Merge pull request 'Reorganize dependencies' (#373) from improve-deps into main

This PR includes work from @jirutka :

- [x] Allow linking against system-provided libraries (libsodium, libsqlite, libzstd) #370
- [x] Make OTLP exporter optional and allow building without Prometheus exporter (/metrics) #372

And also:

- [x] Update `.nix` files
- [x] Remove heed default-features
- [x] Bump versions of all Garage crates to 0.8.0
- [x] Make db engines (lmdb, sled, sqlite) optionnal
- [x] Add documentation for available features
- [x] Directly include code of previous versions used for migration in order to reduce dependencies
- [x] Read variable `GIT_VERSION` from garage main instead of in crate garage_util to make builds faster
- [x] Report features used in the build somewhere? (in `garage --version` or something)
- [x] Check we `warn!` correctly if we try to use deactivated feature
- [x] Allow not to launch S3 endpoint if not in config

Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/373

3 files changed, 30 insertions, 9 deletions

diff --git a/src/util/Cargo.toml b/src/util/Cargo.toml
index 783fb3fc..163c1b77 100644
--- a/src/util/Cargo.toml
+++ b/src/util/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "garage_util"
-version = "0.7.0"
+version = "0.8.0"
 authors = ["Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license = "AGPL-3.0"
@@ -16,15 +16,17 @@ path = "lib.rs"
 [dependencies]
 garage_db = { version = "0.8.0", path = "../db" }
 
+arc-swap = "1.0"
 async-trait = "0.1"
 blake2 = "0.9"
 err-derive = "0.3"
+git-version = "0.3.4"
 xxhash-rust = { version = "0.8", default-features = false, features = ["xxh3"] }
 hex = "0.4"
+lazy_static = "1.4"
 tracing = "0.1.30"
 rand = "0.8"
 sha2 = "0.9"
-git-version = "0.3.4"
 
 chrono = "0.4"
 rmp-serde = "0.15"
diff --git a/src/util/config.rs b/src/util/config.rs
index a2bb8fb3..cccad101 100644
--- a/src/util/config.rs
+++ b/src/util/config.rs
@@ -77,11 +77,10 @@ pub struct Config {
 	pub s3_api: S3ApiConfig,
 
 	/// Configuration for K2V api
-	#[cfg(feature = "k2v")]
 	pub k2v_api: Option<K2VApiConfig>,
 
 	/// Configuration for serving files as normal web server
-	pub s3_web: WebConfig,
+	pub s3_web: Option<WebConfig>,
 
 	/// Configuration for the admin API endpoint
 	#[serde(default = "Default::default")]
@@ -92,7 +91,7 @@ pub struct Config {
 #[derive(Deserialize, Debug, Clone)]
 pub struct S3ApiConfig {
 	/// Address and port to bind for api serving
-	pub api_bind_addr: SocketAddr,
+	pub api_bind_addr: Option<SocketAddr>,
 	/// S3 region to use
 	pub s3_region: String,
 	/// Suffix to remove from domain name to find bucket. If None,
@@ -101,7 +100,6 @@ pub struct S3ApiConfig {
 }
 
 /// Configuration for K2V api
-#[cfg(feature = "k2v")]
 #[derive(Deserialize, Debug, Clone)]
 pub struct K2VApiConfig {
 	/// Address and port to bind for api serving
diff --git a/src/util/version.rs b/src/util/version.rs
index 8882d035..b515dccc 100644
--- a/src/util/version.rs
+++ b/src/util/version.rs
@@ -1,7 +1,28 @@
-pub fn garage() -> &'static str {
-	option_env!("GIT_VERSION").unwrap_or(git_version::git_version!(
+use std::sync::Arc;
+
+use arc_swap::{ArcSwap, ArcSwapOption};
+
+lazy_static::lazy_static! {
+	static ref VERSION: ArcSwap<&'static str> = ArcSwap::new(Arc::new(git_version::git_version!(
 		prefix = "git:",
 		cargo_prefix = "cargo:",
 		fallback = "unknown"
-	))
+	)));
+	static ref FEATURES: ArcSwapOption<&'static [&'static str]> = ArcSwapOption::new(None);
+}
+
+pub fn garage_version() -> &'static str {
+	&VERSION.load()
+}
+
+pub fn garage_features() -> Option<&'static [&'static str]> {
+	FEATURES.load().as_ref().map(|f| &f[..])
+}
+
+pub fn init_version(version: &'static str) {
+	VERSION.store(Arc::new(version));
+}
+
+pub fn init_features(features: &'static [&'static str]) {
+	FEATURES.store(Some(Arc::new(features)));
 }