X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/invirt-remote.git/blobdiff_plain/ccdd1009d00397d0f81fa9a95aa96faf448b9e94..813c4903ad9ead179d5f2aeaac8b7a551158a002:/host/usr/sbin/invirt-lvm

diff --git a/host/usr/sbin/invirt-lvm b/host/usr/sbin/invirt-lvm
index 6367216..cae6b2b 100755
--- a/host/usr/sbin/invirt-lvm
+++ b/host/usr/sbin/invirt-lvm
@@ -1,7 +1,10 @@
 #!/usr/bin/env python
 
 import sys
-import os.path
+import time
+import os
+import random
+import string
 from subprocess import call, PIPE, Popen
 from invirt.config import structs as config
 
@@ -19,6 +22,14 @@ def ensureoff(machine):
     rv = call(["/usr/sbin/xm", "destroy", prefix + machine],
               stderr=PIPE)
 
+machine_specific = subcommand not in ['lvcreate-all', 'vgcapacity']
+
+if machine_specific:
+    machine = sys.argv[2]
+    disk = sys.argv[3]
+    lvname = prefix + machine + "_" + disk
+    lvpath = "/dev/" + vg + "/" + lvname
+
 if subcommand == "lvcreate-all":
     from invirt import database
     import re
@@ -35,29 +46,29 @@ if subcommand == "lvcreate-all":
             if rv != 0:
                 print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
                 sys.exit(1)
-else:
-    machine = sys.argv[2]
-    disk = sys.argv[3]
-    lvname = prefix + machine + "_" + disk
-    lvpath = "/dev/" + vg + "/" + lvname
-if subcommand == "lvremove":
+elif subcommand == "lvremove":
     def error():
         print >>sys.stderr, "Error removing LV %s\n" % lvname
         sys.exit(1)
-    # I know this is the wrong answer, but sometimes the first
-    # lvchange -a n fails for no particularly good reason, so this is
-    # a pretty good workaround
-    call(["/sbin/lvchange", "-a", "n", lvpath])
-    rv = call(["/sbin/lvchange", "-a", "n", lvpath])
-    if rv != 0:
-        error()
-    rv = call(["/sbin/lvchange", "-a", "ey", lvpath])
-    if rv != 0:
-        error()
-    rv = call(["/sbin/lvremove", "--force", lvpath])
-    if rv != 0:
-        error()
+    
+    # Rename the LV to something else so we can wipe it before reusing
+    # the space
+    while True:
+        new_lvname = "old_%s_%s" % (lvname, ''.join(random.choice(string.ascii_letters) for i in xrange(6)))
+        new_lvpath = "/dev/%s/%s" % (vg, new_lvname)
+        p = Popen(["/sbin/lvrename", lvpath, new_lvpath], stdout=PIPE, stderr=PIPE)
+        rv = p.wait()
+        if rv == 5 and 'already exists in volume group' in p.stderr.read():
+            continue
+        elif rv != 0:
+            error()
+        else:
+            break
     ensureoff(machine)
+    
+    # Touch a file corresponding to the new name of the LV; a separate
+    # daemon will handle wiping and deleting it.
+    open(os.path.join('/var/lib/invirt-remote/cleanup', new_lvname), 'w')
 elif subcommand == "lvresize":
     size = sys.argv[4]
     ensureoff(machine)
@@ -85,5 +96,23 @@ elif subcommand == "lvcreate":
     if rv != 0:
         print >>sys.stderr, "Error creating LV %s\n" %(lvname,)
         sys.exit(1)
+elif subcommand == "vgcapacity":
+    p = Popen(["/sbin/vgs", "-o", "vg_extent_size,vg_extent_count,vg_free_count", 
+                            "--noheadings", "--units", "k", "--nosuffix", "--separator", ":", 
+                            vg],
+              stdout=PIPE, stderr=PIPE)
+    out,err = p.communicate()
     
+    try:
+        fields = out.strip().split(':')
+        extent_size = float(fields[0]) # in kibibytes
+        extent_count = int(fields[1])
+        free_count = int(fields[2])
+        total_space_TiB = extent_size * extent_count / 1024.**3
+        free_space_TiB = extent_size * free_count / 1024.**3
+        print >>sys.stdout, "Total: %.3f TiB" % (total_space_TiB,)
+        print >>sys.stdout, "Free: %.3f TiB" % (free_space_TiB,)
+    except:
+        print >>sys.stderr, "Error obtaining vg capacity:\n%s\n" % (err,)
+        sys.exit(1)