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fix(disk_util): Set btrfs default subvolume

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This avoids needing to always pass the subvol=root mount option.
This commit is contained in:
Michael Marineau 2014-05-16 18:49:45 -07:00
parent acb9800259
commit ee6b9ee1f9
1 changed files with 15 additions and 0 deletions
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15
build_library/disk_util
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@ -7,6 +7,7 @@ import argparse
import contextlib
import json
import os
import re
import subprocess
import sys
import tempfile
@ -320,6 +321,18 @@ def Sudo(cmd, stdout_null=False):
null.close()
def BtrfsSubvolId(path):
"""Get the subvolume id from a given path."""
out = subprocess.check_output(
['sudo', 'btrfs', 'subvolume', 'show', path])
m = re.search(r'^\s*Object ID:\s*(\d+)$', out, re.MULTILINE)
if not m:
raise Exception('Failed to parse btrfs output: %r', out)
return int(m.group(1))
def FormatBtrfs(part, device):
"""Format an ext2 or ext4 filesystem.
@ -342,6 +355,8 @@ def FormatBtrfs(part, device):
Sudo(['mount', '-t', 'btrfs', device, btrfs_mount])
try:
Sudo(['btrfs', 'subvolume', 'create', subvol_path])
subvol_id = BtrfsSubvolId(subvol_path)
Sudo(['btrfs', 'subvolume', 'set-default', subvol_id, btrfs_mount])
finally:
Sudo(['umount', btrfs_mount])
os.rmdir(btrfs_mount)