bssh 2.1.2

Parallel SSH command execution tool for cluster management
Documentation 
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

// Copyright 2025 Lablup Inc. and Jeongkyu Shin
//
// 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::{Context, Result};
use std::fmt;

#[derive(Debug, Clone, PartialEq)]
pub struct Node {
    pub host: String,
    pub port: u16,
    pub username: String,
}

impl Node {
    pub fn new(host: String, port: u16, username: String) -> Self {
        Self {
            host,
            port,
            username,
        }
    }

    pub fn parse(node_str: &str, default_user: Option<&str>) -> Result<Self> {
        // Parse formats:
        // - host
        // - host:port
        // - user@host
        // - user@host:port

        let (user_part, host_part) = if let Some(at_pos) = node_str.find('@') {
            let user = &node_str[..at_pos];
            let rest = &node_str[at_pos + 1..];
            (Some(user), rest)
        } else {
            (None, node_str)
        };

        let (host, port) = if let Some(colon_pos) = host_part.rfind(':') {
            let host = &host_part[..colon_pos];
            let port_str = &host_part[colon_pos + 1..];
            let port = port_str.parse::<u16>().context("Invalid port number")?;
            (host, port)
        } else {
            (host_part, 22)
        };

        let username = user_part
            .or(default_user)
            .map(|s| s.to_string())
            .unwrap_or_else(|| {
                std::env::var("USER")
                    .or_else(|_| std::env::var("USERNAME"))
                    .or_else(|_| std::env::var("LOGNAME"))
                    .unwrap_or_else(|_| whoami::username().unwrap_or_else(|_| "user".to_string()))
            });

        Ok(Node {
            host: host.to_string(),
            port,
            username,
        })
    }

    pub fn address(&self) -> String {
        format!("{}:{}", self.host, self.port)
    }
}

impl fmt::Display for Node {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}@{}:{}", self.username, self.host, self.port)
    }
}

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

    #[test]
    fn test_parse_host_only() {
        let node = Node::parse("example.com", None).unwrap();
        assert_eq!(node.host, "example.com");
        assert_eq!(node.port, 22);
    }

    #[test]
    fn test_parse_host_with_port() {
        let node = Node::parse("example.com:2222", None).unwrap();
        assert_eq!(node.host, "example.com");
        assert_eq!(node.port, 2222);
    }

    #[test]
    fn test_parse_user_and_host() {
        let node = Node::parse("admin@example.com", None).unwrap();
        assert_eq!(node.username, "admin");
        assert_eq!(node.host, "example.com");
        assert_eq!(node.port, 22);
    }

    #[test]
    fn test_parse_full_format() {
        let node = Node::parse("admin@example.com:2222", None).unwrap();
        assert_eq!(node.username, "admin");
        assert_eq!(node.host, "example.com");
        assert_eq!(node.port, 2222);
    }

    #[test]
    fn test_parse_with_default_user() {
        let node = Node::parse("example.com", Some("default_user")).unwrap();
        assert_eq!(node.username, "default_user");
    }

    #[test]
    fn test_parse_uses_current_user_when_no_default() {
        // When no user is specified, it should use current user from environment
        let node = Node::parse("example.com", None).unwrap();
        // Should not be "root" unless the current user is actually root
        let current_user = std::env::var("USER")
            .or_else(|_| std::env::var("USERNAME"))
            .or_else(|_| std::env::var("LOGNAME"))
            .unwrap_or_else(|_| whoami::username().unwrap_or_else(|_| "user".to_string()));
        assert_eq!(node.username, current_user);
        // Specifically verify it doesn't default to root when we're not root
        if current_user != "root" {
            assert_ne!(node.username, "root");
        }
    }
}