From 0719aff7b6d2ceccdca6ba6a71e3539e45616dc7 Mon Sep 17 00:00:00 2001 From: Sergei Kondrashov Date: Mon, 15 Jul 2024 18:47:39 +0200 Subject: [PATCH] initial --- .gitignore | 3 + Makefile | 8 + README.md | 36 +++++ cmd/main.go | 78 ++++++++++ go.mod | 73 +++++++++ go.sum | 291 +++++++++++++++++++++++++++++++++++ internal/docker/layers.go | 108 +++++++++++++ internal/docker/main.go | 55 +++++++ internal/docker/run_cli.go | 19 +++ internal/docker/tree.go | 155 +++++++++++++++++++ internal/docker/tree_test.go | 128 +++++++++++++++ 11 files changed, 954 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 README.md create mode 100644 cmd/main.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 internal/docker/layers.go create mode 100644 internal/docker/main.go create mode 100644 internal/docker/run_cli.go create mode 100644 internal/docker/tree.go create mode 100644 internal/docker/tree_test.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..609a003 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +.idea/ +docker-tree +Dockerfile diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..061993f --- /dev/null +++ b/Makefile @@ -0,0 +1,8 @@ +VERSION := 0.0.1 + +build: test + go build -ldflags="-X 'main.version=$(VERSION)'" -o docker-tree ./cmd/ + +test: + go vet ./... + go test -v ./... diff --git a/README.md b/README.md new file mode 100644 index 0000000..9639ac4 --- /dev/null +++ b/README.md @@ -0,0 +1,36 @@ +# docker-tree + +[//]: # ([![GitHub release](https://img.shields.io/github/release/sergkondr/docker-tree.svg)](https://github.com/sergkondr/docker-tree/releases/latest)) +[//]: # ([![Go Report Card](https://goreportcard.com/badge/github.com/sergkondr/docker-tree)](https://goreportcard.com/report/github.com/sergkondr/docker-tree)) +[![License: MIT](https://img.shields.io/badge/License-MIT%202.0-blue.svg)](https://github.com/wagoodman/dive/blob/main/LICENSE) + +This command shows the directory tree of a Docker image, like the 'tree' command. +Provide the image name and an optional tag or digest to view the file structure inside the image. +You can also specify a directory to see the file tree relative to this directory. + +This is not a replacement for the amazing [Dive](https://github.com/wagoodman/dive) utility, but it works as a Docker plugin, so you might find it simpler and more convenient +Think of this app mainly as an attempt to understand how Docker images work and how to create Docker plugins. However, it does work, and I hope you find it useful. + +### Install +``` +cp ./docker-tree ~/.docker/cli-plugins/docker-tree +``` + +### Usage +```shell +➜ docker tree alpine:3.20 /etc/ssl +3.20: Pulling from library/alpine +a258b2a6b59a: Pull complete +Digest: sha256:b89d9c93e9ed3597455c90a0b88a8bbb5cb7188438f70953fede212a0c4394e0 +Status: Downloaded newer image for alpine:3.20 +docker.io/library/alpine:3.20 +ssl/ +├── cert.pem +├── certs/ +│ └── ca-certificates.crt +├── ct_log_list.cnf +├── ct_log_list.cnf.dist +├── openssl.cnf +├── openssl.cnf.dist +└── private/ +``` diff --git a/cmd/main.go b/cmd/main.go new file mode 100644 index 0000000..a8ba789 --- /dev/null +++ b/cmd/main.go @@ -0,0 +1,78 @@ +package main + +import ( + "fmt" + "os" + + "github.com/skondrashov/docker-tree/internal/docker" + + "github.com/docker/cli/cli-plugins/manager" + "github.com/docker/cli/cli-plugins/plugin" + "github.com/docker/cli/cli/command" + "github.com/spf13/cobra" +) + +var ( + version string +) + +func main() { + plugin.Run( + func(dockerCli command.Cli) *cobra.Command { + var ( + quiet bool + ) + + cmd := &cobra.Command{ + Use: "tree NAME[:TAG|@DIGEST] [DIRECTORY]", + Short: "Display the directory tree of a Docker image", + Long: `This command displays the directory tree of a Docker image, similar to the 'tree' command. +Provide the image name and an optional tag or digest to view the file structure within the image. +You can also specify a directory to see the file tree relative to this directory.`, + Run: func(cmd *cobra.Command, args []string) { + if len(args) == 0 || len(args) > 2 { + fmt.Fprintln(dockerCli.Out(), cmd.UsageString()) + os.Exit(0) + } + + imageID := args[0] + if imageID == "" { + fmt.Fprintln(dockerCli.Out(), "no imageID provided") + os.Exit(1) + } + + treeRoot := "/" + if len(args) == 2 && args[1] != "" { + treeRoot = args[1] + } + + treeStrings, err := docker.GetImageTree(docker.GetTreeOpts{ + Cli: dockerCli, + ImageID: imageID, + Quiet: quiet, + TreeRoot: treeRoot, + }) + if err != nil { + fmt.Fprintf(dockerCli.Err(), "can't get image tree: %s\n", err) + os.Exit(1) + } + + fmt.Fprintf(dockerCli.Out(), "%s", treeStrings) + }, + } + + flags := cmd.Flags() + flags.BoolVarP(&quiet, "quiet", "q", false, "Suppress verbose output") + + cmd.AddCommand() + return cmd + }, + + manager.Metadata{ + SchemaVersion: "0.1.0", + Vendor: "Sergei Kondrashov", + Version: version, + ShortDescription: "Docker image tree", + URL: "https://github.com/sergkondr/docker-tree", + }) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..ba998ba --- /dev/null +++ b/go.mod @@ -0,0 +1,73 @@ +module github.com/skondrashov/docker-tree + +go 1.22.1 + +require ( + github.com/docker/cli v27.0.3+incompatible + github.com/docker/docker v27.0.3+incompatible + github.com/spf13/cobra v1.8.1 +) + +require ( + github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect + github.com/Microsoft/go-winio v0.4.14 // indirect + github.com/beorn7/perks v0.0.0-20150223135152-b965b613227f // indirect + github.com/cenkalti/backoff/v4 v4.3.0 // indirect + github.com/containerd/log v0.1.0 // indirect + github.com/distribution/reference v0.6.0 // indirect + github.com/docker/distribution v2.8.3+incompatible // indirect + github.com/docker/docker-credential-helpers v0.8.2 // indirect + github.com/docker/go v1.5.1-1.0.20160303222718-d30aec9fd63c // indirect + github.com/docker/go-connections v0.5.0 // indirect + github.com/docker/go-metrics v0.0.0-20180209012529-399ea8c73916 // indirect + github.com/docker/go-units v0.5.0 // indirect + github.com/felixge/httpsnoop v1.0.4 // indirect + github.com/fvbommel/sortorder v1.1.0 // indirect + github.com/go-logr/logr v1.4.2 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.4 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/gorilla/mux v1.7.0 // indirect + github.com/grpc-ecosystem/grpc-gateway/v2 v2.20.0 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect + github.com/miekg/pkcs11 v1.0.2 // indirect + github.com/moby/docker-image-spec v1.3.1 // indirect + github.com/moby/sys/sequential v0.5.0 // indirect + github.com/moby/term v0.5.0 // indirect + github.com/morikuni/aec v1.0.0 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.1.0 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v0.9.0-pre1.0.20180209125602-c332b6f63c06 // indirect + github.com/prometheus/client_model v0.0.0-20171117100541-99fa1f4be8e5 // indirect + github.com/prometheus/common v0.0.0-20180110214958-89604d197083 // indirect + github.com/prometheus/procfs v0.0.0-20180125133057-cb4147076ac7 // indirect + github.com/sirupsen/logrus v1.9.3 // indirect + github.com/spf13/pflag v1.0.5 // indirect + github.com/theupdateframework/notary v0.7.0 // indirect + go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0 // indirect + go.opentelemetry.io/otel v1.28.0 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.28.0 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.28.0 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.28.0 // indirect + go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.28.0 // indirect + go.opentelemetry.io/otel/metric v1.28.0 // indirect + go.opentelemetry.io/otel/sdk v1.28.0 // indirect + go.opentelemetry.io/otel/sdk/metric v1.28.0 // indirect + go.opentelemetry.io/otel/trace v1.28.0 // indirect + go.opentelemetry.io/proto/otlp v1.3.1 // indirect + golang.org/x/crypto v0.24.0 // indirect + golang.org/x/net v0.26.0 // indirect + golang.org/x/sync v0.7.0 // indirect + golang.org/x/sys v0.22.0 // indirect + golang.org/x/term v0.21.0 // indirect + golang.org/x/text v0.16.0 // indirect + golang.org/x/time v0.5.0 // indirect + google.golang.org/genproto/googleapis/api v0.0.0-20240701130421-f6361c86f094 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20240701130421-f6361c86f094 // indirect + google.golang.org/grpc v1.64.0 // indirect + google.golang.org/protobuf v1.34.2 // indirect + gotest.tools/v3 v3.5.1 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..0fbefe8 --- /dev/null +++ b/go.sum @@ -0,0 +1,291 @@ +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E= +github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/Microsoft/go-winio v0.4.14 h1:+hMXMk01us9KgxGb7ftKQt2Xpf5hH/yky+TDA+qxleU= +github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA= +github.com/Shopify/logrus-bugsnag v0.0.0-20170309145241-6dbc35f2c30d h1:hi6J4K6DKrR4/ljxn6SF6nURyu785wKMuQcjt7H3VCQ= +github.com/Shopify/logrus-bugsnag v0.0.0-20170309145241-6dbc35f2c30d/go.mod h1:HI8ITrYtUY+O+ZhtlqUnD8+KwNPOyugEhfP9fdUIaEQ= +github.com/beorn7/perks v0.0.0-20150223135152-b965b613227f h1:L/FlB1krOjojJSmUaiAiOMiIdRWylhc9QcHg0vHBuzA= +github.com/beorn7/perks v0.0.0-20150223135152-b965b613227f/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= +github.com/bitly/go-hostpool v0.1.0/go.mod h1:4gOCgp6+NZnVqlKyZ/iBZFTAJKembaVENUpMkpg42fw= +github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA= +github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4= +github.com/bugsnag/bugsnag-go v1.0.5-0.20150529004307-13fd6b8acda0 h1:s7+5BfS4WFJoVF9pnB8kBk03S7pZXRdKamnV0FOl5Sc= +github.com/bugsnag/bugsnag-go v1.0.5-0.20150529004307-13fd6b8acda0/go.mod h1:2oa8nejYd4cQ/b0hMIopN0lCRxU0bueqREvZLWFrtK8= +github.com/bugsnag/osext v0.0.0-20130617224835-0dd3f918b21b h1:otBG+dV+YK+Soembjv71DPz3uX/V/6MMlSyD9JBQ6kQ= +github.com/bugsnag/osext v0.0.0-20130617224835-0dd3f918b21b/go.mod h1:obH5gd0BsqsP2LwDJ9aOkm/6J86V6lyAXCoQWGw3K50= +github.com/bugsnag/panicwrap v0.0.0-20151223152923-e2c28503fcd0 h1:nvj0OLI3YqYXer/kZD8Ri1aaunCxIEsOst1BVJswV0o= +github.com/bugsnag/panicwrap v0.0.0-20151223152923-e2c28503fcd0/go.mod h1:D/8v3kj0zr8ZAKg1AQ6crr+5VwKN5eIywRkfhyM/+dE= +github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8= +github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE= +github.com/cloudflare/cfssl v0.0.0-20180223231731-4e2dcbde5004 h1:lkAMpLVBDaj17e85keuznYcH5rqI438v41pKcBl4ZxQ= +github.com/cloudflare/cfssl v0.0.0-20180223231731-4e2dcbde5004/go.mod h1:yMWuSON2oQp+43nFtAV/uvKQIFpSPerB57DCt9t8sSA= +github.com/containerd/log v0.1.0 h1:TCJt7ioM2cr/tfR8GPbGf9/VRAX8D2B4PjzCpfX540I= +github.com/containerd/log v0.1.0/go.mod h1:VRRf09a7mHDIRezVKTRCrOq78v577GXq3bSa3EhrzVo= +github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY= +github.com/creack/pty v1.1.18/go.mod h1:MOBLtS5ELjhRRrroQr9kyvTxUAFNvYEK993ew/Vr4O4= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/denisenkom/go-mssqldb v0.0.0-20191128021309-1d7a30a10f73/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU= +github.com/distribution/reference v0.6.0 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string + FileTree *fileTreeNode +} + +func checkImageExists(cli command.Cli, imageID string) (bool, error) { + images, err := cli.Client().ImageList(context.Background(), image.ListOptions{}) + if err != nil { + return false, fmt.Errorf("can't list images: %w", err) + } + + for _, img := range images { + for _, t := range img.RepoTags { + if t == imageID { + return true, nil + } + } + } + + return false, nil +} + +func getLayersOrderedArrFromImage(cli command.Cli, imageID string) ([]string, error) { + imageInspect, _, err := cli.Client().ImageInspectWithRaw(context.Background(), imageID) + if err != nil { + return nil, fmt.Errorf("can't inspect image: %w", err) + } + + layersOrderedArr := make([]string, len(imageInspect.RootFS.Layers)) + for i, layer := range imageInspect.RootFS.Layers { + layersOrderedArr[i] = fmt.Sprintf("%s", strings.Split(layer, ":")[1]) + } + + return layersOrderedArr, nil +} + +func readLayers(cli command.Cli, imageID string, layersOrderedArr []string) (map[string]layer, error) { + imageReader, err := cli.Client().ImageSave(context.Background(), []string{imageID}) + if err != nil { + return nil, fmt.Errorf("error saving image: %v", err) + } + defer imageReader.Close() + + tarReader := tar.NewReader(imageReader) + filesInImage := make(map[string]layer, len(layersOrderedArr)) + for { + header, err := tarReader.Next() + if err == io.EOF { + break + } + + if err != nil { + return nil, fmt.Errorf("error reading tar header: %w", err) + } + + fileName := header.Name + if header.Typeflag == tar.TypeReg { //|| header.Typeflag == tar.TypeSymlink { + fName := strings.TrimPrefix(fileName, "blobs/sha256/") + if slices.Contains(layersOrderedArr, fName) { + layerReader := tar.NewReader(tarReader) + files, err := getFileTreeFromLayer(layerReader) + if err != nil { + return nil, fmt.Errorf("error getting files from layer: %w", err) + } + + filesInImage[fName] = layer{ + ID: fileName, + FileTree: files, + } + } + } + } + + return filesInImage, nil +} + +func getFileTreeFromLayer(layerReader *tar.Reader) (*fileTreeNode, error) { + fileTree := &fileTreeNode{"/", true, make([]*fileTreeNode, 0)} + + for { + header, err := layerReader.Next() + if err == io.EOF { + break + } + + if err != nil { + return nil, fmt.Errorf("error reading tar header: %w", err) + } + + fileTree.addChild(header) + } + + return fileTree, nil +} diff --git a/internal/docker/main.go b/internal/docker/main.go new file mode 100644 index 0000000..cf209d5 --- /dev/null +++ b/internal/docker/main.go @@ -0,0 +1,55 @@ +package docker + +import ( + "fmt" + + "github.com/docker/cli/cli/command" +) + +type GetTreeOpts struct { + Cli command.Cli + ImageID string + Quiet bool + TreeRoot string +} + +func GetImageTree(opts GetTreeOpts) (string, error) { + imageExists, err := checkImageExists(opts.Cli, opts.ImageID) + if err != nil { + return "", fmt.Errorf("can't check if image exists: %w", err) + } + + if !imageExists { + args := []string{"pull", opts.ImageID} + if opts.Quiet { + args = append(args, "--quiet") + } + envs := []string{"DOCKER_CLI_HINTS=false"} + if err = runDockerCliCommand(args, envs); err != nil { + return "", fmt.Errorf("error inspecting image: %w", err) + } + } + + layersOrderedArr, err := getLayersOrderedArrFromImage(opts.Cli, opts.ImageID) + if err != nil { + return "", fmt.Errorf("can't get layersOrderedArr: %w", err) + } + + layerMap, err := readLayers(opts.Cli, opts.ImageID, layersOrderedArr) + if err != nil { + return "", fmt.Errorf("can't read layer: %w", err) + } + + originalLayer := layerMap[layersOrderedArr[0]].FileTree + for i := 1; i <= len(layersOrderedArr)-1; i++ { + updatedLayer := layerMap[layersOrderedArr[i]].FileTree + originalLayer, _ = mergeFileTrees(originalLayer, updatedLayer) + } + + node := originalLayer.findNode(opts.TreeRoot) + if node == nil { + return "", fmt.Errorf("tree is no such path in the image: %s", opts.TreeRoot) + } + + return node.String(), nil +} diff --git a/internal/docker/run_cli.go b/internal/docker/run_cli.go new file mode 100644 index 0000000..29f9077 --- /dev/null +++ b/internal/docker/run_cli.go @@ -0,0 +1,19 @@ +package docker + +import ( + "os" + "os/exec" +) + +// unfortunately, we need this to pull an image, because we can't call pull method directly +// due to unexported parameters of the method, so it is impossible to specify the image outside the docker package +func runDockerCliCommand(args, env []string) error { + cmd := exec.Command("docker", args...) + cmd.Env = append(os.Environ(), env...) + + cmd.Stdout = os.Stdout + cmd.Stderr = os.Stderr + cmd.Stdin = os.Stdin + + return cmd.Run() +} diff --git a/internal/docker/tree.go b/internal/docker/tree.go new file mode 100644 index 0000000..82b2159 --- /dev/null +++ b/internal/docker/tree.go @@ -0,0 +1,155 @@ +package docker + +import ( + "archive/tar" + "fmt" + "sort" + "strings" +) + +const ( + empty = "" + space = " " + branch = "│ " + middle = "├── " + last = "└── " + + delFilePrefix = ".wh." +) + +type fileTreeNode struct { + Name string + IsDir bool + Children []*fileTreeNode +} + +func (n *fileTreeNode) String() string { + return n.getString("", true, true) +} + +func (n *fileTreeNode) getString(prefix string, isFirst, isLast bool) string { + passPrefix := prefix + currentPrefix := empty + + if !isFirst { + if isLast { + currentPrefix = last + passPrefix += space + } else { + passPrefix += branch + currentPrefix = middle + } + } + + name := n.Name + if n.IsDir && n.Name != "/" { + name += "/" + } + + result := fmt.Sprintf("%s%s%s\n", prefix, currentPrefix, name) + + for i, child := range n.Children { + result += child.getString(passPrefix, false, i == len(n.Children)-1) + } + + return result +} + +func (n *fileTreeNode) addChild(file *tar.Header) { + pathDirs := strings.Split(file.Name, "/") + + for _, dir := range pathDirs { + if dir == "" { + continue + } + + childIndex := n.findChild(dir) + if childIndex != -1 { + n = n.Children[childIndex] + continue + } + + child := &fileTreeNode{ + Name: dir, + IsDir: file.Typeflag == tar.TypeDir, + } + n.Children = append(n.Children, child) + } +} + +func (n *fileTreeNode) findChild(name string) int { + for i, child := range n.Children { + if child.Name == name { + return i + } + } + return -1 +} + +func (n *fileTreeNode) findNode(path string) *fileTreeNode { + pathDirs := strings.Split(path, "/") + for _, dir := range pathDirs { + if dir == "" { + continue + } + + childIndex := n.findChild(dir) + if childIndex == -1 { + return nil + } + n = n.Children[childIndex] + } + return n +} + +func mergeFileTrees(original, updated *fileTreeNode) (*fileTreeNode, error) { + if original == updated || updated == nil { + return original, nil + } + if original == nil { + return updated, nil + } + + merged := &fileTreeNode{original.Name, original.IsDir, original.Children} + + for _, updatedChild := range updated.Children { + // to avoid "/./" in tree for distroless images + if updatedChild.Name == "." { + continue + } + + if strings.HasPrefix(updatedChild.Name, delFilePrefix) { + updatedChild.Name = strings.TrimPrefix(updatedChild.Name, delFilePrefix) + err := original.deleteNode(updatedChild) + if err != nil { + return nil, fmt.Errorf("error deleting file %s: %w", updatedChild.Name, err) + } + continue + } + + childIndex := merged.findChild(updatedChild.Name) + + if childIndex == -1 { + merged.Children = append(merged.Children, updatedChild) + sort.Slice(merged.Children, func(i, j int) bool { + return merged.Children[i].Name < merged.Children[j].Name + }) + } else { + _, err := mergeFileTrees(merged.Children[childIndex], updatedChild) + if err != nil { + return nil, err + } + } + } + + return merged, nil +} + +func (n *fileTreeNode) deleteNode(node *fileTreeNode) error { + childIndex := n.findChild(node.Name) + if childIndex != -1 { + n.Children = append(n.Children[:childIndex], n.Children[childIndex+1:]...) + } + + return nil +} diff --git a/internal/docker/tree_test.go b/internal/docker/tree_test.go new file mode 100644 index 0000000..44ec014 --- /dev/null +++ b/internal/docker/tree_test.go @@ -0,0 +1,128 @@ +package docker + +import ( + "reflect" + "testing" +) + +func Test_fileTreeNode_String(t *testing.T) { + fileNode := fileTreeNode{"file", false, nil} + otherFileNode := fileTreeNode{"other_file", false, nil} + etcNode := fileTreeNode{"etc", true, []*fileTreeNode{&fileNode}} + + type fields struct { + Name string + IsDir bool + Children []*fileTreeNode + } + tests := []struct { + name string + fields fields + want string + }{ + { + name: "get string of only root node", + fields: fields{"/", true, nil}, + want: "/\n", + }, + { + name: "get string of /etc/file", + fields: fields{"/", true, []*fileTreeNode{&etcNode}}, + want: "/\n└── etc/\n └── file\n", + }, + { + name: "get string of /etc/file + /other_file", + fields: fields{"/", true, []*fileTreeNode{&etcNode, &otherFileNode}}, + want: "/\n├── etc/\n│ └── file\n└── other_file\n", + }, + } + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + n := &fileTreeNode{ + Name: tt.fields.Name, + IsDir: tt.fields.IsDir, + Children: tt.fields.Children, + } + if got := n.String(); got != tt.want { + t.Errorf("String() = %v, want %v", got, tt.want) + } + }) + } +} + +func Test_mergeFileTrees(t *testing.T) { + singleFileTree := &fileTreeNode{"file", false, nil} + + etcWithFile := &fileTreeNode{"etc", true, []*fileTreeNode{singleFileTree}} + rootWithEtcTreeNode := &fileTreeNode{"/", true, []*fileTreeNode{etcWithFile}} + + varWithFile := &fileTreeNode{"var", true, []*fileTreeNode{singleFileTree}} + rootWithVarTreeNode := &fileTreeNode{"/", true, []*fileTreeNode{varWithFile}} + + deleteSingleFileTree := &fileTreeNode{".wh.file", false, nil} + etcWithDeleteFile := &fileTreeNode{"etc", true, []*fileTreeNode{deleteSingleFileTree}} + rootWithEtcWithDeleteFileTreeNode := &fileTreeNode{"/", true, []*fileTreeNode{etcWithDeleteFile}} + + rootWithEtcWithDeleteFileAndAddVarFileTreeNode := &fileTreeNode{"/", true, []*fileTreeNode{etcWithDeleteFile, varWithFile}} + + type args struct { + original *fileTreeNode + updated *fileTreeNode + } + tests := []struct { + name string + args args + want *fileTreeNode + wantErr bool + }{ + { + name: "original is nil", + args: args{ + original: nil, + updated: singleFileTree, + }, + want: singleFileTree, + wantErr: false, + }, + { + name: "add /var/file to /etc/file", + args: args{ + original: rootWithEtcTreeNode, + updated: rootWithVarTreeNode, + }, + want: &fileTreeNode{"/", true, []*fileTreeNode{etcWithFile, varWithFile}}, + wantErr: false, + }, + { + name: "delete /etc/file", + args: args{ + original: rootWithEtcTreeNode, + updated: rootWithEtcWithDeleteFileTreeNode, + }, + want: &fileTreeNode{"/", true, []*fileTreeNode{{"etc", true, []*fileTreeNode{}}}}, + wantErr: false, + }, + { + name: "delete /etc/file and add /var/file", + args: args{ + original: rootWithEtcTreeNode, + updated: rootWithEtcWithDeleteFileAndAddVarFileTreeNode, + }, + want: &fileTreeNode{"/", true, []*fileTreeNode{{"etc", true, []*fileTreeNode{}}, varWithFile}}, + wantErr: false, + }, + } + + for _, tt := range tests { + t.Run(tt.name, func(t *testing.T) { + got, err := mergeFileTrees(tt.args.original, tt.args.updated) + if (err != nil) != tt.wantErr { + t.Errorf("mergeFileTrees() error = %v, wantErr %v", err, tt.wantErr) + return + } + if !reflect.DeepEqual(got, tt.want) { + t.Errorf("mergeFileTrees() got:\n%v, want:\n%v", got, tt.want) + } + }) + } +}