fix: helmfile fetch fails for kustomization directories (#2504)

* fix: helmfile fetch fails for kustomization directories

Fixes #2503

When running `helmfile fetch` on a release that points to a local
kustomization directory (without Chart.yaml), the command failed with
"Chart.yaml is missing".

The issue was that the condition `helmfileCommand != "pull"` in
prepareChartForRelease skipped chartification for ALL cases during
fetch, including local kustomization directories that NEED chartify
to convert them to Helm charts.

Solution:
- Added `NeedsChartifyForLocalDir` field to the Chartify struct to
  track when chartification is needed because the local directory
  is not a Helm chart (no Chart.yaml)
- Modified the condition to skip chartification for "pull" ONLY when
  it's not a local directory without Chart.yaml

This preserves the original fix (commit 1f134d93) for remote charts
with transformers while fixing local kustomization directories.

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

* test: add integration test for helmfile fetch with kustomization

Add test case for issue #2503 to verify helmfile fetch works correctly
with local kustomization directories (without Chart.yaml).

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

---------

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

test/integration/run.sh

@@ -107,6 +107,7 @@ ${kubectl} create namespace ${test_ns} || fail "Could not create namespace ${tes
 . ${dir}/test-cases/skip-diff-output.sh
 . ${dir}/test-cases/v1-subhelmfile-multi-bases-with-array-values.sh
 . ${dir}/test-cases/kustomized-fetch.sh
+. ${dir}/test-cases/issue-2503-kustomize-fetch.sh
 . ${dir}/test-cases/regression.sh
 . ${dir}/test-cases/secretssops.sh
 . ${dir}/test-cases/yaml-overwrite.sh

test/integration/test-cases/issue-2503-kustomize-fetch.sh

@@ -0,0 +1,14 @@
+issue_2503_input_dir="${cases_dir}/issue-2503-kustomize-fetch/input"
+
+test_start "issue-2503 helmfile fetch with kustomization directory"
+
+info "Testing helmfile fetch with local kustomization directory (issue #2503)"
+
+for i in $(seq 3); do
+    info "Testing helmfile fetch with kustomization #$i"
+    issue_2503_tmp=$(mktemp -d)
+    ${helmfile} -f ${issue_2503_input_dir}/helmfile.yaml fetch --output-dir ${issue_2503_tmp} || fail "\"helmfile fetch\" shouldn't fail with kustomization directory"
+    rm -fr ${issue_2503_tmp}
+done
+
+test_pass "issue-2503 helmfile fetch with kustomization directory"

test/integration/test-cases/issue-2503-kustomize-fetch/input/helmfile.yaml

@@ -0,0 +1,3 @@
+releases:
+- name: test-kustomize
+  chart: ./kustomize

test/integration/test-cases/issue-2503-kustomize-fetch/input/kustomize/configmap.yaml

@@ -0,0 +1,6 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-configmap
+data:
+  key: value

test/integration/test-cases/issue-2503-kustomize-fetch/input/kustomize/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+- configmap.yaml