Adding upstream version 0.1.0+ds1.upstream/0.1.0+ds1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

22 files changed, 1229 insertions, 0 deletions

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..b4c78be
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule:
+      interval: monthly
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
new file mode 100644
index 0000000..1802da5
--- /dev/null
+++ b/.github/workflows/coverage.yml
@@ -0,0 +1,15 @@
+name: Run coverage
+
+on: [push, pull_request]
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install tools
+        run: sudo apt-get install -qqy bats
+      - name: Run make coverage
+        run: make coverage
+      - name: Run make codecov
+        run: make codecov
diff --git a/.github/workflows/golangci-lint.yml b/.github/workflows/golangci-lint.yml
new file mode 100644
index 0000000..6fb03c8
--- /dev/null
+++ b/.github/workflows/golangci-lint.yml
@@ -0,0 +1,14 @@
+name: golangci-lint
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: latest
+          only-new-issues: true
diff --git a/.github/workflows/markdown-lint.yml b/.github/workflows/markdown-lint.yml
new file mode 100644
index 0000000..65f0c1c
--- /dev/null
+++ b/.github/workflows/markdown-lint.yml
@@ -0,0 +1,20 @@
+name: markdown-lint
+
+on:
+  push:
+    paths:
+      - README.md
+  pull_request:
+    paths:
+      - README.md
+jobs:
+  lint_markdown:
+    name: Run markdown linter
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Lint markdown
+      uses: DavidAnson/markdownlint-cli2-action@v9
+      with:
+        globs: |
+          README.md
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..740ba8f
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,17 @@
+name: Run Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install tools
+        run: sudo apt-get install -qqy shellcheck bats
+      - name: Run make shellcheck
+        run: make shellcheck
+      - name: Run make all
+        run: make all
+      - name: Run make test
+        run: make test
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e038840
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+checkpointctl
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..9df8f61
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,10 @@
+---
+run:
+  concurrency: 6
+  deadline: 5m
+linters:
+  enable:
+    - errorlint
+    - unconvert
+    - gofumpt
+    - unparam
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..8dada3e
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
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+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
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+      Work (including but not limited to damages for loss of goodwill,
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+      other commercial damages or losses), even if such Contributor
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+   you may not use this file except in compliance with the License.
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+   Unless required by applicable law or agreed to in writing, software
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diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..dfc3f02
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,63 @@
+SHELL = /bin/bash
+GO ?= go
+GOPATH := $(shell $(GO) env GOPATH)
+GOBIN := $(shell $(GO) env GOBIN)
+GO_SRC = $(shell find . -name \*.go)
+GO_BUILD = $(GO) build
+NAME = checkpointctl
+COVERAGE_PATH ?= $(shell pwd)/.coverage
+
+all: $(NAME)
+
+$(NAME): $(GO_SRC)
+	$(GO_BUILD) -buildmode=pie -o $@ -ldflags "-X main.name=$(NAME)"
+
+$(NAME).coverage: $(GO_SRC)
+	$(GO) test \
+		-covermode=count \
+		-coverpkg=./... \
+		-mod=vendor \
+		-tags coverage \
+		-buildmode=pie -c -o $@ \
+		-ldflags "-X main.name=$(NAME)"
+
+clean:
+	rm -f $(NAME) $(NAME).coverage $(COVERAGE_PATH)/*
+	if [ -d $(COVERAGE_PATH) ]; then rmdir $(COVERAGE_PATH); fi
+
+golang-lint:
+	golangci-lint run
+
+shellcheck:
+	shellcheck test/*bats
+
+lint: golang-lint shellcheck
+
+test: $(NAME)
+	bats test/*bats
+
+coverage: $(NAME).coverage
+	mkdir -p $(COVERAGE_PATH)
+	COVERAGE_PATH=$(COVERAGE_PATH) COVERAGE=1 bats test/*bats
+
+codecov:
+	curl -Os https://uploader.codecov.io/latest/linux/codecov
+	chmod +x codecov
+	./codecov -f '.coverage/*'
+
+vendor:
+	go mod tidy
+	go mod vendor
+	go mod verify
+
+help:
+	@echo "Usage: make <target>"
+	@echo " * clean - remove artifacts"
+	@echo " * lint - verify the source code (shellcheck/golangci-lint)"
+	@echo " * golang-lint - run golang-lint"
+	@echo " * shellcheck - run shellecheck"
+	@echo " * vendor - update go.mod, go.sum and vendor directory"
+	@echo " * test - run tests"
+	@echo " * help - show help"
+
+.PHONY: clean lint golang-lint shellcheck vendor test help
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bacc897
--- /dev/null
+++ b/README.md
@@ -0,0 +1,105 @@
+<!-- markdownlint-disable MD013 -->
+# checkpointctl -- Show information about checkpoint archives
+
+[![Run Tests](https://github.com/checkpoint-restore/checkpointctl/actions/workflows/tests.yml/badge.svg)](https://github.com/checkpoint-restore/checkpointctl/actions/workflows/tests.yml)
+
+Container engines like *Podman* and *CRI-O* have the ability to checkpoint a
+container.  All data related to a checkpoint is collected in a checkpoint
+archive. With the help of this tool, `checkpointctl`, it is possible to display
+information about these checkpoint archives.
+
+Details on how to create checkpoints with the help of [CRIU][criu] can be found at:
+
+* [Forensic container checkpointing in Kubernetes][forensic]
+* [Podman checkpoint][podman]
+
+To display information about a checkpoint archive you can just use
+`checkpointctl show`:
+
+```console
+$ checkpointctl show /tmp/dump.tar
+
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+|    CONTAINER    |                  IMAGE                   |      ID      | RUNTIME |       CREATED        | ENGINE | CHKPT SIZE | ROOT FS DIFF SIZE |
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+| magical_murdock | quay.io/adrianreber/wildfly-hello:latest | f11d11844af0 | crun    | 2023-02-28T09:43:52Z | Podman | 338.2 MiB  | 177.0 KiB         |
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+```
+
+For a checkpoint archive created by Kubernetes with *CRI-O* the output would
+look like this:
+
+```console
+$ checkpointctl show /var/lib/kubelet/checkpoints/checkpoint-counters_default-counter-2023-02-13T16\:20\:09Z.tar
+
++-----------+------------------------------------+--------------+---------+--------------------------------+--------+------------+------------+
+| CONTAINER |               IMAGE                |      ID      | RUNTIME |            CREATED             | ENGINE |     IP     | CHKPT SIZE |
++-----------+------------------------------------+--------------+---------+--------------------------------+--------+------------+------------+
+| counter   | quay.io/adrianreber/counter:latest | 7eb9680287f1 | runc    | 2023-02-13T16:12:25.843774934Z | CRI-O  | 10.88.0.24 | 8.5 MiB    |
++-----------+------------------------------------+--------------+---------+--------------------------------+--------+------------+------------+
+```
+
+It is also possible to display additional checkpoint related information
+with the parameter `--print-stats`:
+
+```console
+$ checkpointctl show /tmp/dump.tar --print-stats
+
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+|    CONTAINER    |                  IMAGE                   |      ID      | RUNTIME |       CREATED        | ENGINE | CHKPT SIZE | ROOT FS DIFF SIZE |
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+| magical_murdock | quay.io/adrianreber/wildfly-hello:latest | f11d11844af0 | crun    | 2023-02-28T09:43:52Z | Podman | 338.2 MiB  | 177.0 KiB         |
++-----------------+------------------------------------------+--------------+---------+----------------------+--------+------------+-------------------+
+CRIU dump statistics
++---------------+-------------+--------------+---------------+---------------+---------------+
+| FREEZING TIME | FROZEN TIME | MEMDUMP TIME | MEMWRITE TIME | PAGES SCANNED | PAGES WRITTEN |
++---------------+-------------+--------------+---------------+---------------+---------------+
+| 104450 us     | 442148 us   | 212281 us    | 148292 us     |        495649 |         86510 |
++---------------+-------------+--------------+---------------+---------------+---------------+
+```
+
+## How to contribute
+
+While bug fixes can first be identified via an "issue", that is not required.
+It's ok to just open up a PR with the fix, but make sure you include the same
+information you would have included in an issue - like how to reproduce it.
+
+PRs for new features should include some background on what use cases the
+new code is trying to address. When possible and when it makes sense, try to
+break-up larger PRs into smaller ones - it's easier to review smaller
+code changes. But only if those smaller ones make sense as stand-alone PRs.
+
+Regardless of the type of PR, all PRs should include:
+
+* well documented code changes;
+* additional testcases: ideally, they should fail w/o your code change applied;
+* documentation changes.
+
+Squash your commits into logical pieces of work that might want to be reviewed
+separate from the rest of the PRs. Ideally, each commit should implement a
+single idea, and the PR branch should pass the tests at every commit. GitHub
+makes it easy to review the cumulative effect of many commits; so, when in
+doubt, use smaller commits.
+
+PRs that fix issues should include a reference like `Closes #XXXX` in the
+commit message so that github will automatically close the referenced issue
+when the PR is merged.
+
+Contributors must assert that they are in compliance with the [Developer
+Certificate of Origin 1.1](http://developercertificate.org/). This is achieved
+by adding a "Signed-off-by" line containing the contributor's name and e-mail
+to every commit message. Your signature certifies that you wrote the patch or
+otherwise have the right to pass it on as an open-source patch.
+
+## License and copyright
+
+Unless mentioned otherwise in a specific file's header, all code in
+this project is released under the Apache 2.0 license.
+
+The author of a change remains the copyright holder of their code
+(no copyright assignment). The list of authors and contributors can be
+retrieved from the git commit history and in some cases, the file headers.
+
+[forensic]: https://kubernetes.io/blog/2022/12/05/forensic-container-checkpointing-alpha/
+[podman]: https://podman.io/getting-started/checkpoint
+[criu]: https://criu.org/
diff --git a/checkpointctl.go b/checkpointctl.go
new file mode 100644
index 0000000..b02fd81
--- /dev/null
+++ b/checkpointctl.go
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/containers/storage/pkg/archive"
+	"github.com/spf13/cobra"
+)
+
+var (
+	name       string
+	printStats bool
+)
+
+func main() {
+	rootCommand := &cobra.Command{
+		Use:   name,
+		Short: name + " is a tool to read and manipulate checkpoint archives",
+		Long: name + " is a tool to read and manipulate checkpoint archives as " +
+			"created by Podman, CRI-O and containerd",
+		SilenceUsage: true,
+	}
+
+	showCommand := setupShow()
+	rootCommand.AddCommand(showCommand)
+
+	if err := rootCommand.Execute(); err != nil {
+		os.Exit(1)
+	}
+}
+
+func setupShow() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "show",
+		Short: "Show information about available checkpoints",
+		RunE:  show,
+		Args:  cobra.MinimumNArgs(1),
+	}
+	flags := cmd.Flags()
+	flags.BoolVar(
+		&printStats,
+		"print-stats",
+		false,
+		"Print checkpointing statistics if available",
+	)
+
+	return cmd
+}
+
+func show(cmd *cobra.Command, args []string) error {
+	input := args[0]
+	tar, err := os.Stat(input)
+	if err != nil {
+		return err
+	}
+	if !tar.Mode().IsRegular() {
+		return fmt.Errorf("input %s not a regular file", input)
+	}
+	dir, err := os.MkdirTemp("", "checkpointctl")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err := os.RemoveAll(dir); err != nil {
+			fmt.Fprintln(os.Stderr, err)
+		}
+	}()
+
+	if err := archive.UntarPath(input, dir); err != nil {
+		return fmt.Errorf("unpacking of checkpoint archive %s failed: %w", input, err)
+	}
+
+	return showContainerCheckpoint(dir)
+}
diff --git a/checkpointctl_coverage_test.go b/checkpointctl_coverage_test.go
new file mode 100644
index 0000000..a8398d8
--- /dev/null
+++ b/checkpointctl_coverage_test.go
@@ -0,0 +1,40 @@
+//go:build coverage
+// +build coverage
+
+package main
+
+import (
+	"os"
+	"os/signal"
+	"strings"
+	"testing"
+)
+
+// NOTE: do not use this in production.  Binaries built with this file are
+// merely useful to collect coverage data.
+func TestCoverageMain(_ *testing.T) {
+	var args []string
+
+	for _, arg := range os.Args {
+		switch {
+		case strings.HasPrefix(arg, "COVERAGE"):
+			// Dummy argument to enable global flags.
+		case strings.HasPrefix(arg, "-test"):
+			// Make sure we don't pass `go test` specific flags to
+			// checkpointctl.
+		default:
+			args = append(args, arg)
+		}
+	}
+
+	signal.Reset()
+	os.Args = args
+	main() // "run" checkpointctl
+
+	// Make sure that std{err,out} write to /dev/null so we prevent the
+	// testing backend to print "PASS" along with the coverage.  We really
+	// want the coverage to be set via the `-test.coverprofile=$path` flag.
+	null, _ := os.Open(os.DevNull)
+	os.Stdout = null
+	os.Stderr = null
+}
diff --git a/checkpointctl_test.go b/checkpointctl_test.go
new file mode 100644
index 0000000..e5bc078
--- /dev/null
+++ b/checkpointctl_test.go
@@ -0,0 +1,11 @@
+package main_test
+
+import (
+	"testing"
+)
+
+func TestMain(t *testing.T) {
+	// Do nothing. We just need dummy to make `ginkgo` happy. Without that,
+	// `ginkgo` would try to execute the _coverage_test.go _despite_ the
+	t.Parallel()
+}
diff --git a/container.go b/container.go
new file mode 100644
index 0000000..a11be11
--- /dev/null
+++ b/container.go
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: Apache-2.0
+
+// This file is used to handle container checkpoint archives
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	metadata "github.com/checkpoint-restore/checkpointctl/lib"
+	"github.com/checkpoint-restore/go-criu/v6/crit"
+	"github.com/olekukonko/tablewriter"
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+type containerMetadata struct {
+	Name    string `json:"name,omitempty"`
+	Attempt uint32 `json:"attempt,omitempty"`
+}
+
+type containerInfo struct {
+	Name    string
+	IP      string
+	MAC     string
+	Created string
+	Engine  string
+}
+
+func getPodmanInfo(containerConfig *metadata.ContainerConfig, _ *spec.Spec) *containerInfo {
+	return &containerInfo{
+		Name:    containerConfig.Name,
+		Created: containerConfig.CreatedTime.Format(time.RFC3339),
+		Engine:  "Podman",
+	}
+}
+
+func getContainerdInfo(containerdStatus *metadata.ContainerdStatus, specDump *spec.Spec) *containerInfo {
+	return &containerInfo{
+		Name:    specDump.Annotations["io.kubernetes.cri.container-name"],
+		Created: time.Unix(0, containerdStatus.CreatedAt).Format(time.RFC3339),
+		Engine:  "containerd",
+	}
+}
+
+func getCRIOInfo(_ *metadata.ContainerConfig, specDump *spec.Spec) (*containerInfo, error) {
+	cm := containerMetadata{}
+	if err := json.Unmarshal([]byte(specDump.Annotations["io.kubernetes.cri-o.Metadata"]), &cm); err != nil {
+		return nil, fmt.Errorf("failed to read io.kubernetes.cri-o.Metadata: %w", err)
+	}
+
+	return &containerInfo{
+		IP:      specDump.Annotations["io.kubernetes.cri-o.IP.0"],
+		Name:    cm.Name,
+		Created: specDump.Annotations["io.kubernetes.cri-o.Created"],
+		Engine:  "CRI-O",
+	}, nil
+}
+
+func showContainerCheckpoint(checkpointDirectory string) error {
+	var (
+		row []string
+		ci  *containerInfo
+	)
+	containerConfig, _, err := metadata.ReadContainerCheckpointConfigDump(checkpointDirectory)
+	if err != nil {
+		return err
+	}
+	specDump, _, err := metadata.ReadContainerCheckpointSpecDump(checkpointDirectory)
+	if err != nil {
+		return err
+	}
+
+	switch m := specDump.Annotations["io.container.manager"]; m {
+	case "libpod":
+		ci = getPodmanInfo(containerConfig, specDump)
+	case "cri-o":
+		ci, err = getCRIOInfo(containerConfig, specDump)
+	default:
+		containerdStatus, _, _ := metadata.ReadContainerCheckpointStatusFile(checkpointDirectory)
+		if containerdStatus == nil {
+			return fmt.Errorf("unknown container manager found: %s", m)
+		}
+		ci = getContainerdInfo(containerdStatus, specDump)
+	}
+
+	if err != nil {
+		return fmt.Errorf("getting container checkpoint information failed: %w", err)
+	}
+
+	fmt.Printf("\nDisplaying container checkpoint data from %s\n\n", checkpointDirectory)
+
+	table := tablewriter.NewWriter(os.Stdout)
+	header := []string{
+		"Container",
+		"Image",
+		"ID",
+		"Runtime",
+		"Created",
+		"Engine",
+	}
+
+	row = append(row, ci.Name)
+	row = append(row, containerConfig.RootfsImageName)
+	if len(containerConfig.ID) > 12 {
+		row = append(row, containerConfig.ID[:12])
+	} else {
+		row = append(row, containerConfig.ID)
+	}
+
+	row = append(row, containerConfig.OCIRuntime)
+	row = append(row, ci.Created)
+
+	row = append(row, ci.Engine)
+	if ci.IP != "" {
+		header = append(header, "IP")
+		row = append(row, ci.IP)
+	}
+	if ci.MAC != "" {
+		header = append(header, "MAC")
+		row = append(row, ci.MAC)
+	}
+
+	size, err := getCheckpointSize(checkpointDirectory)
+	if err != nil {
+		return err
+	}
+
+	header = append(header, "CHKPT Size")
+	row = append(row, metadata.ByteToString(size))
+
+	// Display root fs diff size if available
+	fi, err := os.Lstat(filepath.Join(checkpointDirectory, metadata.RootFsDiffTar))
+	if err == nil {
+		if fi.Size() != 0 {
+			header = append(header, "Root Fs Diff Size")
+			row = append(row, metadata.ByteToString(fi.Size()))
+		}
+	}
+
+	table.SetAutoMergeCells(true)
+	table.SetRowLine(true)
+	table.SetHeader(header)
+	table.Append(row)
+	table.Render()
+
+	if !printStats {
+		return nil
+	}
+
+	cpDir, err := os.Open(checkpointDirectory)
+	if err != nil {
+		return err
+	}
+	defer cpDir.Close()
+
+	// Get dump statistics with crit
+	dumpStatistics, err := crit.GetDumpStats(cpDir.Name())
+	if err != nil {
+		return fmt.Errorf("unable to display checkpointing statistics: %w", err)
+	}
+
+	table = tablewriter.NewWriter(os.Stdout)
+	table.SetHeader([]string{
+		"Freezing Time",
+		"Frozen Time",
+		"Memdump Time",
+		"Memwrite Time",
+		"Pages Scanned",
+		"Pages Written",
+	})
+	table.Append([]string{
+		fmt.Sprintf("%d us", dumpStatistics.GetFreezingTime()),
+		fmt.Sprintf("%d us", dumpStatistics.GetFrozenTime()),
+		fmt.Sprintf("%d us", dumpStatistics.GetMemdumpTime()),
+		fmt.Sprintf("%d us", dumpStatistics.GetMemwriteTime()),
+		fmt.Sprintf("%d", dumpStatistics.GetPagesScanned()),
+		fmt.Sprintf("%d", dumpStatistics.GetPagesWritten()),
+	})
+	fmt.Println("CRIU dump statistics")
+	table.Render()
+
+	return nil
+}
+
+func dirSize(path string) (size int64, err error) {
+	err = filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() {
+			size += info.Size()
+		}
+
+		return err
+	})
+
+	return size, err
+}
+
+func getCheckpointSize(path string) (size int64, err error) {
+	dir := filepath.Join(path, metadata.CheckpointDirectory)
+
+	return dirSize(dir)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..68ebf35
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,29 @@
+module github.com/checkpoint-restore/checkpointctl
+
+go 1.18
+
+require (
+	github.com/checkpoint-restore/go-criu/v6 v6.3.0
+	github.com/containers/storage v1.45.3
+	github.com/olekukonko/tablewriter v0.0.5
+	github.com/opencontainers/runtime-spec v1.0.3-0.20210326190908-1c3f411f0417
+	github.com/spf13/cobra v1.6.1
+)
+
+require (
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.1 // indirect
+	github.com/klauspost/compress v1.15.14 // indirect
+	github.com/klauspost/pgzip v1.2.5 // indirect
+	github.com/mattn/go-runewidth v0.0.9 // indirect
+	github.com/moby/sys/mountinfo v0.6.2 // indirect
+	github.com/opencontainers/runc v1.1.4 // indirect
+	github.com/sirupsen/logrus v1.9.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/syndtr/gocapability v0.0.0-20200815063812-42c35b437635 // indirect
+	github.com/ulikunitz/xz v0.5.11 // indirect
+	golang.org/x/net v0.0.0-20210825183410-e898025ed96a // indirect
+	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..ab70b60
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,103 @@
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/checkpoint-restore/go-criu/v5 v5.3.0/go.mod h1:E/eQpaFtUKGOOSEBZgmKAcn+zUUwWxqcaKZlF54wK8E=
+github.com/checkpoint-restore/go-criu/v6 v6.3.0 h1:mIdrSO2cPNWQY1truPg6uHLXyKHk3Z5Odx4wjKOASzA=
+github.com/checkpoint-restore/go-criu/v6 v6.3.0/go.mod h1:rrRTN/uSwY2X+BPRl/gkulo9gsKOSAeVp9/K2tv7xZI=
+github.com/cilium/ebpf v0.7.0/go.mod h1:/oI2+1shJiTGAMgl6/RgJr36Eo1jzrRcAWbcXO2usCA=
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+golang.org/x/sys v0.0.0-20211116061358-0a5406a5449c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/lib/metadata.go b/lib/metadata.go
new file mode 100644
index 0000000..7339ac9
--- /dev/null
+++ b/lib/metadata.go
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package metadata
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+const (
+	// container archive
+	ConfigDumpFile             = "config.dump"
+	SpecDumpFile               = "spec.dump"
+	NetworkStatusFile          = "network.status"
+	CheckpointDirectory        = "checkpoint"
+	CheckpointVolumesDirectory = "volumes"
+	DevShmCheckpointTar        = "devshm-checkpoint.tar"
+	RootFsDiffTar              = "rootfs-diff.tar"
+	DeletedFilesFile           = "deleted.files"
+	DumpLogFile                = "dump.log"
+	RestoreLogFile             = "restore.log"
+	// pod archive
+	PodOptionsFile = "pod.options"
+	PodDumpFile    = "pod.dump"
+	// containerd only
+	StatusFile = "status"
+)
+
+// This is a reduced copy of what Podman uses to store checkpoint metadata
+type ContainerConfig struct {
+	ID              string    `json:"id"`
+	Name            string    `json:"name"`
+	RootfsImage     string    `json:"rootfsImage,omitempty"`
+	RootfsImageRef  string    `json:"rootfsImageRef,omitempty"`
+	RootfsImageName string    `json:"rootfsImageName,omitempty"`
+	OCIRuntime      string    `json:"runtime,omitempty"`
+	CreatedTime     time.Time `json:"createdTime"`
+	CheckpointedAt  time.Time `json:"checkpointedTime"`
+	RestoredAt      time.Time `json:"restoredTime"`
+	Restored        bool      `json:"restored"`
+}
+
+type ContainerdStatus struct {
+	CreatedAt  int64
+	StartedAt  int64
+	FinishedAt int64
+	ExitCode   int32
+	Pid        uint32
+	Reason     string
+	Message    string
+}
+
+// This structure is used by the KubernetesContainerCheckpointMetadata structure
+type KubernetesCheckpoint struct {
+	Archive   string `json:"archive,omitempty"`
+	Size      int64  `json:"size,omitempty"`
+	Timestamp int64  `json:"timestamp,omitempty"`
+}
+
+// This structure is the basis for Kubernetes to track how many checkpoints
+// for a certain container have been created.
+type KubernetesContainerCheckpointMetadata struct {
+	PodFullName   string                 `json:"podFullName,omitempty"`
+	ContainerName string                 `json:"containerName,omitempty"`
+	TotalSize     int64                  `json:"totalSize,omitempty"`
+	Checkpoints   []KubernetesCheckpoint `json:"checkpoints"`
+}
+
+func ReadContainerCheckpointSpecDump(checkpointDirectory string) (*spec.Spec, string, error) {
+	var specDump spec.Spec
+	specDumpFile, err := ReadJSONFile(&specDump, checkpointDirectory, SpecDumpFile)
+
+	return &specDump, specDumpFile, err
+}
+
+func ReadContainerCheckpointConfigDump(checkpointDirectory string) (*ContainerConfig, string, error) {
+	var containerConfig ContainerConfig
+	configDumpFile, err := ReadJSONFile(&containerConfig, checkpointDirectory, ConfigDumpFile)
+
+	return &containerConfig, configDumpFile, err
+}
+
+func ReadContainerCheckpointDeletedFiles(checkpointDirectory string) ([]string, string, error) {
+	var deletedFiles []string
+	deletedFilesFile, err := ReadJSONFile(&deletedFiles, checkpointDirectory, DeletedFilesFile)
+
+	return deletedFiles, deletedFilesFile, err
+}
+
+func ReadContainerCheckpointStatusFile(checkpointDirectory string) (*ContainerdStatus, string, error) {
+	var containerdStatus ContainerdStatus
+	statusFile, err := ReadJSONFile(&containerdStatus, checkpointDirectory, StatusFile)
+
+	return &containerdStatus, statusFile, err
+}
+
+// WriteJSONFile marshalls and writes the given data to a JSON file
+func WriteJSONFile(v interface{}, dir, file string) (string, error) {
+	fileJSON, err := json.MarshalIndent(v, "", "  ")
+	if err != nil {
+		return "", fmt.Errorf("error marshalling JSON: %w", err)
+	}
+	file = filepath.Join(dir, file)
+	if err := os.WriteFile(file, fileJSON, 0o600); err != nil {
+		return "", err
+	}
+
+	return file, nil
+}
+
+func ReadJSONFile(v interface{}, dir, file string) (string, error) {
+	file = filepath.Join(dir, file)
+	content, err := os.ReadFile(file)
+	if err != nil {
+		return "", err
+	}
+	if err = json.Unmarshal(content, v); err != nil {
+		return "", fmt.Errorf("failed to unmarshal %s: %w", file, err)
+	}
+
+	return file, nil
+}
+
+func ByteToString(b int64) string {
+	const unit = 1024
+	if b < unit {
+		return fmt.Sprintf("%d B", b)
+	}
+	div, exp := int64(unit), 0
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+
+	return fmt.Sprintf("%.1f %ciB",
+		float64(b)/float64(div), "KMGTPE"[exp])
+}
diff --git a/test/checkpointctl.bats b/test/checkpointctl.bats
new file mode 100644
index 0000000..0e96b43
--- /dev/null
+++ b/test/checkpointctl.bats
@@ -0,0 +1,156 @@
+if [ -n "$COVERAGE" ]; then
+	CHECKPOINTCTL="./checkpointctl.coverage"
+	ARGS="-test.coverprofile=coverprofile.integration.$RANDOM -test.outputdir=${COVERAGE_PATH} COVERAGE"
+else
+	CHECKPOINTCTL="./checkpointctl"
+fi
+TEST_TMP_DIR1=""
+TEST_TMP_DIR2=""
+
+function checkpointctl() {
+	# shellcheck disable=SC2086
+	run $CHECKPOINTCTL $ARGS "$@"
+	echo "$output"
+}
+
+function setup() {
+	TEST_TMP_DIR1=$(mktemp -d)
+	TEST_TMP_DIR2=$(mktemp -d)
+}
+
+function teardown() {
+	[ "$TEST_TMP_DIR1" != "" ] && rm -rf "$TEST_TMP_DIR1"
+	[ "$TEST_TMP_DIR2" != "" ] && rm -rf "$TEST_TMP_DIR2"
+}
+
+@test "Run checkpointctl" {
+	checkpointctl
+	[ "$status" -eq 0 ]
+}
+
+@test "Run checkpointctl with wrong parameter" {
+	checkpointctl --wrong-parameter
+	[ "$status" -eq 1 ]
+	[ "$output" = "Error: unknown flag: --wrong-parameter" ]
+}
+
+@test "Run checkpointctl show with non existing directory" {
+	checkpointctl show /does-not-exist
+	[ "$status" -eq 1 ]
+	[[ ${lines[0]} = "Error: stat /does-not-exist: no such file or directory" ]]
+}
+
+@test "Run checkpointctl show with empty tar file" {
+	touch "$TEST_TMP_DIR1"/empty.tar
+	checkpointctl show "$TEST_TMP_DIR1"/empty.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[0]} == *"config.dump: no such file or directory"* ]]
+}
+
+@test "Run checkpointctl show with tar file with empty config.dump" {
+	touch "$TEST_TMP_DIR1"/config.dump
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[0]} == *"config.dump: unexpected end of JSON input" ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and no spec.dump" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[0]} == *"spec.dump: no such file or directory" ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and empty spec.dump" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	touch "$TEST_TMP_DIR1"/spec.dump
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[0]} == *"spec.dump: unexpected end of JSON input" ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and valid spec.dump and no checkpoint directory" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[1]} == *"checkpoint: no such file or directory" ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and valid spec.dump and checkpoint directory" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 0 ]
+	[[ ${lines[4]} == *"Podman"* ]]
+}
+
+@test "Run checkpointctl show with tar file from containerd with valid config.dump and valid spec.dump and checkpoint directory" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	echo "{}" > "$TEST_TMP_DIR1"/status
+	echo "{}" >  "$TEST_TMP_DIR1"/spec.dump
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 0 ]
+	[[ ${lines[4]} == *"containerd"* ]]
+}
+
+@test "Run checkpointctl show with tar file and --print-stats and missing stats-dump" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar --print-stats
+	[ "$status" -eq 1 ]
+	[[ ${lines[6]} == *"unable to display checkpointing statistics"* ]]
+}
+
+@test "Run checkpointctl show with tar file and --print-stats and invalid stats-dump" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"/stats-dump
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar --print-stats
+	[ "$status" -eq 1 ]
+	[[ ${lines[6]} == *"Unknown magic"* ]]
+}
+
+@test "Run checkpointctl show with tar file and --print-stats and valid stats-dump" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump "$TEST_TMP_DIR1"
+	cp test/stats-dump "$TEST_TMP_DIR1"
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar --print-stats
+	[ "$status" -eq 0 ]
+	[[ ${lines[6]} == *"CRIU dump statistics"* ]]
+	[[ ${lines[8]} == *"MEMWRITE TIME"* ]]
+	[[ ${lines[10]} == *"446571 us"* ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and valid spec.dump (CRI-O) and no checkpoint directory" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump.cri-o "$TEST_TMP_DIR1"/spec.dump
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 1 ]
+	[[ ${lines[1]} == *"checkpoint: no such file or directory"* ]]
+}
+
+@test "Run checkpointctl show with tar file with valid config.dump and valid spec.dump (CRI-O) and checkpoint directory" {
+	cp test/config.dump "$TEST_TMP_DIR1"
+	cp test/spec.dump.cri-o "$TEST_TMP_DIR1"/spec.dump
+	mkdir "$TEST_TMP_DIR1"/checkpoint
+	( cd "$TEST_TMP_DIR1" && tar cf "$TEST_TMP_DIR2"/test.tar . )
+	checkpointctl show "$TEST_TMP_DIR2"/test.tar
+	[ "$status" -eq 0 ]
+	[[ ${lines[4]} == *"CRI-O"* ]]
+}
diff --git a/test/config.dump b/test/config.dump
new file mode 100644
index 0000000..2c63c08
--- /dev/null
+++ b/test/config.dump
@@ -0,0 +1,2 @@
+{
+}
diff --git a/test/spec.dump b/test/spec.dump
new file mode 100644
index 0000000..237795b
--- /dev/null
+++ b/test/spec.dump
@@ -0,0 +1,3 @@
+{
+"annotations": {"io.container.manager": "libpod"}
+}
diff --git a/test/spec.dump.cri-o b/test/spec.dump.cri-o
new file mode 100644
index 0000000..17079ec
--- /dev/null
+++ b/test/spec.dump.cri-o
@@ -0,0 +1,6 @@
+{
+  "annotations": {
+    "io.container.manager": "cri-o",
+    "io.kubernetes.cri-o.Metadata" : "{}"
+  }
+}
diff --git a/test/stats-dump b/test/stats-dump
new file mode 100644
index 0000000..455fe98
--- /dev/null
+++ b/test/stats-dump