testing.T) {
 	if !htesting.IsCI() {
@@ -186,3 +205,40 @@ func TestTransformPostCSSImporSkipInlineImportsNotFound(t *testing.T) {
 	s.AssertFileContent("public/css/styles.css", `@import "components/doesnotexist.css";`)
 
 }
+
+// Issue 9787
+func TestTransformPostCSSResourceCacheWithPathInBaseURL(t *testing.T) {
+	if !htesting.IsCI() {
+		t.Skip("Skip long running test when running locally")
+	}
+
+	c := qt.New(t)
+	tempDir, clean, err := htesting.CreateTempDir(hugofs.Os, "hugo-integration-test")
+	c.Assert(err, qt.IsNil)
+	c.Cleanup(clean)
+
+	for i := 0; i < 2; i++ {
+		files := postCSSIntegrationTestFiles
+
+		if i == 1 {
+			files = strings.ReplaceAll(files, "https://example.com", "https://example.com/foo")
+			files = strings.ReplaceAll(files, "useResourceCacheWhen = 'never'", "	useResourceCacheWhen = 'always'")
+		}
+
+		b := hugolib.NewIntegrationTestBuilder(
+			hugolib.IntegrationTestConfig{
+				T:               c,
+				NeedsOsFS:       true,
+				NeedsNpmInstall: true,
+				LogLevel:        jww.LevelInfo,
+				TxtarString:     files,
+				WorkingDir:      tempDir,
+			}).Build()
+
+		b.AssertFileContent("public/index.html", `
+Styles Content: Len: 770917
+`)
+
+	}
+
+}