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Fix and test safeguards.sh. Implement disk space+margin check.

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This commit is contained in:
Daniel Nichter
2011-12-14 16:12:43 -07:00
parent 90fbfaf41f
commit 92c8635c4a
3 changed files with 85 additions and 10 deletions
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43
lib/bash/safeguards.sh
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@@ -25,27 +25,50 @@ set -u
disk_space() {
local filesystem=${1:-"$PWD"}
# Filesystem 512-blocks Used Available Capacity Mounted on
# /dev/disk0s2 236306352 190223184 45571168 81% /
df -m -P $filesystem
# Filesystem 1M-blocks Used Available Capacity Mounted on
# /dev/disk0s2 115383 92637 22496 81% /
df -m $filesystem
}
# Sub: check_disk_space
# Check if there is or will be enough disk space.
#
# Arguments:
# file - File with output from <disk_space()>.
# mb - Minimum MB free.
# pc - Minimum percent free.
# margin - Add this many MB to the real MB used.
#
# Returns:
# 0 if there is/will be enough disk space, else 1.
check_disk_space() {
local file=$1
local mb=${2:-"0"}
local pct=${3:-"0"}
local pc=${3:-"0"}
local margin=${4:-"0"}
local avail=$(cat $file | awk '/^\//{print $4}');
local full=$(cat $file | awk '/^\//{print $5}' | sed -e 's/%//g');
if [ "${avail}" -le "$mb" -o "$full" -le "$pct" ]; then
echo "Not enough free space (${full}% full, ${avail}MB free)"
echo "Wanted less than ${pct}% full and more than ${mb}MB"
local mb_used=$(cat $file | awk '/^\//{print $3}');
local mb_free=$(cat $file | awk '/^\//{print $4}');
local pc_used=$(cat $file | awk '/^\//{print $5}' | sed -e 's/%//g');
if [ "$margin" -gt "0" ]; then
local mb_total=$(($mb_used + $mb_free))
mb_used=$(($mb_used + $margin))
mb_free=$(($mb_free - $margin))
pc_used=$(awk "BEGIN { printf(\"%d\", $mb_used/$mb_total * 100) }")
fi
local pc_free=$((100 - $pc_used))
if [ "$mb_free" -le "$mb" -o "$pc_free" -le "$pc" ]; then
warn "Not enough free disk space: ${pc_free}% free, ${mb_free} MB free; wanted more than ${pc}% free or ${mb} MB free"
return 1
fi
return 0
}
# ###########################################################################
# End safeguards package
# ###########################################################################