Fix remaining diffs for init_boot and boot images

- Add missing $(cat ) around the fingerprint file
- Add partition size to init_boot
- Add avb keys and algorithms to boot partitions. I used to switch
  between the two modes in bootimg modules based on if a key was set,
  but now that we are setting a key here I added an explicit mode
  property.
- With all these, there are still diffs because avbtool.py introduces
  randomness for the salt. If you patch out the randomness locally
  the diffs come out clean.

Bug: 377562951
Bug: 377563630
Test: m soong_generated_boot_filesystem_test soong_generated_init_boot_filesystem_test
Change-Id: I448dfb431c240e8d06555fcc5d3e02660e8c2bfb
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index 6bfb097..d4301f9 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -546,42 +546,21 @@
 }
 
 func generateFsProps(ctx android.EarlyModuleContext, partitionType string) (*filesystem.FilesystemProperties, bool) {
-	fsGenState := ctx.Config().Get(fsGenStateOnceKey).(*FsGenState)
 	fsProps := &filesystem.FilesystemProperties{}
 
 	partitionVars := ctx.Config().ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse
-	var boardAvbEnable bool
-	var boardAvbKeyPath string
-	var boardAvbAlgorithm string
-	var boardAvbRollbackIndex string
+	var avbInfo avbInfo
 	var fsType string
 	if strings.Contains(partitionType, "ramdisk") {
 		fsType = "compressed_cpio"
 	} else {
 		specificPartitionVars := partitionVars.PartitionQualifiedVariables[partitionType]
 		fsType = specificPartitionVars.BoardFileSystemType
-		boardAvbEnable = partitionVars.BoardAvbEnable
-		boardAvbKeyPath = specificPartitionVars.BoardAvbKeyPath
-		boardAvbAlgorithm = specificPartitionVars.BoardAvbAlgorithm
-		boardAvbRollbackIndex = specificPartitionVars.BoardAvbRollbackIndex
-		if boardAvbEnable {
-			if boardAvbKeyPath == "" {
-				boardAvbKeyPath = partitionVars.BoardAvbKeyPath
-			}
-			if boardAvbAlgorithm == "" {
-				boardAvbAlgorithm = partitionVars.BoardAvbAlgorithm
-			}
-			if boardAvbRollbackIndex == "" {
-				boardAvbRollbackIndex = partitionVars.BoardAvbRollbackIndex
-			}
-		}
+		avbInfo = getAvbInfo(ctx.Config(), partitionType)
 		if fsType == "" {
 			fsType = "ext4" //default
 		}
 	}
-	if boardAvbKeyPath != "" {
-		boardAvbKeyPath = ":" + fsGenState.avbKeyFilegroups[boardAvbKeyPath]
-	}
 
 	fsProps.Type = proptools.StringPtr(fsType)
 	if filesystem.GetFsTypeFromString(ctx, *fsProps.Type).IsUnknown() {
@@ -594,15 +573,13 @@
 	fsProps.Unchecked_module = proptools.BoolPtr(true)
 
 	// BOARD_AVB_ENABLE
-	fsProps.Use_avb = proptools.BoolPtr(boardAvbEnable)
+	fsProps.Use_avb = avbInfo.avbEnable
 	// BOARD_AVB_KEY_PATH
-	fsProps.Avb_private_key = proptools.StringPtr(boardAvbKeyPath)
+	fsProps.Avb_private_key = avbInfo.avbkeyFilegroup
 	// BOARD_AVB_ALGORITHM
-	fsProps.Avb_algorithm = proptools.StringPtr(boardAvbAlgorithm)
+	fsProps.Avb_algorithm = avbInfo.avbAlgorithm
 	// BOARD_AVB_SYSTEM_ROLLBACK_INDEX
-	if rollbackIndex, err := strconv.ParseInt(boardAvbRollbackIndex, 10, 64); err == nil {
-		fsProps.Rollback_index = proptools.Int64Ptr(rollbackIndex)
-	}
+	fsProps.Rollback_index = avbInfo.avbRollbackIndex
 
 	fsProps.Partition_name = proptools.StringPtr(partitionType)
 
@@ -629,6 +606,55 @@
 	return fsProps, true
 }
 
+type avbInfo struct {
+	avbEnable        *bool
+	avbKeyPath       *string
+	avbkeyFilegroup  *string
+	avbAlgorithm     *string
+	avbRollbackIndex *int64
+	avbMode          *string
+}
+
+func getAvbInfo(config android.Config, partitionType string) avbInfo {
+	partitionVars := config.ProductVariables().PartitionVarsForSoongMigrationOnlyDoNotUse
+	specificPartitionVars := partitionVars.PartitionQualifiedVariables[partitionType]
+	var result avbInfo
+	boardAvbEnable := partitionVars.BoardAvbEnable
+	if boardAvbEnable {
+		result.avbEnable = proptools.BoolPtr(true)
+		if specificPartitionVars.BoardAvbKeyPath != "" {
+			result.avbKeyPath = proptools.StringPtr(specificPartitionVars.BoardAvbKeyPath)
+		} else if partitionVars.BoardAvbKeyPath != "" {
+			result.avbKeyPath = proptools.StringPtr(partitionVars.BoardAvbKeyPath)
+		}
+		if specificPartitionVars.BoardAvbAlgorithm != "" {
+			result.avbAlgorithm = proptools.StringPtr(specificPartitionVars.BoardAvbAlgorithm)
+		} else if partitionVars.BoardAvbAlgorithm != "" {
+			result.avbAlgorithm = proptools.StringPtr(partitionVars.BoardAvbAlgorithm)
+		}
+		if specificPartitionVars.BoardAvbRollbackIndex != "" {
+			parsed, err := strconv.ParseInt(specificPartitionVars.BoardAvbRollbackIndex, 10, 64)
+			if err != nil {
+				panic(fmt.Sprintf("Rollback index must be an int, got %s", specificPartitionVars.BoardAvbRollbackIndex))
+			}
+			result.avbRollbackIndex = &parsed
+		} else if partitionVars.BoardAvbRollbackIndex != "" {
+			parsed, err := strconv.ParseInt(partitionVars.BoardAvbRollbackIndex, 10, 64)
+			if err != nil {
+				panic(fmt.Sprintf("Rollback index must be an int, got %s", partitionVars.BoardAvbRollbackIndex))
+			}
+			result.avbRollbackIndex = &parsed
+		}
+		result.avbMode = proptools.StringPtr("make_legacy")
+	}
+	if result.avbKeyPath != nil {
+		fsGenState := config.Get(fsGenStateOnceKey).(*FsGenState)
+		filegroup := fsGenState.avbKeyFilegroups[*result.avbKeyPath]
+		result.avbkeyFilegroup = proptools.StringPtr(":" + filegroup)
+	}
+	return result
+}
+
 func (f *filesystemCreator) createFileListDiffTest(ctx android.ModuleContext, partitionType string) android.Path {
 	partitionModuleName := generatedModuleNameForPartition(ctx.Config(), partitionType)
 	systemImage := ctx.GetDirectDepWithTag(partitionModuleName, generatedFilesystemDepTag)