deb: cross-compilation, ephemeral contexts, local builds

Multiple changes:
- New contexts (schroot, unshare)
- Cross-building quirks, with ephemeral contexts and repositories management
- Contexts with parents, global context manager, better lifetime handling
- Local building of binary packages
- Pull: pulling dsc files by default
- Many small bugfixes and changes

Co-authored-by: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Co-committed-by: Valentin Haudiquet <valentin.haudiquet@canonical.com>

src/main.rs

@@ -3,6 +3,7 @@ use std::io::Write;
 
 extern crate clap;
 use clap::{Command, arg, command};
+use pkh::context::ContextConfig;
 
 extern crate flate2;
 
@@ -53,7 +54,11 @@ fn main() {
             Command::new("deb")
                 .about("Build the binary package")
                 .arg(arg!(-s --series <series> "Target distribution series").required(false))
-                .arg(arg!(-a --arch <arch> "Target architecture").required(false)),
+                .arg(arg!(-a --arch <arch> "Target architecture").required(false))
+                .arg(arg!(--cross "Cross-compile for target architecture (instead of qemu-binfmt)")
+                    .long_help("Cross-compile for target architecture (instead of using qemu-binfmt)\nNote that most packages cannot be cross-compiled").required(false))
+                .arg(arg!(--mode <mode> "Change build mode [sbuild, local]").required(false)
+                    .long_help("Change build mode [sbuild, local]\nDefault will chose depending on other parameters, don't provide if unsure")),
         )
         .subcommand(
             Command::new("context")
@@ -71,7 +76,10 @@ fn main() {
                         .about("Remove a context")
                         .arg(arg!(<name> "Context name"))
                 )
-                .subcommand(Command::new("ls").about("List contexts"))
+                .subcommand(
+                    Command::new("ls")
+                        .about("List contexts")
+                )
                 .subcommand(Command::new("show").about("Show current context"))
                 .subcommand(
                     Command::new("use")
@@ -142,22 +150,23 @@ fn main() {
             let cwd = std::env::current_dir().unwrap();
             let series = sub_matches.get_one::<String>("series").map(|s| s.as_str());
             let arch = sub_matches.get_one::<String>("arch").map(|s| s.as_str());
+            let cross = sub_matches.get_one::<bool>("cross").unwrap_or(&false);
+            let mode: Option<&str> = sub_matches.get_one::<String>("mode").map(|s| s.as_str());
+            let mode: Option<pkh::deb::BuildMode> = match mode {
+                Some("sbuild") => Some(pkh::deb::BuildMode::Sbuild),
+                Some("local") => Some(pkh::deb::BuildMode::Local),
+                _ => None,
+            };
 
-            if let Err(e) = pkh::deb::build_binary_package(arch, series, Some(cwd.as_path())) {
+            if let Err(e) =
+                pkh::deb::build_binary_package(arch, series, Some(cwd.as_path()), *cross, mode)
+            {
                 error!("{}", e);
                 std::process::exit(1);
             }
         }
         Some(("context", sub_matches)) => {
-            use pkh::context::{Context, ContextManager};
-
-            let mut mgr = match ContextManager::new() {
-                Ok(mgr) => mgr,
-                Err(e) => {
-                    error!("Failed to initialize context manager: {}", e);
-                    std::process::exit(1);
-                }
-            };
+            let mgr = pkh::context::manager();
 
             match sub_matches.subcommand() {
                 Some(("create", args)) => {
@@ -168,7 +177,7 @@ fn main() {
                         .unwrap_or("local");
 
                     let context = match type_str {
-                        "local" => Context::Local,
+                        "local" => ContextConfig::Local,
                         "ssh" => {
                             let endpoint = args
                                 .get_one::<String>("endpoint")
@@ -191,7 +200,7 @@ fn main() {
                                 })
                             });
 
-                            Context::Ssh { host, user, port }
+                            ContextConfig::Ssh { host, user, port }
                         }
                         _ => {
                             error!("Unknown context type: {}", type_str);
@@ -217,20 +226,14 @@ fn main() {
                     let contexts = mgr.list_contexts();
                     let current = mgr.current_name();
                     for ctx in contexts {
-                        if Some(&ctx) == current.as_ref() {
+                        if ctx == current {
                             println!("* {}", ctx);
                         } else {
                             println!("  {}", ctx);
                         }
                     }
                 }
-                Some(("show", _)) => {
-                    if let Some(name) = mgr.current_name() {
-                        println!("{}", name);
-                    } else {
-                        println!("No context set (defaulting to local)");
-                    }
-                }
+                Some(("show", _)) => {}
                 Some(("use", args)) => {
                     let name = args.get_one::<String>("name").unwrap();
                     if let Err(e) = mgr.set_current(name) {