feat(packages): clean up old Maven snapshot builds

Add configurable retention and dry-run settings for Maven snapshot artifacts.
Parse snapshot metadata and remove obsolete build files during package cleanup.

Assisted-by: GitHub Copilot: unspecified

Author: dianaStr7

custom/conf/app.example.ini

@@ -2817,6 +2817,10 @@ LEVEL = Info
 ;LIMIT_SIZE_HELM = -1
 ;; Maximum size of a Maven upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 ;LIMIT_SIZE_MAVEN = -1
+;; Number of recent Maven snapshot builds to retain. Set to `-1` to disable cleanup; `1` retains only the latest build.
+;RETAIN_MAVEN_SNAPSHOT_BUILDS = -1
+;; Run Maven snapshot cleanup without deleting files and log the files that would be deleted.
+;DEBUG_MAVEN_CLEANUP = true
 ;; Maximum size of a npm upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 ;LIMIT_SIZE_NPM = -1
 ;; Maximum size of a NuGet upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)

models/packages/package_file.go

@@ -5,6 +5,9 @@ package packages
 
 import (
 	"context"
+	"errors"
+	"fmt"
+	"sort"
 	"strconv"
 	"strings"
 	"time"
@@ -21,6 +24,8 @@ func init() {
 }
 
 var (
+	// ErrMetadataFile indicates a metadata file
+	ErrMetadataFile = errors.New("metadata file")
 	// ErrDuplicatePackageFile indicates a duplicated package file error
 	ErrDuplicatePackageFile = util.NewAlreadyExistErrorf("package file already exists")
 	// ErrPackageFileNotExist indicates a package file not exist error
@@ -245,6 +250,80 @@ func HasFiles(ctx context.Context, opts *PackageFileSearchOptions) (bool, error)
 	return db.Exist[PackageFile](ctx, opts.toConds())
 }
 
+// GetFilesBelowBuildNumber retrieves all files for a Maven snapshot version where the build number is <= maxBuildNumber.
+// Returns two slices: one for filtered files and one for skipped files.
+func GetFilesBelowBuildNumber(ctx context.Context, versionID int64, maxBuildNumber int, classifiers ...string) ([]*PackageFile, []*PackageFile, error) {
+	if maxBuildNumber <= 0 {
+		return nil, nil, errors.New("maxBuildNumber must be a positive integer")
+	}
+
+	files, err := GetFilesByVersionID(ctx, versionID)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to retrieve files: %w", err)
+	}
+
+	// Sort classifiers by length (longest first) once per call
+	sort.SliceStable(classifiers, func(i, j int) bool {
+		return len(classifiers[i]) > len(classifiers[j])
+	})
+
+	var filteredFiles, skippedFiles []*PackageFile
+	for _, file := range files {
+		buildNumber, err := extractBuildNumberFromFileName(file.Name, classifiers...)
+		if err != nil {
+			if !errors.Is(err, ErrMetadataFile) {
+				skippedFiles = append(skippedFiles, file)
+			}
+			continue
+		}
+
+		if buildNumber <= maxBuildNumber {
+			filteredFiles = append(filteredFiles, file)
+		}
+	}
+
+	return filteredFiles, skippedFiles, nil
+}
+
+// extractBuildNumberFromFileName extracts the build number from a Maven snapshot file name.
+// Expected formats:
+//
+//	"artifact-1.0.0-20250311.083409-9.tgz" returns 9
+//	"artifact-to-test-2.0.0-20250311.083409-10-sources.tgz" returns 10
+func extractBuildNumberFromFileName(filename string, classifiers ...string) (int, error) {
+	if strings.Contains(filename, "maven-metadata.xml") {
+		return 0, ErrMetadataFile
+	}
+
+	dotIdx := strings.LastIndex(filename, ".")
+	if dotIdx == -1 {
+		return 0, fmt.Errorf("extract build number from filename: no file extension found in '%s'", filename)
+	}
+	base := filename[:dotIdx]
+
+	// Remove classifier suffix if present.
+	for _, classifier := range classifiers {
+		suffix := "-" + classifier
+		if strings.HasSuffix(base, suffix) {
+			base = base[:len(base)-len(suffix)]
+			break
+		}
+	}
+
+	// The build number should be the token after the last dash.
+	lastDash := strings.LastIndex(base, "-")
+	if lastDash == -1 {
+		return 0, fmt.Errorf("extract build number from filename: invalid file name format in '%s'", filename)
+	}
+	buildNumberStr := base[lastDash+1:]
+	buildNumber, err := strconv.Atoi(buildNumberStr)
+	if err != nil {
+		return 0, fmt.Errorf("extract build number from filename: failed to convert build number '%s' to integer in '%s': %v", buildNumberStr, filename, err)
+	}
+
+	return buildNumber, nil
+}
+
 // CalculateFileSize sums up all blob sizes matching the search options.
 // It does NOT respect the deduplication of blobs.
 func CalculateFileSize(ctx context.Context, opts *PackageFileSearchOptions) (int64, error) {

modules/packages/maven/metadata.go

@@ -5,7 +5,9 @@ package maven
 
 import (
 	"encoding/xml"
+	"errors"
 	"io"
+	"strconv"
 
 	"gitea.dev/modules/util"
 	"gitea.dev/modules/validation"
@@ -31,6 +33,12 @@ type Dependency struct {
 	Version    string `json:"version,omitempty"`
 }
 
+// SnapshotMetadata struct holds the build number and the list of classifiers for a snapshot version
+type SnapshotMetadata struct {
+	BuildNumber int      `json:"build_number,omitempty"`
+	Classifiers []string `json:"classifiers,omitempty"`
+}
+
 type pomStruct struct {
 	XMLName xml.Name `xml:"project"`
 
@@ -61,6 +69,26 @@ type pomStruct struct {
 	} `xml:"dependencies>dependency"`
 }
 
+type snapshotMetadataStruct struct {
+	XMLName    xml.Name `xml:"metadata"`
+	GroupID    string   `xml:"groupId"`
+	ArtifactID string   `xml:"artifactId"`
+	Version    string   `xml:"version"`
+	Versioning struct {
+		LastUpdated string `xml:"lastUpdated"`
+		Snapshot    struct {
+			Timestamp   string `xml:"timestamp"`
+			BuildNumber string `xml:"buildNumber"`
+		} `xml:"snapshot"`
+		SnapshotVersions []struct {
+			Extension  string `xml:"extension"`
+			Classifier string `xml:"classifier"`
+			Value      string `xml:"value"`
+			Updated    string `xml:"updated"`
+		} `xml:"snapshotVersions>snapshotVersion"`
+	} `xml:"versioning"`
+}
+
 // ParsePackageMetaData parses the metadata of a pom file
 func ParsePackageMetaData(r io.Reader) (*Metadata, error) {
 	var pom pomStruct
@@ -109,3 +137,31 @@ func ParsePackageMetaData(r io.Reader) (*Metadata, error) {
 		Dependencies: dependencies,
 	}, nil
 }
+
+// ParseSnapshotVersionMetadata parses the Maven Snapshot Version metadata to extract the build number and list of available classifiers.
+func ParseSnapshotVersionMetadata(r io.Reader) (*SnapshotMetadata, error) {
+	var metadata snapshotMetadataStruct
+
+	dec := xml.NewDecoder(r)
+	dec.CharsetReader = charset.NewReaderLabel
+	if err := dec.Decode(&metadata); err != nil {
+		return nil, err
+	}
+
+	buildNumber, err := strconv.Atoi(metadata.Versioning.Snapshot.BuildNumber)
+	if err != nil {
+		return nil, errors.New("invalid or missing build number in snapshot metadata")
+	}
+
+	var classifiers []string
+	for _, snapshotVersion := range metadata.Versioning.SnapshotVersions {
+		if snapshotVersion.Classifier != "" {
+			classifiers = append(classifiers, snapshotVersion.Classifier)
+		}
+	}
+
+	return &SnapshotMetadata{
+		BuildNumber: buildNumber,
+		Classifiers: classifiers,
+	}, nil
+}

modules/setting/packages.go

@@ -42,10 +42,14 @@ var (
 		LimitSizeTerraformState int64
 		LimitSizeVagrant        int64
 
-		DefaultRPMSignEnabled bool
+		DefaultRPMSignEnabled     bool
+		RetainMavenSnapshotBuilds int
+		DebugMavenCleanup         bool
 	}{
-		Enabled:              true,
-		LimitTotalOwnerCount: -1,
+		Enabled:                   true,
+		LimitTotalOwnerCount:      -1,
+		RetainMavenSnapshotBuilds: -1,
+		DebugMavenCleanup:         true,
 	}
 )
 
@@ -90,6 +94,8 @@ func loadPackagesFrom(rootCfg ConfigProvider) (err error) {
 	Packages.LimitSizeTerraformState = mustBytes(sec, "LIMIT_SIZE_TERRAFORM_STATE")
 	Packages.LimitSizeVagrant = mustBytes(sec, "LIMIT_SIZE_VAGRANT")
 	Packages.DefaultRPMSignEnabled = sec.Key("DEFAULT_RPM_SIGN_ENABLED").MustBool(false)
+	Packages.RetainMavenSnapshotBuilds = sec.Key("RETAIN_MAVEN_SNAPSHOT_BUILDS").MustInt(Packages.RetainMavenSnapshotBuilds)
+	Packages.DebugMavenCleanup = sec.Key("DEBUG_MAVEN_CLEANUP").MustBool(Packages.DebugMavenCleanup)
 	return nil
 }
 

services/packages/cleanup/cleanup.go

@@ -20,6 +20,7 @@ import (
 	cargo_service "gitea.dev/services/packages/cargo"
 	container_service "gitea.dev/services/packages/container"
 	debian_service "gitea.dev/services/packages/debian"
+	maven_service "gitea.dev/services/packages/maven"
 	rpm_service "gitea.dev/services/packages/rpm"
 )
 
@@ -171,6 +172,10 @@ func CleanupExpiredData(ctx context.Context, olderThan time.Duration) error {
 			return err
 		}
 
+		if err := maven_service.CleanupSnapshotVersions(ctx); err != nil {
+			return fmt.Errorf("maven.CleanupSnapshotVersions failed: %w", err)
+		}
+
 		ps, err := packages_model.FindUnreferencedPackages(ctx)
 		if err != nil {
 			return err

services/packages/maven/cleanup.go

@@ -0,0 +1,157 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package maven
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"gitea.dev/models/packages"
+	"gitea.dev/modules/json"
+	"gitea.dev/modules/log"
+	"gitea.dev/modules/packages/maven"
+	"gitea.dev/modules/setting"
+	packages_service "gitea.dev/services/packages"
+)
+
+// CleanupSnapshotVersions removes outdated files for snapshot versions of all Maven packages.
+func CleanupSnapshotVersions(ctx context.Context) error {
+	retainBuilds := setting.Packages.RetainMavenSnapshotBuilds
+	debugSession := setting.Packages.DebugMavenCleanup
+	log.Debug("Maven Cleanup: starting with retainBuilds: %d, debugSession: %t", retainBuilds, debugSession)
+
+	if retainBuilds < 1 {
+		log.Warn("Maven Cleanup: skipped as value for retainBuilds less than 1: %d. Minimum 1 build should be retained", retainBuilds)
+		return nil
+	}
+
+	versions, err := packages.GetVersionsByPackageType(ctx, 0, packages.TypeMaven)
+	if err != nil {
+		return fmt.Errorf("maven cleanup: failed to retrieve Maven package versions: %w", err)
+	}
+
+	var errs []error
+	var metadataErrors []error
+
+	for _, version := range versions {
+		if !isSnapshotVersion(version.Version) {
+			continue
+		}
+
+		var artifactID, groupID string
+		if version.MetadataJSON != "" {
+			var metadata map[string]any
+			if err := json.Unmarshal([]byte(version.MetadataJSON), &metadata); err != nil {
+				log.Warn("Maven Cleanup: error during cleanup: failed to unmarshal metadataJSON for package version ID: %d: %v", version.ID, err)
+			} else {
+				artifactID, _ = metadata["artifact_id"].(string)
+				groupID, _ = metadata["group_id"].(string)
+				log.Debug("Maven Cleanup: processing package version with ID: %d, Group ID: %s, Artifact ID: %s, Version: %s", version.ID, groupID, artifactID, version.Version)
+			}
+		}
+
+		if err := cleanSnapshotFiles(ctx, version.ID, retainBuilds, debugSession); err != nil {
+			formattedErr := fmt.Errorf("version '%s' (ID: %d, Group ID: %s, Artifact ID: %s): %w",
+				version.Version, version.ID, groupID, artifactID, err)
+
+			if errors.Is(err, packages.ErrMetadataFile) {
+				metadataErrors = append(metadataErrors, formattedErr)
+			} else {
+				errs = append(errs, formattedErr)
+			}
+		}
+	}
+
+	for _, err := range metadataErrors {
+		log.Warn("Maven Cleanup: error during cleanup: %v", err)
+	}
+
+	if len(errs) > 0 {
+		for _, err := range errs {
+			log.Error("Maven Cleanup: error during cleanup: %v", err)
+		}
+		return fmt.Errorf("maven cleanup: completed with errors: %v", errs)
+	}
+
+	log.Debug("Maven Cleanup: completed")
+	return nil
+}
+
+func isSnapshotVersion(version string) bool {
+	return strings.HasSuffix(version, "-SNAPSHOT")
+}
+
+func cleanSnapshotFiles(ctx context.Context, versionID int64, retainBuilds int, debugSession bool) error {
+	log.Debug("Maven Cleanup: starting cleanSnapshotFiles for versionID: %d with retainBuilds: %d, debugSession: %t", versionID, retainBuilds, debugSession)
+
+	metadataFile, err := packages.GetFileForVersionByName(ctx, versionID, "maven-metadata.xml", packages.EmptyFileKey)
+	if err != nil {
+		return fmt.Errorf("%w: failed to retrieve maven-metadata.xml: %w", packages.ErrMetadataFile, err)
+	}
+
+	maxBuildNumber, classifiers, err := extractMaxBuildNumber(ctx, metadataFile)
+	if err != nil {
+		return fmt.Errorf("%w: failed to extract max build number from maven-metadata.xml: %w", packages.ErrMetadataFile, err)
+	}
+
+	thresholdBuildNumber := maxBuildNumber - retainBuilds
+	if thresholdBuildNumber <= 0 {
+		log.Debug("Maven Cleanup: no files to clean up, as the threshold build number is less than or equal to zero for versionID %d", versionID)
+		return nil
+	}
+
+	filesToRemove, skippedFiles, err := packages.GetFilesBelowBuildNumber(ctx, versionID, thresholdBuildNumber, classifiers...)
+	if err != nil {
+		return fmt.Errorf("cleanSnapshotFiles: failed to retrieve files for version: %w", err)
+	}
+
+	if debugSession {
+		var fileNamesToRemove, skippedFileNames []string
+
+		for _, file := range filesToRemove {
+			fileNamesToRemove = append(fileNamesToRemove, file.Name)
+		}
+
+		for _, file := range skippedFiles {
+			skippedFileNames = append(skippedFileNames, file.Name)
+		}
+
+		log.Debug("Maven Cleanup: debug session active. Files to remove: %v, Skipped files: %v", fileNamesToRemove, skippedFileNames)
+		return nil
+	}
+
+	for _, file := range filesToRemove {
+		log.Debug("Maven Cleanup: removing file '%s' below threshold %d", file.Name, thresholdBuildNumber)
+		if err := packages_service.DeletePackageFile(ctx, file); err != nil {
+			return fmt.Errorf("cleanSnapshotFiles: failed to delete file '%s': %w", file.Name, err)
+		}
+	}
+
+	return nil
+}
+
+func extractMaxBuildNumber(ctx context.Context, metadataFile *packages.PackageFile) (int, []string, error) {
+	pb, err := packages.GetBlobByID(ctx, metadataFile.BlobID)
+	if err != nil {
+		return 0, nil, fmt.Errorf("failed to get package blob: %w", err)
+	}
+
+	content, err := packages_service.OpenBlobStream(pb)
+	if err != nil {
+		return 0, nil, fmt.Errorf("failed to get package file stream: %w", err)
+	}
+	defer content.Close()
+
+	snapshotMetadata, err := maven.ParseSnapshotVersionMetadata(content)
+	if err != nil {
+		return 0, nil, fmt.Errorf("failed to parse maven-metadata.xml: %w", err)
+	}
+
+	buildNumber := snapshotMetadata.BuildNumber
+	classifiers := snapshotMetadata.Classifiers
+
+	return buildNumber, classifiers, nil
+}