diff --git a/core/Makefile b/core/Makefile
index 63ec1a6..4b2a331 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2430,6 +2430,7 @@
 #
 # Note: it's intentional to skip signing for boot-debug.img, because it
 # can only be used if the device is unlocked with verification error.
+ifneq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifneq ($(INSTALLED_BOOTIMAGE_TARGET),)
 ifneq ($(strip $(TARGET_NO_KERNEL)),true)
 ifneq ($(strip $(BOARD_KERNEL_BINARIES)),)
@@ -2488,6 +2489,7 @@
 
 endif # TARGET_NO_KERNEL
 endif # INSTALLED_BOOTIMAGE_TARGET
+endif # BUILDING_VENDOR_BOOT_IMAGE is not true
 
 ifeq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifeq ($(BUILDING_RAMDISK_IMAGE),true)
@@ -2633,6 +2635,7 @@
 #
 # Note: it's intentional to skip signing for boot-test-harness.img, because it
 # can only be used if the device is unlocked with verification error.
+ifneq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
 ifneq ($(INSTALLED_BOOTIMAGE_TARGET),)
 ifneq ($(strip $(TARGET_NO_KERNEL)),true)
 
@@ -2675,6 +2678,7 @@
 
 endif # TARGET_NO_KERNEL
 endif # INSTALLED_BOOTIMAGE_TARGET
+endif # BUILDING_VENDOR_BOOT_IMAGE is not true
 endif # BOARD_BUILD_SYSTEM_ROOT_IMAGE is not true
 
 ifeq ($(BUILDING_VENDOR_BOOT_IMAGE),true)
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 0f95202..07797c8 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -131,3 +131,8 @@
 ifeq ($(TURBINE_ENABLED),false)
 $(eval $(call copy-one-file,$(LOCAL_FULL_CLASSES_JACOCO_JAR),$(full_classes_header_jar)))
 endif
+
+#######################################
+# Capture deps added after base_rules.mk
+include $(BUILD_NOTICE_FILE)
+#######################################
diff --git a/core/soong_app_prebuilt.mk b/core/soong_app_prebuilt.mk
index 82fb413..eeac9aa 100644
--- a/core/soong_app_prebuilt.mk
+++ b/core/soong_app_prebuilt.mk
@@ -254,3 +254,8 @@
 endif
 
 SOONG_ALREADY_CONV += $(LOCAL_MODULE)
+
+#######################################
+# Capture deps added after base_rules.mk
+include $(BUILD_NOTICE_FILE)
+#######################################
diff --git a/core/soong_config.mk b/core/soong_config.mk
index a39707e..9eb02b2 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -165,6 +165,7 @@
 $(call add_json_list, VendorSnapshotDirsExcluded,        $(VENDOR_SNAPSHOT_DIRS_EXCLUDED))
 $(call add_json_list, RecoverySnapshotDirsIncluded,      $(RECOVERY_SNAPSHOT_DIRS_INCLUDED))
 $(call add_json_list, RecoverySnapshotDirsExcluded,      $(RECOVERY_SNAPSHOT_DIRS_EXCLUDED))
+$(call add_json_bool, HostFakeSnapshotEnabled,           $(HOST_FAKE_SNAPSHOT_ENABLE))
 
 $(call add_json_bool, Treble_linker_namespaces,          $(filter true,$(PRODUCT_TREBLE_LINKER_NAMESPACES)))
 $(call add_json_bool, Enforce_vintf_manifest,            $(filter true,$(PRODUCT_ENFORCE_VINTF_MANIFEST)))
diff --git a/core/soong_java_prebuilt.mk b/core/soong_java_prebuilt.mk
index 1ebbf14..1b93be2 100644
--- a/core/soong_java_prebuilt.mk
+++ b/core/soong_java_prebuilt.mk
@@ -206,3 +206,8 @@
 		$(hide) touch $@)
 
 SOONG_ALREADY_CONV += $(LOCAL_MODULE)
+
+#######################################
+# Capture deps added after base_rules.mk
+include $(BUILD_NOTICE_FILE)
+#######################################
diff --git a/tools/check_elf_file.py b/tools/check_elf_file.py
index 1ff8e65..045cb1d 100755
--- a/tools/check_elf_file.py
+++ b/tools/check_elf_file.py
@@ -195,10 +195,12 @@
   @classmethod
   def _read_llvm_readobj(cls, elf_file_path, header, llvm_readobj):
     """Run llvm-readobj and parse the output."""
-    proc = subprocess.Popen(
-      [llvm_readobj, '-dynamic-table', '-dyn-symbols', elf_file_path],
-      stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    cmd = [llvm_readobj, '--dynamic-table', '--dyn-symbols', elf_file_path]
+    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     out, _ = proc.communicate()
+    rc = proc.returncode
+    if rc != 0:
+      raise subprocess.CalledProcessError(rc, cmd, out)
     lines = out.splitlines()
     return cls._parse_llvm_readobj(elf_file_path, header, lines)
 
diff --git a/tools/generate-notice-files.py b/tools/generate-notice-files.py
index bf958fb..5e3010f 100755
--- a/tools/generate-notice-files.py
+++ b/tools/generate-notice-files.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) 2012 The Android Open Source Project
 #
@@ -30,20 +30,18 @@
 import os
 import os.path
 import re
+import struct
 import sys
 
 MD5_BLOCKSIZE = 1024 * 1024
 HTML_ESCAPE_TABLE = {
-    "&": "&amp;",
-    '"': "&quot;",
-    "'": "&apos;",
-    ">": "&gt;",
-    "<": "&lt;",
+    b"&": b"&amp;",
+    b'"': b"&quot;",
+    b"'": b"&apos;",
+    b">": b"&gt;",
+    b"<": b"&lt;",
     }
 
-def hexify(s):
-    return ("%02x"*len(s)) % tuple(map(ord, s))
-
 def md5sum(filename):
     """Calculate an MD5 of the file given by FILENAME,
     and return hex digest as a string.
@@ -57,20 +55,26 @@
             break
         sum.update(block)
     f.close()
-    return hexify(sum.digest())
+    return sum.hexdigest()
 
 
 def html_escape(text):
     """Produce entities within text."""
-    return "".join(HTML_ESCAPE_TABLE.get(c,c) for c in text)
+    # Using for i in text doesn't work since i will be an int, not a byte.
+    # There are multiple ways to solve this, but the most performant way
+    # to iterate over a byte array is to use unpack. Using the
+    # for i in range(len(text)) and using that to get a byte using array
+    # slices is twice as slow as this method.
+    return b"".join(HTML_ESCAPE_TABLE.get(i,i) for i in struct.unpack(str(len(text)) + 'c', text))
 
-HTML_OUTPUT_CSS="""
+HTML_OUTPUT_CSS=b"""
 <style type="text/css">
 body { padding: 0; font-family: sans-serif; }
 .same-license { background-color: #eeeeee; border-top: 20px solid white; padding: 10px; }
 .label { font-weight: bold; }
 .file-list { margin-left: 1em; color: blue; }
 </style>
+
 """
 
 def combine_notice_files_html(file_hash, input_dirs, output_filename):
@@ -90,13 +94,13 @@
     # Open the output file, and output the header pieces
     output_file = open(output_filename, "wb")
 
-    print >> output_file, "<html><head>"
-    print >> output_file, HTML_OUTPUT_CSS
-    print >> output_file, '</head><body topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0">'
+    output_file.write(b"<html><head>\n")
+    output_file.write(HTML_OUTPUT_CSS)
+    output_file.write(b'</head><body topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0">\n')
 
     # Output our table of contents
-    print >> output_file, '<div class="toc">'
-    print >> output_file, "<ul>"
+    output_file.write(b'<div class="toc">\n')
+    output_file.write(b"<ul>\n")
 
     # Flatten the list of lists into a single list of filenames
     sorted_filenames = sorted(itertools.chain.from_iterable(file_hash))
@@ -104,31 +108,29 @@
     # Print out a nice table of contents
     for filename in sorted_filenames:
         stripped_filename = SRC_DIR_STRIP_RE.sub(r"\1", filename)
-        print >> output_file, '<li><a href="#id%d">%s</a></li>' % (id_table.get(filename), stripped_filename)
+        output_file.write(('<li><a href="#id%d">%s</a></li>\n' % (id_table.get(filename), stripped_filename)).encode())
 
-    print >> output_file, "</ul>"
-    print >> output_file, "</div><!-- table of contents -->"
+    output_file.write(b"</ul>\n")
+    output_file.write(b"</div><!-- table of contents -->\n")
     # Output the individual notice file lists
-    print >>output_file, '<table cellpadding="0" cellspacing="0" border="0">'
+    output_file.write(b'<table cellpadding="0" cellspacing="0" border="0">\n')
     for value in file_hash:
-        print >> output_file, '<tr id="id%d"><td class="same-license">' % id_table.get(value[0])
-        print >> output_file, '<div class="label">Notices for file(s):</div>'
-        print >> output_file, '<div class="file-list">'
+        output_file.write(b'<tr id="id%d"><td class="same-license">\n' % id_table.get(value[0]))
+        output_file.write(b'<div class="label">Notices for file(s):</div>\n')
+        output_file.write(b'<div class="file-list">\n')
         for filename in value:
-            print >> output_file, "%s <br/>" % (SRC_DIR_STRIP_RE.sub(r"\1", filename))
-        print >> output_file, "</div><!-- file-list -->"
-        print >> output_file
-        print >> output_file, '<pre class="license-text">'
-        print >> output_file, html_escape(open(value[0]).read())
-        print >> output_file, "</pre><!-- license-text -->"
-        print >> output_file, "</td></tr><!-- same-license -->"
-        print >> output_file
-        print >> output_file
-        print >> output_file
+            output_file.write(("%s <br/>\n" % SRC_DIR_STRIP_RE.sub(r"\1", filename)).encode())
+        output_file.write(b"</div><!-- file-list -->\n")
+        output_file.write(b"\n")
+        output_file.write(b'<pre class="license-text">\n')
+        with open(value[0], "rb") as notice_file:
+            output_file.write(html_escape(notice_file.read()))
+        output_file.write(b"\n</pre><!-- license-text -->\n")
+        output_file.write(b"</td></tr><!-- same-license -->\n\n\n\n")
 
     # Finish off the file output
-    print >> output_file, "</table>"
-    print >> output_file, "</body></html>"
+    output_file.write(b"</table>\n")
+    output_file.write(b"</body></html>\n")
     output_file.close()
 
 def combine_notice_files_text(file_hash, input_dirs, output_filename, file_title):
@@ -136,14 +138,18 @@
 
     SRC_DIR_STRIP_RE = re.compile("(?:" + "|".join(input_dirs) + ")(/.*).txt")
     output_file = open(output_filename, "wb")
-    print >> output_file, file_title
+    output_file.write(file_title.encode())
+    output_file.write(b"\n")
     for value in file_hash:
-      print >> output_file, "============================================================"
-      print >> output_file, "Notices for file(s):"
-      for filename in value:
-        print >> output_file, SRC_DIR_STRIP_RE.sub(r"\1", filename)
-      print >> output_file, "------------------------------------------------------------"
-      print >> output_file, open(value[0]).read()
+        output_file.write(b"============================================================\n")
+        output_file.write(b"Notices for file(s):\n")
+        for filename in value:
+            output_file.write(SRC_DIR_STRIP_RE.sub(r"\1", filename).encode())
+            output_file.write(b"\n")
+        output_file.write(b"------------------------------------------------------------\n")
+        with open(value[0], "rb") as notice_file:
+            output_file.write(notice_file.read())
+            output_file.write(b"\n")
     output_file.close()
 
 def combine_notice_files_xml(files_with_same_hash, input_dirs, output_filename):
@@ -154,15 +160,15 @@
     # Set up a filename to row id table (anchors inside tables don't work in
     # most browsers, but href's to table row ids do)
     id_table = {}
-    for file_key in files_with_same_hash.keys():
-        for filename in files_with_same_hash[file_key]:
+    for file_key, files in files_with_same_hash.items():
+        for filename in files:
              id_table[filename] = file_key
 
     # Open the output file, and output the header pieces
     output_file = open(output_filename, "wb")
 
-    print >> output_file, '<?xml version="1.0" encoding="utf-8"?>'
-    print >> output_file, "<licenses>"
+    output_file.write(b'<?xml version="1.0" encoding="utf-8"?>\n')
+    output_file.write(b"<licenses>\n")
 
     # Flatten the list of lists into a single list of filenames
     sorted_filenames = sorted(id_table.keys())
@@ -170,10 +176,8 @@
     # Print out a nice table of contents
     for filename in sorted_filenames:
         stripped_filename = SRC_DIR_STRIP_RE.sub(r"\1", filename)
-        print >> output_file, '<file-name contentId="%s">%s</file-name>' % (id_table.get(filename), stripped_filename)
-
-    print >> output_file
-    print >> output_file
+        output_file.write(('<file-name contentId="%s">%s</file-name>\n' % (id_table.get(filename), stripped_filename)).encode())
+    output_file.write(b"\n\n")
 
     processed_file_keys = []
     # Output the individual notice file lists
@@ -183,11 +187,13 @@
             continue
         processed_file_keys.append(file_key)
 
-        print >> output_file, '<file-content contentId="%s"><![CDATA[%s]]></file-content>' % (file_key, html_escape(open(filename).read()))
-        print >> output_file
+        output_file.write(('<file-content contentId="%s"><![CDATA[' % file_key).encode())
+        with open(filename, "rb") as notice_file:
+            output_file.write(html_escape(notice_file.read()))
+        output_file.write(b"]]></file-content>\n\n")
 
     # Finish off the file output
-    print >> output_file, "</licenses>"
+    output_file.write(b"</licenses>\n")
     output_file.close()
 
 def get_args():
@@ -254,7 +260,7 @@
                     file_md5sum = md5sum(filename)
                     files_with_same_hash[file_md5sum].append(filename)
 
-    filesets = [sorted(files_with_same_hash[md5]) for md5 in sorted(files_with_same_hash.keys())]
+    filesets = [sorted(files_with_same_hash[md5]) for md5 in sorted(list(files_with_same_hash))]
     combine_notice_files_text(filesets, input_dirs, txt_output_file, file_title)
 
     if html_output_file is not None:
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 189da37..1fe468e 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -451,18 +451,19 @@
   verity_image_builder = verity_utils.CreateVerityImageBuilder(prop_dict)
 
   disable_sparse = "disable_sparse" in prop_dict
-
+  mkfs_output = None
   if (prop_dict.get("use_dynamic_partition_size") == "true" and
       "partition_size" not in prop_dict):
     # If partition_size is not defined, use output of `du' + reserved_size.
     # For compressed file system, it's better to use the compressed size to avoid wasting space.
     if fs_type.startswith("erofs"):
-      tmp_dict = prop_dict.copy()
-      if "erofs_sparse_flag" in tmp_dict:
-        tmp_dict.pop("erofs_sparse_flag")
-      BuildImageMkfs(in_dir, tmp_dict, out_file, target_out, fs_config)
-      size = GetDiskUsage(out_file)
-      os.remove(out_file)
+      mkfs_output = BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config)
+      if "erofs_sparse_flag" in prop_dict and not disable_sparse:
+        image_path = UnsparseImage(out_file, replace=False)
+        size = GetDiskUsage(image_path)
+        os.remove(image_path)
+      else:
+        size = GetDiskUsage(out_file)
     else:
       size = GetDiskUsage(in_dir)
     logger.info(
@@ -550,7 +551,8 @@
     max_image_size = verity_image_builder.CalculateMaxImageSize()
     prop_dict["image_size"] = str(max_image_size)
 
-  mkfs_output = BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config)
+  if not mkfs_output:
+    mkfs_output = BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config)
 
   # Check if there's enough headroom space available for ext4 image.
   if "partition_headroom" in prop_dict and fs_type.startswith("ext4"):
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 40da34d..4eb2f0c 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -225,6 +225,8 @@
   --enable_vabc_xor
       Enable the VABC xor feature. Will reduce space requirements for OTA
 
+  --force_minor_version
+      Override the update_engine minor version for delta generation.
 """
 
 from __future__ import print_function
@@ -291,6 +293,7 @@
 OPTIONS.spl_downgrade = False
 OPTIONS.vabc_downgrade = False
 OPTIONS.enable_vabc_xor = True
+OPTIONS.force_minor_version = None
 
 POSTINSTALL_CONFIG = 'META/postinstall_config.txt'
 DYNAMIC_PARTITION_INFO = 'META/dynamic_partitions_info.txt'
@@ -1144,6 +1147,8 @@
     additional_args += ["--disable_vabc", "true"]
   if OPTIONS.enable_vabc_xor:
     additional_args += ["--enable_vabc_xor", "true"]
+  if OPTIONS.force_minor_version:
+    additional_args += ["--force_minor_version", OPTIONS.force_minor_version]
   additional_args += ["--max_timestamp", max_timestamp]
 
   if SupportsMainlineGkiUpdates(source_file):
@@ -1317,6 +1322,8 @@
       OPTIONS.vabc_downgrade = True
     elif o == "--enable_vabc_xor":
       OPTIONS.enable_vabc_xor = a.lower() != "false"
+    elif o == "--force_minor_version":
+      OPTIONS.force_minor_version = a
     else:
       return False
     return True
@@ -1362,6 +1369,7 @@
                                  "spl_downgrade",
                                  "vabc_downgrade",
                                  "enable_vabc_xor=",
+                                 "force_minor_version=",
                              ], extra_option_handler=option_handler)
 
   if len(args) != 2:
diff --git a/tools/zipalign/ZipFile.cpp b/tools/zipalign/ZipFile.cpp
index 1e3c413..6037d59 100644
--- a/tools/zipalign/ZipFile.cpp
+++ b/tools/zipalign/ZipFile.cpp
@@ -654,7 +654,7 @@
 {
     ZipEntry* pEntry = NULL;
     status_t result;
-    long lfhPosn, startPosn, endPosn, uncompressedLen;
+    long lfhPosn, uncompressedLen;
 
     if (mReadOnly)
         return INVALID_OPERATION;
@@ -690,7 +690,6 @@
      */
     lfhPosn = ftell(mZipFp);
     pEntry->mLFH.write(mZipFp);
-    startPosn = ftell(mZipFp);
 
     /*
      * Copy the data over.
@@ -741,18 +740,13 @@
     }
 
     /*
-     * Update file offsets.
-     */
-    endPosn = ftell(mZipFp);
-
-    /*
      * Success!  Fill out new values.
      */
     pEntry->setLFHOffset(lfhPosn);
     mEOCD.mNumEntries++;
     mEOCD.mTotalNumEntries++;
     mEOCD.mCentralDirSize = 0;      // mark invalid; set by flush()
-    mEOCD.mCentralDirOffset = endPosn;
+    mEOCD.mCentralDirOffset = ftell(mZipFp);
 
     /*
      * Go back and write the LFH.