fix: normalize dependency chart path before DirectoryExistsAt check (#2598)

When helmfile.d contains multiple release files and one release has a
local chart dependency (e.g. chart: ../chart), the dependency path was
passed to DirectoryExistsAt without normalizing against basePath. This
caused the path to be resolved against CWD instead of the helmfile
directory, so the local chart was not detected and helmfile tried to
resolve it as a remote repo, failing with:
  'failed reading adhoc dependencies: no helm list entry found for repository'

Fixes #2596

Signed-off-by: yxxhero <aiopsclub@163.com>

test/integration/run.sh

@@ -143,6 +143,7 @@ ${kubectl} create namespace ${test_ns} || fail "Could not create namespace ${tes
 . ${dir}/test-cases/issue-2424-sequential-values-paths.sh
 . ${dir}/test-cases/issue-2431.sh
 . ${dir}/test-cases/issue-2544.sh
+. ${dir}/test-cases/issue-2596-local-deps-multiple-files.sh
 . ${dir}/test-cases/kubedog-tracking.sh
 
 # ALL DONE -----------------------------------------------------------------------------------------------------------

test/integration/test-cases/issue-2596-local-deps-multiple-files.sh

@@ -0,0 +1,49 @@
+# Integration test for issue #2596: Local dependencies with multiple release files
+# https://github.com/helmfile/helmfile/issues/2596
+# Reproduction: https://github.com/vgivanov/helmfile-deps-local-chart
+#
+# This test uses the exact same structure as the reproduction repo:
+#   chart/Chart.yaml
+#   helmfile.d/release1.yaml  (chart: ../chart with dependencies)
+#   helmfile.d/release2.yaml  (chart: ../chart without dependencies)
+#
+# Before the fix, running `helmfile template` from this directory would fail with:
+#   "failed reading adhoc dependencies: no helm list entry found for repository"
+# because the relative dependency chart path "../chart" was not normalized against
+# basePath before calling DirectoryExistsAt.
+
+issue_2596_input_dir="${cases_dir}/issue-2596-local-deps-multiple-files/input"
+issue_2596_tmp=""
+
+cleanup_issue_2596() {
+  if [ -n "${issue_2596_tmp}" ] && [ -d "${issue_2596_tmp}" ]; then
+    rm -rf "${issue_2596_tmp}"
+  fi
+}
+trap cleanup_issue_2596 EXIT
+
+issue_2596_tmp=$(mktemp -d)
+helmfile_real="$(pwd)/${helmfile}"
+
+test_start "issue #2596: local deps with multiple release files"
+
+info "Testing helmfile template with local chart dependencies across multiple release files"
+
+cd "${issue_2596_input_dir}"
+
+${helmfile_real} template > "${issue_2596_tmp}/output.yaml" 2>&1
+result=$?
+
+cd - > /dev/null
+
+if [ $result -ne 0 ]; then
+    cat "${issue_2596_tmp}/output.yaml"
+    fail "helmfile template with local chart dependencies should not fail"
+fi
+
+info "Local chart dependencies with multiple release files works correctly"
+
+cleanup_issue_2596
+trap - EXIT
+
+test_pass "issue #2596: local deps with multiple release files"

test/integration/test-cases/issue-2596-local-deps-multiple-files/input/chart/Chart.yaml

@@ -0,0 +1,24 @@
+apiVersion: v2
+name: chart
+description: A Helm chart for Kubernetes
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "1.16.0"

test/integration/test-cases/issue-2596-local-deps-multiple-files/input/helmfile.d/release1.yaml

@@ -0,0 +1,8 @@
+---
+releases:
+  - name: release1
+    chart: ../chart
+    version: "*"
+    dependencies:
+      - chart: ../chart
+        version: "*"

test/integration/test-cases/issue-2596-local-deps-multiple-files/input/helmfile.d/release2.yaml

@@ -0,0 +1,5 @@
+---
+releases:
+  - name: release2
+    chart: ../chart
+    version: "*"