fix: displaydoc

Uses `displaydoc` to derive error messages from doc comments to reduce
duplication.

Signed-off-by: Jonathan Woollett-Light <[email protected]>

src/api_server/Cargo.toml

@@ -14,6 +14,7 @@ serde = { version = "1.0.136", features = ["derive"] }
 serde_derive = "1.0.136"
 serde_json = "1.0.78"
 thiserror = "1.0.32"
+displaydoc = "0.2.4"
 
 logger = { path = "../logger" }
 micro_http = { git = "https://github.com/firecracker-microvm/micro-http" }

src/cpu-template-helper/Cargo.toml

@@ -13,6 +13,7 @@ bench = false
 
 [dependencies]
 clap = { version = "4.4.4", features = ["derive", "string"] }
+displaydoc = "0.2.4"
 libc = "0.2.148"
 serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.107"

src/cpu-template-helper/src/fingerprint/compare.rs

@@ -5,13 +5,11 @@ use serde::Serialize;
 
 use crate::fingerprint::{Fingerprint, FingerprintField};
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum FingerprintCompareError {
-    /// Difference detected between source and target.
-    #[error("Difference detected between source and target:\n{0}")]
+    /// Difference detected between source and target:\n{0}
     DiffDetected(String),
-    /// Failed to serialize/deserialize JSON.
-    #[error("Failed to serialize/deserialize JSON: {0}")]
+    /// Failed to serialize/deserialize JSON: {0}
     Serde(#[from] serde_json::Error),
 }
 

src/cpu-template-helper/src/fingerprint/dump.rs

@@ -8,19 +8,15 @@ use vmm::Vmm;
 
 use crate::fingerprint::Fingerprint;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum FingerprintDumpError {
-    /// Failed to dump CPU configuration.
-    #[error("Failed to dump CPU config: {0}")]
+    /// Failed to dump CPU config: {0}
     DumpCpuConfig(#[from] crate::template::dump::DumpError),
-    /// Failed to read sysfs file.
-    #[error("Failed to read {0}: {1}")]
+    /// Failed to read {0}: {1}
     ReadSysfsFile(String, std::io::Error),
-    /// Failed to get kernel version.
-    #[error("Failed to get kernel version: {0}")]
+    /// Failed to get kernel version: {0}
     GetKernelVersion(std::io::Error),
-    /// Shell command failed.
-    #[error("`{0}` failed: {1}")]
+    /// `{0}` failed: {1}
     ShellCommand(String, String),
 }
 

src/cpu-template-helper/src/main.rs

@@ -13,25 +13,25 @@ mod fingerprint;
 mod template;
 mod utils;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 enum HelperError {
-    #[error("Failed to operate file: {0}")]
+    /// Failed to operate file: {0}
     FileIo(#[from] std::io::Error),
-    #[error("{0}")]
+    /// {0}
     FingerprintCompare(#[from] fingerprint::compare::FingerprintCompareError),
-    #[error("{0}")]
+    /// {0}
     FingerprintDump(#[from] fingerprint::dump::FingerprintDumpError),
-    #[error("CPU template is not specified: {0}")]
+    /// CPU template is not specified: {0}
     NoCpuTemplate(#[from] GetCpuTemplateError),
-    #[error("Failed to serialize/deserialize JSON file: {0}")]
+    /// Failed to serialize/deserialize JSON file: {0}
     Serde(#[from] serde_json::Error),
-    #[error("{0}")]
+    /// {0}
     Utils(#[from] UtilsError),
-    #[error("{0}")]
+    /// {0}
     TemplateDump(#[from] template::dump::DumpError),
-    #[error("{0}")]
+    /// {0}
     TemplateStrip(#[from] template::strip::StripError),
-    #[error("{0}")]
+    /// {0}
     TemplateVerify(#[from] template::verify::VerifyError),
 }
 

src/cpu-template-helper/src/template/dump/mod.rs

@@ -16,10 +16,9 @@ use crate::template::dump::aarch64::config_to_template;
 #[cfg(target_arch = "x86_64")]
 use crate::template::dump::x86_64::config_to_template;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum DumpError {
-    /// Failed to dump CPU configuration.
-    #[error("Failed to dump CPU config: {0}")]
+    /// Failed to dump CPU config: {0}
     DumpCpuConfig(#[from] DumpCpuConfigError),
 }
 

src/cpu-template-helper/src/template/strip/mod.rs

@@ -18,10 +18,9 @@ mod x86_64;
 #[cfg(target_arch = "x86_64")]
 pub use x86_64::strip;
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum StripError {
     /// The number of inputs should be two or more.
-    #[error("The number of inputs should be two or more.")]
     NumberOfInputs,
 }
 

src/cpu-template-helper/src/template/verify/mod.rs

@@ -18,11 +18,12 @@ mod x86_64;
 pub use x86_64::verify;
 
 #[rustfmt::skip]
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum VerifyError {
-    #[error("{0} not found in CPU configuration.")]
+    /// {0} not found in CPU configuration.
     KeyNotFound(String),
-    #[error("Value for {0} mismatched.\n{1}")]
+    #[rustfmt::skip]
+    #[doc = "Value for {0} mismatched.\n{1}"]
     ValueMismatched(String, String),
 }
 

src/cpu-template-helper/src/utils/mod.rs

@@ -58,13 +58,11 @@ impl<V: Numeric> DiffString<V> for V {
     }
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum UtilsError {
-    /// Failed to create VmResources.
-    #[error("Failed to create VmResources: {0}")]
+    /// Failed to create VmResources: {0}
     CreateVmResources(vmm::resources::ResourcesError),
-    /// Failed to build microVM.
-    #[error("Failed to build microVM: {0}")]
+    /// Failed to build microVM: {0}
     BuildMicroVm(#[from] StartMicrovmError),
 }
 

src/firecracker/Cargo.toml

@@ -13,6 +13,7 @@ name = "firecracker"
 bench = false
 
 [dependencies]
+displaydoc = "0.2.4"
 event-manager = "0.3.0"
 libc = "0.2.148"
 serde_json = "1.0.107"

src/firecracker/src/api_server_adapter.rs

@@ -20,17 +20,17 @@ use vmm::rpc_interface::{
 use vmm::vmm_config::instance_info::InstanceInfo;
 use vmm::{EventManager, FcExitCode, Vmm};
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum ApiServerError {
-    #[error("MicroVMStopped without an error: {0:?}")]
+    /// MicroVMStopped without an error: {0:?}
     MicroVMStoppedWithoutError(FcExitCode),
-    #[error("MicroVMStopped with an error: {0:?}")]
+    /// MicroVMStopped with an error: {0:?}
     MicroVMStoppedWithError(FcExitCode),
-    #[error("Failed to open the API socket at: {0}. Check that it is not already used.")]
+    /// Failed to open the API socket at: {0}. Check that it is not already used.
     FailedToBindSocket(String),
-    #[error("Failed to bind and run the HTTP server: {0}")]
+    /// Failed to bind and run the HTTP server: {0}
     FailedToBindAndRunHttpServer(ServerError),
-    #[error("Failed to build MicroVM from Json: {0}")]
+    /// Failed to build MicroVM from Json: {0}
     BuildFromJson(crate::BuildFromJsonError),
 }
 

src/firecracker/src/main.rs

@@ -39,37 +39,37 @@ const DEFAULT_INSTANCE_ID: &str = "anonymous-instance";
 const FIRECRACKER_VERSION: &str = env!("FIRECRACKER_VERSION");
 const MMDS_CONTENT_ARG: &str = "metadata";
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 enum MainError {
-    #[error("Failed to register signal handlers: {0}")]
+    /// Failed to register signal handlers: {0}
     RegisterSignalHandlers(#[source] utils::errno::Error),
-    #[error("Arguments parsing error: {0} \n\nFor more information try --help.")]
+    /// Arguments parsing error: {0} \n\nFor more information try --help.
     ParseArguments(#[from] utils::arg_parser::Error),
-    #[error("When printing Snapshot Data format: {0}")]
+    /// When printing Snapshot Data format: {0}
     PrintSnapshotDataFormat(#[from] SnapshotVersionError),
-    #[error("Invalid value for logger level: {0}.Possible values: [Error, Warning, Info, Debug]")]
+    /// Invalid value for logger level: {0}.Possible values: [Error, Warning, Info, Debug]
     InvalidLogLevel(LoggerConfigError),
-    #[error("Could not initialize logger: {0}")]
+    /// Could not initialize logger: {0}
     LoggerInitialization(LoggerConfigError),
-    #[error("Could not initialize metrics: {0:?}")]
+    /// Could not initialize metrics: {0:?}
     MetricsInitialization(MetricsConfigError),
-    #[error("Seccomp error: {0}")]
+    /// Seccomp error: {0}
     SeccompFilter(FilterError),
-    #[error("Failed to resize fd table: {0}")]
+    /// Failed to resize fd table: {0}
     ResizeFdtable(ResizeFdTableError),
-    #[error("RunWithApiError error: {0}")]
+    /// RunWithApiError error: {0}
     RunWithApi(ApiServerError),
-    #[error("RunWithoutApiError error: {0}")]
+    /// RunWithoutApiError error: {0}
     RunWithoutApiError(RunWithoutApiError),
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 enum ResizeFdTableError {
-    #[error("Failed to get RLIMIT_NOFILE")]
+    /// Failed to get RLIMIT_NOFILE
     GetRlimit,
-    #[error("Failed to call dup2 to resize fdtable")]
+    /// Failed to call dup2 to resize fdtable
     Dup2(io::Error),
-    #[error("Failed to close dup2'd file descriptor")]
+    /// Failed to close dup2'd file descriptor
     Close(io::Error),
 }
 
@@ -524,13 +524,13 @@ fn print_supported_snapshot_versions() {
     }
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 enum SnapshotVersionError {
-    #[error("Unable to open snapshot state file: {0}")]
+    /// Unable to open snapshot state file: {0}
     OpenSnapshot(io::Error),
-    #[error("Invalid data format version of snapshot file: {0}")]
+    /// Invalid data format version of snapshot file: {0}
     SnapshotVersion(SnapshotError),
-    #[error("Cannot translate snapshot data version {0} to Firecracker microVM version")]
+    /// Cannot translate snapshot data version {0} to Firecracker microVM version
     FirecrackerVersion(u16),
 }
 
@@ -551,11 +551,11 @@ fn print_snapshot_data_format(snapshot_path: &str) -> Result<(), SnapshotVersion
     Ok(())
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 pub enum BuildFromJsonError {
-    #[error("Configuration for VMM from one single json failed: {0}")]
+    /// Configuration for VMM from one single json failed: {0}
     ParseFromJson(vmm::resources::ResourcesError),
-    #[error("Could not Start MicroVM from one single json: {0}")]
+    /// Could not Start MicroVM from one single json: {0}
     StartMicroVM(StartMicrovmError),
 }
 
@@ -586,11 +586,11 @@ fn build_microvm_from_json(
     Ok((vm_resources, vmm))
 }
 
-#[derive(Debug, thiserror::Error)]
+#[derive(Debug, thiserror::Error, displaydoc::Display)]
 enum RunWithoutApiError {
-    #[error("MicroVMStopped without an error: {0:?}")]
+    /// MicroVMStopped without an error: {0:?}
     Shutdown(FcExitCode),
-    #[error("Failed to build MicroVM from Json: {0}")]
+    /// Failed to build MicroVM from Json: {0}
     BuildMicroVMFromJson(BuildFromJsonError),
 }