refactor: replace use of anyhow with custom types in library part

4 files changed, 46 insertions, 10 deletions

diff --git a/src/cmd/cloud_init.rs b/src/cmd/cloud_init.rs
index 3ab4139..615b2a8 100644
--- a/src/cmd/cloud_init.rs
+++ b/src/cmd/cloud_init.rs
@@ -1,9 +1,18 @@
-use crate::cloudinit::CloudInitConfig;
+use crate::cloudinit::{CloudInitConfig, CloudInitError};
 use crate::spec::Specification;
 use log::{debug, info};
 use std::path::Path;
 
-pub fn cloud_init(spec: &Specification, dirname: &Path) -> anyhow::Result<()> {
+#[derive(Debug, thiserror::Error)]
+pub enum CloudInitCommandError {
+    #[error(transparent)]
+    CloudInitError(#[from] CloudInitError),
+
+    #[error(transparent)]
+    IoError(#[from] std::io::Error),
+}
+
+pub fn cloud_init(spec: &Specification, dirname: &Path) -> Result<(), CloudInitCommandError> {
     info!(
         "generating cloud-init configuration into {}",
         dirname.display()
@@ -18,7 +27,7 @@ pub fn cloud_init(spec: &Specification, dirname: &Path) -> anyhow::Result<()> {
     Ok(())
 }
 
-pub fn cloud_init_iso(spec: &Specification, iso: &Path) -> anyhow::Result<()> {
+pub fn cloud_init_iso(spec: &Specification, iso: &Path) -> Result<(), CloudInitCommandError> {
     info!("generating cloud-init ISO into {}", iso.display());
 
     let init = CloudInitConfig::from(&spec)?;
diff --git a/src/cmd/delete.rs b/src/cmd/delete.rs
index ee8f0e9..ac8c5b4 100644
--- a/src/cmd/delete.rs
+++ b/src/cmd/delete.rs
@@ -4,7 +4,16 @@ use std::thread;
 use std::time::Duration;
 use virt::connect::Connect;
 
-pub fn delete(spec: &Specification) -> anyhow::Result<()> {
+#[derive(Debug, thiserror::Error)]
+pub enum DeleteError {
+    #[error(transparent)]
+    VirtError(#[from] virt::error::Error),
+
+    #[error(transparent)]
+    IoError(#[from] std::io::Error),
+}
+
+pub fn delete(spec: &Specification) -> Result<(), DeleteError> {
     info!("deleting virtual machine {}", spec.name);
 
     debug!("connecting to libvirtd");
diff --git a/src/cmd/list.rs b/src/cmd/list.rs
index e58db3d..a67dfb7 100644
--- a/src/cmd/list.rs
+++ b/src/cmd/list.rs
@@ -2,7 +2,13 @@ use crate::config::Configuration;
 
 use virt::connect::Connect;
 
-pub fn list(_config: &Configuration) -> anyhow::Result<()> {
+#[derive(Debug, thiserror::Error)]
+pub enum ListError {
+    #[error(transparent)]
+    VirtError(#[from] virt::error::Error),
+}
+
+pub fn list(_config: &Configuration) -> Result<(), ListError> {
     let conn = Connect::open("qemu:///system")?;
     let domains = conn.list_all_domains(0)?;
     for domain in domains {
diff --git a/src/cmd/new.rs b/src/cmd/new.rs
index 9930379..0a4b3ab 100644
--- a/src/cmd/new.rs
+++ b/src/cmd/new.rs
@@ -1,6 +1,6 @@
-use crate::cloudinit::CloudInitConfig;
-use crate::image::VirtualMachineImage;
-use crate::install::{virt_install, VirtInstallArgs};
+use crate::cloudinit::{CloudInitConfig, CloudInitError};
+use crate::image::{ImageError, VirtualMachineImage};
+use crate::install::{virt_install, VirtInstallArgs, VirtInstallError};
 use crate::spec::Specification;
 
 use bytesize::GIB;
@@ -9,7 +9,19 @@ use std::net::TcpStream;
 
 const SSH_PORT: i32 = 22;
 
-pub fn new(spec: &Specification) -> anyhow::Result<()> {
+#[derive(Debug, thiserror::Error)]
+pub enum NewError {
+    #[error(transparent)]
+    CloudInitError(#[from] CloudInitError),
+
+    #[error(transparent)]
+    ImageError(#[from] ImageError),
+
+    #[error(transparent)]
+    VirtInstallError(#[from] VirtInstallError),
+}
+
+pub fn new(spec: &Specification) -> Result<(), NewError> {
     info!("creating new VM {}", spec.name);
 
     info!("creating cloud-init config");
@@ -37,7 +49,7 @@ pub fn new(spec: &Specification) -> anyhow::Result<()> {
     Ok(())
 }
 
-fn wait_for_port(name: &str, port: i32) -> anyhow::Result<()> {
+fn wait_for_port(name: &str, port: i32) -> Result<(), NewError> {
     let addr = format!("{}:{}", name, port);
     loop {
         if TcpStream::connect(&addr).is_ok() {