cubic 0.16.0

Cubic is a lightweight command line manager for virtual machines. It has a simple, daemon-less and rootless design. All Cubic virtual machines run isolated in the user context. Cubic is built on top of QEMU, KVM and cloud-init. Show all supported images: $ cubic images Create a new virtual machine instance: $ cubic create mymachine --image ubuntu:noble List all virtual machine instances: $ cubic instances Start an instance: $ cubic start <instance name> Stop an instance: $ cubic stop <instance name> Open a shell in the instance: $ cubic ssh <machine name> Copy a file from the host to the instance: $ cubic scp <path/to/host/file> <machine>:<path/to/guest/file> Copy a file from the instance to the hots: $ cubic scp <machine>:<path/to/guest/file> <path/to/host/file> 
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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

use crate::fs::FS;
use crate::instance::TargetInstancePath;
use crate::ssh_cmd::Ssh;
use crate::util::SystemCommand;
use crate::view::{Console, SpinnerView};
use std::path::Path;
use std::thread;
use std::time::{Duration, Instant};

#[derive(Default)]
pub struct Openssh {
    known_hosts_file: Option<String>,
    private_keys: Vec<String>,
    args: String,
    cmd: Option<String>,
}

impl Openssh {
    pub fn new() -> Self {
        Self::default()
    }

    fn create_system_command(
        &mut self,
        console: &mut dyn Console,
        user: &str,
        port: u16,
        xforward: bool,
    ) -> SystemCommand {
        let mut command = SystemCommand::new("ssh");

        if let Some(ref known_hosts_file) = self.known_hosts_file {
            Path::new(known_hosts_file)
                .parent()
                .and_then(|dir| dir.to_str())
                .map(|dir| FS::new().create_dir(dir));

            command.arg(format!("-oUserKnownHostsFile={known_hosts_file}"));
        }

        command
            .arg(format!("-p{port}"))
            .arg("-oPreferredAuthentications=publickey,password")
            .arg("-oStrictHostKeyChecking=accept-new")
            .args(
                self.private_keys
                    .iter()
                    .map(|key| format!("-i{key}"))
                    .collect::<Vec<_>>(),
            )
            .args(xforward.then_some("-X").as_slice())
            .args(self.args.split(' ').filter(|item| !item.is_empty()))
            .arg(format!("{}@127.0.0.1", user))
            .args(self.cmd.as_slice());

        console.debug(&command.get_command());
        command
    }

    fn shell_internal(
        &mut self,
        console: &mut dyn Console,
        user: &str,
        port: u16,
        xforward: bool,
    ) -> bool {
        let mut child = self
            .create_system_command(console, user, port, xforward)
            .spawn()
            .unwrap();
        if let Ok(exit) = child.wait() {
            exit.success()
        } else {
            false
        }
    }
}

impl Ssh for Openssh {
    fn set_known_hosts_file(&mut self, path: Option<String>) {
        self.known_hosts_file = path;
    }

    fn set_private_keys(&mut self, private_keys: Vec<String>) {
        self.private_keys = private_keys;
    }

    fn set_args(&mut self, args: String) {
        self.args = args;
    }

    fn set_cmd(&mut self, cmd: Option<String>) {
        self.cmd = cmd;
    }

    fn shell(&mut self, console: &mut dyn Console, user: &str, port: u16, xforward: bool) -> bool {
        loop {
            let start_time = Instant::now();
            if self.shell_internal(console, user, port, xforward) {
                // exit on success
                break;
            }

            if !self.args.is_empty() || start_time.elapsed().as_secs() > 5 {
                // exit if cli command or time expired
                break;
            }

            let spinner =
                (!console.get_verbosity().is_quiet()).then(|| SpinnerView::new("Try to connect"));
            thread::sleep(Duration::from_secs(5));
            if let Some(mut s) = spinner {
                s.stop()
            }
        }
        true
    }

    fn copy(
        &self,
        console: &mut dyn Console,
        root_dir: &str,
        from: &TargetInstancePath,
        to: &TargetInstancePath,
    ) -> bool {
        let mut command = SystemCommand::new(&format!("{root_dir}/usr/bin/scp"));

        if let Some(ref known_hosts_file) = self.known_hosts_file {
            Path::new(known_hosts_file)
                .parent()
                .and_then(|dir| dir.to_str())
                .map(|dir| FS::new().create_dir(dir));

            command.arg(format!("-oUserKnownHostsFile={known_hosts_file}"));
        }

        command
            .arg("-3")
            .arg("-r")
            .arg(format!("-S{root_dir}/usr/bin/ssh"))
            .args(self.private_keys.iter().map(|key| format!("-i{key}")))
            .args(self.args.split(' ').filter(|item| !item.is_empty()))
            .arg(from.to_scp())
            .arg(to.to_scp());

        console.debug(&command.get_command());
        command
            .set_stdout(!console.get_verbosity().is_quiet())
            .run()
            .is_ok()
    }
}