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purge_EBS_Snapshots now more portable - works with both OS X/BSD Date and GNU/Linux Date command.

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This commit is contained in:
Colin Johnson 2012-11-09 07:26:38 +00:00
parent e76a6743b4
commit c02743304a
1 changed files with 42 additions and 20 deletions
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62
ec2-automate-backup/ec2-automate-backup.sh
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@ -68,24 +68,46 @@ create_EBS_Snapshot_Tags()
fi
}
date_command_get()
date_binary_get()
{
#finds full path to date binary
date_binary_full_path=`which date`
#command below is used to determine if date binary is gnu, macosx or other
date_binary_file_result=`file -b $date_binary_full_path`
case $date_binary_file_result in
"Mach-O 64-bit executable x86_64") date_binary="macosx" ;;
"ELF 64-bit LSB executable, x86-64, version 1 (SYSV)"*) date_binary="gnu" ;;
#`uname -o (operating system) would be ideal, but OS X / Darwin does not support to -o option`
#`uname` on OS X defaults to `uname -s` and `uname` on GNU/Linux defaults to `uname -s`
uname_result=`uname`
case $uname_result in
Darwin) date_binary="osx-posix" ;;
Linux) date_binary="linux-gnu" ;;
*) date_binary="unknown" ;;
esac
#based on the installed date binary the case statement below will determine the method to use to determine "purge_after_days" in the future
case $date_binary in
gnu) date_command="date -d +${purge_after_days}days -u +%Y-%m-%d" ;;
macosx) date_command="date -v+${purge_after_days}d -u +%Y-%m-%d" ;;
unknown) date_command="date -d +${purge_after_days}days -u +%Y-%m-%d" ;;
*) date_command="date -d +${purge_after_days}days -u +%Y-%m-%d" ;;
esac
}
get_purge_after_date()
{
#based on the date_binary variable, the case statement below will determine the method to use to determine "purge_after_days" in the future
case $date_binary in
linux-gnu) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
osx-posix) echo `date -v+${purge_after_days}d -u +%Y-%m-%d` ;;
*) echo `date -d +${purge_after_days}days -u +%Y-%m-%d` ;;
esac
}
get_purge_after_date_epoch()
{
#based on the date_binary variable, the case statement below will determine the method to use to determine "purge_after_date_epoch" in the future
case $date_binary in
linux-gnu) echo `date -d $purge_after_date +%s` ;;
osx-posix) echo `date -j -f "%Y-%m-%d" $purge_after_date "+%s"` ;;
*) echo `date -d $purge_after_date +%s` ;;
esac
}
get_date_current_epoch()
{
#based on the date_binary variable, the case statement below will determine the method to use to determine "date_current_epoch" in the future
case $date_binary in
linux-gnu) echo `date -d $date_current +%s` ;;
osx-posix) echo `date -j -f "%Y-%m-%d" $date_current "+%s"` ;;
*) echo `date -d $date_current +%s` ;;
esac
}
purge_EBS_Snapshots()
@ -105,8 +127,8 @@ purge_EBS_Snapshots()
then echo "A Snapshot with the Snapshot ID $snapshot_id_evaluated has the tag \"PurgeAllow=true\" but does not have a \"PurgeAfter=YYYY-MM-DD\" date. $app_name is unable to determine if $snapshot_id_evaluated should be purged." 1>&2
else
#convert both the date_current and purge_after_date into epoch time to allow for comparison
date_current_epoch=`date -j -f "%Y-%m-%d" "$date_current" "+%s"`
purge_after_date_epoch=`date -j -f "%Y-%m-%d" "$purge_after_date" "+%s"`
date_current_epoch=`get_date_current_epoch`
purge_after_date_epoch=`get_purge_after_date_epoch`
#perform compparison - if $purge_after_date_epoch is a lower number than $date_current_epoch than the PurgeAfter date is earlier than the current date - and the snapshot can be safely removed
if [[ $purge_after_date_epoch < $date_current_epoch ]]
then
@ -152,11 +174,11 @@ date_current=`date -u +%Y-%m-%d`
#sets the PurgeAfter tag to the number of days that a snapshot should be retained
if [[ -n $purge_after_days ]]
then
#if the date_binary is not set, call the date_command_get function
#if the date_binary is not set, call the date_binary_get function
if [[ -z $date_binary ]]
then date_command_get
then date_binary_get
fi
purge_after_date=`$date_command`
purge_after_date=`get_purge_after_date`
echo "Snapshots taken by $app_name will be eligible for purging after the following date: $purge_after_date."
fi