Mirror/seaweedfs - seaweedfs - Gitea: Git with a cup of tea

Author	SHA1	Message	Date
Chris Lu	e6ee293c17	Add table operations test (#8241 ) * Add Trino blog operations test * Update test/s3tables/catalog_trino/trino_blog_operations_test.go Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * feat: add table bucket path helpers and filer operations - Add table object root and table location mapping directories - Implement ensureDirectory, upsertFile, deleteEntryIfExists helpers - Support table location bucket mapping for S3 access * feat: manage table bucket object roots on creation/deletion - Create .objects directory for table buckets on creation - Clean up table object bucket paths on deletion - Enable S3 operations on table bucket object roots * feat: add table location mapping for Iceberg REST - Track table location bucket mappings when tables are created/updated/deleted - Enable location-based routing for S3 operations on table data * feat: route S3 operations to table bucket object roots - Route table-s3 bucket names to mapped table paths - Route table buckets to object root directories - Support table location bucket mapping lookup * feat: emit table-s3 locations from Iceberg REST - Generate unique table-s3 bucket names with UUID suffix - Store table metadata under table bucket paths - Return table-s3 locations for Trino compatibility * fix: handle missing directories in S3 list operations - Propagate ErrNotFound from ListEntries for non-existent directories - Treat missing directories as empty results for list operations - Fixes Trino non-empty location checks on table creation * test: improve Trino CSV parsing for single-value results - Sanitize Trino output to skip jline warnings - Handle single-value CSV results without header rows - Strip quotes from numeric values in tests * refactor: use bucket path helpers throughout S3 API - Replace direct bucket path operations with helper functions - Leverage centralized table bucket routing logic - Improve maintainability with consistent path resolution * fix: add table bucket cache and improve filer error handling - Cache table bucket lookups to reduce filer overhead on repeated checks - Use filer_pb.CreateEntry and filer_pb.UpdateEntry helpers to check resp.Error - Fix delete order in handler_bucket_get_list_delete: delete table object before directory - Make location mapping errors best-effort: log and continue, don't fail API - Update table location mappings to delete stale prior bucket mappings on update - Add 1-second sleep before timestamp time travel query to ensure timestamps are in past - Fix CSV parsing: examine all lines, not skip first; handle single-value rows * fix: properly handle stale metadata location mapping cleanup - Capture oldMetadataLocation before mutation in handleUpdateTable - Update updateTableLocationMapping to accept both old and new locations - Use passed-in oldMetadataLocation to detect location changes - Delete stale mapping only when location actually changes - Pass empty string for oldLocation in handleCreateTable (new tables have no prior mapping) - Improve logging to show old -> new location transitions * refactor: cleanup imports and cache design - Remove unused 'sync' import from bucket_paths.go - Use filer_pb.UpdateEntry helper in setExtendedAttribute and deleteExtendedAttribute for consistent error handling - Add dedicated tableBucketCache map[string]bool to BucketRegistry instead of mixing concerns with metadataCache - Improve cache separation: table buckets cache is now separate from bucket metadata cache * fix: improve cache invalidation and add transient error handling Cache invalidation (critical fix): - Add tableLocationCache to BucketRegistry for location mapping lookups - Clear tableBucketCache and tableLocationCache in RemoveBucketMetadata - Prevents stale cache entries when buckets are deleted/recreated Transient error handling: - Only cache table bucket lookups when conclusive (found or ErrNotFound) - Skip caching on transient errors (network, permission, etc) - Prevents marking real table buckets as non-table due to transient failures Performance optimization: - Cache tableLocationDir results to avoid repeated filer RPCs on hot paths - tableLocationDir now checks cache before making expensive filer lookups - Cache stores empty string for 'not found' to avoid redundant lookups Code clarity: - Add comment to deleteDirectory explaining DeleteEntry response lacks Error field * go fmt * fix: mirror transient error handling in tableLocationDir and optimize bucketDir Transient error handling: - tableLocationDir now only caches definitive results - Mirrors isTableBucket behavior to prevent treating transient errors as permanent misses - Improves reliability on flaky systems or during recovery Performance optimization: - bucketDir avoids redundant isTableBucket call via bucketRoot - Directly use s3a.option.BucketsPath for regular buckets - Saves one cache lookup for every non-table bucket operation * fix: revert bucketDir optimization to preserve bucketRoot logic The optimization to directly use BucketsPath bypassed bucketRoot's logic and caused issues with S3 list operations on delimiter+prefix cases. Revert to using path.Join(s3a.bucketRoot(bucket), bucket) which properly handles all bucket types and ensures consistent path resolution across the codebase. The slight performance cost of an extra cache lookup is worth the correctness and consistency benefits. * feat: move table buckets under /buckets Add a table-bucket marker attribute, reuse bucket metadata cache for table bucket detection, and update list/validation/UI/test paths to treat table buckets as /buckets entries. * Fix S3 Tables code review issues - handler_bucket_create.go: Fix bucket existence check to properly validate entryResp.Entry before setting s3BucketExists flag (nil Entry should not indicate existing bucket) - bucket_paths.go: Add clarifying comment to bucketRoot() explaining unified buckets root path for all bucket types - file_browser_data.go: Optimize by extracting table bucket check early to avoid redundant WithFilerClient call * Fix list prefix delimiter handling * Handle list errors conservatively * Fix Trino FOR TIMESTAMP query - use past timestamp Iceberg requires the timestamp to be strictly in the past. Use current_timestamp - interval '1' second instead of current_timestamp. --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>	2 weeks ago
Chris Lu	8b61fd77b5	s3api: ensure MD5 is calculated or reused during CopyObject (#8163 ) * s3api: ensure MD5 is calculated or reused during CopyObject Fixes #8155 - Capture and reuse source MD5 for direct copies - Calculate MD5 for small inline objects during copy * s3api: refactor encryption logic and safe MD5 copying - Extract duplicated bucket default encryption logic into helper - Use safe append copy for MD5 slice to avoid shared modifications * refactor * avoids unnecessary MD5 recalculations for small files	3 weeks ago
Chris Lu	a72e269a2e	s3api: fix volume assignment failure in copy operations (#8128 ) Recent changes in the S3 unified copy strategy were constructing source and destination paths without the necessary BucketsPath prefix (typically /buckets). When these paths reached the Filer for volume assignment, it failed to resolve the correct collection and storage rules, defaulting to a disk type with no available capacity. This fix ensures all relevant paths in S3 copy handlers include the correct BucketsPath prefix for proper collection resolution. Fixes replication issue with Harbor upload via S3 API.	4 weeks ago
Chris Lu	733ca8e6df	Fix SSE-S3 copy: preserve encryption metadata and set chunk SSE type (#7598 ) * Fix SSE-S3 copy: preserve encryption metadata and set chunk SSE type Fixes GitHub #7562: Copying objects between encrypted buckets was failing. Root causes: 1. processMetadataBytes was re-adding SSE headers from source entry, undoing the encryption header filtering. Now uses dstEntry.Extended which is already filtered. 2. SSE-S3 streaming copy returned nil metadata. Now properly generates and returns SSE-S3 destination metadata (SeaweedFSSSES3Key, AES256 header) via ExecuteStreamingCopyWithMetadata. 3. Chunks created during streaming copy didn't have SseType set. Now sets SseType and per-chunk SseMetadata with chunk-specific IVs for SSE-S3, enabling proper decryption on GetObject. * Address review: make SSE-S3 metadata serialization failures fatal errors - In executeEncryptCopy: return error instead of just logging if SerializeSSES3Metadata fails - In createChunkFromData: return error if chunk SSE-S3 metadata serialization fails This ensures objects/chunks are never created without proper encryption metadata, preventing unreadable/corrupted data. * fmt * Refactor: reuse function names instead of creating WithMetadata variants - Change ExecuteStreamingCopy to return (EncryptionSpec, error) directly - Remove ExecuteStreamingCopyWithMetadata wrapper - Change executeStreamingReencryptCopy to return (EncryptionSpec, error) - Remove executeStreamingReencryptCopyWithMetadata wrapper - Update callers to ignore encryption spec with _ where not needed * Add TODO documenting large file SSE-S3 copy limitation The streaming copy approach encrypts the entire stream with a single IV but stores data in chunks with per-chunk IVs. This causes decryption issues for large files. Small inline files work correctly. This is a known architectural issue that needs separate work to fix. * Use chunk-by-chunk encryption for SSE-S3 copy (consistent with SSE-C/SSE-KMS) Instead of streaming encryption (which had IV mismatch issues for multi-chunk files), SSE-S3 now uses the same chunk-by-chunk approach as SSE-C and SSE-KMS: 1. Extended copyMultipartCrossEncryption to handle SSE-S3: - Added SSE-S3 source decryption in copyCrossEncryptionChunk - Added SSE-S3 destination encryption with per-chunk IVs - Added object-level metadata generation for SSE-S3 destinations 2. Updated routing in executeEncryptCopy/executeDecryptCopy/executeReencryptCopy to use copyMultipartCrossEncryption for all SSE-S3 scenarios 3. Removed streaming copy functions (shouldUseStreamingCopy, executeStreamingReencryptCopy) as they're no longer used 4. Added large file (1MB) integration test to verify chunk-by-chunk copy works This ensures consistent behavior across all SSE types and fixes data corruption that occurred with large files in the streaming copy approach. * fmt * fmt * Address review: fail explicitly if SSE-S3 metadata is missing Instead of silently ignoring missing SSE-S3 metadata (which could create unreadable objects), now explicitly fail the copy operation with a clear error message if: - First chunk is missing - First chunk doesn't have SSE-S3 type - First chunk has empty SSE metadata - Deserialization fails * Address review: improve comment to reflect full scope of chunk creation * Address review: fail explicitly if baseIV is empty for SSE-S3 chunk encryption If DestinationIV is not set when encrypting SSE-S3 chunks, the chunk would be created without SseMetadata, causing GetObject decryption to fail later. Now fails explicitly with a clear error message. Note: calculateIVWithOffset returns ([]byte, int) not ([]byte, error) - the int is a skip amount for intra-block alignment, not an error code. * Address review: handle 0-byte files in SSE-S3 copy For 0-byte files, there are no chunks to get metadata from. Generate an IV for the object-level metadata to ensure even empty files are properly marked as SSE-S3 encrypted. Also validate that we don't have a non-empty file with no chunks (which would indicate an internal error).	3 months ago
chrislu	99a9a67741	check errors	3 months ago
Chris Lu	b7b73016dd	S3 API: Add SSE-KMS (#7144 ) * implement sse-c * fix Content-Range * adding tests * Update s3_sse_c_test.go * copy sse-c objects * adding tests * refactor * multi reader * remove extra write header call * refactor * SSE-C encrypted objects do not support HTTP Range requests * robust * fix server starts * Update Makefile * Update Makefile * ci: remove SSE-C integration tests and workflows; delete test/s3/encryption/ * s3: SSE-C MD5 must be base64 (case-sensitive); fix validation, comparisons, metadata storage; update tests * minor * base64 * Update SSE-C_IMPLEMENTATION.md Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * Update weed/s3api/s3api_object_handlers.go Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * Update SSE-C_IMPLEMENTATION.md Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * address comments * fix test * fix compilation * Bucket Default Encryption To complete the SSE-KMS implementation for production use: Add AWS KMS Provider - Implement weed/kms/aws/aws_kms.go using AWS SDK Integrate with S3 Handlers - Update PUT/GET object handlers to use SSE-KMS Add Multipart Upload Support - Extend SSE-KMS to multipart uploads Configuration Integration - Add KMS configuration to filer.toml Documentation - Update SeaweedFS wiki with SSE-KMS usage examples * store bucket sse config in proto * add more tests * Update SSE-C_IMPLEMENTATION.md Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * Fix rebase errors and restore structured BucketMetadata API Merge Conflict Fixes: - Fixed merge conflicts in header.go (SSE-C and SSE-KMS headers) - Fixed merge conflicts in s3api_errors.go (SSE-C and SSE-KMS error codes) - Fixed merge conflicts in s3_sse_c.go (copy strategy constants) - Fixed merge conflicts in s3api_object_handlers_copy.go (copy strategy usage) API Restoration: - Restored BucketMetadata struct with Tags, CORS, and Encryption fields - Restored structured API functions: GetBucketMetadata, SetBucketMetadata, UpdateBucketMetadata - Restored helper functions: UpdateBucketTags, UpdateBucketCORS, UpdateBucketEncryption - Restored clear functions: ClearBucketTags, ClearBucketCORS, ClearBucketEncryption Handler Updates: - Updated GetBucketTaggingHandler to use GetBucketMetadata() directly - Updated PutBucketTaggingHandler to use UpdateBucketTags() - Updated DeleteBucketTaggingHandler to use ClearBucketTags() - Updated CORS handlers to use UpdateBucketCORS() and ClearBucketCORS() - Updated loadCORSFromBucketContent to use GetBucketMetadata() Internal Function Updates: - Updated getBucketMetadata() to return BucketMetadata struct - Updated setBucketMetadata() to accept BucketMetadata struct - Updated getBucketEncryptionMetadata() to use GetBucketMetadata() - Updated setBucketEncryptionMetadata() to use SetBucketMetadata() Benefits: - Resolved all rebase conflicts while preserving both SSE-C and SSE-KMS functionality - Maintained consistent structured API throughout the codebase - Eliminated intermediate wrapper functions for cleaner code - Proper error handling with better granularity - All tests passing and build successful The bucket metadata system now uses a unified, type-safe, structured API that supports tags, CORS, and encryption configuration consistently. * Fix updateEncryptionConfiguration for first-time bucket encryption setup - Change getBucketEncryptionMetadata to getBucketMetadata to avoid failures when no encryption config exists - Change setBucketEncryptionMetadata to setBucketMetadataWithEncryption for consistency - This fixes the critical issue where bucket encryption configuration failed for buckets without existing encryption Fixes: https://github.com/seaweedfs/seaweedfs/pull/7144#discussion_r2285669572 * Fix rebase conflicts and maintain structured BucketMetadata API Resolved Conflicts: - Fixed merge conflicts in s3api_bucket_config.go between structured API (HEAD) and old intermediate functions - Kept modern structured API approach: UpdateBucketCORS, ClearBucketCORS, UpdateBucketEncryption - Removed old intermediate functions: setBucketTags, deleteBucketTags, setBucketMetadataWithEncryption API Consistency Maintained: - updateCORSConfiguration: Uses UpdateBucketCORS() directly - removeCORSConfiguration: Uses ClearBucketCORS() directly - updateEncryptionConfiguration: Uses UpdateBucketEncryption() directly - All structured API functions preserved: GetBucketMetadata, SetBucketMetadata, UpdateBucketMetadata Benefits: - Maintains clean separation between API layers - Preserves atomic metadata updates with proper error handling - Eliminates function indirection for better performance - Consistent API usage pattern throughout codebase - All tests passing and build successful The bucket metadata system continues to use the unified, type-safe, structured API that properly handles tags, CORS, and encryption configuration without any intermediate wrapper functions. * Fix complex rebase conflicts and maintain clean structured BucketMetadata API Resolved Complex Conflicts: - Fixed merge conflicts between modern structured API (HEAD) and mixed approach - Removed duplicate function declarations that caused compilation errors - Consistently chose structured API approach over intermediate functions Fixed Functions: - BucketMetadata struct: Maintained clean field alignment - loadCORSFromBucketContent: Uses GetBucketMetadata() directly - updateCORSConfiguration: Uses UpdateBucketCORS() directly - removeCORSConfiguration: Uses ClearBucketCORS() directly - getBucketMetadata: Returns BucketMetadata struct consistently - setBucketMetadata: Accepts BucketMetadata struct consistently Removed Duplicates: - Eliminated duplicate GetBucketMetadata implementations - Eliminated duplicate SetBucketMetadata implementations - Eliminated duplicate UpdateBucketMetadata implementations - Eliminated duplicate helper functions (UpdateBucketTags, etc.) API Consistency Achieved: - Single, unified BucketMetadata struct for all operations - Atomic updates through UpdateBucketMetadata with function callbacks - Type-safe operations with proper error handling - No intermediate wrapper functions cluttering the API Benefits: - Clean, maintainable codebase with no function duplication - Consistent structured API usage throughout all bucket operations - Proper error handling and type safety - Build successful and all tests passing The bucket metadata system now has a completely clean, structured API without any conflicts, duplicates, or inconsistencies. * Update remaining functions to use new structured BucketMetadata APIs directly Updated functions to follow the pattern established in bucket config: - getEncryptionConfiguration() -> Uses GetBucketMetadata() directly - removeEncryptionConfiguration() -> Uses ClearBucketEncryption() directly Benefits: - Consistent API usage pattern across all bucket metadata operations - Simpler, more readable code that leverages the structured API - Eliminates calls to intermediate legacy functions - Better error handling and logging consistency - All tests pass with improved functionality This completes the transition to using the new structured BucketMetadata API throughout the entire bucket configuration and encryption subsystem. * Fix GitHub PR #7144 code review comments Address all code review comments from Gemini Code Assist bot: 1. High Priority - SSE-KMS Key Validation: Fixed ValidateSSEKMSKey to allow empty KMS key ID - Empty key ID now indicates use of default KMS key (consistent with AWS behavior) - Updated ParseSSEKMSHeaders to call validation after parsing - Enhanced isValidKMSKeyID to reject keys with spaces and invalid characters 2. Medium Priority - KMS Registry Error Handling: Improved error collection in CloseAll - Now collects all provider close errors instead of only returning the last one - Uses proper error formatting with %w verb for error wrapping - Returns single error for one failure, combined message for multiple failures 3. Medium Priority - Local KMS Aliases Consistency: Fixed alias handling in CreateKey - Now updates the aliases slice in-place to maintain consistency - Ensures both p.keys map and key.Aliases slice use the same prefixed format All changes maintain backward compatibility and improve error handling robustness. Tests updated and passing for all scenarios including edge cases. * Use errors.Join for KMS registry error handling Replace manual string building with the more idiomatic errors.Join function: - Removed manual error message concatenation with strings.Builder - Simplified error handling logic by using errors.Join(allErrors...) - Removed unnecessary string import - Added errors import for errors.Join This approach is cleaner, more idiomatic, and automatically handles: - Returning nil for empty error slice - Returning single error for one-element slice - Properly formatting multiple errors with newlines The errors.Join function was introduced in Go 1.20 and is the recommended way to combine multiple errors. * Update registry.go * Fix GitHub PR #7144 latest review comments Address all new code review comments from Gemini Code Assist bot: 1. High Priority - SSE-KMS Detection Logic: Tightened IsSSEKMSEncrypted function - Now relies only on the canonical x-amz-server-side-encryption header - Removed redundant check for x-amz-encrypted-data-key metadata - Prevents misinterpretation of objects with inconsistent metadata state - Updated test case to reflect correct behavior (encrypted data key only = false) 2. Medium Priority - UUID Validation: Enhanced KMS key ID validation - Replaced simplistic length/hyphen count check with proper regex validation - Added regexp import for robust UUID format checking - Regex pattern: ^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$ - Prevents invalid formats like '------------------------------------' from passing 3. Medium Priority - Alias Mutation Fix: Avoided input slice modification - Changed CreateKey to not mutate the input aliases slice in-place - Uses local variable for modified alias to prevent side effects - Maintains backward compatibility while being safer for callers All changes improve code robustness and follow AWS S3 standards more closely. Tests updated and passing for all scenarios including edge cases. * Fix failing SSE tests Address two failing test cases: 1. TestSSEHeaderConflicts: Fixed SSE-C and SSE-KMS mutual exclusion - Modified IsSSECRequest to return false if SSE-KMS headers are present - Modified IsSSEKMSRequest to return false if SSE-C headers are present - This prevents both detection functions from returning true simultaneously - Aligns with AWS S3 behavior where SSE-C and SSE-KMS are mutually exclusive 2. TestBucketEncryptionEdgeCases: Fixed XML namespace validation - Added namespace validation in encryptionConfigFromXMLBytes function - Now rejects XML with invalid namespaces (only allows empty or AWS standard namespace) - Validates XMLName.Space to ensure proper XML structure - Prevents acceptance of malformed XML with incorrect namespaces Both fixes improve compliance with AWS S3 standards and prevent invalid configurations from being accepted. All SSE and bucket encryption tests now pass successfully. * Fix GitHub PR #7144 latest review comments Address two new code review comments from Gemini Code Assist bot: 1. High Priority - Race Condition in UpdateBucketMetadata: Fixed thread safety issue - Added per-bucket locking mechanism to prevent race conditions - Introduced bucketMetadataLocks map with RWMutex for each bucket - Added getBucketMetadataLock helper with double-checked locking pattern - UpdateBucketMetadata now uses bucket-specific locks to serialize metadata updates - Prevents last-writer-wins scenarios when concurrent requests update different metadata parts 2. Medium Priority - KMS Key ARN Validation: Improved robustness of ARN validation - Enhanced isValidKMSKeyID function to strictly validate ARN structure - Changed from 'len(parts) >= 6' to 'len(parts) != 6' for exact part count - Added proper resource validation for key/ and alias/ prefixes - Prevents malformed ARNs with incorrect structure from being accepted - Now validates: arn:aws:kms:region:account:key/keyid or arn:aws:kms:region:account:alias/aliasname Both fixes improve system reliability and prevent edge cases that could cause data corruption or security issues. All existing tests continue to pass. * format * address comments * Configuration Adapter * Regex Optimization * Caching Integration * add negative cache for non-existent buckets * remove bucketMetadataLocks * address comments * address comments * copying objects with sse-kms * copying strategy * store IV in entry metadata * implement compression reader * extract json map as sse kms context * bucket key * comments * rotate sse chunks * KMS Data Keys use AES-GCM + nonce * add comments * Update weed/s3api/s3_sse_kms.go Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * Update s3api_object_handlers_put.go * get IV from response header * set sse headers * Update s3api_object_handlers.go * deterministic JSON marshaling * store iv in entry metadata * address comments * not used * store iv in destination metadata ensures that SSE-C copy operations with re-encryption (decrypt/re-encrypt scenario) now properly store the destination encryption metadata * add todo * address comments * SSE-S3 Deserialization * add BucketKMSCache to BucketConfig * fix test compilation * already not empty * use constants * fix: critical metadata (encrypted data keys, encryption context, etc.) was never stored during PUT/copy operations * address comments * fix tests * Fix SSE-KMS Copy Re-encryption * Cache now persists across requests * fix test * iv in metadata only * SSE-KMS copy operations should follow the same pattern as SSE-C * fix size overhead calculation * Filer-Side SSE Metadata Processing * SSE Integration Tests * fix tests * clean up * Update s3_sse_multipart_test.go * add s3 sse tests * unused * add logs * Update Makefile * Update Makefile * s3 health check * The tests were failing because they tried to run both SSE-C and SSE-KMS tests * Update weed/s3api/s3_sse_c.go Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> * Update Makefile * add back * Update Makefile * address comments * fix tests * Update s3-sse-tests.yml * Update s3-sse-tests.yml * fix sse-kms for PUT operation * IV * Update auth_credentials.go * fix multipart with kms * constants * multipart sse kms Modified handleSSEKMSResponse to detect multipart SSE-KMS objects Added createMultipartSSEKMSDecryptedReader to handle each chunk independently Each chunk now gets its own decrypted reader before combining into the final stream * validate key id * add SSEType * permissive kms key format * Update s3_sse_kms_test.go * format * assert equal * uploading SSE-KMS metadata per chunk * persist sse type and metadata * avoid re-chunk multipart uploads * decryption process to use stored PartOffset values * constants * sse-c multipart upload * Unified Multipart SSE Copy * purge * fix fatalf * avoid io.MultiReader which does not close underlying readers * unified cross-encryption * fix Single-object SSE-C * adjust constants * range read sse files * remove debug logs --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>	6 months ago