// mockShellCommand creates a new command with the given
// name and contents, and patches $PATH so that it will be
// executed by preference. It returns the name of a file
// that is written by each call to the command - mockShellCalls
// can be used to retrieve the calls.
func mockShellCommand(c *gc.C, s *testing.CleanupSuite, name string) string {
dir := c.MkDir()
s.PatchEnvPathPrepend(dir)
// Note the shell script produces output of the form:
// +arg1+\n
// +arg2+\n
// ...
// +argn+\n
// -
//
// It would be nice if there was a simple way of unambiguously
// quoting shell arguments, but this will do as long
// as no argument contains a newline character.
outputFile := filepath.Join(dir, name+".out")
contents := `#!/bin/sh
{
for i in "$@"; do
echo +"$i"+
done
echo -
} >> ` + utils.ShQuote(outputFile) + `
`
err := ioutil.WriteFile(filepath.Join(dir, name), []byte(contents), 0755)
c.Assert(err, gc.IsNil)
return outputFile
}
