[libvirt] [PATCH 1/3] add qemu driver hook
this hook aimed at migration only, it supposed
to be used as a helper of migrate --copy-storage-*
features to remove the unreasonable limitation
of pre-exist disk images at migration target.
someone can add more functions to hook files.
Signed-off-by: liguang <lig.fnst(a)cn.fujitsu.com>
---
hooks/qemu | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
create mode 100755 hooks/qemu
diff --git a/hooks/qemu b/hooks/qemu
new file mode 100755
index 0000000..8b93668
--- /dev/null
+++ b/hooks/qemu
@@ -0,0 +1,55 @@
+#!/usr/bin/python -u
+
+import sys
+import string
+import os
+import subprocess
+from xml.etree import ElementTree as ET
+
+id, opstr, subopstr, extra = range(4)
+
+if __name__ == "__main__":
+ args = sys.argv[1:]
+ hook_log = "/var/log/libvirt/hooks.log"
+ redir_fp = open(hook_log, 'a')
+ sys.stdout = redir_fp
+ if args:
+ if args[opstr] == "migrate":
+ file_sz = "0xffffffff"
+ c = 0
+ dom_xml = sys.stdin.read()
+ ntree = ET.fromstring(dom_xml)
+ disks = ntree.findall('.//disk/source')
+ if disks == None:
+ sys.exit(1)
+ file_fmt = ntree.findall('.//disk/driver')
+ if file_fmt == None:
+ sys.exit(1)
+ for i in disks:
+ image = i.get('file')
+ if image == None:
+ print 'No disk images'
+ sys.exit(1)
+ if os.path.isfile(image):
+ continue
+ if os.path.isdir(os.path.dirname(image)) != True:
+ try:
+ os.makedirs(os.path.dirname(image))
+ except:
+ print 'Fail to create dir of disk images'
+ ff = file_fmt[c].get('type')
+ if ff == None:
+ ff = "raw"
+ try:
+ subprocess.Popen(['qemu-img', "create", "-f", ff, image,
file_sz],
+ stdout = redir_fp)
+ except:
+ print 'Fail to create disk images'
+ sys.exit(1)
+ c = c+1
+ print 'Created disk images for migration'
+ else:
+ print 'qemu <id> <ops> <subops> <extra>'
+
+ sys.stdout.close()
+
--
1.7.2.5