sftpman 2.0.5

A CLI application and library for managing and mounting sshfs (SFTP) filesystems
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165

use std::thread;
use std::time::Duration;

use nix::sys::signal::kill;
use nix::sys::signal::Signal;
use nix::unistd::Pid;

use procfs::process::all_processes as get_all_processes;
use procfs::process::Process;
use procfs::ProcError;

use crate::errors::SftpManError;
use crate::FilesystemMountDefinition;

pub fn sshfs_pid_by_definition(
    definition: &FilesystemMountDefinition,
) -> Result<Option<i32>, SftpManError> {
    let processes = get_all_processes()
        .map_err(|err| SftpManError::Generic(format!("failed to list processes: {0}", err)))?;

    for process in processes.flatten() {
        if let Ok(cmd_line) = process.cmdline() {
            let program = if cmd_line.len() > 1 {
                cmd_line[0].clone()
            } else {
                "".to_owned()
            };

            if program != "sshfs" {
                continue;
            }

            let expected_arg = format!(
                "{0}@{1}:{2}",
                definition.user, definition.host, definition.remote_path
            );

            for arg in cmd_line {
                if arg == expected_arg {
                    return Ok(Some(process.pid));
                }
            }
        }
    }

    Ok(None)
}

pub fn ensure_process_killed(
    pid: i32,
    wait_time_before_dead_check: Duration,
    wait_time_before_forcefully_killing: Duration,
) -> Result<(), SftpManError> {
    if let Err(err) = kill_pid_gracefully(pid) {
        log::debug!(
            "Process {0} failed to be killed gracefully: {1:?}",
            pid,
            err
        );
    }

    log::debug!(
        "Sleeping for {0:?} before checking if the process was killed..",
        wait_time_before_dead_check,
    );

    thread::sleep(wait_time_before_dead_check);

    match is_pid_alive(pid) {
        Err(err) => {
            log::debug!(
                "Failed to check if process {0} is still alive after killing it: {1:?}",
                pid,
                err
            );

            // It may or may not be alive, so..
            // Fall through to continue killing forcefully.
        }
        Ok(alive) => {
            if !alive {
                log::debug!("Process {0} was not found to be alive anymore..", pid,);

                return Ok(());
            }

            // Still alive, so we need to do more..
            // Fall through to continue killing forcefully.
            log::debug!(
                "Process {0} was found to be alive after graceful killing..",
                pid,
            );
        }
    }

    log::debug!(
        "Sleeping for {0:?} before killing forcefully..",
        wait_time_before_forcefully_killing,
    );

    thread::sleep(wait_time_before_dead_check);

    if let Err(err) = kill_pid_forcefully(pid) {
        log::debug!(
            "Process {0} failed to be killed forcefully: {1:?}",
            pid,
            err
        );
    }

    match is_pid_alive(pid) {
        Err(err) => {
            log::debug!(
                "Failed to check if process {0} is still alive after killing it: {1:?}",
                pid,
                err
            );

            // It may or may not be alive, so..
            // Fall through to continue killing forcefully.
        }
        Ok(alive) => {
            if !alive {
                return Ok(());
            }

            return Err(SftpManError::Generic(
                "Ultimately failed to kill process".to_owned(),
            ));
        }
    }

    Ok(())
}

fn kill_pid_gracefully(pid: i32) -> Result<(), SftpManError> {
    kill_pid_with_signal(pid, Signal::SIGTERM)
}

fn kill_pid_forcefully(pid: i32) -> Result<(), SftpManError> {
    kill_pid_with_signal(pid, Signal::SIGKILL)
}

fn kill_pid_with_signal(pid: i32, signal: Signal) -> Result<(), SftpManError> {
    let pid = Pid::from_raw(pid);

    match kill(pid, signal) {
        Ok(_) => Ok(()),
        Err(e) => Err(SftpManError::Generic(format!(
            "Failed to send signal {0} to {1}: {2}",
            signal, pid, e,
        ))),
    }
}

fn is_pid_alive(pid: i32) -> Result<bool, ProcError> {
    let p = Process::new(pid);
    match p {
        Ok(_) => Ok(true),
        Err(err) => match err {
            ProcError::NotFound(_) => Ok(false),
            _ => Err(err),
        },
    }
}