diff --git a/src/blobs/props.ts b/src/blobs/props.ts
index 9a4420f..718092b 100644
--- a/src/blobs/props.ts
+++ b/src/blobs/props.ts
@@ -2,7 +2,7 @@ import { promises as fs } from 'fs'
 
 import { exists } from '../util/fs'
 import { parseLines } from '../util/parse'
-import { ALL_PARTITIONS } from '../util/partitions'
+import { ALL_SYS_PARTITIONS } from '../util/partitions'
 
 export type PartitionProps = Map<string, Map<string, string>>
 
@@ -30,7 +30,7 @@ export function parseProps(file: string) {
 export async function loadPartitionProps(sourceRoot: string) {
   let partProps = new Map<string, Map<string, string>>() as PartitionProps
 
-  for (let partition of ALL_PARTITIONS) {
+  for (let partition of ALL_SYS_PARTITIONS) {
     let propPath = `${sourceRoot}/${partition}/build.prop`
     if (partition == 'system' && !(await exists(propPath))) {
       // System-as-root
diff --git a/src/commands/collect-state.ts b/src/commands/collect-state.ts
index 613dba8..1e18c3a 100644
--- a/src/commands/collect-state.ts
+++ b/src/commands/collect-state.ts
@@ -8,7 +8,7 @@ import { loadPartVintfInfo } from '../blobs/vintf'
 import { serializeSystemState, SystemState } from '../config/system-state'
 import { parsePartContexts } from '../selinux/contexts'
 import { startActionSpinner, stopActionSpinner } from '../util/cli'
-import { ALL_PARTITIONS } from '../util/partitions'
+import { ALL_SYS_PARTITIONS } from '../util/partitions'
 
 export default class CollectState extends Command {
   static description = 'collect built system state for use with other commands'
@@ -32,7 +32,7 @@ export default class CollectState extends Command {
 
     // Files
     let spinner = startActionSpinner('Enumerating files')
-    for (let partition of ALL_PARTITIONS) {
+    for (let partition of ALL_SYS_PARTITIONS) {
       spinner.text = partition
 
       let files = await listPart(partition, customRoot)
diff --git a/src/commands/diff-files.ts b/src/commands/diff-files.ts
index b4a6cea..76e0fd8 100644
--- a/src/commands/diff-files.ts
+++ b/src/commands/diff-files.ts
@@ -2,7 +2,7 @@ import { Command, flags } from '@oclif/command'
 import chalk from 'chalk'
 
 import { diffLists, listPart } from '../blobs/file_list'
-import { ALL_PARTITIONS } from '../util/partitions'
+import { ALL_SYS_PARTITIONS } from '../util/partitions'
 
 export default class DiffFiles extends Command {
   static description = 'find missing system files compared to a reference system'
@@ -20,7 +20,7 @@ export default class DiffFiles extends Command {
   async run() {
     let {flags: {all}, args: {sourceRef, sourceNew}} = this.parse(DiffFiles)
 
-    for (let partition of ALL_PARTITIONS) {
+    for (let partition of ALL_SYS_PARTITIONS) {
       let filesRef = await listPart(partition, sourceRef)
       if (filesRef == null) {
         continue
diff --git a/src/commands/generate-all.ts b/src/commands/generate-all.ts
index 9c79504..ba7fb7b 100644
--- a/src/commands/generate-all.ts
+++ b/src/commands/generate-all.ts
@@ -20,7 +20,7 @@ import { diffPartContexts, parseContextsRecursive, parsePartContexts, resolvePar
 import { generateFileContexts } from '../selinux/labels'
 import { startActionSpinner, stopActionSpinner } from '../util/cli'
 import { withTempDir } from '../util/fs'
-import { ALL_PARTITIONS } from '../util/partitions'
+import { ALL_SYS_PARTITIONS } from '../util/partitions'
 
 export default class GenerateFull extends Command {
   static description = 'generate all vendor parts automatically'
@@ -57,7 +57,7 @@ export default class GenerateFull extends Command {
 
     // 1. Diff files
     let spinner = startActionSpinner('Enumerating files')
-    for (let partition of ALL_PARTITIONS) {
+    for (let partition of ALL_SYS_PARTITIONS) {
       let filesRef = await listPart(partition, stockRoot)
       if (filesRef == null) continue
       let filesNew = customState != null ? customState.partitionFiles[partition] :
diff --git a/src/commands/list-files.ts b/src/commands/list-files.ts
index 625d4fa..48a630c 100644
--- a/src/commands/list-files.ts
+++ b/src/commands/list-files.ts
@@ -2,7 +2,7 @@ import { Command, flags } from '@oclif/command'
 import { promises as fs } from 'fs'
 import { listPart } from '../blobs/file_list'
 
-import { ALL_PARTITIONS } from '../util/partitions'
+import { ALL_SYS_PARTITIONS } from '../util/partitions'
 
 export default class ListFiles extends Command {
   static description = 'list system files and symlinks important for blobs'
@@ -21,7 +21,7 @@ export default class ListFiles extends Command {
 
     await fs.mkdir(out, { recursive: true })
 
-    for (let partition of ALL_PARTITIONS) {
+    for (let partition of ALL_SYS_PARTITIONS) {
       let files = await listPart(partition, systemRoot, true)
       if (files == null) {
         continue
diff --git a/src/util/partitions.ts b/src/util/partitions.ts
index bf5b236..f432f9f 100644
--- a/src/util/partitions.ts
+++ b/src/util/partitions.ts
@@ -1,4 +1,30 @@
+export enum Partition {
+  // System
+  System = 'system',
+  SystemExt = 'system_ext',
+  Product = 'product',
+  Vendor = 'vendor',
+  VendorDlkm = 'vendor_dlkm',
+  Odm = 'odm',
+  OdmDlkm = 'odm_dlkm',
+
+  // Boot
+  Boot = 'boot',
+  Dt = 'dt',
+  Dtbo = 'dtbo',
+  PvmFw = 'pvmfw',
+  Recovery = 'recovery',
+  Vbmeta = 'vbmeta',
+  VbmetaSystem = 'vbmeta_system',
+  VbmetaVendor = 'vbmeta_vendor',
+  VendorBoot = 'vendor_boot',
+}
+
 // Android system partitions, excluding "system"
+export type ExtSysPartition = Partition.SystemExt |
+  Partition.Product |
+  Partition.Vendor |
+  Partition.Odm
 export const EXT_SYS_PARTITIONS = new Set([
   'system_ext',
   'product',
@@ -7,15 +33,19 @@ export const EXT_SYS_PARTITIONS = new Set([
 ])
 
 // GKI DLKM partitions
+export type DlkmPartition = Partition.VendorDlkm |
+  Partition.OdmDlkm
 export const DLKM_PARTITIONS = new Set([
   'vendor_dlkm',
   'odm_dlkm',
 ])
 
+export type ExtPartition = ExtSysPartition | DlkmPartition
 export const EXT_PARTITIONS = new Set([
   ...EXT_SYS_PARTITIONS,
   ...DLKM_PARTITIONS,
 ])
 
-// All partitions
-export const ALL_PARTITIONS = new Set(['system', ...EXT_PARTITIONS])
+// All system partitions
+export type SysPartition = Partition.System | ExtPartition
+export const ALL_SYS_PARTITIONS = new Set(['system', ...EXT_PARTITIONS])