prereq check (#8151)

1 files changed, 49 insertions, 0 deletions

diff --git a/scripts/prereq-check.sh b/scripts/prereq-check.sh
new file mode 100755
index 000000000..1c9ae8405
--- /dev/null
+++ b/scripts/prereq-check.sh
@@ -0,0 +1,49 @@
+#!/bin/bash
+check_version()
+{
+    local version=$1 check=$2
+    local winner=$(echo -e "$version\n$check" | sed '/^$/d' | sort -nr | head -1)
+    [[ "$winner" = "$version" ]] && return 0
+    return 1
+}
+
+check_prereq()
+{
+    if [ ! $# == 3 ]; then
+        echo "Unable to determine '$1' version! Ensure that '$1' is in your path and try again." && exit 1
+    fi
+
+    local dependency=$1 required_version=$2 installed_version=$3
+
+    type $dependency >/dev/null 2>&1 || { echo >&2 "Mattermost requires '$dependency' but it doesn't appear to be installed.  Aborting."; exit 1; }
+
+    if check_version $installed_version $required_version; then
+        echo "$dependency minimum requirement met. Required: $required_version, Found: $installed_version"
+    else 
+        echo "WARNING! Mattermost did not find the minimum supported version of '$dependency' installed. Required: $required_version, Found: $installed_version"
+        echo "We highly recommend stopping installation and updating dependencies before continuing"
+        read -p "Enter Y to continue anyway (not recommended)." -n 1 -r
+        echo
+        if [[ ! $REPLY =~ ^[Yy]$ ]]
+        then
+            exit 1
+        fi
+    fi
+}
+
+echo "Checking prerequisites"
+
+REQUIREDNODEVERSION=8.9.0
+REQUIREDNPMVERSION=5.6.0
+REQUIREDGOVERSION=1.9.2
+REQUIREDDOCKERVERSION=17.0
+
+NODEVERSION=$(sed 's/v//' <<< $(node -v))
+NPMVERSION=$(npm -v)
+GOVERSION=$(sed -ne 's/[^0-9]*\(\([0-9]\.\)\{0,4\}[0-9][^.]\).*/\1/p' <<< $(go version))
+DOCKERVERSION=$(docker version --format '{{.Server.Version}}' | sed 's/[a-z-]//g')
+
+check_prereq 'node' $REQUIREDNODEVERSION $NODEVERSION
+check_prereq 'npm' $REQUIREDNPMVERSION $NPMVERSION
+check_prereq 'go' $REQUIREDGOVERSION $GOVERSION
+check_prereq 'docker' $REQUIREDDOCKERVERSION $DOCKERVERSION
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