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

2 files changed, 7 insertions, 9 deletions

diff --git a/src/rpc/Cargo.toml b/src/rpc/Cargo.toml
index 80a1975c..21841a02 100644
--- a/src/rpc/Cargo.toml
+++ b/src/rpc/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "garage_rpc"
-version = "0.7.0"
+version = "0.8.0"
 authors = ["Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license = "AGPL-3.0"
@@ -14,7 +14,7 @@ path = "lib.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-garage_util = { version = "0.7.0", path = "../util" }
+garage_util = { version = "0.8.0", path = "../util" }
 
 arc-swap = "1.0"
 bytes = "1.0"
@@ -54,3 +54,4 @@ hyper = { version = "0.14", features = ["client", "http1", "runtime", "tcp"] }
 
 [features]
 kubernetes-discovery = [ "kube", "k8s-openapi", "openssl", "schemars" ]
+system-libs = [ "sodiumoxide/use-pkg-config" ]
diff --git a/src/rpc/system.rs b/src/rpc/system.rs
index fbfbbf56..d621f59f 100644
--- a/src/rpc/system.rs
+++ b/src/rpc/system.rs
@@ -27,7 +27,6 @@ use garage_util::data::*;
 use garage_util::error::*;
 use garage_util::persister::Persister;
 use garage_util::time::*;
-use garage_util::version;
 
 use crate::consul::*;
 #[cfg(feature = "kubernetes-discovery")]
@@ -40,8 +39,10 @@ const DISCOVERY_INTERVAL: Duration = Duration::from_secs(60);
 const STATUS_EXCHANGE_INTERVAL: Duration = Duration::from_secs(10);
 const PING_TIMEOUT: Duration = Duration::from_secs(2);
 
-/// Version tag used for version check upon Netapp connection
-pub const GARAGE_VERSION_TAG: u64 = 0x6761726167650007; // garage 0x0007
+/// Version tag used for version check upon Netapp connection.
+/// Cluster nodes with different version tags are deemed
+/// incompatible and will refuse to connect.
+pub const GARAGE_VERSION_TAG: u64 = 0x6761726167650008; // garage 0x0008
 
 /// RPC endpoint used for calls related to membership
 pub const SYSTEM_RPC_PATH: &str = "garage_rpc/membership.rs/SystemRpc";
@@ -320,10 +321,6 @@ impl System {
 	// ---- Administrative operations (directly available and
 	//      also available through RPC) ----
 
-	pub fn garage_version(&self) -> &'static str {
-		version::garage()
-	}
-
 	pub fn get_known_nodes(&self) -> Vec<KnownNodeInfo> {
 		let node_status = self.node_status.read().unwrap();
 		let known_nodes = self