Disable http2 in cargo

Since 1.31.0 cargo requires curl to support http2. Enabling http2 in
curl results in a dependency loop. This commit disables the use of
multiplexing and http2.

classes/cargo_common.bbclass

@@ -51,18 +51,15 @@ cargo_common_do_configure () {
 		EOF
 	fi
 
-	if [ -n "${http_proxy}" ]; then
+        # Disable multiplexing in order to keep cargo from using http2, which we
+        # can't currently enable because of dependency loops
         cat <<- EOF >> ${CARGO_HOME}/config
 		[http]
-		proxy = "${http_proxy}"
+		multiplexing = false
 	EOF
-	fi
 
-	if [ -n "${https_proxy}" ]; then
+	if [ -n "${http_proxy}" ]; then
-		cat <<- EOF >> ${CARGO_HOME}/config
+		echo "proxy = \"{http_proxy}\"" >> ${CARGO_HOME}/config
-		[https]
-		proxy = "${https_proxy}"
-		EOF
 	fi
 
 	echo "[target.${HOST_SYS}]" >> ${CARGO_HOME}/config

recipes-devtools/cargo/cargo.inc

@@ -11,6 +11,8 @@ LIC_FILES_CHKSUM = " \
     file://LICENSE-THIRD-PARTY;md5=892ea68b169e69cfe75097fc38a15b56 \
 "
 
+SRC_URI += "file://0001-Disable-http2.patch"
+
 S = "${RUSTSRC}/src/tools/cargo"
 CARGO_VENDORING_DIRECTORY = "${RUSTSRC}/vendor"
 

recipes-devtools/cargo/cargo/0001-Disable-http2.patch

@@ -0,0 +1,30 @@
+From a66e33d612d2207154de20e24701b0c30056fe7a Mon Sep 17 00:00:00 2001
+From: Johan Anderholm <johan.anderholm@gmail.com>
+Date: Sun, 27 Jan 2019 10:19:00 +0100
+Subject: [PATCH] Disable http2
+
+http2 requires that curl is build with nghttp2 which in turn depends on
+many dependencies and ultimately a dependency loop in the case of
+curl-native. As long as multiplexing is disabled in cargo this should
+be fine.
+
+Upstream-Status: Inappropriate
+---
+ Cargo.toml | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Cargo.toml b/Cargo.toml
+index d2d48ff7..d5dff47d 100644
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -22,7 +22,7 @@ bytesize = "1.0"
+ crates-io = { path = "src/crates-io", version = "0.21" }
+ crossbeam-utils = "0.6"
+ crypto-hash = "0.3.1"
+-curl = { version = "0.4.19", features = ['http2'] }
++curl = { version = "0.4.19" }
+ curl-sys = "0.4.15"
+ env_logger = "0.6.0"
+ pretty_env_logger = { version = "0.2", optional = true }
+-- 
+2.17.1

recipes-devtools/rust/libstd-rs.inc

@@ -26,6 +26,6 @@ do_install () {
     # With the incremental build support added in 1.24, the libstd deps directory also includes dependency
     # files that get installed. Those are really only needed to incrementally rebuild the libstd library
     # itself and don't need to be installed.
-    rm ${B}/${TARGET_SYS}/${BUILD_DIR}/deps/*.d
+    rm -f ${B}/${TARGET_SYS}/${BUILD_DIR}/deps/*.d
     cp ${B}/${TARGET_SYS}/${BUILD_DIR}/deps/* ${D}${rustlibdir}
 }