go: fix bug - Go doesn't update version if go is already installed (#303)

* go: fix bug - Go doesn't update version if go is already installed

* Update tests with bash -c

src/go/devcontainer-feature.json

 {
     "id": "go",
-    "version": "1.1.0",
+    "version": "1.1.1",
     "name": "Go",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/go",
     "description": "Installs Go and common Go utilities. Auto-detects latest version and installs needed dependencies.",

src/go/install.sh

@@ -142,7 +142,8 @@ if ! cat /etc/group | grep -e "^golang:" > /dev/null 2>&1; then
 fi
 usermod -a -G golang "${USERNAME}"
 mkdir -p "${TARGET_GOROOT}" "${TARGET_GOPATH}"
-if [ "${TARGET_GO_VERSION}" != "none" ] && ! type go > /dev/null 2>&1; then
+
+if [[ "${TARGET_GO_VERSION}" != "none" ]] && [[ "$(go version)" != *"${TARGET_GO_VERSION}"* ]]; then
     # Use a temporary locaiton for gpg keys to avoid polluting image
     export GNUPGHOME="/tmp/tmp-gnupg"
     mkdir -p ${GNUPGHOME}
@@ -186,7 +187,7 @@ if [ "${TARGET_GO_VERSION}" != "none" ] && ! type go > /dev/null 2>&1; then
     tar -xzf /tmp/go.tar.gz -C "${TARGET_GOROOT}" --strip-components=1
     rm -rf /tmp/go.tar.gz /tmp/go.tar.gz.asc /tmp/tmp-gnupg
 else
-    echo "Go already installed. Skipping."
+    echo "(!) Go is already installed with version ${TARGET_GO_VERSION}. Skipping."
 fi
 
 # Install Go tools that are isImportant && !replacedByGopls based on
@@ -218,8 +219,10 @@ if [ "${INSTALL_GO_TOOLS}" = "true" ]; then
     (echo "${GO_TOOLS}" | xargs -n 1 go ${go_install_command} -v )2>&1 | tee -a /usr/local/etc/vscode-dev-containers/go.log
 
     # Move Go tools into path and clean up
+    if [ -d /tmp/gotools/bin ]; then
         mv /tmp/gotools/bin/* ${TARGET_GOPATH}/bin/
         rm -rf /tmp/gotools
+    fi
 
     # Install golangci-lint from precompiled binares
     if [ "$GOLANGCILINT_VERSION" = "latest" ] || [ "$GOLANGCILINT_VERSION" = "" ]; then

test/go/install_go_tool_in_postCreate.sh

@@ -5,9 +5,9 @@ set -e
 # Optional: Import test library
 source dev-container-features-test-lib
 
-check "mkcert version" mkcert --version | grep "v1.4.2"
-check "mkcert is installed at correct path" which mkcert | grep "/go/bin/mkcert"
-check "golangci-lint version" golangci-lint --version | grep "golangci-lint has version 1.50.0"
+check "mkcert version" bash -c "mkcert --version | grep v1.4.2"
+check "mkcert is installed at correct path" bash -c "which mkcert | grep /go/bin/mkcert"
+check "golangci-lint version" bash -c "golangci-lint --version | grep 'golangci-lint has version 1.50.0'"
 
 # Report result
 reportResults

test/go/install_go_twice.sh

+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+check "go-version" bash -c "go version | grep 1.19"
+
+# Report result
+reportResults

test/go/scenarios.json

@@ -8,5 +8,13 @@
             }
         },
         "postCreateCommand": "go install filippo.io/mkcert@v1.4.2"
+    },
+    "install_go_twice": {
+        "image": "mcr.microsoft.com/devcontainers/go:1.18",
+        "features": {
+            "go": {
+                "version": "1.19"
+            }
+        }
     }
 }

test/go/test.sh

@@ -7,7 +7,7 @@ source dev-container-features-test-lib
 
 check "version" go version
 check "revive version" revive --version
-check "revive is installed at correct path" which revive | grep "/go/bin/revive"
+check "revive is installed at correct path" bash -c "which revive | grep /go/bin/revive"
 
 # Report result
 reportResults
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