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
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137

// Copyright 2021 Red Hat
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use anyhow::{bail, Context, Result};
use base64::{engine::general_purpose::STANDARD as BASE64, Engine};
use flate2::read::GzEncoder;
use flate2::Compression;
use ignition_config as ign_multi;
use ignition_config::v3_3 as ign;
use std::io::Read;

#[derive(Debug, Default)]
pub struct Ignition {
    config: ign::Config,
}

impl Ignition {
    pub fn merge_config(&mut self, config: &ign_multi::Config) -> Result<()> {
        let buf = serde_json::to_vec(config).context("serializing child Ignition config")?;
        self.config
            .ignition
            .config
            .get_or_insert_with(Default::default)
            .merge
            .get_or_insert_with(Default::default)
            .push(make_resource(&buf)?);
        Ok(())
    }

    pub fn add_file(&mut self, path: String, data: &[u8], mode: i64) -> Result<()> {
        // Perform the same alias check that Ignition config validation does.
        // This doesn't catch aliases known only at runtime, such as
        // /usr/local and /var/usrlocal.
        if self.have_path(&path) {
            bail!("config already specifies path {}", path);
        }
        self.config
            .storage
            .get_or_insert_with(Default::default)
            .files
            .get_or_insert_with(Default::default)
            .push(ign::File {
                contents: Some(make_resource(data)?),
                mode: Some(mode),
                ..ign::File::new(path)
            });
        Ok(())
    }

    pub fn add_unit(&mut self, name: String, contents: String, enabled: bool) -> Result<()> {
        let units = self
            .config
            .systemd
            .get_or_insert_with(Default::default)
            .units
            .get_or_insert_with(Default::default);
        if units.iter().any(|u| u.name == name) {
            bail!("config already specifies unit {}", name);
        }
        units.push(ign::Unit {
            contents: Some(contents),
            enabled: Some(enabled),
            ..ign::Unit::new(name)
        });
        Ok(())
    }

    pub fn add_ca(&mut self, data: &[u8]) -> Result<()> {
        self.config
            .ignition
            .security
            .get_or_insert_with(Default::default)
            .tls
            .get_or_insert_with(Default::default)
            .certificate_authorities
            .get_or_insert_with(Default::default)
            .push(make_resource(data)?);
        Ok(())
    }

    pub fn to_bytes(&self) -> Result<Vec<u8>> {
        let mut json = serde_json::to_vec(&self.config).context("serializing Ignition config")?;
        json.push(b'\n');
        Ok(json)
    }

    fn have_path(&self, path: &str) -> bool {
        let storage = self.config.storage.clone().unwrap_or_default();
        storage
            .files
            .unwrap_or_default()
            .iter()
            .map(|f| &f.path)
            .chain(
                storage
                    .directories
                    .unwrap_or_default()
                    .iter()
                    .map(|d| &d.path),
            )
            .chain(storage.links.unwrap_or_default().iter().map(|l| &l.path))
            .any(|p| p == path)
    }
}

fn make_resource(data: &[u8]) -> Result<ign::Resource> {
    let mut compressed = Vec::new();
    GzEncoder::new(data, Compression::best()).read_to_end(&mut compressed)?;
    Ok(ign::Resource {
        source: Some(format!("data:;base64,{}", BASE64.encode(&compressed))),
        compression: Some("gzip".into()),
        ..Default::default()
    })
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn duplicate_path() {
        let mut ignition = Ignition::default();
        ignition.add_file("/a/b".into(), &[], 0o755).unwrap();
        ignition.add_file("/a/b".into(), &[], 0o755).unwrap_err();
    }
}