79 lines
3.5 KiB
Bash
79 lines
3.5 KiB
Bash
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#!/bin/bash -
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# Author: Colin Johnson / colin@cloudavail.com
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# Date: 2012-09-07
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# Version 0.1
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# License Type: GNU GENERAL PUBLIC LICENSE, Version 3
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#
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#confirms that executables required for succesful script execution are available
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prerequisite_check()
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{
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for prerequisite in basename ec2-create-snapshot
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do
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#use of "hash" chosen as it is a shell builtin and will add programs to hash table, possibly speeding execution. Use of type also considered - open to suggestions.
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hash $prerequisite &> /dev/null
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if [[ $? == 1 ]] #has exits with exit status of 70, executable was not found
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then echo "In order to use `basename $0`, the executable \"$prerequisite\" must be installed." 1>&2 ; exit 70
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fi
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done
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}
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#get_EBS_List gets a list of available EBS instances depending upon the selection_method of EBS selection that is provided by user input
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get_EBS_list()
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{
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case $selection_method in
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volumeid)
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if [[ -z $volumeid ]]
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then echo "The selection method \"volumeid\" (which is $app_name's default selection_method of operation or requested by using the -s volumeid parameter) requires a volumeid (-v volumeid) for operation. Correct usage is as follows: \"-v vol-6d6a0527\",\"-s volumeid -v vol-6d6a0527\" or \"-v \"vol-6d6a0527 vol-636a0112\"\" if multiple volumes are to be selected." 1>&2 ; exit 64
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fi
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ebs_selection_string="$volumeid"
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;;
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tag)
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if [[ -z $tag ]]
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then echo "The selected selection_method \"tag\" (-s tag) requires a valid tag (-t key=value) for operation. Correct usage is as follows: \"-s tag -t backup=true\" or \"-s tag -t Name=my_ebs_volume.\"" 1>&2 ; exit 64
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fi
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ebs_selection_string="--filter tag:$tag"
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;;
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*) echo "If you specify a selection_method (-s selection_method) for selecting EBS volumes you must select either \"volumeid\" (-s volumeid) or \"tag\" (-s tag)." 1>&2 ; exit 64 ;;
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esac
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#creates a list of all ebs volumes that match the selection string from above
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ebs_backup_list_complete=`ec2-describe-volumes --show-empty-fields --region $region $ebs_selection_string 2>&1`
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#takes the output of the previous command
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ebs_backup_list_result=`echo $?`
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if [[ $ebs_backup_list_result -gt 0 ]]
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then echo -e "An error occured when running ec2-describe-volumes. The error thrown is below:\n$ebs_backup_list_complete" 1>&2 ; exit 64
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fi
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ebs_backup_list=`echo "$ebs_backup_list_complete" | grep ^VOLUME | cut -f 2`
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#code to right will output list of EBS volumes to be backed up: echo -e "Now outputting ebs_backup_list:\n$ebs_backup_list"
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}
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#calls prerequisitecheck function to ensure that all executables required for script execution are available
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prerequisite_check
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app_name=`basename $0`
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#sets defaults
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selection_method="volumeid"
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region="us-east-1"
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#sets date variable
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date_current=`date -u +%Y-%m-%d`
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#handles options processing
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while getopts :s:r:v:t: opt
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do
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case $opt in
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s) selection_method="$OPTARG";;
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r) region="$OPTARG";;
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v) volumeid="$OPTARG";;
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t) tag="$OPTARG";;
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*) echo "Error with Options Input. Cause of failure is most likely that an unsupported parameter was passed or a parameter was passed without a corresponding option." 1>&2 ; exit 64;;
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esac
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done
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#get_EBS_List gets a list of EBS instances for which a snapshot is desired. The list of EBS instances depends upon the selection_method that is provided by user input
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get_EBS_list
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#the loop below is called once for each volume in $ebs_backup_list - the currently selected EBS volume is passed in as "ebs_selected"
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for ebs_selected in $ebs_backup_list
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do
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echo "ec2-create-snapshot --region $region -d ${ebs_selected}_$date_current $ebs_selected"
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done
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