Merge pull request #92 from solidnerd/feature/Dockerfile

Add direct support for docker

Dockerfile

@@ -0,0 +1,11 @@
+# This file is a template, and might need editing before it works on your project.
+FROM golang:1.8-alpine AS builder
+# We'll likely need to add SSL root certificates
+RUN apk --no-cache add ca-certificates
+# Missing part for compiling the application by it self because it requires a sock
+FROM scratch
+# Since we started from scratch, we'll copy the SSL root certificates from the builder
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY lstags /usr/local/bin/lstags
+ENTRYPOINT [ "/usr/local/bin/lstags" ]
+CMD ["--help"]

Makefile

@@ -1,3 +1,5 @@
+.PHONY: docker
+
 all: prepare dep test lint vet build
 
 offline: unit-test lint vet build
@@ -78,8 +80,8 @@ fail-on-errors:
 	@test `echo "${ERRORS}" | grep . | wc -l` -eq 0
 
 build:
-	@if [[ -z "${GOOS}" ]]; then go build; fi
-	@if [[ -n "${GOOS}" ]]; then mkdir -p dist/assets/lstags-${GOOS}; GOOS=${GOOS} go build -o dist/assets/lstags-${GOOS}/lstags; fi
+	@if [[ -z "${GOOS}" ]]; then go build -ldflags '-d -s -w' -a -tags netgo -installsuffix netgo; fi
+	@if [[ -n "${GOOS}" ]]; then mkdir -p dist/assets/lstags-${GOOS}; GOOS=${GOOS} go build -ldflags '-d -s -w' -a -tags netgo -installsuffix netgo -o dist/assets/lstags-${GOOS}/lstags; fi
 
 xbuild:
 	${MAKE} --no-print-directory build GOOS=linux
@@ -118,3 +120,7 @@ deploy:
 	test -n "${GITHUB_TOKEN}" && git tag ${TAG} && git push --tags
 	GITHUB_TOKEN=${GITHUB_TOKEN} ./scripts/github-create-release.sh ./dist/release
 	GITHUB_TOKEN=${GITHUB_TOKEN} ./scripts/github-upload-assets.sh ${TAG} ./dist/assets
+
+docker:
+	@docker container run -v $(shell pwd):/go/src/github.com/ivanilves/lstags -w /go/src/github.com/ivanilves/lstags -v /var/run/docker.sock:/var/run/docker.sock golang:1.8 scripts/prepare-docker-build.sh
+	@docker image build -t ivanilves/lstags .

README.md

@@ -67,3 +67,58 @@ go build
 ./lstags -h
 ```
 **NB!** I assume you have current versions of Go & [dep](https://github.com/golang/dep) installed and also have set up [GOPATH](https://github.com/golang/go/wiki/GOPATH) correctly.
+
+## Using it with docker
+
+```sh
+docker run --rm -it -v /var/run/docker.sock:/var/run/docker.sock ivanilves/lstags
+Usage:
+  lstags [OPTIONS] REPO1 REPO2 REPOn...
+
+Application Options:
+  -j, --docker-json=          JSON file with credentials (default:
+                              ~/.docker/config.json) [$DOCKER_JSON]
+  -p, --pull                  Pull Docker images matched by filter (will use
+                              local Docker deamon) [$PULL]
+  -P, --push                  Push Docker images matched by filter to some
+                              registry (See 'push-registry') [$PUSH]
+  -r, --push-registry=        [Re]Push pulled images to a specified remote
+                              registry [$PUSH_REGISTRY]
+  -R, --push-prefix=          [Re]Push pulled images with a specified repo path
+                              prefix [$PUSH_PREFIX]
+  -U, --push-update           Update our pushed images if remote image digest
+                              changes [$PUSH_UPDATE]
+  -c, --concurrent-requests=  Limit of concurrent requests to the registry
+                              (default: 32) [$CONCURRENT_REQUESTS]
+  -I, --insecure-registry-ex= Expression to match insecure registry hostnames
+                              [$INSECURE_REGISTRY_EX]
+  -T, --trace-requests        Trace Docker registry HTTP requests
+                              [$TRACE_REQUESTS]
+  -N, --do-not-fail           Do not fail on non-critical errors (could be
+                              dangerous!) [$DO_NOT_FAIL]
+  -V, --version               Show version and exit
+
+Help Options:
+  -h, --help                  Show this help message
+
+Arguments:
+  REPO1 REPO2 REPOn:          Docker repositories to operate on, e.g.: alpine
+                              nginx~/1\.13\.5$/ busybox~/1.27.2/
+```
+
+### Analyze an image
+
+```sh
+docker run --rm -it  -v /var/run/docker.sock:/var/run/docker.sock ivanilves/lstags alpine~/^3\\./
+ANALYZE alpine
+FETCHED alpine
+-
+<STATE>      <DIGEST>                                      <(local) ID>    <Created At>              <TAG>
+CHANGED      sha256:b40e202395eaec699f2d0c5e01e6d6cb8      76da55c8019d    2017-10-25T23:19:51Z      alpine:3.6
+ABSENT       sha256:d95da16498d5d6fb4b907cbe013f95032      n/a             2017-10-25T23:20:18Z      alpine:3.1
+ABSENT       sha256:cb275b62f789b211114f28b391fca3cc2      n/a             2017-10-25T23:20:32Z      alpine:3.2
+ABSENT       sha256:27af7da847283a947c008592f2b2cd6d2      n/a             2017-10-25T23:20:45Z      alpine:3.3
+CHANGED      sha256:246bbbaa81b28837b64cb9dfc574de958      1a19a71e5d38    2017-10-25T23:20:59Z      alpine:3.4
+CHANGED      sha256:aa96c8dc3815c44d4aceaf1ee7903ce58      37c7be7a096b    2017-10-25T23:21:13Z      alpine:3.5
+-
+```

scripts/prepare-docker-build.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+# Workaround because the Makefile doesn't recognize the bash
+# This should be fixed in the Makefile and not in the directory    
+ln -nfs /bin/bash /bin/sh
+make all