From 0282499e183c3a7aa4aa263b242f4ddcb401220f Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 7 Mar 2024 13:28:52 +0100
Subject: [PATCH] PathInputScheme::getFingerprint(): Don't barf on relative
 paths

This wasn't caught by CI because #10149 and #10152 pass
individually... It doesn't happen on lazy-trees either because we
never try to fetch relative path flakes (#10089).
---
 src/libfetchers/path.cc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/libfetchers/path.cc b/src/libfetchers/path.cc
index f1910a5dc..0af1bad73 100644
--- a/src/libfetchers/path.cc
+++ b/src/libfetchers/path.cc
@@ -89,6 +89,15 @@ struct PathInputScheme : InputScheme
         writeFile((CanonPath(getAbsPath(input)) / path).abs(), contents);
     }
 
+    std::optional<std::string> isRelative(const Input & input) const
+    {
+        auto path = getStrAttr(input.attrs, "path");
+        if (hasPrefix(path, "/"))
+            return std::nullopt;
+        else
+            return path;
+    }
+
     bool isLocked(const Input & input) const override
     {
         return (bool) input.getNarHash();
@@ -151,6 +160,9 @@ struct PathInputScheme : InputScheme
 
     std::optional<std::string> getFingerprint(ref<Store> store, const Input & input) const override
     {
+        if (isRelative(input))
+            return std::nullopt;
+
         /* If this path is in the Nix store, use the hash of the
            store object and the subpath. */
         auto path = getAbsPath(input);