Validate packer version before install

Packer 1.1.3 is the minimum version required to be installed
to build images on vexxhost. The install script does not check
the version and only checks the availability of the binary in the
$PATH before updating packer.

JIRA: RELENG-838
Change-Id: I8c343176d8f39e3e70b04dddbdec94ffed4354b1
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/shell/packer-install.sh b/shell/packer-install.sh
index 8b3ef6d..90780cb 100644 (file)
--- a/shell/packer-install.sh
+++ b/shell/packer-install.sh
@@ -12,18 +12,14 @@ echo "---> packer-install.sh"
 # The script checks for the packer binaries and installs the binary
 # if its not available
 
-# $PACKER_VERSION        : Define a packer version passed as job paramter
+# Ensure we fail the job if any steps fail.
+set -eu -o pipefail
 
+# $PACKER_VERSION        : Define a packer version passed as job paramter
 PACKER_VERSION="${PACKER_VERSION:-1.1.3}"
 export PATH="${WORKSPACE}/bin:$PATH"
 
-# Ensure we fail the job if any steps fail.
-set -eu -o pipefail
-
-if hash packer.io 2>/dev/null; then
-    echo "packer.io command is available."
-else
-    echo "packer.io command not is available. Installing packer ..."
+packer_install() {
     # Installs Hashicorp's Packer binary, required for verify & merge packer jobs
     pushd "${WORKSPACE}"
     wget -nv "https://releases.hashicorp.com/packer/${PACKER_VERSION}/packer_${PACKER_VERSION}_linux_amd64.zip"
@@ -32,4 +28,23 @@ else
     # rename packer to avoid conflict with binary in cracklib
     mv "${WORKSPACE}/bin/packer" "${WORKSPACE}/bin/packer.io"
     popd
+}
+
+# Functions to compare semantic versions x.y.z
+version_gt() { test "$(echo "$@" | tr " " "\n" | sort -V | head -n 1)" != "$1"; }
+version_le() { test "$(echo "$@" | tr " " "\n" | sort -V | head -n 1)" == "$1"; }
+version_lt() { test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" != "$1"; }
+version_ge() { test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" == "$1"; }
+
+if hash packer.io 2>/dev/null; then
+    CURRENT_VERSION="$(packer.io --version)"
+    if version_lt $CURRENT_VERSION $PACKER_VERSION; then
+       echo "Packer version $CURRENT_VERSION installed is less than $PACKER_VERSION available, updating Packer."
+       packer_install
+    else
+      echo "Packer version installed $CURRENT_VERSION is greater than or equal to the required minimum version $PACKER_VERSION."
+    fi
+else
+    echo "Packer binary not available, installing Packer version $PACKER_VERSION."
+    packer_install
 fi