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Add locking around operations which change the configuration. (#1644) 

* Add locking around operations which change the configuration.
Avoid any potential race conditions when changing the configuration
by putting a lock around any non-GET operations.

* Add a sync before a 'reboot' operation
This commit is contained in:
Tim Wilkinson 2024-10-23 18:32:48 -07:00 committed by GitHub
parent 1edfae6dae
commit a814f8b0ac
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GPG Key ID: B5690EEEBB952194
2 changed files with 23 additions and 14 deletions
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22
files/app/root.ut
View File

@ -54,12 +54,11 @@ import * as constants from "./constants.uc";
const pageCache = {};
const resourceVersions = {};
const lockfile = "/tmp/ui.lock";
log.openlog("uhttpd.aredn", log.LOG_PID, log.LOG_USER);
const light = fs.readfile(`${config.application}/resource/css/themes/light.css`);
const dark = fs.readfile(`${config.application}/resource/css/themes/dark.css`);
fs.writefile(`${config.application}/resource/css/themes/default.css`, `${light}@media (prefers-color-scheme: dark) {\n${dark}\n}`);
fs.writefile(`${config.application}/resource/css/themes/default.css`, `${fs.readfile(`${config.application}/resource/css/themes/light.css`)}@media (prefers-color-scheme: dark) {\n${fs.readfile(`${config.application}/resource/css/themes/dark.css`)}\n}`);
if (!fs.access(`${config.application}/resource/css/theme.css`)) {
fs.symlink("themes/default.css", `${config.application}/resource/css/theme.css`);
}
@ -80,8 +79,6 @@ if (config.preload) {
}
cp("/main/");
cp("/partial/");
radios.getCommonConfiguration();
}
if (config.resourcehash) {
@ -145,6 +142,8 @@ else {
fs.unlink(`${config.application}/resource/css/theme.version`);
}
fs.writefile(lockfile, "");
global._R = function(path, arg)
{
const tpath = `${config.application}/partial/${path}.ut`;
@ -452,6 +451,14 @@ global.handle_request = function(env)
return;
}
}
let changelock = null;
if (env.REQUEST_METHOD !== "GET") {
changelock = fs.open(lockfile);
if (!(changelock && changelock.lock("x"))) {
uhttpd.send("Status: 500 Internal server error\r\n\r\n");
return;
}
}
const args = {};
if (env.CONTENT_TYPE === "application/x-www-form-urlencoded") {
let b = "";
@ -590,8 +597,11 @@ global.handle_request = function(env)
res
);
}
if (changelock) {
changelock.close();
}
if (response.reboot) {
system(`(sleep 2; ${response.reboot})&`);
system(`(sleep 2; sync; ${response.reboot})&`);
}
return;
}

15
files/usr/share/ucode/aredn/configuration.uc
View File

@ -102,15 +102,12 @@ function initSetup()
setupKeys = [];
const f = fs.open("/etc/config.mesh/_setup");
if (f) {
for (;;) {
const line = f.read("line");
if (!length(line)) {
break;
}
const kv = split(line, " =", 2);
for (let l = f.read("line"); length(l); l = f.read("line")) {
const kv = split(l, "=", 2);
if (length(kv) === 2) {
setup[kv[0]] = trim(kv[1]);
push(setupKeys, kv[0]);
const k = trim(kv[0]);
setup[k] = trim(kv[1]);
push(setupKeys, k);
}
}
f.close();
@ -121,7 +118,9 @@ function initSetup()
export function reset()
{
setup = null;
setupKeys = null;
cursor = null;
setupChanged = false;
};
export function getSettingAsString(key, def)