tsiry-sandratraina.com
Prepare, configure, and manage Firecracker microVMs in seconds!
virtualization
linux
microvm
firecracker
feat: add exec command for Firecracker MicroVM and update dependencies
+3
-2
Cargo.lock
+3
-2
Cargo.lock
···
1016
1016
"firecracker-state",
1017
1017
"firecracker-vm",
1018
1018
"glob",
1019
+
"libc",
1019
1020
"names",
1020
1021
"num_cpus",
1021
1022
"owo-colors",
···
1702
1703
1703
1704
[[package]]
1704
1705
name = "libc"
1705
-
version = "0.2.174"
1706
+
version = "0.2.175"
1706
1707
source = "registry+https://github.com/rust-lang/crates.io-index"
1707
-
checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
1708
+
checksum = "6a82ae493e598baaea5209805c49bbf2ea7de956d50d7da0da1164f9c6d28543"
1708
1709
1709
1710
[[package]]
1710
1711
name = "libloading"
+1
README.md
+1
README.md
+1
crates/firecracker-up/Cargo.toml
+1
crates/firecracker-up/Cargo.toml
+1
crates/firecracker-up/src/cmd/cp.rs
+1
crates/firecracker-up/src/cmd/cp.rs
···
1
+
+48
crates/firecracker-up/src/cmd/exec.rs
+48
crates/firecracker-up/src/cmd/exec.rs
···
1
+
use anyhow::{anyhow, Context, Error, Result};
2
+
use firecracker_state::repo;
3
+
use owo_colors::OwoColorize;
4
+
use std::fs;
5
+
6
+
use crate::command::run_ssh_command;
7
+
8
+
pub async fn exec(name: &str, args: Vec<String>) -> Result<(), Error> {
9
+
let pool = firecracker_state::create_connection_pool().await?;
10
+
let vm = repo::virtual_machine::find(&pool, name).await?;
11
+
12
+
if vm.is_none() {
13
+
println!("[-] MicroVM '{}' not found.", name);
14
+
std::process::exit(1);
15
+
}
16
+
17
+
if !firecracker_process::vm_is_running(name).await? {
18
+
println!("[-] MicroVM '{}' is not running.", name);
19
+
let start_cmd = format!("fireup start {}", name);
20
+
println!(" Start it with {}", start_cmd.cyan());
21
+
std::process::exit(1);
22
+
}
23
+
24
+
let guest_ip = format!("{}.firecracker", name);
25
+
run_ssh_command(&get_private_key_path()?, &guest_ip, args.join(" ").as_str())?;
26
+
27
+
Ok(())
28
+
}
29
+
30
+
fn get_private_key_path() -> Result<String, Error> {
31
+
let home_dir = dirs::home_dir().ok_or_else(|| anyhow!("Failed to get home directory"))?;
32
+
let app_dir = format!("{}/.fireup", home_dir.display());
33
+
let key_name = glob::glob(format!("{}/id_rsa", app_dir).as_str())
34
+
.with_context(|| "Failed to glob ssh key files")?
35
+
.last()
36
+
.ok_or_else(|| anyhow!("No SSH key file found"))?
37
+
.with_context(|| "Failed to get SSH key path")?;
38
+
let key_name = fs::canonicalize(&key_name)
39
+
.with_context(|| {
40
+
format!(
41
+
"Failed to resolve absolute path for SSH key: {}",
42
+
key_name.display()
43
+
)
44
+
})?
45
+
.display()
46
+
.to_string();
47
+
Ok(key_name)
48
+
}
+2
crates/firecracker-up/src/cmd/mod.rs
+2
crates/firecracker-up/src/cmd/mod.rs
+71
crates/firecracker-up/src/command.rs
+71
crates/firecracker-up/src/command.rs
···
1
1
use anyhow::{anyhow, Context, Result};
2
2
use std::process::{Command, Output, Stdio};
3
3
4
+
pub fn has_sudo() -> bool {
5
+
Command::new("sudo")
6
+
.arg("-h")
7
+
.output()
8
+
.map(|output| output.status.success())
9
+
.unwrap_or(false)
10
+
}
11
+
12
+
pub fn is_root() -> bool {
13
+
unsafe { libc::getuid() == 0 }
14
+
}
15
+
4
16
pub fn run_command(command: &str, args: &[&str], with_stdin: bool) -> Result<Output> {
5
17
let mut cmd = Command::new(command);
6
18
···
34
46
}
35
47
Ok(output)
36
48
}
49
+
50
+
pub fn run_command_with_stdout_inherit(command: &str, args: &[&str], use_sudo: bool) -> Result<()> {
51
+
let mut cmd = if use_sudo {
52
+
if !has_sudo() && !is_root() {
53
+
return Err(anyhow!(
54
+
"sudo is required for command '{}', but not available",
55
+
command
56
+
));
57
+
}
58
+
let mut c = Command::new("sudo");
59
+
c.arg(command);
60
+
61
+
match is_root() {
62
+
true => Command::new(command),
63
+
false => c,
64
+
}
65
+
} else {
66
+
Command::new(command)
67
+
};
68
+
69
+
let mut child = cmd
70
+
.args(args)
71
+
.stdin(Stdio::inherit())
72
+
.stderr(Stdio::inherit())
73
+
.stdout(Stdio::inherit())
74
+
.spawn()
75
+
.with_context(|| format!("Failed to execute {}", command))?;
76
+
77
+
let status = child.wait()?;
78
+
79
+
if !status.success() {
80
+
return Err(anyhow!(
81
+
"Command {} failed with status: {}",
82
+
command,
83
+
status
84
+
));
85
+
}
86
+
87
+
Ok(())
88
+
}
89
+
90
+
pub fn run_ssh_command(key_path: &str, guest_ip: &str, command: &str) -> Result<()> {
91
+
run_command_with_stdout_inherit(
92
+
"ssh",
93
+
&[
94
+
"-q",
95
+
"-i",
96
+
key_path,
97
+
"-o",
98
+
"StrictHostKeyChecking=no",
99
+
"-o",
100
+
"UserKnownHostsFile=/dev/null",
101
+
&format!("root@{}", guest_ip),
102
+
command,
103
+
],
104
+
false,
105
+
)?;
106
+
Ok(())
107
+
}
+23
crates/firecracker-up/src/main.rs
+23
crates/firecracker-up/src/main.rs
···
166
166
.arg(arg!(<name> "Name or ID of the Firecracker MicroVM to inspect").required(true))
167
167
.about("Inspect the Firecracker MicroVM details"),
168
168
)
169
+
.subcommand(
170
+
Command::new("exec")
171
+
.arg(
172
+
arg!(<name> "Name of the Firecracker MicroVM to execute command in")
173
+
.required(true),
174
+
)
175
+
.arg(
176
+
Arg::new("args")
177
+
.help("Command and arguments to execute inside the MicroVM")
178
+
.required(true)
179
+
.num_args(1..),
180
+
)
181
+
.about("Execute a command inside the Firecracker MicroVM"),
182
+
)
169
183
.arg(arg!(--debian "Prepare Debian MicroVM").default_value("false"))
170
184
.arg(arg!(--alpine "Prepare Alpine MicroVM").default_value("false"))
171
185
.arg(arg!(--nixos "Prepare NixOS MicroVM").default_value("false"))
···
340
354
Some(("inspect", args)) => {
341
355
let name = args.get_one::<String>("name").cloned().unwrap();
342
356
inspect_microvm(&name).await?;
357
+
}
358
+
Some(("exec", args)) => {
359
+
let name = args.get_one::<String>("name").cloned().unwrap();
360
+
let cmd_args: Vec<String> = args
361
+
.get_many::<String>("args")
362
+
.unwrap()
363
+
.map(|s| s.to_string())
364
+
.collect();
365
+
cmd::exec::exec(&name, cmd_args).await?;
343
366
}
344
367
_ => {
345
368
let debian = matches.get_one::<bool>("debian").copied().unwrap_or(false);
+2
crates/firecracker-vm/src/guest.rs
+2
crates/firecracker-vm/src/guest.rs