[CI:DOCS] Improvements to make validatepr

Small usability improvements for our containerized validate target.

- Responds to SIGINT
- Exits if build fails, only validate if builds succeed
- Warns about potential of insufficient memory
- Document `make validatepr`

Signed-off-by: Ashley Cui <acui@redhat.com>

CONTRIBUTING.md

@@ -291,13 +291,7 @@ commit automatically with `git commit -s`.
 
 ### Go Format and lint
 
-All code changes must pass ``make validate`` and ``make lint``.
-
-```
-podman build -t gate -f contrib/gate/Dockerfile .
-```
-
-***N/B:*** **don't miss the dot (.) at the end, it's really important**
+All code changes must pass ``make validatepr``.
 
 ### Integration Tests
 

Makefile

@@ -324,6 +324,7 @@ validatepr:
 	$(PODMANCMD) run --rm \
 		-v $(CURDIR):/go/src/github.com/containers/podman \
 		--security-opt label=disable \
+		-it \
 		-w /go/src/github.com/containers/podman \
 		quay.io/libpod/validatepr:latest  \
 		make .validatepr

contrib/validatepr/validatepr.sh

@@ -6,18 +6,46 @@ set -x
 # This script is intended to help developers contribute to the podman project. It
 # checks various pre-CI checks like building, linting, man-pages, etc.  It is meant
 # to be run in a specific container environment.
-#
 
-# build all require incantations of podman
-echo "Building windows ..."
-GOOS=windows CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/test.windows ./cmd/podman
-echo "Building darwin..."
-GOOS=darwin CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/test.darwin ./cmd/podman
+build() {
+    err=""
 
-# build podman
-echo "Building podman binaries ..."
-make binaries
+    echo "Building windows"
+    if ! GOOS=windows CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/podman-remote-windows ./cmd/podman; then
+        err+="\n - Windows "
+    fi
 
+    echo "Building darwin"
+    if ! GOOS=darwin CGO_ENABLED=0 go build -tags "$REMOTETAGS" -o bin/podman-remote-darwin ./cmd/podman; then
+        err+="\n - Darwin "
+    fi
+
+    echo "Building podman binaries"
+    if ! make binaries; then
+        err+="\n - Additional Binaries "
+    fi
+
+    if [ ! -z "$err" ]
+    then
+        echo -e "\033[31mFailed to build: ${err}\033[0m">&2
+        exit 1
+    fi
+}
+
+validate(){
+    echo "Running validation tooling"
+
+    # golangci-lint gobbles memory.
+    # By default, podman machines only have 2GB memory,
+    # often causing the linter be killed when run on Darwin/Windows
+    mem=$(awk '/MemTotal/ {print $2}' /proc/meminfo)
+    if (( $((mem)) < 3900000 )); then
+        echo -e "\033[33mWarning: Your machine may not have sufficient memory (< 4 GB)to run the linter. \
+If the process is killed, please allocate more memory.\033[0m">&2
+    fi
 
-echo "Running validation tooling ..."
     make validate
+}
+
+build
+validate