Allow to specify ramdisk size for a build with RAMDISK_SIZE build config var.

This was a bit tricky, as ramdisk mounting happens with root privs, and we don't
want to evaluate potentially arbitrary code in a build config with root privs.
So, set up as simple sudo sandox to query that var.

1 files changed, 34 insertions, 13 deletions

diff --git a/node/build b/node/build
index fd32261..95c1025 100755
--- a/node/build
+++ b/node/build
@@ -7,9 +7,25 @@
 # which accompanies this distribution, and is available at
 # http://www.eclipse.org/legal/epl-v10.html
 ###############################################################################
+#
+# $1 = mirror service host
+# $2 = build CONFIG, base64-encoded
+#
 
 set -xe
 
+# We need ramdisk size when executing under root, but still don't want
+# to evaluate build config (== arbitrary code) as such.
+function get_ramdisk_size () {
+    sudo -E -H -u jenkins-build bash -es "$1" <<\EOF
+    export CONFIGURATION="$(echo "$1" | base64 -id)"
+    set -a
+    eval "$CONFIGURATION"
+    set +a
+    echo $RAMDISK_SIZE
+EOF
+}
+
 BUILD_SCRIPT_ROOT=$(readlink -f "$(dirname "${0}")/../build-scripts")
 
 # Stopgap measure to cleanup environment on instances reused for different jobs
@@ -20,19 +36,24 @@ umount build || true
 rm -rf build
 mkdir build
 
-# XXX mounting build/out on a tmpfs is probably a bit android specific...
-mem_total=`cat /proc/meminfo | grep MemTotal | sed -s 's/[^0-9]*\([0-9]*\) kB/\1/'`
-if [ "$mem_total" -gt 15680064 ]
-then
-  echo using 11.75G tmpfs for build
-  mount -t tmpfs -o size=11750M tmpfs build
-elif [ "$mem_total" -gt 10485760 ]
-then
-  echo using 11.75G tmpfs for build/out
-  mkdir build/out
-  mount -t tmpfs -o size=11750M tmpfs build/out
-else
-  mkdir build/out
+ramdisk_size=$(get_ramdisk_size $2)
+
+# Put build/* on a ramdisk to speed up build
+if [ -z "$ramdisk_size" -o "$ramdisk_size" -gt 0 ]; then
+    mem_total=`cat /proc/meminfo | grep MemTotal | sed -s 's/[^0-9]*\([0-9]*\) kB/\1/'`
+    if [ "$mem_total" -gt 15680064 ]; then
+      ramisk_size=${ramdisk_size:-11750M}
+      echo "Using $ramdisk_size tmpfs for build"
+      mount -t tmpfs -o size=$ramdisk_size tmpfs build
+    elif [ "$mem_total" -gt 10485760 ]; then
+      # XXX mounting build/out on a tmpfs is probably a bit android specific...
+      ramisk_size=${ramdisk_size:-11750M}
+      echo "Using $ramdisk_size tmpfs for build/out"
+      mkdir build/out
+      mount -t tmpfs -o size=$ramdisk_size tmpfs build/out
+    else
+      mkdir build/out
+    fi
 fi
 
 chown jenkins-build:nogroup build