36 lines
831 B
Go
36 lines
831 B
Go
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package external
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import (
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"fmt"
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"os/exec"
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)
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// validateProgramAttr is a validation function for the "program" attribute we
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// accept as input on our resources.
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//
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// The attribute is assumed to be specified in schema as a list of strings.
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func validateProgramAttr(v interface{}) error {
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args := v.([]interface{})
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if len(args) < 1 {
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return fmt.Errorf("'program' list must contain at least one element")
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}
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for i, vI := range args {
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if _, ok := vI.(string); !ok {
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return fmt.Errorf(
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"'program' element %d is %T; a string is required",
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i, vI,
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)
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}
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}
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// first element is assumed to be an executable command, possibly found
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// using the PATH environment variable.
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_, err := exec.LookPath(args[0].(string))
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if err != nil {
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return fmt.Errorf("can't find external program %q", args[0])
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}
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return nil
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}
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