e2e_node: use mktemp when building nsenter on trusty

There's a bit of a hack in place to insure nsenter is present on Ubuntu trusty, which doesn't otherwise include it. This downloads util-linux to a hard coded directory in /tmp which is a bad practice. Even though "this is just a test case" it should properly use mktemp. Signed-off-by: Tim Pepper <tpepper@vmware.com>

e2e_node: use mktemp when building nsenter on trusty
5256e26f · Tim Pepper · 4956e65d · 5256e26f
Commit 5256e26f authored Nov 20, 2017 by Tim Pepper
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setup_host.sh test/e2e_node/environment/setup_host.sh +3 -3

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--- a/test/e2e_node/environment/setup_host.sh
+++ b/test/e2e_node/environment/setup_host.sh
@@ -57,8 +57,8 @@ cat /etc/*-release | grep "ID=ubuntu"
 if [ $? -eq 0 ]; then
  if ! which nsenter > /dev/null; then
     echo "Do not find nsenter. Install it."
-     mkdir -p /tmp/nsenter-install
-     cd /tmp/nsenter-install
+     NSENTER_BUILD_DIR=$(mktemp -d /tmp/nsenter-build-XXXXXX)
+     cd $NSENTER_BUILD_DIR
     curl https://www.kernel.org/pub/linux/utils/util-linux/v2.24/util-linux-2.24.tar.gz | tar -zxf-
     sudo apt-get update
     sudo apt-get --yes install make
@@ -67,7 +67,7 @@ if [ $? -eq 0 ]; then
     ./configure --without-ncurses
     make nsenter
     sudo cp nsenter /usr/local/bin
-     rm -rf /tmp/nsenter-install
+     rm -rf $NSENTER_BUILD_DIR
   fi
 fi