first draft of a script, that does massic argument checking

1 files changed, 90 insertions, 0 deletions

diff --git a/createAndExportDisk.py b/createAndExportDisk.py
new file mode 100755
index 0000000..52638ea
--- /dev/null
+++ b/createAndExportDisk.py
@@ -0,0 +1,90 @@
+#!/usr/bin/python3
+#coding: UTF-8
+import optparse
+import sys
+import re
+
+def logInfo(msg):
+    print("\033[1;32mINFO\033[0m " + str(msg))
+
+def logErr(msg):
+    print("\033[1;31mERROR\033[0m " + str(msg))
+
+# vars
+volumeGroupName = 'scsiRaid'
+defaultDiskSize = '3G'
+
+diskSize = ''
+diskSizeUnit='g'
+vmName = ''
+
+# configure known options
+parser = optparse.OptionParser()
+parser.add_option("-s", "--size", dest="size", default=defaultDiskSize,
+                    help="SIZE of vm root disk", metavar="SIZE")
+parser.add_option("-n", "--name", dest="name",
+                    help="name of the vm to create NAME", metavar="NAME")
+parser.add_option("-v", "--verbose", dest="verbose",
+                    action="store_true",  default=False,
+                    help="should I do output")
+(options, args) = parser.parse_args()
+
+def execute(command):
+    logInfo('Would execute: ' + str(command))
+
+def parseVmName(rawString):
+    # valdiate vm name
+    if not re.match('^vm-[a-z]+[0-9]?(-[a-z])?$',rawString):
+        logErr('The name ' + options.name + ' is no valid vm-name');
+        sys.exit(2)
+
+    return rawString
+
+def parseDiskSize(rawString):
+    # valdiate disk size
+    diskSizeUnit = 'G'
+    diskSize = 0
+
+    match = re.match('^([0-9]+)([GgMm])?$',rawString)
+
+    if not match:
+        logErr('The name ' + raw + ' is no a valid disk size <number>(G|M)?');
+        sys.exit(2)
+
+    try:
+        diskSizeUnit = match.group(2)
+        diskSize = int(match.group(1))
+    except ValueError:
+        logErr('The size ' + options.size + ' is not a valid disk size');
+        sys.exit(2)
+
+    if not diskSizeUnit:
+        diskSizeUnit = 'G'
+        logInfo("Interpreteing disk size in gigbyte magnitude")
+
+    if diskSizeUnit == 'm' or diskSizeUnit == 'M':
+        if not(1024 < diskSize and diskSize < 500000):
+            logErr(' Syrsly? ' + str(diskSize) + ' megabytes?')
+            sys.exit(2)
+    else:
+        if not(1 < diskSize and diskSize < 500):
+            logErr(' Syrsly? ' + str(diskSize) + ' gigabytes?')
+            sys.exit(2)
+    return (diskSize, diskSizeUnit)
+
+# check if required options are given
+if options.name == None:
+    logErr("A vm name (-n) schould be given")
+    sys.exit(2)
+
+vmName = parseVmName(options.name)
+diskSize, diskSizeUnit = parseDiskSize(options.size)
+
+execute(["lvcreate", "-n", vmName, "-L", str(diskSize) + str(diskSizeUnit)])
+execute(["mkfs", "/dev/" + volumeGroupName + "/" + vmName, "-l",vmName])
+execute(["addIscsiDisk", vmName])
+
+logInfo("All done. Proceed to {pang,peng} an install your vm there!")
+sys.exit(0)
+
+