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// LXC management endpoint
// Copyright 2026 Paul Donald <newtwen+github@gmail.com>
// Licensed to the public under the Apache License 2.0.
// Built against the lxc API v6
'use strict';
import * as fs from 'fs';
import { cursor } from 'uci';
import { connect } from 'ubus';
const ctx = cursor();
const LXC_URL = ctx.get('lxc', 'lxc', 'url');
function shellquote(value) {
if (value == null)
value = '';
return "'" + replace(value, "'", "'\\''") + "'";
}
function is_valid_lxc_name(value) {
// LXC container names: start with alphanumeric or underscore, followed by
// alphanumeric, underscore, dash. No periods, no slashes, no leading dash
return type(value) == 'string' && match(value, /^[A-Za-z0-9_][A-Za-z0-9_-]{0,63}$/) != null;
}
function is_valid_lxc_template(value) {
return type(value) == 'string' && match(value, /^.+:.+$/) != null;
}
function statfs(path) {
let p = fs.popen('df -kP ' + path);
p.read('line'); // header
let line = p.read('line'); // data line
p.close();
if (!line) return null;
let cols = split(trim(line), /\s+/);
// return {
// filesystem: cols[0],
// blocks_kb: int(cols[1],10),
// used_kb: int(cols[2],10),
// avail_kb: int(cols[3],10),
// used_pct: cols[4],
// mount: cols.slice(5).join(' ')
// };
return int(cols[3],10);
}
const LXCController = {
lxc_get_downloadable: function() {
let target = this.lxc_get_arch_target(LXC_URL);
let templates = [];
let content = fs.popen(`sh /usr/share/lxc/templates/lxc-download --list --server ${shellquote(LXC_URL)} 2>/dev/null`, 'r').read('all');
content = split(content, '\n');
for (let line in content) {
let arr = match(line, /^(\S+)\s+(\S+)\s+(\S+)\s+default\s+(\S+)\s*$/);
if(length(arr) < 3) continue;
let dist = trim(arr[1]);
let version = trim(arr[2]);
let dist_target = trim(arr[3]);
if (dist && version && dist_target && dist_target == target)
push(templates, `${ dist }:${ version }`);
}
// content.close();
http.prepare_content('application/json');
http.write_json(templates);
},
lxc_create: function(lxc_name, lxc_template) {
http.prepare_content('text/plain');
if (!is_valid_lxc_name(lxc_name)) {
return;
}
if (!is_valid_lxc_template(lxc_template)) {
return;
}
let path = this.lxc_get_config_path();
if (!path) return;
let arr = match(lxc_template, /^(.+):(.+)$/);
let lxc_dist = arr[1], lxc_release = arr[2];
system(`/usr/bin/lxc-create --quiet --name ${shellquote(lxc_name)} --bdev best --template download -- --dist ${shellquote(lxc_dist)} --release ${shellquote(lxc_release)} --arch ${this.lxc_get_arch_target(LXC_URL)} --server ${shellquote(LXC_URL)}`);
while (fs.access(path + lxc_name + '/partial')) {
sleep(1000);
}
http.write('0');
},
lxc_action: function(lxc_action, lxc_name) {
let ubus = connect();
let data = ubus.call('lxc', lxc_action, { name: lxc_name });
http.prepare_content('application/json');
http.write_json(data ? data : '');
},
lxc_get_config_path: function() {
let content = fs.readfile('/etc/lxc/lxc.conf');
let ret = match(content, /^\s*lxc.lxcpath\s*=\s*(\S*)/);
if (ret && length(ret) == 2) {
if (fs.access(ret[1])) {
let min_space = int(ctx.get('lxc', 'lxc', 'min_space')) || 100000;
let free_space = statfs(ret[1]);
if (free_space && free_space >= min_space) {
let min_temp = int(ctx.get('lxc', 'lxc', 'min_temp')) || 100000;
let free_temp = statfs('/tmp');
if (free_temp && free_temp >= min_temp)
return ret[1] + '/';
else
return 'lxc error: not enough temporary space (< ' + min_temp + ' KB)';
}
else
return 'lxc error: not enough space (< ' + min_space + ' KB)';
}
else
return 'lxc error: directory not found';
}
else
return 'lxc error: config path is empty';
},
lxc_configuration_get: function(lxc_name) {
http.prepare_content('text/plain');
// Re-validate before fs.readfile as lxc_name,
// escapes the lxcpath base and reaches arbitrary files
if (!is_valid_lxc_name(lxc_name)) {
http.status(400, 'Bad Request');
return;
}
// lxc_get_config_path() returns an 'lxc error: …' string on failure
// rather than null. Refuse to proceed instead of concatenating that
// into a real filesystem path
let base = this.lxc_get_config_path();
if (!base || index(base, 'lxc error') == 0) {
http.status(500, base);
return;
}
let content = fs.readfile(base + lxc_name + '/config');
http.write(content);
},
lxc_configuration_set: function(lxc_name) {
http.prepare_content('text/plain');
// Re-validate before fs.writefile as lxc_name,
// escapes the lxcpath
if (!is_valid_lxc_name(lxc_name)) {
http.status(400, 'Bad Request');
return;
}
// lxc_get_config_path() returns an 'lxc error: …' string on failure
// rather than null. Refuse to proceed instead of concatenating that
// into a real filesystem path
let base = this.lxc_get_config_path();
if (!base || index(base, 'lxc error') == 0) {
http.status(500, base);
return;
}
let lxc_configuration = http.formvalue('lxc_conf');
lxc_configuration = http.urldecode(lxc_configuration, true);
if (!lxc_configuration) {
return 'lxc error: config formvalue is empty';
}
fs.writefile(base + lxc_name + '/config', lxc_configuration);
http.write('0');
},
lxc_get_arch_target: function(url) {
let target = split(fs.popen('uname -m', 'r').read('line'), '\n');
if (url && match(url, /images.linuxcontainers.org/)) {
let target_map = {
armv5: 'armel',
armv6: 'armel',
armv7: 'armhf',
armv8: 'arm64',
aarch64:'arm64',
i686 : 'i386',
x86_64: 'amd64',
};
for (let k, v in target_map) {
if (target[0] == k) {
return v;
}
}
}
return target[0];
},
};
// Export all handlers with automatic error wrapping
let controller = LXCController;
let exports = {};
for (let k, v in controller) {
if (type(v) == 'function')
exports[k] = v;
}
return exports;
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