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feat: add support for copying certs to dockerd's registry directory #101
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package dockerutil | ||
|
|
||
| import ( | ||
| "context" | ||
| "io" | ||
| "path/filepath" | ||
|
|
||
| "github.com/spf13/afero" | ||
| "golang.org/x/xerrors" | ||
|
|
||
| "github.com/coder/envbox/xunix" | ||
| ) | ||
|
|
||
| // WriteCertsForRegistry writes the certificates found in the provided directory | ||
| // to the correct subdirectory that the Docker daemon uses when pulling images | ||
| // from the specified private registry. | ||
| func WriteCertsForRegistry(ctx context.Context, registryName, certsDir string) error { | ||
| fs := xunix.GetFS(ctx) | ||
|
|
||
| // Docker certs directory. | ||
| registryCertsDir := filepath.Join("/etc/docker/certs.d", registryName) | ||
|
|
||
| // If the directory already exists it means someone | ||
| // has either wrapped the image or has mounted in certs | ||
| // manually. We should assume the user knows what they're | ||
| // doing and avoid mucking with their solution. | ||
| if _, err := fs.Stat(registryCertsDir); err == nil { | ||
| return nil | ||
| } | ||
|
|
||
| // Ensure the registry certs directory exists. | ||
| err := fs.MkdirAll(registryCertsDir, 0o755) | ||
| if err != nil { | ||
| return xerrors.Errorf("create registry certs directory: %w", err) | ||
| } | ||
|
|
||
| // Check if certsDir is a file. | ||
| fileInfo, err := fs.Stat(certsDir) | ||
| if err != nil { | ||
| return xerrors.Errorf("stat certs directory/file: %w", err) | ||
| } | ||
|
|
||
| if !fileInfo.IsDir() { | ||
| // If it's a file, copy it directly | ||
| err = copyCertFile(fs, certsDir, filepath.Join(registryCertsDir, "ca.crt")) | ||
| if err != nil { | ||
| return xerrors.Errorf("copy cert file: %w", err) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // If it's a directory, copy all cert files in the root of the directory | ||
| entries, err := afero.ReadDir(fs, certsDir) | ||
| if err != nil { | ||
| return xerrors.Errorf("read certs directory: %w", err) | ||
| } | ||
|
|
||
| for _, entry := range entries { | ||
| if entry.IsDir() { | ||
| continue | ||
| } | ||
| srcPath := filepath.Join(certsDir, entry.Name()) | ||
| dstPath := filepath.Join(registryCertsDir, entry.Name()) | ||
| err = copyCertFile(fs, srcPath, dstPath) | ||
| if err != nil { | ||
| return xerrors.Errorf("copy cert file %s: %w", entry.Name(), err) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func copyCertFile(fs xunix.FS, src, dst string) error { | ||
| srcFile, err := fs.Open(src) | ||
| if err != nil { | ||
| return xerrors.Errorf("open source file: %w", err) | ||
| } | ||
| defer srcFile.Close() | ||
|
|
||
| dstFile, err := fs.Create(dst) | ||
| if err != nil { | ||
| return xerrors.Errorf("create destination file: %w", err) | ||
| } | ||
| defer dstFile.Close() | ||
|
|
||
| _, err = io.Copy(dstFile, srcFile) | ||
| if err != nil { | ||
| return xerrors.Errorf("copy file contents: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package dockerutil_test | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "path/filepath" | ||
| "testing" | ||
|
|
||
| "github.com/spf13/afero" | ||
| "github.com/stretchr/testify/assert" | ||
| "github.com/stretchr/testify/require" | ||
|
|
||
| "github.com/coder/envbox/dockerutil" | ||
| "github.com/coder/envbox/xunix" | ||
| "github.com/coder/envbox/xunix/xunixfake" | ||
| ) | ||
|
|
||
| func TestWriteCertsForRegistry(t *testing.T) { | ||
| t.Parallel() | ||
|
|
||
| t.Run("SingleCertFile", func(t *testing.T) { | ||
| t.Parallel() | ||
| // Test setup | ||
| fs := xunixfake.NewMemFS() | ||
| ctx := xunix.WithFS(context.Background(), fs) | ||
|
|
||
| // Create a test certificate file | ||
| certContent := []byte("test certificate content") | ||
| err := afero.WriteFile(fs, "/certs/ca.crt", certContent, 0o644) | ||
| require.NoError(t, err) | ||
|
|
||
| // Run the function | ||
| err = dockerutil.WriteCertsForRegistry(ctx, "test.registry.com", "/certs/ca.crt") | ||
| require.NoError(t, err) | ||
|
|
||
| // Check the result | ||
| copiedContent, err := afero.ReadFile(fs, "/etc/docker/certs.d/test.registry.com/ca.crt") | ||
| require.NoError(t, err) | ||
| assert.Equal(t, certContent, copiedContent) | ||
| }) | ||
|
|
||
| t.Run("MultipleCertFiles", func(t *testing.T) { | ||
| t.Parallel() | ||
| // Test setup | ||
| fs := xunixfake.NewMemFS() | ||
| ctx := xunix.WithFS(context.Background(), fs) | ||
|
|
||
| // Create test certificate files | ||
| certFiles := []string{"ca.crt", "client.cert", "client.key"} | ||
| for _, file := range certFiles { | ||
| err := afero.WriteFile(fs, filepath.Join("/certs", file), []byte("content of "+file), 0o644) | ||
| require.NoError(t, err) | ||
| } | ||
|
|
||
| // Run the function | ||
| err := dockerutil.WriteCertsForRegistry(ctx, "test.registry.com", "/certs") | ||
| require.NoError(t, err) | ||
|
|
||
| // Check the results | ||
| for _, file := range certFiles { | ||
| copiedContent, err := afero.ReadFile(fs, filepath.Join("/etc/docker/certs.d/test.registry.com", file)) | ||
| require.NoError(t, err) | ||
| assert.Equal(t, []byte("content of "+file), copiedContent) | ||
| } | ||
| }) | ||
| t.Run("ExistingRegistryCertsDir", func(t *testing.T) { | ||
| t.Parallel() | ||
| // Test setup | ||
| fs := xunixfake.NewMemFS() | ||
| ctx := xunix.WithFS(context.Background(), fs) | ||
|
|
||
| // Create an existing registry certs directory | ||
| registryCertsDir := "/etc/docker/certs.d/test.registry.com" | ||
| err := fs.MkdirAll(registryCertsDir, 0o755) | ||
| require.NoError(t, err) | ||
|
|
||
| // Create a file in the existing directory | ||
| existingContent := []byte("existing certificate content") | ||
| err = afero.WriteFile(fs, filepath.Join(registryCertsDir, "existing.crt"), existingContent, 0o644) | ||
| require.NoError(t, err) | ||
|
|
||
| // Create a test certificate file in the source directory | ||
| certContent := []byte("new certificate content") | ||
| err = afero.WriteFile(fs, "/certs/ca.crt", certContent, 0o644) | ||
| require.NoError(t, err) | ||
|
|
||
| // Run the function | ||
| err = dockerutil.WriteCertsForRegistry(ctx, "test.registry.com", "/certs") | ||
| require.NoError(t, err) | ||
|
|
||
| // Check that the existing file was not modified | ||
| existingFileContent, err := afero.ReadFile(fs, filepath.Join(registryCertsDir, "existing.crt")) | ||
| require.NoError(t, err) | ||
| assert.Equal(t, existingContent, existingFileContent) | ||
|
|
||
| // Check that the new file was not copied | ||
| _, err = fs.Stat(filepath.Join(registryCertsDir, "ca.crt")) | ||
| assert.True(t, os.IsNotExist(err), "New certificate file should not have been copied") | ||
| }) | ||
| } |
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