1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88

// This is not a normal Rust module! It's included directly into v2.rs,
// possibly after build-time preprocessing.  See v2.rs for an explanation
// of how this works.

/// A command line to be executed by Docker.
#[derive(PartialEq, Eq, Clone, Debug)]
pub enum CommandLine {

    /// A command-line specified as unparsed shell code.
    ShellCode(RawOr<String>),

    /// A pre-parsed command-line.  This may actually be empty for fields
    /// like `command`, so we don't try to enforce a minimal length, even
    /// if other fields like `entrypoint` supposedly want at least one
    /// entry.
    Parsed(Vec<RawOr<String>>),
}

impl MergeOverride for CommandLine { }
impl InterpolateAll for CommandLine { }

impl Serialize for CommandLine {
    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where
     S: Serializer {
        match self {
            &CommandLine::ShellCode(ref s) => s.serialize(serializer),
            &CommandLine::Parsed(ref l) => l.serialize(serializer),
        }
    }
}

impl Deserialize for CommandLine {
    fn deserialize<D>(deserializer: &mut D) -> Result<CommandLine, D::Error>
     where D: Deserializer {
        struct CommandLineVisitor;

        impl Visitor for CommandLineVisitor {
            type
            Value
            =
            CommandLine;

            // The deserializer found a string, so handle it.
            fn visit_str<E>(&mut self, value: &str) -> Result<CommandLine, E>
             where E: de::Error {
                Ok(CommandLine::ShellCode(try!(raw ( value ) . map_err (
                                               | err | {
                                               E :: custom (
                                               format ! ( "{}" , err ) ) }
                                               ))))
            }

            // The deserializer found a sequence.
            fn visit_seq<V>(&mut self, mut visitor: V)
             -> Result<Self::Value, V::Error> where V: SeqVisitor {
                let mut args: Vec<RawOr<String>> = vec!();
                while let Some(arg) = try!(visitor . visit :: < String > (  ))
                          {
                    args.push(try!(raw ( arg ) . map_err (
                                   | err | {
                                   < V :: Error as serde :: Error > :: custom
                                   ( format ! ( "{}" , err ) ) } )));
                }
                try!(visitor . end (  ));
                Ok(CommandLine::Parsed(args))
            }
        }

        deserializer.deserialize(CommandLineVisitor)
    }
}

#[test]
fn command_line_may_be_shell_code() {
    let yaml = r#"---
"ls $DIR"
"#;
    assert_roundtrip!(CommandLine , yaml);
}

#[test]
fn command_line_may_be_parsed() {
    let yaml = r#"---
- "ls"
- "/"
"#;
    assert_roundtrip!(CommandLine , yaml);
}