Add regexp filtering for dockertags

.github/dependabot.yml

@@ -0,0 +1,22 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    labels:
+      - dependencies
+    schedule:
+      interval: "weekly"
+      day: sunday
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    labels:
+      - dependencies
+      - actions
+    schedule:
+      day: sunday
+      interval: weekly

.github/labels.yml

@@ -0,0 +1,37 @@
+# https://github.com/marketplace/actions/github-labeler
+- name: bug
+  color: "fbca04"
+  description: "This issue/PR relates to a bug."
+- name: deprecated
+  color: "fef2c0"
+  description: "This issue/PR relates to a deprecated module."
+- name: docs
+  color: "4071a5"
+  description: "This issue/PR relates to or includes documentation."
+- name: enhancement
+  color: "ededed"
+  description: "This issue/PR relates to a feature request."
+- name: feature
+  color: "006b75"
+  description: "This issue/PR relates to a feature request."
+- name: major
+  color: "c6476b"
+  description: "Marks an important and likely breaking change."
+- name: packaging
+  color: "4071a5"
+  description: "Packaging category"
+- name: performance
+  color: "555555"
+  description: "Relates to product or testing performance."
+- name: skip-changelog
+  color: "eeeeee"
+  description: "Can be missed from the changelog."
+- name: stale
+  color: "eeeeee"
+  description: "Not updated in long time, will be closed soon."
+- name: wontfix
+  color: "eeeeee"
+  description: "This will not be worked on"
+- name: test
+  color: "0e8a16"
+  description: "This PR relates to tests, QA, CI."

.github/linters/.hadolint.yaml

@@ -0,0 +1,6 @@
+---
+##########################
+## Hadolint config file ##
+##########################
+ignored:
+  - DL3018

.github/linters/.jscpd.json

@@ -0,0 +1,10 @@
+{
+  "threshold": 15,
+  "reporters": [
+    "consoleFull"
+  ],
+  "ignore": [
+    "**/__snapshots__/**"
+  ],
+  "absolute": true
+}

.github/linters/.markdown-lint.yml

@@ -0,0 +1,27 @@
+---
+###########################
+###########################
+## Markdown Linter rules ##
+###########################
+###########################
+
+###############
+# Rules by id #
+###############
+MD004: false                  # Unordered list style
+MD014: false
+MD024: false
+MD007:
+  indent: 2                   # Unordered list indentation
+MD013:
+  line_length: 400            # Line length 80 is far to short
+MD026:
+  punctuation: ".,;:!。，；:"  # List of not allowed
+MD029: false                  # Ordered list item prefix
+MD033: false                  # Allow inline HTML
+MD036: false                  # Emphasis used instead of a heading
+
+#################
+# Rules by tags #
+#################
+blank_lines: false  # Error on blank lines

.github/release-drafter.yml

@@ -0,0 +1,26 @@
+# Format and labels used aim to match those used by Ansible project
+categories:
+  - title: 'Major Changes'
+    labels:
+      - 'major'  # c6476b
+  - title: 'Minor Changes'
+    labels:
+      - 'feature'  # 006b75
+      - 'enhancement'  # ededed
+      - 'performance'  # 555555
+  - title: 'Bugfixes'
+    labels:
+      - 'fix'
+      - 'bugfix'
+      - 'bug'  # fbca04
+      - 'docs'  # 4071a5
+      - 'packaging'  # 4071a5
+      - 'test'  # #0e8a16
+  - title: 'Deprecations'
+    labels:
+      - 'deprecated'  # fef2c0
+exclude-labels:
+  - 'skip-changelog'
+template: |
+  ## Changes
+  $CHANGES

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,67 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ master ]
+  schedule:
+    - cron: '25 23 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v2
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2

.github/workflows/go-release-build.yml

@@ -0,0 +1,43 @@
+name: Generate release-artifacts
+
+on:
+  push:
+    tags:
+      - "*"
+
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_CLI_EXPERIMENTAL: "enabled"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Docker Login
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GH_PAT }}
+
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: 1.18.2
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v4
+        with:
+          version: latest
+          args: release --rm-dist --debug
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_PAT }}

.github/workflows/release-drafter.yml

@@ -0,0 +1,18 @@
+name: Release Drafter
+
+on:
+  push:
+    # branches to consider in the event; optional, defaults to all
+    branches:
+      - master
+      - 'releases/**'
+      - 'stable/**'
+
+jobs:
+  update_release_draft:
+    runs-on: ubuntu-latest
+    steps:
+      # Drafts your next Release notes as Pull Requests are merged into "master"
+      - uses: release-drafter/release-drafter@v5
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/superlinter.yml

@@ -0,0 +1,27 @@
+name: Super-Linter
+
+# Run this workflow every time a new commit pushed to your repository
+on: push
+
+jobs:
+  # Set the job key. The key is displayed as the job name
+  # when a job name is not provided
+  super-lint:
+    # Name the Job
+    name: Lint code base
+    # Set the type of machine to run on
+    runs-on: ubuntu-latest
+
+    steps:
+      # Checks out a copy of your repository on the ubuntu-latest machine
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      # Runs the Super-Linter action
+      - name: Run Super-Linter
+        uses: github/super-linter@v4.10.1
+        env:
+          DEFAULT_BRANCH: master
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          FILTER_REGEX_EXCLUDE: vendor/.*|integration/.*|\.github/.*
+          VALIDATE_BASH: false

.gitignore

@@ -33,3 +33,6 @@ _testmain.go
 /dockertags
 /bin
 /dist
+/build
+
+dist/

.golangci.yml

@@ -0,0 +1,21 @@
+---
+run:
+  timeout: 5m
+  modules-download-mode: readonly
+
+linters:
+  disable:
+    - golint
+    - typecheck
+    - structcheck
+  enable:
+    - errcheck
+    - goimports
+    - gocritic
+    - govet
+    - staticcheck
+
+issues:
+  exclude-use-default: false
+  max-issues-per-linter: 0
+  max-same-issues: 0

.goreleaser.yaml

@@ -0,0 +1,85 @@
+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+
+# The lines below are called `modelines`. See `:help modeline`
+# Feel free to remove those if you don't want/need to use them.
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# vim: set ts=2 sw=2 tw=0 fo=cnqoj
+
+version: 1
+
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod tidy
+    # you may remove this if you don't need go generate
+    - go generate ./...
+
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - 386
+      - amd64
+      - arm64
+
+dockers:
+  - dockerfile: Dockerfile-release
+    #    use: buildx
+    goos: linux
+    goarch: amd64
+    image_templates:
+      - ghcr.io/haad/{{ .ProjectName }}:{{ .Tag }}-amd64
+    build_flag_templates:
+      - --platform=linux/amd64
+      - "--pull"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.title={{.ProjectName}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+  - dockerfile: Dockerfile-release
+    #    use: buildx
+    goos: linux
+    goarch: arm64
+    image_templates:
+      - ghcr.io/haad/{{ .ProjectName }}:{{ .Tag }}-arm64v8
+    build_flag_templates:
+      - --platform=linux/arm64/v8
+      - "--pull"
+      - "--label=org.opencontainers.image.created={{.Date}}"
+      - "--label=org.opencontainers.image.title={{.ProjectName}}"
+      - "--label=org.opencontainers.image.revision={{.FullCommit}}"
+      - "--label=org.opencontainers.image.version={{.Version}}"
+
+archives:
+  - format: tar.gz
+    # this name template makes the OS and Arch compatible with the results of `uname`.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+    # use zip for windows archives
+    format_overrides:
+      - goos: windows
+        format: zip
+checksum:
+  name_template: "checksums.txt"
+  algorithm: sha256
+
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^vendor:"

.pre-commit-config.yaml

@@ -0,0 +1,35 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.2.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+        exclude: build/
+      - id: destroyed-symlinks
+      - id: detect-private-key
+        exclude: .github/linters
+      - id: check-ast
+      - id: check-case-conflict
+      - id: debug-statements
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v1.2.0
+    hooks:
+      - id: detect-secrets
+        exclude: build/|.travis.yml|.github/linters
+  - repo: https://github.com/golangci/golangci-lint
+    rev: v1.49.0
+    hooks:
+      - id: golangci-lint
+  # - repo: https://github.com/tekwizely/pre-commit-golang
+  #   rev: v1.0.0-beta.5
+  #   hooks:
+  #       - id: go-mod-tidy
+  #       - id: go-test-mod
+  #       - id: go-revive
+  #       - id: go-sec-mod
+  #       - id: go-lint
+  #       # -   id: go-critic
+  #       # -   id: golangci-lint

.travis.yml

@@ -1,9 +1,9 @@
 language: go
 go:
-  - '1.14'
+  - "1.18"
 env:
   global:
-  - secure: YtIXb4e4cHUWP5awg1q/x7eBsRULWM4CBZUvYs7U/pMre52oaCkT0IRCZ/sWfUiU8x6ax9NytrcF5JudH9uhysNDqcJcPyBmifloY0DEC9V2tGnnm/VeOS8nKVYbgJcFqsu4x9gdTfUC6HZ/hkTwIQih57ig5STeFX21eLAWSyUkyxq2QpM56Yhtxuc6IZ/K0uOFbLn0A2cV46Cwlln6lwDmTt23MWb8ZMwggd+EUptoj6kvQCJxuoP09k7xLIg6FB/lgKHsGqnIhEvt/A87vSCttYbBRN3CT8qgbVYKsL37nML3QH2akMkHacHSB7tEZCl+sTuK7b6T3fr3OrhuHZFjk2Q2JvFKMuVvv7m1bOulurA++WCOrxKq9CLqKaL51k2XzEr0BrqO2bWWMpEEq4JuTcRM5uCi2IORzyCPhO4li527GFHyQs1bDrdPcSm9xmlw9/QIqaS0g+3v7ve2qEVQpNLHlVkidb9D2nFztVFOnUfHUKwYvK/CT/bxuwZd2t65Jex1faVmyo3SCztHGs9UUzS72TrzT7GRj7azXvygRC9Fx1kuDCRHDVERw8dHGircYuu2XpqSL+iuQwY5pIP8Ql1tD9rJojN/oYm51u5rCRgYA/NyEuPAlloEj1M50Iut6blNeYY3J1sVCwVyTXnjLJupJaFSMs1wS22GHks=
+    - secure: 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
 before_install:
   - sudo apt-get update -q
   - mkdir -p $GOPATH/bin
@@ -17,6 +17,6 @@ deploy:
     skip_cleanup: true
     api_key: $GITHUB_TOKEN
     file_glob: true
-    file: 'dist/*.{tar.gz,zip}'
+    file: "dist/*.{tar.gz,zip}"
     on:
       tags: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.14 AS build
+FROM golang:1.18 AS build
 WORKDIR /go/src/github.com/wantedly/dockertags
 COPY go.mod go.sum ./
 RUN go mod download

Dockerfile-release

@@ -0,0 +1,6 @@
+FROM golang:1.18 AS build
+
+FROM scratch
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY dockertags /bin/dockertags
+ENTRYPOINT ["/bin/dockertags"]

Makefile

@@ -1,5 +1,5 @@
 NAME := dockertags
-VERSION := v0.3.0
+VERSION := v0.3.1
 REVISION := $(shell git rev-parse --short HEAD)
 
 SRCS := $(shell find . -name '*.go' -type f)
@@ -16,6 +16,7 @@ bin/$(NAME): $(SRCS)
 clean:
 	rm -rf bin/*
 	rm -rf dist/*
+	rm -rf build/*
 
 .PHONY: cross-build
 cross-build:

dockerhub.go

@@ -8,15 +8,20 @@ import (
 	"path"
 )
 
+// DockerHubAuthURLBase Docker base auth url
 const DockerHubAuthURLBase = "https://auth.docker.io/token"
+
+// DockerHubAPIURLBase registry url
 const DockerHubAPIURLBase = "https://registry.hub.docker.com/v2/"
 
+// DockerHubAuthResponse struc containing response from dockerhub after authentication
 type DockerHubAuthResponse struct {
 	Token       string `json:"token"`
 	AccessToken string `json:"access_token"`
 	ExpiresIn   int    `json:"expires_in"` // It's always 300 (sec) at this moment
 }
 
+// DockerHubTagsResponse list of tags
 type DockerHubTagsResponse struct {
 	Name string   `json:"name"`
 	Tags []string `json:"tags"`

ecr.go

@@ -10,24 +10,43 @@ import (
 )
 
 func retrieveFromECR(image string) ([]string, error) {
-	svc := ecr.New(session.New())
+	session, err := session.NewSession()
+	allTags := []string{}
+	if err != nil {
+		if aerr, ok := err.(awserr.Error); ok {
+			return nil, aerr
+		}
+		return nil, err
+	}
+
+	svc := ecr.New(session)
 	input := &ecr.DescribeImagesInput{
 		RepositoryName: aws.String(image),
 		Filter: &ecr.DescribeImagesFilter{
 			TagStatus: aws.String("TAGGED"), // extract tagged images only
 		},
 	}
 
-	result, err := svc.DescribeImages(input)
-	if err != nil {
-		if aerr, ok := err.(awserr.Error); ok {
-			return nil, aerr
+  for 	{
+   	result, err := svc.DescribeImages(input)
+   	if err != nil {
+   		if aerr, ok := err.(awserr.Error); ok {
+   			return nil, aerr
+   		}
+   		return nil, err
+   	}
+
+   	tags := extractEcrTagNames(result.ImageDetails)
+		allTags = append(allTags, tags...)
+		// Check if there are more results
+		if result.NextToken == nil {
+			// No more results, break out of the loop
+			break
 		}
-		return nil, err
+		// Set the next token for the next iteration
+		input.NextToken = result.NextToken
 	}
-
-	tags := extractEcrTagNames(result.ImageDetails)
-	return tags, nil
+	return allTags	, nil
 }
 
 func extractEcrTagNames(images []*ecr.ImageDetail) []string {

gcr.go

@@ -37,7 +37,7 @@ func fetchBearer(repo string, image string) (string, error) {
 	url := constructGCRAuthURL(repo, image)
 	body, err := httpGet(url, "", &BasicAuthInfo{
 		Username: "_token",
-		Password: token.AccessToken,
+		Password: token.AccessToken, //pragma: allowlist secret
 	})
 	if err != nil {
 		return "", err
@@ -80,15 +80,16 @@ func parseGCRTagsResponse(manifests gcrTagsResponse) gcrImages {
 }
 
 func extractGCRTagNames(images gcrImages) []string {
-	tags := []string{}
+	var tags []string
 	sort.Slice(images, func(i, j int) bool {
 		return images[i].TimeUploadedMs > images[j].TimeUploadedMs
 	}) // sort Newset -> Oldest
 
 	for _, image := range images {
-		for _, tag := range image.Tag {
-			tags = append(tags, tag)
-		}
+		// for _, tag := range image.Tag {
+		// 	tags = append(tags, tag)
+		// }
+		tags = append(tags, image.Tag...)
 	}
 	return tags
 }

go.mod

@@ -1,10 +1,19 @@
 module dockertags
 
-go 1.14
+go 1.18
 
 require (
-	github.com/aws/aws-sdk-go v1.32.12
-	github.com/docker/distribution v2.7.1+incompatible
+	github.com/aws/aws-sdk-go v1.44.214
+	github.com/docker/distribution v2.8.1+incompatible
+	golang.org/x/oauth2 v0.0.0-20220909003341-f21342109be1
+)
+
+require (
+	cloud.google.com/go/compute v1.10.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
+	golang.org/x/net v0.1.0 // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 )

go.sum

@@ -1,36 +1,66 @@
-cloud.google.com/go v0.34.0 h1:eOI3/cP2VTU6uZLDYAoic+eyzzB9YyGmJ7eIjl8rOPg=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/aws/aws-sdk-go v1.32.12 h1:l/djCeLI4ggBFWLlYUGTqkHraoLnVMubNlLXPdEtoYc=
-github.com/aws/aws-sdk-go v1.32.12/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
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 github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
 github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
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+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
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main.go

@@ -3,17 +3,20 @@ package main
 import (
 	"fmt"
 	"os"
+	"regexp"
 	"strings"
 
 	"github.com/docker/distribution/reference"
 )
 
-const Usage = `Usage:
-  dockertags IMAGENAME
-`
+// Usage string
+const Usage = `Usage: dockertags IMAGENAME [REGEXP]`
 
 func main() {
-	if len(os.Args) != 2 {
+	var tags []string
+	var re *regexp.Regexp
+
+	if len(os.Args) > 3 {
 		fmt.Fprintln(os.Stderr, Usage)
 		os.Exit(1)
 	}
@@ -25,7 +28,9 @@ func main() {
 	}
 	repo, image := reference.SplitHostname(ref)
 
-	var tags []string
+	if len(os.Args) == 3 {
+		re, _ = regexp.Compile(os.Args[2])
+	}
 
 	switch {
 	case repo == "docker.io" || repo == "hub.docker.com":
@@ -37,7 +42,7 @@ func main() {
 
 		tags = t
 	case repo == "quay.io":
-		t, err := retriveFromQuay(image)
+		t, err := retrieveFromQuay(image)
 		if err != nil {
 			fmt.Fprintln(os.Stderr, err)
 			os.Exit(1)
@@ -66,6 +71,10 @@ func main() {
 	}
 
 	for _, tag := range tags {
-		fmt.Println(tag)
+		if re == nil {
+			fmt.Println(tag)
+		} else if re.MatchString(tag) {
+			fmt.Println(tag)
+		}
 	}
 }

quay.go

@@ -7,15 +7,18 @@ import (
 	"path"
 )
 
+// QuayURLBase base repository url
 const QuayURLBase = "https://quay.io/api/v1/repository/"
 
+// QuayTag struct mapped to Quay
 type QuayTag struct {
 	Revision      bool   `json:"revision"`
 	StartTs       int    `json:"start_ts"`
 	Name          string `json:"name"`
 	DockerImageID string `json:"docker_image_id"`
 }
 
+// QuayTagsResponse list of tags from quay
 type QuayTagsResponse struct {
 	HasAdditional bool      `json:"has_additional"`
 	Page          int       `json:"page"`
@@ -33,7 +36,7 @@ func constructQuayURL(image string) (string, error) {
 	return u.String(), nil
 }
 
-func retriveFromQuay(image string) ([]string, error) {
+func retrieveFromQuay(image string) ([]string, error) {
 	url, err := constructQuayURL(image)
 	if err != nil {
 		return nil, err

util.go

@@ -2,17 +2,24 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"io/ioutil"
+	"log"
 	"net/http"
 )
 
+// BasicAuthInfo struct mapping user/pass for base auth
 type BasicAuthInfo struct {
 	Username string
 	Password string
 }
 
 func httpGet(url, apiToken string, basicAuth *BasicAuthInfo) (string, error) {
-	req, _ := http.NewRequest("GET", url, nil)
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
 	if apiToken != "" {
 		req.Header.Set("Authorization", "Bearer "+apiToken)
 	}
@@ -26,16 +33,22 @@ func httpGet(url, apiToken string, basicAuth *BasicAuthInfo) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	defer resp.Body.Close()
+	defer bodyClose(resp.Body) // ignoring error
 
 	b, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return "", err
 	}
 
 	if resp.StatusCode != http.StatusOK {
-		return "", fmt.Errorf("HTTP error!\nURL: %s\nstatus code: %d\nbody:\n%s\n", url, resp.StatusCode, string(b))
+		return "", fmt.Errorf("http error: URL: %s, status code: %d,\nbody:\n%s", url, resp.StatusCode, string(b))
 	}
 
 	return string(b), nil
 }
+
+func bodyClose(c io.Closer) {
+	if err := c.Close(); err != nil {
+		log.Fatal(err)
+	}
+}