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btrfs hack: shrink the allocated size #2076

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btrfs hack: shrink the allocated size #2076

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2 changes: 2 additions & 0 deletions build_library/build_image_util.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -806,6 +806,8 @@ EOF
sudo fstrim "${root_fs_dir}/usr" || true
fi

"${BUILD_LIBRARY_DIR}/disk_util" --disk_layout="${disk_layout}" btrfsresetallocation \
"${root_fs_dir}/usr"
# Make the filesystem un-mountable as read-write and setup verity.
if [[ ${disable_read_write} -eq ${FLAGS_TRUE} ]]; then
# Unmount /usr partition
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23 changes: 23 additions & 0 deletions build_library/disk_util
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Original file line number Diff line number Diff line change
Expand Up @@ -768,6 +768,25 @@ def Tune(options):
if not action_done:
raise Exception("No options specified!")

def SudoOutputToConsole(cmd):
print(SudoOutput(cmd).decode())

def LogBtrfsUsage(mount_point, section=None):
print('Btrfs usage for mount point `%s` %s' % (mount_point, section))
try:
SudoOutputToConsole(['btrfs', 'fi', 'usage', mount_point])
except Exception as ex:
print('Btrfs usage could not be retrieved for mount point `%s` %s' % (mount_point, section))
print(ex)

def BtrfsResetAllocation(options):

LogBtrfsUsage(options.disk_image, 'before disk resize')
try:
Sudo(['btrfs', 'fi', 'resize', '-500m', options.disk_image])
except Exception as ex:
print(ex)
LogBtrfsUsage(options.disk_image, 'after disk resize')

def Verity(options):
"""Hash verity protected filesystems.
Expand Down Expand Up @@ -1119,6 +1138,10 @@ def main(argv):
a = actions.add_parser('parseonly', help='validate config')
a.set_defaults(func=DoParseOnly)

a = actions.add_parser('btrfsresetallocation', help='btrfs reset allocation')
a.add_argument('disk_image', help='path to disk image file')
a.set_defaults(func=BtrfsResetAllocation)

options = parser.parse_args(argv[1:])
options.func(options)

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