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Validate command node type and handle multiple results with debug log

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Agent-Logs-Url: https://github.com/mikefarah/yq/sessions/928aabc5-ad71-41d8-94ab-403942e3f92d

Co-authored-by: mikefarah <1151925+mikefarah@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2026-03-28 03:27:46 +00:00 committed by GitHub
parent 5ea069a5ed
commit 53abbbaee9
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GPG Key ID: B5690EEEBB952194
3 changed files with 28 additions and 7 deletions
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2
pkg/yqlib/doc/operators/headers/system-operators.md
View File

@ -7,7 +7,7 @@ The `system` operator allows you to run an external command and use its output a
## Usage
```bash
yq --null-input --enable-system-operator '.field = system("command"; "arg1")'
yq --enable-system-operator --null-input '.field = system("command"; "arg1")'
```
The operator takes:

26
pkg/yqlib/operator_system.go
View File

@ -22,6 +22,20 @@ func resolveSystemArgs(argsNode *CandidateNode) []string {
return nil
}
func resolveCommandNode(commandNodes Context) (string, error) {
if commandNodes.MatchingNodes.Front() == nil {
return "", fmt.Errorf("system operator: command expression returned no results")
}
if commandNodes.MatchingNodes.Len() > 1 {
log.Debugf("system operator: command expression returned %d results, using first", commandNodes.MatchingNodes.Len())
}
cmdNode := commandNodes.MatchingNodes.Front().Value.(*CandidateNode)
if cmdNode.Kind != ScalarNode || cmdNode.Tag == "!!null" {
return "", fmt.Errorf("system operator: command must be a string scalar")
}
return cmdNode.Value, nil
}
func systemOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
if !ConfiguredSecurityPreferences.EnableSystemOps {
log.Warning("system operator is disabled, use --enable-system-operator flag to enable")
@ -51,10 +65,10 @@ func systemOperator(d *dataTreeNavigator, context Context, expressionNode *Expre
if err != nil {
return Context{}, err
}
if commandNodes.MatchingNodes.Front() == nil {
return Context{}, fmt.Errorf("system operator: command expression returned no results")
command, err = resolveCommandNode(commandNodes)
if err != nil {
return Context{}, err
}
command = commandNodes.MatchingNodes.Front().Value.(*CandidateNode).Value
argsNodes, err := d.GetMatchingNodes(nodeContext, block.RHS)
if err != nil {
@ -68,10 +82,10 @@ func systemOperator(d *dataTreeNavigator, context Context, expressionNode *Expre
if err != nil {
return Context{}, err
}
if commandNodes.MatchingNodes.Front() == nil {
return Context{}, fmt.Errorf("system operator: command expression returned no results")
command, err = resolveCommandNode(commandNodes)
if err != nil {
return Context{}, err
}
command = commandNodes.MatchingNodes.Front().Value.(*CandidateNode).Value
}
var stdin bytes.Buffer

7
pkg/yqlib/operator_system_test.go
View File

@ -98,6 +98,13 @@ func TestSystemOperatorEnabledScenarios(t *testing.T) {
expression: `.a = system("` + falsePath + `")`,
expectedError: "system command '" + falsePath + "' failed: exit status 1",
},
{
description: "Null command returns error",
skipDoc: true,
document: "a: hello",
expression: `.a = system(null)`,
expectedError: "system operator: command must be a string scalar",
},
}
for _, tt := range scenarios {