Move GetBootImageTimestamp to common.
Test: TH
Bug: 162623577
Change-Id: Icbd8b07dce91006a1abca1f0dc40726de8a10219
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index bae0b20..c4240c4 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -128,6 +128,9 @@
'odm_dlkm',
]
+# See sysprop.mk. If file is moved, add new search paths here; don't remove
+# existing search paths.
+RAMDISK_BUILD_PROP_REL_PATHS = ['system/etc/ramdisk/build.prop']
class ErrorCode(object):
"""Define error_codes for failures that happen during the actual
@@ -3569,3 +3572,55 @@
comment('Move partition %s from default to %s' %
(p, u.tgt_group))
append('move %s %s' % (p, u.tgt_group))
+
+
+def GetBootImageTimestamp(boot_img):
+ """
+ Get timestamp from ramdisk within the boot image
+
+ Args:
+ boot_img: the boot image file. Ramdisk must be compressed with lz4 format.
+
+ Return:
+ An integer that corresponds to the timestamp of the boot image, or None
+ if file has unknown format. Raise exception if an unexpected error has
+ occurred.
+ """
+
+ tmp_dir = MakeTempDir('boot_', suffix='.img')
+ try:
+ RunAndCheckOutput(['unpack_bootimg', '--boot_img', boot_img, '--out', tmp_dir])
+ ramdisk = os.path.join(tmp_dir, 'ramdisk')
+ if not os.path.isfile(ramdisk):
+ logger.warning('Unable to get boot image timestamp: no ramdisk in boot')
+ return None
+ uncompressed_ramdisk = os.path.join(tmp_dir, 'uncompressed_ramdisk')
+ RunAndCheckOutput(['lz4', '-d', ramdisk, uncompressed_ramdisk])
+
+ abs_uncompressed_ramdisk = os.path.abspath(uncompressed_ramdisk)
+ extracted_ramdisk = MakeTempDir('extracted_ramdisk')
+ # Use "toybox cpio" instead of "cpio" because the latter invokes cpio from
+ # the host environment.
+ RunAndCheckOutput(['toybox', 'cpio', '-F', abs_uncompressed_ramdisk, '-i'],
+ cwd=extracted_ramdisk)
+
+ prop_file = None
+ for search_path in RAMDISK_BUILD_PROP_REL_PATHS:
+ prop_file = os.path.join(extracted_ramdisk, search_path)
+ if os.path.isfile(prop_file):
+ break
+ logger.warning('Unable to get boot image timestamp: no %s in ramdisk', search_path)
+
+ if not prop_file:
+ return None
+
+ props = PartitionBuildProps.FromBuildPropFile('boot', prop_file)
+ timestamp = props.GetProp('ro.bootimage.build.date.utc')
+ if timestamp:
+ return int(timestamp)
+ logger.warning('Unable to get boot image timestamp: ro.bootimage.build.date.utc is undefined')
+ return None
+
+ except ExternalError as e:
+ logger.warning('Unable to get boot image timestamp: %s', e)
+ return None