From f97da4b11c8d38f3bb002407076bf56acba8675b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Sat, 25 May 2024 23:06:56 +0200
Subject: [PATCH] libutil/source-accessor: custom error if source does not
 exist

This allows better error handling by catching this error in particular.
---
 src/libutil/source-accessor.cc | 2 +-
 src/libutil/source-accessor.hh | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libutil/source-accessor.cc b/src/libutil/source-accessor.cc
index 66093d2cc..e797951c7 100644
--- a/src/libutil/source-accessor.cc
+++ b/src/libutil/source-accessor.cc
@@ -53,7 +53,7 @@ SourceAccessor::Stat SourceAccessor::lstat(const CanonPath & path)
     if (auto st = maybeLstat(path))
         return *st;
     else
-        throw Error("path '%s' does not exist", showPath(path));
+        throw FileNotFound("path '%s' does not exist", showPath(path));
 }
 
 void SourceAccessor::setPathDisplay(std::string displayPrefix, std::string displaySuffix)
diff --git a/src/libutil/source-accessor.hh b/src/libutil/source-accessor.hh
index d7fb0af5f..cc8db01f5 100644
--- a/src/libutil/source-accessor.hh
+++ b/src/libutil/source-accessor.hh
@@ -29,6 +29,8 @@ enum class SymlinkResolution {
     Full,
 };
 
+MakeError(FileNotFound, Error);
+
 /**
  * A read-only filesystem abstraction. This is used by the Nix
  * evaluator and elsewhere for accessing sources in various