ipc: Improve error message.

  - If we can't open the socket, include the socket's file name as
    context.

1 files changed, 3 insertions, 1 deletions

diff --git a/ipc/src/assuan/socket/windows.rs b/ipc/src/assuan/socket/windows.rs
index 02841e09..0ae207de 100644
--- a/ipc/src/assuan/socket/windows.rs
+++ b/ipc/src/assuan/socket/windows.rs
@@ -48,7 +48,9 @@ pub enum UdsEmulation {
 ///
 /// Inspired by `read_port_and nonce` from assuan-socket.c.
 pub fn read_port_and_nonce(fname: &Path) -> Result<Rendezvous> {
-    let mut file = File::open(fname)?;
+    let mut file = File::open(fname).with_context(|| {
+        format!("Opening gpg-agent socket {}", fname.display())
+    })?;
     // Socket connection info will be in either a <= 54 byte long Cygwin format
     // or ~5+1+16 (modulo whitespace separators) custom libassuan format
     let mut contents = Vec::with_capacity(64);