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WSL: Deal with dangling /mnt/wsl/rancher-desktop

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It's possible that our data mount still exists, but the underlying disk has
went away.  In that case, we can safely unmount it (because the device went
away, nobody can complain), and then re-mount it.

Signed-off-by: Mark Yen <mark.yen@suse.com>
This commit is contained in:
Mark Yen
2021-10-07 15:34:59 -07:00
parent 0164c8b897
commit a1cddf3ed6
1 changed files with 42 additions and 6 deletions
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48
src/k8s-engine/wsl.ts
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@@ -329,17 +329,53 @@ export default class WSLBackend extends events.EventEmitter implements K8s.Kuber
// shared mount (/mnt/wsl/), it can persist even if all of our distribution
// instances terminate, as long as the WSL VM is still running. Once that
// happens, it is no longer possible to unmount the bind mount...
// However, there's an exception: the underlying device could have gone
// missing (!); if that happens, we _can_ unmount it.
const mountInfo = await this.execWSL(
{ capture: true, encoding: 'utf-8' },
'--distribution', DATA_INSTANCE_NAME, '--exec', 'busybox', 'cat', '/proc/self/mountinfo');
// https://www.kernel.org/doc/html/latest/filesystems/proc.html#proc-pid-mountinfo-information-about-mounts
// We want field 5, "mount point". There are no optional fields before that one.
const hasMount = mountInfo
.split(/\r?\n/)
.map(line => line.split(/\s+/)[4])
.includes(mountRoot);
// We want fields 5 "mount point" and 10 "mount source".
const matchRegex = new RegExp(String.raw`
(?<mountID>\S+)
(?<parentID>\S+)
(?<majorMinor>\S+)
(?<root>\S+)
(?<mountPoint>\S+)
(?<mountOptions>\S+)
(?<optionalFields>.*?)
-
(?<fsType>\S+)
(?<mountSource>\S+)
(?<superOptions>\S+)
`.trim().replace(/\s+/g, String.raw`\s+`));
const mountFields = mountInfo.split(/\r?\n/).map(line => matchRegex.exec(line)).filter(defined);
let hasValidMount = false;
if (!hasMount) {
for (const mountLine of mountFields) {
const { mountPoint, mountSource: device } = mountLine.groups ?? {};
if (mountPoint !== mountRoot || !device) {
continue;
}
// Some times we can have the mount but the disk is missing.
// In that case we need to umount it, and the re-mount.
try {
await this.execWSL(
{ expectFailure: true },
'--distribution', DATA_INSTANCE_NAME, '--exec', 'busybox', 'test', '-e', device);
console.log(`Found a valid mount with ${ device }: ${ mountLine.input }`);
hasValidMount = true;
} catch (ex) {
// Busybox returned error, the devices doesn't exist. Unmount.
console.log(`Unmounting missing device ${ device }: ${ mountLine.input }`);
await this.execWSL(
'--distribution', DATA_INSTANCE_NAME, '--exec', 'busybox', 'umount', mountRoot);
}
}
if (!hasValidMount) {
console.log(`Did not find a valid mount, mounting ${ mountRoot }`);
await this.execWSL('--distribution', DATA_INSTANCE_NAME, 'mount', '--bind', '/', mountRoot);
}
await Promise.all(DISTRO_DATA_DIRS.map(async(dir) => {