clean up btrfs subvolumes in an after script

hopefully prevents most of the problems we've had with server space
This commit is contained in:
Harald Sitter
2025-04-28 19:24:57 +02:00
parent c629678b29
commit dc5feaf51a
7 changed files with 469 additions and 2 deletions

3
.gitignore vendored
View File

@@ -11,8 +11,9 @@
/.secure_files/
/upload-vacuum/upload-vacuum
/upload-vacuum/vendor/
/btrfs-cleanup/target/
mkosi.local.conf
kde-linux_*
/mkosi.sandbox/etc/pacman.conf
/mkosi.sandbox/etc/pacman.conf

View File

@@ -18,7 +18,9 @@ imaging:
script:
- ./in_docker.sh --force --debug
after_script: &after_script
- "[ $CI_JOB_STATUS == 'success' ] || ./upload-to-harald.sh"
- "[ $CI_JOB_STATUS == 'success' ] || ./upload-to-harald.sh || true"
# Cleanup our btrfs subvolumes so docker doesn't stumble over them.
- cargo run --manifest-path btrfs-cleanup/Cargo.toml .
imaging+publish:
stage: start

View File

@@ -73,6 +73,7 @@ pacman --sync --refresh --noconfirm --sysupgrade \
rsync \
ruby \
ruby-nokogiri \
rust clang \
squashfs-tools \
transmission-cli \
tree \

388
btrfs-cleanup/Cargo.lock generated Normal file
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@@ -0,0 +1,388 @@
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@@ -0,0 +1,2 @@
SPDX-License-Identifier: CC0-1.0
SPDX-FileCopyrightText: none

10
btrfs-cleanup/Cargo.toml Normal file
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@@ -0,0 +1,10 @@
# SPDX-License-Identifier: BSD-2-Clause
# SPDX-FileCopyrightText: None
[package]
name = "btrfs-cleanup"
version = "0.1.0"
edition = "2024"
[dependencies]
libbtrfsutil = "0.7.1"

63
btrfs-cleanup/src/main.rs Normal file
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@@ -0,0 +1,63 @@
// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
// SPDX-FileCopyrightText: 2025 Harald Sitter <sitter@kde.org>
use libbtrfsutil::{sync, DeleteSubvolumeOptions, IterateSubvolume};
use std::{env, fs, path::PathBuf};
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() < 2 {
println!("Usage: {} <subvolume_path>", args[0]);
println!("Cleans up all subvolumes in the given path. Recursively.");
return;
}
let relative_work_path = PathBuf::from(&args[1]);
let work_path = match fs::canonicalize(&relative_work_path) {
Ok(path) => path,
Err(error) => panic!("Problem resolving {relative_work_path:?}: {error:?}"),
};
// Find the actual subvolume root. We cannot feed arbitrary paths into libbtrfsutil as it will errno out.
// Instead try iterating all the way up to / and check if we can find a subvolume.
// The end result is that subvolume_path contains path of an actual subvolume and iter is an iter.
let mut subvolume_path = work_path.clone();
let iter = loop {
let iter = match IterateSubvolume::new(&subvolume_path).iter_with_info() {
Ok(iter) => iter,
Err(error) => {
if !subvolume_path.pop() {
println!("No more parent directories to check.");
panic!("Failed to find subvolume root {error:?}");
}
continue;
}
};
break iter;
};
println!("Subvolume path: {}", subvolume_path.display());
println!("Work path: {}", work_path.display());
for (path, _info) in iter.filter_map(|s| s.ok())
{
let to_remove = subvolume_path.join(path);
// Boundary check! The "root" subvolume could be / so we need to filter our subdirectories as otherwise we would
// end up deleting stuff in /. Not the biggest concern inside docker, but in case someone runs this outside.
// Better safe than sorry.
if !to_remove.starts_with(&work_path) {
println!("Skipping {to_remove:?} as it is not a child of {work_path:?}");
continue;
}
println!("Going to remove {to_remove:?}");
match DeleteSubvolumeOptions::new().recursive(true).delete(&to_remove) {
Ok(_) => println!("Deleted subvolume: {to_remove:?}"),
Err(error) => println!("Problem deleting subvolume {to_remove:?}: {error:?}")
}
}
println!("Syncing {subvolume_path:?}");
let _ = sync(subvolume_path);
}