diff options
author | Lars Wirzenius <lars.wirzenius@codethink.co.uk> | 2013-02-07 11:27:52 +0000 |
---|---|---|
committer | Lars Wirzenius <lars.wirzenius@codethink.co.uk> | 2013-02-07 11:27:52 +0000 |
commit | 439623c9ffbd56fb1241265321e9a2dd8e1437f5 (patch) | |
tree | 37826eb7efb7f7eeb9512c6424815918720edd6d | |
parent | c7e6642d855283b85182097b24226e78aa78e199 (diff) | |
download | definitions-439623c9ffbd56fb1241265321e9a2dd8e1437f5.tar.gz |
Create hole in-process without executing dd(1)
Suggested-By: Richard Maw
-rwxr-xr-x | writeexts.py | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/writeexts.py b/writeexts.py index 23473021..676a9d22 100755 --- a/writeexts.py +++ b/writeexts.py @@ -70,13 +70,10 @@ class WriteExtension(cliapp.Application): '''Create a raw disk image.''' self.status(msg='Creating empty disk image') - cliapp.runcmd( - ['dd', - 'if=/dev/zero', - 'of=' + filename, - 'bs=1', - 'seek=%d' % size, - 'count=0']) + with open(filename, 'wb') as f: + if size > 0: + f.seek(size-1) + f.write('\0') def mkfs_btrfs(self, location): '''Create a btrfs filesystem on the disk.''' |