From 4e8c307fd562d37e8233a18c226786f6bd51646e Mon Sep 17 00:00:00 2001
From: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Date: Wed, 10 Dec 2025 18:40:32 +0100
Subject: [PATCH] deb: first implementation

---
 src/changelog.rs |  2 +-
 src/deb.rs       | 29 +++++++++++++++++++++++++++++
 src/lib.rs       |  2 ++
 src/main.rs      | 11 +++++++++--
 4 files changed, 41 insertions(+), 3 deletions(-)
 create mode 100644 src/deb.rs

diff --git a/src/changelog.rs b/src/changelog.rs
index 442f58b..5ee419a 100644
--- a/src/changelog.rs
+++ b/src/changelog.rs
@@ -123,7 +123,7 @@ fn increment_suffix(version: &str, suffix: &str) -> String {
 /*
 * Parse a changelog file first entry header, to obtain (package, version, series)
 */
-fn parse_changelog_header(
+pub fn parse_changelog_header(
     path: &Path,
 ) -> Result<(String, String, String), Box<dyn std::error::Error>> {
     let file = File::open(path)?;
diff --git a/src/deb.rs b/src/deb.rs
new file mode 100644
index 0000000..1ac38da
--- /dev/null
+++ b/src/deb.rs
@@ -0,0 +1,29 @@
+use std::error::Error;
+use std::path::Path;
+use std::process::Command;
+
+pub fn build_binary_package(cwd: Option<&Path>) -> Result<(), Box<dyn Error>> {
+    let cwd = cwd.unwrap_or_else(|| Path::new("."));
+
+    // Parse changelog to get package name and version
+    let changelog_path = cwd.join("debian/changelog");
+    let (package, version, _series) = crate::changelog::parse_changelog_header(&changelog_path)?;
+
+    // Construct dsc file name
+    let parent = cwd.parent().ok_or("Cannot find parent directory")?;
+    let dsc_name = format!("{}_{}.dsc", package, version);
+    let dsc_path = parent.join(&dsc_name);
+    if !dsc_path.exists() {
+        return Err(format!("Could not find .dsc file at {}", dsc_path.display()).into());
+    }
+
+    println!("Building {} using sbuild...", dsc_path.display());
+
+    let status = Command::new("sbuild").arg(dsc_path).status()?;
+
+    if !status.success() {
+        return Err(format!("sbuild failed with status: {}", status).into());
+    }
+
+    Ok(())
+}
diff --git a/src/lib.rs b/src/lib.rs
index ca7b7a0..e9f0664 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,6 @@
 pub mod build;
+pub mod changelog;
+pub mod deb;
 pub mod package_info;
 pub mod pull;
 
diff --git a/src/main.rs b/src/main.rs
index 6470122..84b1bb0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,8 +8,7 @@ extern crate flate2;
 
 use pkh::pull::pull;
 
-mod changelog;
-use changelog::generate_entry;
+use pkh::changelog::generate_entry;
 
 use indicatif_log_bridge::LogWrapper;
 use log::{error, info};
@@ -50,6 +49,7 @@ fn main() {
                 .arg(arg!(-v --version <version> "Target version").required(false)),
         )
         .subcommand(Command::new("build").about("Build the source package"))
+        .subcommand(Command::new("deb").about("Build the binary package"))
         .get_matches();
 
     match matches.subcommand() {
@@ -109,6 +109,13 @@ fn main() {
                 std::process::exit(1);
             }
         }
+        Some(("deb", _sub_matches)) => {
+            let cwd = std::env::current_dir().unwrap();
+            if let Err(e) = pkh::deb::build_binary_package(Some(&cwd)) {
+                error!("{}", e);
+                std::process::exit(1);
+            }
+        }
         _ => unreachable!("Exhausted list of subcommands and subcommand_required prevents `None`"),
     }
 }