ci: make get-binary-toolchain run per build

In a distributed, non-homogeneous CI setup, the binary-toolchain setup
script might not run on the machine that needs the toolchains.  Make
this per-build and it will always be there, at the expense of running on
builds that might not need it (though it still should be fast).

Also, there is an issue with the directory where the binary toolchain is
located being global, and racing against other systems using, setting up,
and tearing down.  Link this to a local directory to avoid any races.
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -19,12 +19,15 @@ stages:
     BB_LOGCONFIG: $CI_PROJECT_DIR/ci/logging.yml
     TOOLCHAIN_DIR: $CI_BUILDS_DIR/persist/toolchains
     IMAGE_DIR: $CI_PROJECT_DIR/work/build/tmp/deploy/images
+    TOOLCHAIN_LINK_DIR: $CI_PROJECT_DIR/work/build/toolchains
   before_script:
     - echo KAS_WORK_DIR = $KAS_WORK_DIR
     - echo SSTATE_DIR = $SSTATE_DIR
     - echo DL_DIR = $DL_DIR
     - rm -rf $KAS_WORK_DIR
-    - mkdir --verbose --parents $KAS_WORK_DIR $KAS_REPO_REF_DIR $SSTATE_DIR $DL_DIR $TOOLCHAIN_DIR
+    - mkdir --verbose --parents $KAS_WORK_DIR $KAS_REPO_REF_DIR $SSTATE_DIR $DL_DIR $TOOLCHAIN_DIR $TOOLCHAIN_LINK_DIR
+    # Must do this here, as it's the only way to make sure the toolchain is installed on the same builder
+    - ./ci/get-binary-toolchains $DL_DIR $TOOLCHAIN_DIR $TOOLCHAIN_LINK_DIR
 
 # Generalised fragment to do a Kas build
 .build:
@@ -44,13 +47,6 @@ update-repos:
   script:
   - flock --verbose --timeout 60 $KAS_REPO_REF_DIR ./ci/update-repos
 
-get-binary-toolchains:
-  extends: .setup
-  stage: prep
-  script:
-    - ./ci/get-binary-toolchains $DL_DIR $TOOLCHAIN_DIR
-
-
 #
 # Bootstrap stage, bootstrap and machine coverage
 #

ci/external-gccarm.yml

@@ -5,4 +5,4 @@ local_conf_header:
   cc: |
     PNBLACKLIST[gcc-cross-arm] = "Using external toolchain"
     TCMODE = "external-arm"
-    EXTERNAL_TOOLCHAIN = "${TOOLCHAIN_DIR}/${TARGET_ARCH}"
+    EXTERNAL_TOOLCHAIN = "${TOPDIR}/toolchains/${TARGET_ARCH}"

ci/get-binary-toolchains

@@ -6,9 +6,10 @@ VER="10.2-2020.11"
 
 DOWNLOAD_DIR=$1
 TOOLCHAIN_DIR=$2
+TOOLCHAIN_LINK_DIR=$3
 
-# These should be already created by .bitlab-ci.yml, but do here if run outside of that env
-mkdir -p $DOWNLOAD_DIR $TOOLCHAIN_DIR
+# These should be already created by .gitlab-ci.yml, but do here if run outside of that env
+mkdir -p $DOWNLOAD_DIR $TOOLCHAIN_DIR $TOOLCHAIN_LINK_DIR
 
 if [ $HOST_ARCH = "aarch64" ]; then
 	#AArch64 Linux hosted cross compilers
@@ -32,21 +33,14 @@ else
 fi
 
 for i in arm aarch64 aarch64_be; do
-	if [ ! -f $DOWNLOAD_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu*.tar.xz ]; then
-		continue
-	fi
-
-	if [ -d $TOOLCHAIN_DIR/$i ]; then
-		echo "$TOOLCHAIN_DIR/$i EXISTS!"
-		MANIFEST=$(ls $TOOLCHAIN_DIR/$i | grep txt)
-		if [[ $MANIFEST != $VER-$HOST_ARCH-$i-none-linux-gnu*.txt ]]; then
-			echo "Removing old $MANIFEST for $VER-$HOST_ARCH-$i-*.txt toolchain"
-			rm -rf $TOOLCHAIN_DIR/$i
+	if [ ! -d $TOOLCHAIN_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu*/ ]; then
+		if [ ! -f $DOWNLOAD_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu*.tar.xz ]; then
+			continue
 		fi
-	fi
 
-	if [ ! -d $TOOLCHAIN_DIR/$i ]; then
 		tar -C $TOOLCHAIN_DIR -axvf $DOWNLOAD_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu*.tar.xz
-		mv $TOOLCHAIN_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu*/ $TOOLCHAIN_DIR/$i
 	fi
+
+	# Setup a link for the toolchain to use local to the building machine (e.g., not in a shared location)
+	ln -s $TOOLCHAIN_DIR/gcc-arm-$VER-$HOST_ARCH-$i-none-linux-gnu* $TOOLCHAIN_LINK_DIR/$i
 done