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fix: Allow patches with empty files with multiple newlines or comments #5771

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fix: Allow patches with empty files with multiple newlines or comments #5771

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1e3d875
fix: Add test, when an empty patch file is given, it should not fail
jchanam Sep 27, 2024
5952169
fix: Add code so there's no error given if an empty file is given as …
jchanam Sep 27, 2024
bfd408c
chore: Generate plugin with pluginator
jchanam Nov 19, 2024
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5 changes: 3 additions & 2 deletions api/internal/builtins/PatchTransformer.go
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5 changes: 3 additions & 2 deletions plugin/builtin/patchtransformer/PatchTransformer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,8 +59,9 @@ func (p *plugin) Config(h *resmap.PluginHelpers, c []byte) error {
patchesSM, errSM := h.ResmapFactory().RF().SliceFromBytes([]byte(p.patchText))
patchesJson, errJson := jsonPatchFromBytes([]byte(p.patchText))

if (errSM == nil && errJson == nil) ||
(patchesSM != nil && patchesJson != nil) {
if ((errSM == nil && errJson == nil) ||
(patchesSM != nil && patchesJson != nil)) &&
(len(patchesSM) > 0 && len(patchesJson) > 0) {
return fmt.Errorf(
"illegally qualifies as both an SM and JSON patch: %s",
p.patchSource)
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29 changes: 29 additions & 0 deletions plugin/builtin/patchtransformer/PatchTransformer_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1108,3 +1108,32 @@ spec:
name: test-deployment
`)
}

func TestPatchTransformerPatchEmpty(t *testing.T) {
th := kusttest_test.MakeEnhancedHarness(t).
PrepBuiltin("PatchTransformer")
defer th.Reset()

th.RunTransformerAndCheckError(`
`, someDeploymentResources, func(t *testing.T, err error) {
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@stormqueen1990 This is an example of what I mean.

Here I'm testing the input to be a file with only a new line. Based on my new code, this should give no error, but I'm getting a specific error from the tests extra code saying that the input to RunTransformerAndCheckError can't be empty.

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You're missing a go generate step for this code. The plugin/builtin/patchtransformer/PatchTransformer.go file you updated is a scaffold for the plugin generated under api/internal/builtins/PatchTransformer.go; therefore, you will need to run go generate plugin/builtin/patchtransformer/PatchTransformer.go to update the final built-in plugin code.

You can also run the prow checks locally using make prow-presubmit-check from the root of the repository.

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Thank you so much @stormqueen1990

I've just generated the plugin and pushed the change.

Regarding the test, I run them locally, but I'm given an error that IMO shouldn't happen, as it's complaining of exactly what I want to test:

2024/11/19 15:09:31 compiler created: /Users/juliochana/github/kustomize/plugin/builtin/patchtransformer/PatchTransformer.so
    harnessenhanced.go:219: config: '
        '
    harnessenhanced.go:220: Err: expected 1 resource, found 0 in [10]
--- FAIL: TestPatchTransformerPatchEmpty (0.71s)
=== RUN   TestPatchTransformerPatchEmptyOnlyComments
2024/11/19 15:09:32 compiler created: /Users/juliochana/github/kustomize/plugin/builtin/patchtransformer/PatchTransformer.so
    harnessenhanced.go:219: config: '
        # File with only comments

        # Is a virtually empty yaml
        '
    harnessenhanced.go:220: Err: expected 1 resource, found 0 in [10 35 32 70 105 108 101 32 119 105 116 104 32 111 110 108 121 32 99 111 109 109 101 110 116 115 10 10 35 32 73 115 32 97 32 118 105 114 116 117 97 108 108 121 32 101 109 112 116 121 32 121 97 109 108 10]
--- FAIL: TestPatchTransformerPatchEmptyOnlyComments (0.68s)
FAIL
FAIL	command-line-arguments	17.627s
FAIL
**** FAILURE in ./plugin/builtin/patchtransformer

I'm adding an "empty file" (for kustomize) and with my change, it should work. Could you help me improving this testing scaffolding so it stops complaining about the empty file?

if err != nil {
t.Fatalf("unexpected error")
}
})
}

func TestPatchTransformerPatchEmptyOnlyComments(t *testing.T) {
th := kusttest_test.MakeEnhancedHarness(t).
PrepBuiltin("PatchTransformer")
defer th.Reset()

th.RunTransformerAndCheckError(`
# File with only comments

# Is a virtually empty yaml
`, someDeploymentResources, func(t *testing.T, err error) {
if err != nil {
t.Fatalf("unexpected error")
}
})
}