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[bug#36676] [PATCH 1/3] guix: cargo-build-system: Set CARGO_HOME early t

From: Robert Vollmert
Subject: [bug#36676] [PATCH 1/3] guix: cargo-build-system: Set CARGO_HOME early to fix build
Date: Mon, 15 Jul 2019 21:41:53 +0200

This makes the packages from (gnu packages crates-io)
not fail to build outright with

starting phase `build'
error: failed to acquire package cache lock

Caused by:
  failed to open: /homeless-shelter/.cargo/.package-cache

Caused by:
  Permission denied (os error 13)
phase `build' failed after 0.0 seconds

* guix/build/cargo-build-system.scm (configure): Set CARGO_HOME.
(install): No longer set CARGO_HOME.
 guix/build/cargo-build-system.scm | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/guix/build/cargo-build-system.scm 
index 1f36304b15..e4e62dd838 100644
--- a/guix/build/cargo-build-system.scm
+++ b/guix/build/cargo-build-system.scm
@@ -99,6 +99,7 @@ Cargo.toml file present at its root."
   ;; Configure cargo to actually use this new directory.
+  (setenv "CARGO_HOME" (string-append (getcwd) "/.cargo"))
   (mkdir-p ".cargo")
   (let ((port (open-file ".cargo/config" "w" #:encoding "utf-8")))
     (display "
@@ -148,9 +149,6 @@ directory = '" port)
     ;; Make cargo reuse all the artifacts we just built instead
     ;; of defaulting to making a new temp directory
     (setenv "CARGO_TARGET_DIR" "./target")
-    ;; Force cargo to honor our .cargo/config definitions
-    ;;
-    (setenv "CARGO_HOME" ".")
     ;; Only install crates which include binary targets,
     ;; otherwise cargo will raise an error.
2.20.1 (Apple Git-117)

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