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Parse disk space using df -P -k.

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This commit is contained in:
Daniel Nichter
2011-12-19 10:22:42 -07:00
parent a172a3f2a7
commit bb315948cd
3 changed files with 38 additions and 27 deletions
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42
lib/bash/safeguards.sh
View File

@@ -25,19 +25,21 @@ set -u
disk_space() {
local filesystem=${1:-"$PWD"}
# Filesystem 1M-blocks Used Available Capacity Mounted on
# /dev/disk0s2 115383 92637 22496 81% /
df -m $filesystem
# Filesystem 1024-blocks Used Available Capacity Mounted on
# /dev/disk0s2 118153176 94409664 23487512 81% /
df -P -k $filesystem
}
# Sub: check_disk_space
# Check if there is or will be enough disk space.
# Check if there is or will be enough disk space. Input is a file
# with output from <disk_space()>, i.e. `df -P -k`. The df output
# must use 1k blocks, but the mb arg from the user is in MB.
#
# 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.
# file - File with output from <disk_space()>.
# mb - Minimum MB free.
# pc - Minimum percent free.
# mb_margin - Add this many MB to the real MB used.
#
# Returns:
# 0 if there is/will be enough disk space, else 1.
@@ -45,24 +47,28 @@ check_disk_space() {
local file=$1
local mb=${2:-"0"}
local pc=${3:-"0"}
local margin=${4:-"0"}
local mb_margin=${4:-"0"}
local mb_used=$(cat $file | awk '/^\//{print $3}');
local mb_free=$(cat $file | awk '/^\//{print $4}');
# Convert MB to KB because the df output should be in 1k blocks.
local kb=$(($mb * 1024))
local kb_margin=$(($mb_margin * 1024))
local kb_used=$(cat $file | awk '/^\//{print $3}');
local kb_free=$(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 + $mb_free))
if [ "$kb_margin" -gt "0" ]; then
local kb_total=$(($kb_used + $kb_free))
mb_used=$(($mb_used + $margin))
mb_free=$(($mb_free - $margin))
pc_used=$(awk "BEGIN { printf(\"%d\", $mb_used/$mb_total * 100) }")
kb_used=$(($kb_used + $kb_margin))
kb_free=$(($kb_free - $kb_margin))
pc_used=$(awk "BEGIN { printf(\"%d\", $kb_used/$kb_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 ${mb} MB free"
if [ "$kb_free" -le "$kb" -o "$pc_free" -le "$pc" ]; then
warn "Not enough free disk space: ${pc_free}% free, ${kb_free} KB free; wanted more than ${pc}% free or ${kb} KB free"
return 1
fi

19
t/lib/bash/safeguards.sh
View File

@@ -1,6 +1,6 @@
#!/usr/bin/env bash
TESTS=10
TESTS=11
source "$LIB_DIR/log_warn_die.sh"
source "$LIB_DIR/safeguards.sh"
@@ -13,30 +13,35 @@ cmd_ok \
"grep -q Avail $TMPDIR/df-out" \
"disk_space()"
check_disk_space "$SAMPLE/diskspace001.txt" 22495 18 >$TMPDIR/out 2>&1
is \
"`wc -l $TMPDIR/df-out | awk '{print $1}'`" \
"2" \
"2-line df output"
check_disk_space "$SAMPLE/diskspace001.txt" 22000 18 >$TMPDIR/out 2>&1
is "$?" "0" "Enough disk space"
is \
"`cat $TMPDIR/out`" \
"" \
"No output if enough disk space"
check_disk_space "$SAMPLE/diskspace001.txt" 22496 18 >$TMPDIR/out 2>&1
check_disk_space "$SAMPLE/diskspace001.txt" 24000 18 >$TMPDIR/out 2>&1
is "$?" "1" "Not enough MB free"
cmd_ok \
"grep -q '19% free, 22496 MB free; wanted more than 18% free or 22496 MB free' $TMPDIR/out" \
"grep -q '19% free, 23487512 KB free; wanted more than 18% free or 24576000 KB free' $TMPDIR/out" \
"Warning if not enough disk space"
check_disk_space "$SAMPLE/diskspace001.txt" 22495 19 >$TMPDIR/out 2>&1
check_disk_space "$SAMPLE/diskspace001.txt" 22000 19 >$TMPDIR/out 2>&1
is "$?" "1" "Not enough % free"
# ###########################################################################
# Check with a margin (amount we plan to use in the future).
# ###########################################################################
check_disk_space "$SAMPLE/diskspace001.txt" 22395 18 100
check_disk_space "$SAMPLE/diskspace001.txt" 22000 18 100
is "$?" "0" "Enough disk space with margin"
check_disk_space "$SAMPLE/diskspace001.txt" 22396 18 100 >$TMPDIR/out 2>&1
check_disk_space "$SAMPLE/diskspace001.txt" 23000 18 100 >$TMPDIR/out 2>&1
is "$?" "1" "Not enough MB free with margin"
check_disk_space "$SAMPLE/diskspace001.txt" 100 5 20000 >$TMPDIR/out 2>&1

4
t/lib/samples/bash/diskspace001.txt
View File

@@ -1,2 +1,2 @@
Filesystem 1M-blocks Used Available Capacity Mounted on
/dev/disk0s2 115383 92637 22496 81% /
Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/disk0s2 118153176 94409664 23487512 81% /