Merge branch 'main' into next-0.10

5 files changed, 112 insertions, 30 deletions

diff --git a/src/block/layout.rs b/src/block/layout.rs
index e8339405..e78f3f08 100644
--- a/src/block/layout.rs
+++ b/src/block/layout.rs
@@ -1,3 +1,4 @@
+use std::collections::HashMap;
 use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
@@ -13,9 +14,12 @@ const DRIVE_NPART: usize = 1024;
 
 const HASH_DRIVE_BYTES: (usize, usize) = (2, 3);
 
+const MARKER_FILE_NAME: &str = "garage-marker";
+
 #[derive(Serialize, Deserialize, Debug, Clone)]
 pub(crate) struct DataLayout {
 	pub(crate) data_dirs: Vec<DataDir>,
+	markers: HashMap<PathBuf, String>,
 
 	/// Primary storage location (index in data_dirs) for each partition
 	/// = the location where the data is supposed to be, blocks are always
@@ -75,16 +79,17 @@ impl DataLayout {
 
 		Ok(Self {
 			data_dirs,
+			markers: HashMap::new(),
 			part_prim,
 			part_sec,
 		})
 	}
 
-	pub(crate) fn update(&mut self, dirs: &DataDirEnum) -> Result<(), Error> {
+	pub(crate) fn update(self, dirs: &DataDirEnum) -> Result<Self, Error> {
 		// Make list of new data directories, exit if nothing changed
 		let data_dirs = make_data_dirs(dirs)?;
 		if data_dirs == self.data_dirs {
-			return Ok(());
+			return Ok(self);
 		}
 
 		let total_cap = data_dirs.iter().filter_map(|x| x.capacity()).sum::<u64>();
@@ -214,11 +219,43 @@ impl DataLayout {
 		}
 
 		// Apply newly generated config
-		*self = Self {
+		Ok(Self {
 			data_dirs,
+			markers: self.markers,
 			part_prim,
 			part_sec,
-		};
+		})
+	}
+
+	pub(crate) fn check_markers(&mut self) -> Result<(), Error> {
+		let data_dirs = &self.data_dirs;
+		self.markers
+			.retain(|k, _| data_dirs.iter().any(|x| x.path == *k));
+
+		for dir in self.data_dirs.iter() {
+			let mut marker_path = dir.path.clone();
+			marker_path.push(MARKER_FILE_NAME);
+			let existing_marker = std::fs::read_to_string(&marker_path).ok();
+			match (existing_marker, self.markers.get(&dir.path)) {
+				(Some(m1), Some(m2)) => {
+					if m1 != *m2 {
+						return Err(Error::Message(format!("Mismatched content for marker file `{}` in data directory `{}`. If you moved data directories or changed their mountpoints, you should remove the `data_layout` file in Garage's metadata directory and restart Garage.", MARKER_FILE_NAME, dir.path.display())));
+					}
+				}
+				(None, Some(_)) => {
+					return Err(Error::Message(format!("Could not find expected marker file `{}` in data directory `{}`, make sure this data directory is mounted correctly.", MARKER_FILE_NAME, dir.path.display())));
+				}
+				(Some(mkr), None) => {
+					self.markers.insert(dir.path.clone(), mkr);
+				}
+				(None, None) => {
+					let mkr = hex::encode(garage_util::data::gen_uuid().as_slice());
+					std::fs::write(&marker_path, &mkr)?;
+					self.markers.insert(dir.path.clone(), mkr);
+				}
+			}
+		}
+
 		Ok(())
 	}
 
@@ -255,6 +292,7 @@ impl DataLayout {
 	pub(crate) fn without_secondary_locations(&self) -> Self {
 		Self {
 			data_dirs: self.data_dirs.clone(),
+			markers: self.markers.clone(),
 			part_prim: self.part_prim.clone(),
 			part_sec: self.part_sec.iter().map(|_| vec![]).collect::<Vec<_>>(),
 		}
@@ -322,14 +360,12 @@ fn make_data_dirs(dirs: &DataDirEnum) -> Result<Vec<DataDir>, Error> {
 fn dir_not_empty(path: &PathBuf) -> Result<bool, Error> {
 	for entry in std::fs::read_dir(&path)? {
 		let dir = entry?;
-		if dir.file_type()?.is_dir()
-			&& dir
-				.file_name()
-				.into_string()
-				.ok()
-				.and_then(|hex| hex::decode(&hex).ok())
-				.is_some()
-		{
+		let ft = dir.file_type()?;
+		let name = dir.file_name().into_string().ok();
+		if ft.is_file() && name.as_deref() == Some(MARKER_FILE_NAME) {
+			return Ok(true);
+		}
+		if ft.is_dir() && name.and_then(|hex| hex::decode(&hex).ok()).is_some() {
 			return Ok(true);
 		}
 	}
diff --git a/src/block/manager.rs b/src/block/manager.rs
index 8ee33096..82db2cab 100644
--- a/src/block/manager.rs
+++ b/src/block/manager.rs
@@ -127,17 +127,15 @@ impl BlockManager {
 		// Load or compute layout, i.e. assignment of data blocks to the different data directories
 		let data_layout_persister: Persister<DataLayout> =
 			Persister::new(&system.metadata_dir, "data_layout");
-		let data_layout = match data_layout_persister.load() {
-			Ok(mut layout) => {
-				layout
-					.update(&config.data_dir)
-					.ok_or_message("invalid data_dir config")?;
-				layout
-			}
+		let mut data_layout = match data_layout_persister.load() {
+			Ok(layout) => layout
+				.update(&config.data_dir)
+				.ok_or_message("invalid data_dir config")?,
 			Err(_) => {
 				DataLayout::initialize(&config.data_dir).ok_or_message("invalid data_dir config")?
 			}
 		};
+		data_layout.check_markers()?;
 		data_layout_persister
 			.save(&data_layout)
 			.expect("cannot save data_layout");
diff --git a/src/garage/Cargo.toml b/src/garage/Cargo.toml
index 17da68f8..a4acbb1f 100644
--- a/src/garage/Cargo.toml
+++ b/src/garage/Cargo.toml
@@ -59,6 +59,7 @@ opentelemetry.workspace = true
 opentelemetry-prometheus = { workspace = true, optional = true }
 opentelemetry-otlp = { workspace = true, optional = true }
 prometheus = { workspace = true, optional = true }
+syslog-tracing = { workspace = true, optional = true }
 
 [dev-dependencies]
 aws-config.workspace = true
@@ -97,6 +98,8 @@ kubernetes-discovery = [ "garage_rpc/kubernetes-discovery" ]
 metrics = [ "garage_api/metrics", "opentelemetry-prometheus", "prometheus" ]
 # Exporter for the OpenTelemetry Collector.
 telemetry-otlp = [ "opentelemetry-otlp" ]
+# Logging to syslog
+syslog = [ "syslog-tracing" ]
 
 # NOTE: bundled-libs and system-libs should be treat as mutually exclusive;
 # exactly one of them should be enabled.
diff --git a/src/garage/main.rs b/src/garage/main.rs
index 5e9c061f..92fd4d0c 100644
--- a/src/garage/main.rs
+++ b/src/garage/main.rs
@@ -138,17 +138,8 @@ async fn main() {
 	let opt = Opt::from_clap(&Opt::clap().version(version.as_str()).get_matches());
 
 	// Initialize logging as well as other libraries used in Garage
-	if std::env::var("RUST_LOG").is_err() {
-		let default_log = match &opt.cmd {
-			Command::Server => "netapp=info,garage=info",
-			_ => "netapp=warn,garage=warn",
-		};
-		std::env::set_var("RUST_LOG", default_log)
-	}
-	tracing_subscriber::fmt()
-		.with_writer(std::io::stderr)
-		.with_env_filter(tracing_subscriber::filter::EnvFilter::from_default_env())
-		.init();
+	init_logging(&opt);
+
 	sodiumoxide::init().expect("Unable to init sodiumoxide");
 
 	let res = match opt.cmd {
@@ -171,6 +162,58 @@ async fn main() {
 	}
 }
 
+fn init_logging(opt: &Opt) {
+	if std::env::var("RUST_LOG").is_err() {
+		let default_log = match &opt.cmd {
+			Command::Server => "netapp=info,garage=info",
+			_ => "netapp=warn,garage=warn",
+		};
+		std::env::set_var("RUST_LOG", default_log)
+	}
+
+	let env_filter = tracing_subscriber::filter::EnvFilter::from_default_env();
+
+	if std::env::var("GARAGE_LOG_TO_SYSLOG")
+		.map(|x| x == "1" || x == "true")
+		.unwrap_or(false)
+	{
+		#[cfg(feature = "syslog")]
+		{
+			use std::ffi::CStr;
+			use syslog_tracing::{Facility, Options, Syslog};
+
+			let syslog = Syslog::new(
+				CStr::from_bytes_with_nul(b"garage\0").unwrap(),
+				Options::LOG_PID | Options::LOG_PERROR,
+				Facility::Daemon,
+			)
+			.expect("Unable to init syslog");
+
+			tracing_subscriber::fmt()
+				.with_writer(syslog)
+				.with_env_filter(env_filter)
+				.with_ansi(false) // disable ANSI escape sequences (colours)
+				.with_file(false)
+				.with_level(false)
+				.without_time()
+				.compact()
+				.init();
+
+			return;
+		}
+		#[cfg(not(feature = "syslog"))]
+		{
+			eprintln!("Syslog support is not enabled in this build.");
+			std::process::exit(1);
+		}
+	}
+
+	tracing_subscriber::fmt()
+		.with_writer(std::io::stderr)
+		.with_env_filter(env_filter)
+		.init();
+}
+
 async fn cli_command(opt: Opt) -> Result<(), Error> {
 	let config = if (opt.secrets.rpc_secret.is_none() && opt.secrets.rpc_secret_file.is_none())
 		|| opt.rpc_host.is_none()
diff --git a/src/garage/tests/k2v/poll.rs b/src/garage/tests/k2v/poll.rs
index 277f8bc8..7c06cea9 100644
--- a/src/garage/tests/k2v/poll.rs
+++ b/src/garage/tests/k2v/poll.rs
@@ -10,6 +10,7 @@ use crate::common;
 use crate::json_body;
 
 #[tokio::test]
+#[ignore = "currently broken"]
 async fn test_poll_item() {
 	let ctx = common::context();
 	let bucket = ctx.create_bucket("test-k2v-poll-item");
@@ -98,6 +99,7 @@ async fn test_poll_item() {
 }
 
 #[tokio::test]
+#[ignore = "currently broken"]
 async fn test_poll_range() {
 	let ctx = common::context();
 	let bucket = ctx.create_bucket("test-k2v-poll-range");