From a444a5d8d247ee4d772ac81e79ea5bdfadff3b67 Mon Sep 17 00:00:00 2001
From: Valentin Haudiquet <valentin.haudiquet@canonical.com>
Date: Fri, 9 Jan 2026 23:15:13 +0100
Subject: [PATCH] deb: fix bug in find_dsc_file

---
 src/context/api.rs     |  6 ++++++
 src/context/local.rs   |  4 ++++
 src/context/schroot.rs | 10 ++++++++++
 src/context/ssh.rs     |  9 +++++++++
 src/context/unshare.rs |  5 +++++
 src/deb/mod.rs         |  4 +++-
 6 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/context/api.rs b/src/context/api.rs
index 0403886..7ee38b3 100644
--- a/src/context/api.rs
+++ b/src/context/api.rs
@@ -33,6 +33,7 @@ pub trait ContextDriver {
     fn copy_path(&self, src: &Path, dest: &Path) -> io::Result<()>;
     fn read_file(&self, path: &Path) -> io::Result<String>;
     fn write_file(&self, path: &Path, content: &str) -> io::Result<()>;
+    fn exists(&self, path: &Path) -> io::Result<bool>;
 }
 
 /// Represents an execution environment (Local or via SSH).
@@ -180,6 +181,11 @@ impl Context {
         self.driver().as_ref().unwrap().write_file(path, content)
     }
 
+    /// Check if a file or directory exists inside context
+    pub fn exists(&self, path: &Path) -> io::Result<bool> {
+        self.driver().as_ref().unwrap().exists(path)
+    }
+
     /// Create and obtain a specific driver for the context
     pub fn driver(
         &self,
diff --git a/src/context/local.rs b/src/context/local.rs
index ac118b4..7d391cc 100644
--- a/src/context/local.rs
+++ b/src/context/local.rs
@@ -78,6 +78,10 @@ impl ContextDriver for LocalDriver {
     fn write_file(&self, path: &Path, content: &str) -> io::Result<()> {
         std::fs::write(path, content)
     }
+
+    fn exists(&self, path: &Path) -> io::Result<bool> {
+        Ok(path.exists())
+    }
 }
 
 fn copy_dir_recursive(src: &Path, dest: &Path) -> io::Result<()> {
diff --git a/src/context/schroot.rs b/src/context/schroot.rs
index ddd284a..a490d2a 100644
--- a/src/context/schroot.rs
+++ b/src/context/schroot.rs
@@ -262,4 +262,14 @@ impl ContextDriver for SchrootDriver {
         }
         Ok(())
     }
+
+    fn exists(&self, path: &Path) -> io::Result<bool> {
+        let status = self.run(
+            "test",
+            &["-e".to_string(), path.to_string_lossy().to_string()],
+            &[],
+            None,
+        )?;
+        Ok(status.success())
+    }
 }
diff --git a/src/context/ssh.rs b/src/context/ssh.rs
index 69b4ab8..382f58f 100644
--- a/src/context/ssh.rs
+++ b/src/context/ssh.rs
@@ -244,6 +244,15 @@ impl ContextDriver for SshDriver {
         remote_file.write_all(content.as_bytes())?;
         Ok(())
     }
+
+    fn exists(&self, path: &Path) -> io::Result<bool> {
+        let sess = connect_ssh(&self.host, self.user.as_deref(), self.port)?;
+        let sftp = sess.sftp().map_err(io::Error::other)?;
+        match sftp.stat(path) {
+            Ok(_) => Ok(true),
+            Err(_) => Ok(false),
+        }
+    }
 }
 
 impl SshDriver {
diff --git a/src/context/unshare.rs b/src/context/unshare.rs
index 8f70667..c1d86de 100644
--- a/src/context/unshare.rs
+++ b/src/context/unshare.rs
@@ -150,6 +150,11 @@ impl ContextDriver for UnshareDriver {
         let host_path = Path::new(&self.path).join(path.to_string_lossy().trim_start_matches('/'));
         self.parent().write_file(&host_path, content)
     }
+
+    fn exists(&self, path: &Path) -> io::Result<bool> {
+        let host_path = Path::new(&self.path).join(path.to_string_lossy().trim_start_matches('/'));
+        self.parent().exists(&host_path)
+    }
 }
 
 impl UnshareDriver {
diff --git a/src/deb/mod.rs b/src/deb/mod.rs
index 3624098..261bd27 100644
--- a/src/deb/mod.rs
+++ b/src/deb/mod.rs
@@ -95,7 +95,9 @@ fn find_dsc_file(
     let dsc_name = format!("{}_{}.dsc", package, version_without_epoch);
     let dsc_path = PathBuf::from(build_root).join(&dsc_name);
 
-    if !dsc_path.exists() {
+    // Check if the .dsc file exists in current context
+    let ctx = context::current();
+    if !ctx.exists(&dsc_path)? {
         return Err(format!("Could not find .dsc file at {}", dsc_path.display()).into());
     }
     Ok(dsc_path)