feat(cli): Allow building without self-update feature

Cargo.toml

@@ -31,9 +31,10 @@ description = { workspace = true }
 members = ["crates/rustic_testing", "xtask"]
 
 [features]
-default = []
+default = ["self-update"]
 mimalloc = ["dep:mimalloc"]
 jemallocator = ["dep:jemallocator-global"]
+self-update = ["dep:self_update", "dep:semver"]
 
 [[bin]]
 name = "rustic"
@@ -67,8 +68,8 @@ serde_with = { workspace = true }
 
 # other dependencies
 chrono = { workspace = true }
-self_update = { workspace = true }
-semver = { workspace = true }
+self_update = { workspace = true, optional = true }
+semver = { workspace = true, optional = true }
 
 # commands
 clap = { workspace = true }

src/commands.rs

@@ -108,6 +108,7 @@ enum RusticCmd {
     ShowConfig(ShowConfigCmd),
 
     /// Update to the latest rustic release
+    #[cfg_attr(not(feature = "self-update"), clap(hide = true))]
     SelfUpdate(SelfUpdateCmd),
 
     /// Remove unused data or repack repository pack files

src/commands/self_update.rs

@@ -5,8 +5,6 @@ use crate::{Application, RUSTIC_APP};
 use abscissa_core::{status_err, Command, Runnable, Shutdown};
 
 use anyhow::Result;
-use self_update::cargo_crate_version;
-use semver::Version;
 
 /// `self-update` subcommand
 #[derive(clap::Parser, Command, Debug)]
@@ -26,8 +24,11 @@ impl Runnable for SelfUpdateCmd {
 }
 
 impl SelfUpdateCmd {
+    #[cfg(feature = "self-update")]
     fn inner_run(&self) -> Result<()> {
-        let current_version = Version::parse(cargo_crate_version!())?;
+        use semver::Version;
+
+        let current_version = Version::parse(self_update::cargo_crate_version!())?;
 
         let release = self_update::backends::github::Update::configure()
             .repo_owner("rustic-rs")
@@ -62,4 +63,10 @@ impl SelfUpdateCmd {
 
         Ok(())
     }
+    #[cfg(not(feature = "self-update"))]
+    fn inner_run(&self) -> Result<()> {
+        anyhow::bail!(
+            "This version of rustic was built without the \"self-update\" feature. Please use your system package manager to update it."
+        );
+    }
 }