shell脚本处理长参数的模板

shell脚本处理长参数的模板

一个shell模板，处理命令行参数，支持长短参数:

#!/bin/bash
#
# FILE: kvm-clone-v2.sh
#
# DESCRIPTION: Clone a RHEL5.4/RHEL6 kvm guest on ubuntu14.04 host superv.
# This shell is used for cloning RHEL5.4 or RHEL6.x KVM guest.
# Note this shell is only tested for host OS Ubuntu14.04 and RHEL6.4.
#
# KVM is short for Kernel-based Virtual Machine and makes use of
# hardware virtualization. You need a CPU that supports hardware
# virtualization, e.g. Intel VT or AMD-V.
#
# NOTES: This requires GNU getopt.
# I do not issue any guarantee that this will work for you!
#
# COPYRIGHT: (c) 2015-2016 by the ZhangLiang
#
# LICENSE: Apache 2.0
#
# ORGANIZATION: PepStack (pepstack.com)
#
# CREATED: 2015-05-22 12:34:00
#
#=======================================================================
_file=$(readlink -f $0)
_dir=$(dirname $_file)
. $_dir/common.sh

# Treat unset variables as an error
set -o nounset

__ScriptVersion="2015.05.22"
__ScriptName="kvm-clone-v2.sh"

#-----------------------------------------------------------------------
# FUNCTION: usage
# DESCRIPTION: Display usage information.
#-----------------------------------------------------------------------
usage() {
cat << EOT

Usage : ${__ScriptName} CFGFILE [OPTION] ...
Create a virtual machine from given options.

Options:
-h, --help Display this message
-V, --version Display script version
-v, --verbose
-o, --origver=ORIGVER Origin vm name with version: rhel5_4 | rhel6_4
-D, --disksize=DISKSIZE Origin vm disk size: compact|medium|large
-p, --path-prefix=PATH Path prefix of vm
-m, --memsize=SIZEMB Memory size of vm by MB: 8192
-c, --vcpus=VCPUS Number of virtual cpu cores: 4
-n, --vmname=VMNAME Given name of vm
-H, --domain<DOMAIN> Optional hostname suffix of vm
-i, --ipv4=IPADDR Static ipv4 addr of vm if used
-S, --supervisor=SUPERVISOR Supervisor of vm: rhel6.4 or ubuntu14.04
-G, --gateway=GATEWAY Gateway ipv4 address
-T, --iftype=IFTYPE Network type: bridge or default
-B, --broadcast=BCAST Broadcast inet addr
-M, --netmask=MASK Net mask address, default: 255.255.255.0

Exit status:
0 if OK,
!=0 if serious problems.

Example:
1) Use short options to create vm:
$ sudo $__ScriptName ../conf/kvm-origin.cfg -o rhel6_4 -D compact -p el6 -m 2048 -c 2 -n vm-test2 -H pepstack.com -i 192.168.122.61 -S ubuntu14.04 -G 192.168.122.1 -B 192.168.122.255 -M 255.255.255.0

2) Use long options to create vm:
$ sudo $__ScriptName ../conf/kvm-origin.cfg --origver=rhel6_4 --disksize=compact --path-prefix=el6 --memsize=2048 --vcpus=2 --vmname=vm-test3 --domain=pepstack.com --ipv4=192.168.122.63 --supervisor=ubuntu14.04 --gateway=192.168.122.1 --broadcast=192.168.122.255 --netmask=255.255.255.0

Report bugs to 350137278@qq.com

EOT
} # ---------- end of function usage ----------

if [ $# -eq 0 ]; then usage; exit 1; fi

ABSDIR=$(real_path $(dirname $0))

CFGFILE=
VMNAME=
DOMAIN=
IPADDR=
PATHPREFIX=
GATEWAY=
BDCAST=
NETMASK="255.255.255.0"
VERBOSE=false
SIZEMB=8192
VCPUS=4
ORIGVER="rhel6_4"
DISKSIZE="compact"
VMORIG="$ORIGVER:$DISKSIZE"
SUPERVISOR="ubuntu14.04"

# parse options:
RET=`getopt -o hVvo:D:p:m:c:n:H::i:S:G:T:B:M: \
--long help,version,verbose,origver:,disksize:,path-prefix:,memsize:,\
vcpus:,vmname:,domain::,ipv4:,supervisor:,gateway:,\
iftype:,broadcast:,netmask:\
-n ' * ERROR' -- "$@"`

if [ $? != 0 ] ; then echoerror "$__ScriptName exited with doing nothing." >&2 ; exit 1 ; fi

# Note the quotes around $RET: they are essential!
eval set -- "$RET"

# set option values
while true; do
case "$1" in
-h | --help ) usage; exit 1;;
-v | --verbose ) VERBOSE=true; shift ;;
-V | --version ) echoinfo "$(basename $0) -- version $__ScriptVersion"; exit 1;;

-o | --origver ) ORIGVER=$2
echoinfo "origin: $ORIGVER"
shift 2 ;;

-D | --disksize ) DISKSIZE=$2
echoinfo "origin size: $DISKSIZE"
shift 2 ;;

-p | --path-prefix ) PATHPREFIX=$2
echoinfo "subdir: $PATHPREFIX"
shift 2 ;;

-n | --vmname) VMNAME=$2
echoinfo "new vm name: $VMNAME"
shift 2 ;;

-H | --domain)
# domain-suffix has an optional argument. as we are in quoted mode,
# an empty parameter will be generated if its optional argument is not found.
case "$2" in
"" ) echowarn "--domain, no argument"; shift 2 ;;
* ) DOMAIN="$2" ; echoinfo "domain: $DOMAIN"; shift 2 ;;
esac ;;

-i | --ipv4) IPADDR=$2
echoinfo "static ipv4: $IPADDR"
shift 2 ;;

-m | --memsize ) SIZEMB=$2
echoinfo "memory: $SIZEMB mb"
shift 2 ;;

-c | --vcpus ) VCPUS=$2
echoinfo "cpu cores: $VCPUS"
shift 2 ;;

-S | --supervisor ) SUPERVISOR=$2
echoinfo "supervisor: $SUPERVISOR"
shift 2;;

-G | --gateway ) GATEWAY=$2
echoinfo "gateway: $GATEWAY"
shift 2 ;;

-T | --iftype ) IFTYPE=$2
echoinfo "network type: $IFTYPE"
shift 2 ;;

-B | --broadcast ) BDCAST=$2
echoinfo "broad cast: $BDCAST"
shift 2 ;;

-M | --netmask) NETMASK=$2
echoinfo "netmask: $NETMASK"
shift 2 ;;

-- ) shift; break ;;
* ) echoerror "internal error!" ; exit 1 ;;
esac
done

# config file must provided with remaining argument
for arg do
CFGFILE=$(real_path $(dirname $arg))'/'$(basename $arg)
done

if [ -f $CFGFILE ]; then
echoinfo "Config file: $CFGFILE"
else
echoerror "Config file not found: $CFGFILE"
exit 3
fi

##################### THIS IS ONLY A TEMPLATE SHELL FILE #####################