From 3e18607be38fe5294fc4773220f25452ce0b7f9f Mon Sep 17 00:00:00 2001
From: figsoda <figsoda@pm.me>
Date: Sun, 26 Feb 2023 11:51:55 -0500
Subject: [PATCH] rustPlatform.cargoSetupHook: dereference symlinks in
 cargoDeps

unpackFile doesn't dereference symlinks if cargoDeps is a directory, and
some cargo builds run into permission issues because the files the
symlinks point to are not writable.
---
 pkgs/build-support/rust/hooks/cargo-setup-hook.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/rust/hooks/cargo-setup-hook.sh b/pkgs/build-support/rust/hooks/cargo-setup-hook.sh
index 90a81d68b520..42c05e42b0b8 100644
--- a/pkgs/build-support/rust/hooks/cargo-setup-hook.sh
+++ b/pkgs/build-support/rust/hooks/cargo-setup-hook.sh
@@ -8,7 +8,13 @@ cargoSetupPostUnpackHook() {
     # it writable. If we're using a tarball, the unpackFile hook already handles
     # this for us automatically.
     if [ -z $cargoVendorDir ]; then
-        unpackFile "$cargoDeps"
+        if [ -d "$cargoDeps" ]; then
+            local dest=$(stripHash "$cargoDeps")
+            cp -Lr --reflink=auto -- "$cargoDeps" "$dest"
+            chmod -R +644 -- "$dest"
+        else
+            unpackFile "$cargoDeps"
+        fi
         export cargoDepsCopy="$(realpath "$(stripHash $cargoDeps)")"
     else
         cargoDepsCopy="$(realpath "$(pwd)/$sourceRoot/${cargoRoot:+$cargoRoot/}${cargoVendorDir}")"