Ensure install scripts only install if needed (elastic#20349)

* Ensure install scripts only install once

* Add unmet dep str

.ci/scripts/install-docker-compose.sh

@@ -2,9 +2,23 @@
 
 set -exuo pipefail
 
-MSG="parameter missing."
+MSG="environment variable missing: DOCKER_COMPOSE_VERSION."
 DOCKER_COMPOSE_VERSION=${DOCKER_COMPOSE_VERSION:?$MSG}
 HOME=${HOME:?$MSG}
+
+if command -v docker-compose
+then
+    echo "Found docker-compose. Checking version.."
+    FOUND_DOCKER_COMPOSE_VERSION=$(docker-compose --version|awk '{print $3}'|sed s/\,//)
+    if [ $FOUND_DOCKER_COMPOSE_VERSION == $DOCKER_COMPOSE_VERSION ]
+    then
+        echo "Versions match. No need to install docker-compose. Exiting."
+        exit 0
+    fi
+fi
+
+echo "UNMET DEP: Installing docker-compose"
+
 DC_CMD="${HOME}/bin/docker-compose"
 
 mkdir -p "${HOME}/bin"

.ci/scripts/install-go.sh

@@ -1,13 +1,25 @@
 #!/usr/bin/env bash
 set -exuo pipefail
 
-MSG="parameter missing."
+MSG="environment variable missing"
 GO_VERSION=${GO_VERSION:?$MSG}
 PROPERTIES_FILE=${PROPERTIES_FILE:-"go_env.properties"}
 HOME=${HOME:?$MSG}
 ARCH=$(uname -s| tr '[:upper:]' '[:lower:]')
 GVM_CMD="${HOME}/bin/gvm"
 
+if command -v go
+then
+    echo "Found Go. Checking version.."
+    FOUND_GO_VERSION=$(go version|awk '{print $3}'|sed s/go//)
+    if [ $FOUND_GO_VERSION == $GO_VERSION ]
+    then
+        echo "Versions match. No need to install Go. Exiting."
+        exit 0
+    fi
+fi
+
+echo "UNMET DEP: Installing Go"
 mkdir -p "${HOME}/bin"
 
 curl -sSLo "${GVM_CMD}" "https://github.com/andrewkroh/gvm/releases/download/v0.2.2/gvm-${ARCH}-amd64"

.ci/scripts/install-kind.sh

@@ -1,12 +1,25 @@
 #!/usr/bin/env bash
 set -exuo pipefail
 
-MSG="parameter missing."
+MSG="environment variable missing."
 DEFAULT_HOME="/usr/local"
 KIND_VERSION=${KIND_VERSION:?$MSG}
 HOME=${HOME:?$DEFAULT_HOME}
 KIND_CMD="${HOME}/bin/kind"
 
+if command -v kind
+then
+    echo "Found Kind. Checking version.."
+    FOUND_KIND_VERSION=$(kind --version 2>&1 >/dev/null | awk '{print $3}')
+    if [ $FOUND_KIND_VERSION == $KIND_VERSION ]
+    then
+        echo "Versions match. No need to install Kind. Exiting."
+        exit 0
+    fi
+fi
+
+echo "UNMET DEP: Installing Kind"
+
 mkdir -p "${HOME}/bin"
 
 curl -sSLo "${KIND_CMD}" "https://github.com/kubernetes-sigs/kind/releases/download/${KIND_VERSION}/kind-linux-amd64"

.ci/scripts/install-terraform.sh

@@ -2,13 +2,26 @@
 
 set -exuo pipefail
 
-MSG="parameter missing."
+MSG="environment variable missing."
 TERRAFORM_VERSION=${TERRAFORM_VERSION:?$MSG}
 HOME=${HOME:?$MSG}
 TERRAFORM_CMD="${HOME}/bin/terraform"
 
 OS=$(uname -s | tr '[:upper:]' '[:lower:]')
 
+if command -v terraform
+then
+    echo "Found Terraform. Checking version.."
+    FOUND_TERRAFORM_VERSION=$(terraform --version | awk '{print $2}' | sed s/v//)
+    if [ $FOUND_TERRAFORM_VERSION == $TERRAFORM_VERSION ]
+    then
+        echo "Versions match. No need to install Terraform. Exiting."
+        exit 0
+    fi
+fi
+
+echo "UNMET DEP: Installing Terraform"
+
 mkdir -p "${HOME}/bin"
 
 curl -sSLo - "https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_${OS}_amd64.zip" > ${TERRAFORM_CMD}.zip