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authordiogo464 <[email protected]>2024-01-01 18:13:30 +0000
committerdiogo464 <[email protected]>2024-01-01 18:13:30 +0000
commit48d563959b3d6cbe6edc7921cfa1fd22935177d2 (patch)
tree59a0518e1309f073172870652bbd00a935065e3c
init
Diffstat
-rw-r--r--.gitea/workflows/build.yaml11
-rw-r--r--.gitignore1
-rw-r--r--Cargo.lock922
-rw-r--r--Cargo.toml21
-rw-r--r--README.md30
-rw-r--r--src/cfg.rs90
-rw-r--r--src/main.rs135
-rw-r--r--src/zfs.rs87
8 files changed, 1297 insertions, 0 deletions
diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
new file mode 100644
index 0000000..af317fd
--- /dev/null
+++ b/.gitea/workflows/build.yaml
@@ -0,0 +1,11 @@
1name: build
2on: [push]
3jobs:
4 build:
5 runs-on: [ubuntu-latest]
6 steps:
7 - name: Checkout repository
8 uses: actions/checkout@v4
9 - uses: dtolnay/rust-toolchain@nightly
10 - name: Build
11 run: cargo build --release
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..50a974f
--- /dev/null
+++ b/Cargo.lock
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916 "cron",
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918 "serde",
919 "toml",
920 "tracing",
921 "tracing-subscriber",
922]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..221fcd3
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,21 @@
1[package]
2name = "zsnap"
3version = "0.1.0"
4edition = "2021"
5
6# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
7
8[dependencies]
9chrono = "0.4.31"
10clap = { version = "4.4.12", features = ["env", "derive"] }
11color-eyre = "0.6.2"
12cron = "0.12.0"
13eyre = "0.6.11"
14serde = { version = "1.0.193", features = ["derive"] }
15toml = "0.8.8"
16tracing = "0.1.40"
17tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
18
19[profile.release]
20strip = true
21opt-level = "z"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..864dfdf
--- /dev/null
+++ b/README.md
@@ -0,0 +1,30 @@
1# zsnap
2
3zsnap [--config zsnap.toml] run
4zsnap [--config zsnap.toml] snapshot --tag my-tag dataset
5zsnap [--config zsnap.toml] prune [--tag my-tag] [--keep n] dataset
6
7```zsnap.toml
8[dataset."blackmesa/k8s"]
9schedules = ["hourly", "daily", "weekly", "monthly"]
10recursive = true
11
12[dataset."blackmesa/gitea"]
13schedules = ["hourly", "daily", "weekly", "monthly"]
14
15[schedule.hourly]
16cron = "@hourly"
17keep = 24
18
19[schedule.daily]
20cron = "@daily"
21keep = 7
22
23[schedule.weekly]
24cron = "@weekly"
25keep = 4
26
27[schedule.monthly]
28cron = "@monthly"
29keep = 6
30```
diff --git a/src/cfg.rs b/src/cfg.rs
new file mode 100644
index 0000000..6c3740c
--- /dev/null
+++ b/src/cfg.rs
@@ -0,0 +1,90 @@
1use std::{collections::HashMap, path::Path, str::FromStr};
2
3use eyre::{Context, Result};
4use serde::Deserialize;
5
6#[derive(Debug, Default)]
7pub struct Config {
8 pub datasets: Vec<Dataset>,
9 pub schedules: Vec<Schedule>,
10}
11
12impl Config {
13 pub fn dataset(&self, name: &str) -> Option<&Dataset> {
14 self.datasets.iter().find(|d| d.name == name)
15 }
16
17 pub fn tag(&self, tag: &str) -> Option<&Schedule> {
18 self.schedules.iter().find(|s| s.tag == tag)
19 }
20}
21
22#[derive(Debug, Clone)]
23pub struct Dataset {
24 pub name: String,
25 pub schedules: Vec<String>,
26 pub recursive: bool,
27}
28
29impl Dataset {
30 pub fn has_tag(&self, tag: &str) -> bool {
31 self.schedules.iter().any(|s| s == tag)
32 }
33}
34
35#[derive(Debug, Clone)]
36pub struct Schedule {
37 pub tag: String,
38 pub cron: cron::Schedule,
39 pub keep: usize,
40}
41
42#[derive(Debug, Deserialize)]
43struct TomlConfig {
44 dataset: HashMap<String, TomlDataset>,
45 schedule: HashMap<String, TomlSchedule>,
46}
47
48#[derive(Debug, Deserialize)]
49struct TomlDataset {
50 recursive: Option<bool>,
51 schedules: Vec<String>,
52}
53
54#[derive(Debug, Deserialize)]
55struct TomlSchedule {
56 cron: String,
57 keep: usize,
58}
59
60pub fn read(path: &Path) -> Result<Config> {
61 let content = std::fs::read_to_string(path)?;
62 let config = toml::from_str::<TomlConfig>(&content)?;
63
64 let mut datasets = Vec::new();
65 let mut schedules = Vec::new();
66
67 for (name, dataset) in config.dataset {
68 let schedules = dataset.schedules;
69 let recursive = dataset.recursive;
70
71 datasets.push(Dataset {
72 name,
73 schedules,
74 recursive: recursive.unwrap_or_default(),
75 });
76 }
77
78 for (name, schedule) in config.schedule {
79 let cron = cron::Schedule::from_str(&schedule.cron)
80 .with_context(|| format!("parsing cron schedule: '{}'", &schedule.cron))?;
81 let keep = schedule.keep;
82
83 schedules.push(Schedule { tag: name, cron, keep });
84 }
85
86 Ok(Config {
87 datasets,
88 schedules,
89 })
90}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e31764d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,135 @@
1#![feature(try_blocks)]
2use std::path::PathBuf;
3
4use clap::Parser;
5use eyre::{Context, Result};
6
7mod cfg;
8mod zfs;
9
10#[derive(Debug, Parser)]
11struct Args {
12 /// Path to the configuration file
13 #[clap(long, env = "ZSNAP_CONFIG")]
14 config: Option<PathBuf>,
15
16 #[clap(subcommand)]
17 command: Subcommand,
18}
19
20#[derive(Debug, Parser)]
21enum Subcommand {
22 Run(RunArgs),
23 Snapshot(SnapshotArgs),
24 Prune(PruneArgs),
25}
26
27#[derive(Debug, Parser)]
28struct RunArgs {}
29
30#[derive(Debug, Parser)]
31struct SnapshotArgs {
32 /// the tag to snapshot with
33 #[clap(long)]
34 tag: String,
35
36 #[clap(long)]
37 recursive: bool,
38
39 /// the datasets to snapshot
40 dataset: Vec<String>,
41}
42
43#[derive(Debug, Parser)]
44struct PruneArgs {
45 /// the tag to prune
46 #[clap(long)]
47 tag: String,
48
49 /// the number of snapshots to keep
50 #[clap(long)]
51 keep: usize,
52
53 /// whether to prune recursively
54 #[clap(long)]
55 recursive: bool,
56
57 /// the datasets to prune
58 dataset: Vec<String>,
59}
60
61fn main() -> Result<()> {
62 color_eyre::install()?;
63 tracing_subscriber::fmt::init();
64
65 let args = Args::parse();
66 let config = match args.config {
67 Some(config_path) => cfg::read(&config_path).context("reading config")?,
68 None => Default::default(),
69 };
70
71 match args.command {
72 Subcommand::Run(_) => cmd_run(config),
73 Subcommand::Snapshot(args) => cmd_snapshot(args),
74 Subcommand::Prune(args) => cmd_prune(args),
75 }
76}
77
78fn cmd_run(config: cfg::Config) -> Result<()> {
79 for schedule in config.schedules {
80 let datasets = config.datasets.clone();
81 std::thread::spawn(move || snapshot_mainloop(schedule, datasets));
82 }
83 loop {
84 std::thread::park();
85 }
86}
87
88fn cmd_snapshot(args: SnapshotArgs) -> Result<()> {
89 for dataset in args.dataset {
90 zfs::snapshot_create(&args.tag, &dataset, args.recursive)?;
91 }
92 Ok(())
93}
94
95fn cmd_prune(args: PruneArgs) -> Result<()> {
96 for dataset in args.dataset {
97 zfs::snapshot_prune(&args.tag, &dataset, args.recursive, args.keep)?;
98 }
99 Ok(())
100}
101
102fn snapshot_mainloop(schedule: cfg::Schedule, datasets: Vec<cfg::Dataset>) {
103 for next_trigger in schedule.cron.upcoming(chrono::Utc) {
104 let now = chrono::Utc::now().timestamp();
105 let next = next_trigger.timestamp();
106 let sleep = next.saturating_sub(now) as u64;
107 std::thread::sleep(std::time::Duration::from_secs(sleep));
108
109 for dataset in datasets.iter().filter(|d| d.has_tag(&schedule.tag)) {
110 if let Err(err) = zfs::snapshot_create(&schedule.tag, &dataset.name, dataset.recursive)
111 {
112 tracing::error!(
113 tag = schedule.tag,
114 dataset = dataset.name,
115 "failed to create snapshot: {:#}",
116 err
117 );
118 }
119
120 if let Err(err) = zfs::snapshot_prune(
121 &schedule.tag,
122 &dataset.name,
123 dataset.recursive,
124 schedule.keep,
125 ) {
126 tracing::error!(
127 tag = schedule.tag,
128 dataset = dataset.name,
129 "failed to prune snapshots: {:#}",
130 err
131 );
132 }
133 }
134 }
135}
diff --git a/src/zfs.rs b/src/zfs.rs
new file mode 100644
index 0000000..380efa6
--- /dev/null
+++ b/src/zfs.rs
@@ -0,0 +1,87 @@
1use std::process::Command;
2
3use eyre::{Context, Result};
4
5const PROPERTY_TAG: &str = "zsnap:tag";
6
7#[derive(Debug)]
8struct ZfsSnapshot {
9 name: String,
10 dataset: String,
11 time: chrono::DateTime<chrono::Utc>,
12 tag: String,
13}
14
15pub fn snapshot_create(tag: &str, dataset: &str, recursive: bool) -> Result<()> {
16 let time = chrono::Utc::now();
17 let name = format!("{}@{}", dataset, time.format("zsnap_%Y-%m-%d_%H-%M-%S"));
18 let rec = if recursive { "-r" } else { "" };
19 let cmd = format!("zfs snapshot -o {PROPERTY_TAG}={tag} {rec} {name}");
20 let _output = run_shell_command(&cmd)?;
21 Ok(())
22}
23
24pub fn snapshot_prune(tag: &str, dataset: &str, recursive: bool, keep: usize) -> Result<()> {
25 let mut snapshots = zfs_snapshot_list()?
26 .into_iter()
27 .filter(|s| s.dataset == dataset && s.tag == tag)
28 .collect::<Vec<_>>();
29 snapshots.sort_by_key(|s| s.time);
30 snapshots.reverse();
31 tracing::trace!("snapshots for dataset '{dataset}': {snapshots:?}");
32 tracing::trace!("skipping {keep} snapshots");
33
34 for snapshot in snapshots.into_iter().skip(keep) {
35 tracing::debug!(name = snapshot.name.as_str(), "destroying snapshot");
36 let rec = if recursive { "-r" } else { "" };
37 let cmd = format!("zfs destroy {} {}", rec, snapshot.name);
38 let _output = run_shell_command(&cmd)?;
39 }
40
41 Ok(())
42}
43
44fn zfs_snapshot_list() -> Result<Vec<ZfsSnapshot>> {
45 fn parse_line(line: &str) -> Option<ZfsSnapshot> {
46 let mut parts = line.split('\t');
47 let name = parts.next()?;
48 let tag = parts.next()?;
49
50 let mut parts = name.split('@');
51 let dataset = parts.next()?;
52 let time = parts.next()?;
53 let time = chrono::NaiveDateTime::parse_from_str(time, "zsnap_%Y-%m-%d_%H-%M-%S").ok()?;
54
55 if tag == "-" {
56 return None;
57 }
58
59 Some(ZfsSnapshot {
60 name: name.to_string(),
61 dataset: dataset.to_string(),
62 time: time.and_utc(),
63 tag: tag.to_string(),
64 })
65 }
66
67 let output = run_shell_command(&format!("zfs list -H -t snapshot -o name,{PROPERTY_TAG}"))?;
68 Ok(output.lines().filter_map(parse_line).collect())
69}
70
71fn run_shell_command(cmd: &str) -> Result<String> {
72 tracing::debug!("running shell command '{cmd}'");
73 let output = Command::new("/bin/sh")
74 .arg("-c")
75 .arg(cmd)
76 .output()
77 .with_context(|| format!("running shell command '{cmd}'"))?;
78 if !output.status.success() {
79 let stderr = String::from_utf8(output.stderr).context("converting shell output to utf8")?;
80 let stderr = stderr.trim();
81 tracing::error!("shell command failed: '{stderr}'");
82 return Err(eyre::eyre!("shell command failed: '{stderr}'"));
83 }
84 let output = String::from_utf8(output.stdout).context("converting shell output to utf8")?;
85 tracing::trace!("shell command output: '{output}'");
86 Ok(output)
87}
generated by cgit (git 2.34.1) at 2026-04-05 18:32:25 +0000