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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() { disk_space() {
local filesystem=${1:-"$PWD"} local filesystem=${1:-"$PWD"}
# Filesystem 1M-blocks Used Available Capacity Mounted on # Filesystem 1024-blocks Used Available Capacity Mounted on
# /dev/disk0s2 115383 92637 22496 81% / # /dev/disk0s2 118153176 94409664 23487512 81% /
df -m $filesystem df -P -k $filesystem
} }
# Sub: check_disk_space # 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: # Arguments:
# file - File with output from <disk_space()>. # file - File with output from <disk_space()>.
# mb - Minimum MB free. # mb - Minimum MB free.
# pc - Minimum percent free. # pc - Minimum percent free.
# margin - Add this many MB to the real MB used. # mb_margin - Add this many MB to the real MB used.
# #
# Returns: # Returns:
# 0 if there is/will be enough disk space, else 1. # 0 if there is/will be enough disk space, else 1.
@@ -45,24 +47,28 @@ check_disk_space() {
local file=$1 local file=$1
local mb=${2:-"0"} local mb=${2:-"0"}
local pc=${3:-"0"} local pc=${3:-"0"}
local margin=${4:-"0"} local mb_margin=${4:-"0"}
local mb_used=$(cat $file | awk '/^\//{print $3}'); # Convert MB to KB because the df output should be in 1k blocks.
local mb_free=$(cat $file | awk '/^\//{print $4}'); local kb=$(($mb * 1024))
local kb_margin=$(($mb_margin * 1024))
local kb_used=$(cat $file | awk '/^\//{print $3}');
local kb_free=$(cat $file | awk '/^\//{print $4}');
local pc_used=$(cat $file | awk '/^\//{print $5}' | sed -e 's/%//g'); local pc_used=$(cat $file | awk '/^\//{print $5}' | sed -e 's/%//g');
if [ "$margin" -gt "0" ]; then if [ "$kb_margin" -gt "0" ]; then
local mb_total=$(($mb_used + $mb_free)) local kb_total=$(($kb_used + $kb_free))
mb_used=$(($mb_used + $margin)) kb_used=$(($kb_used + $kb_margin))
mb_free=$(($mb_free - $margin)) kb_free=$(($kb_free - $kb_margin))
pc_used=$(awk "BEGIN { printf(\"%d\", $mb_used/$mb_total * 100) }") pc_used=$(awk "BEGIN { printf(\"%d\", $kb_used/$kb_total * 100) }")
fi fi
local pc_free=$((100 - $pc_used)) local pc_free=$((100 - $pc_used))
if [ "$mb_free" -le "$mb" -o "$pc_free" -le "$pc" ]; then if [ "$kb_free" -le "$kb" -o "$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" warn "Not enough free disk space: ${pc_free}% free, ${kb_free} KB free; wanted more than ${pc}% free or ${kb} KB free"
return 1 return 1
fi fi

19
t/lib/bash/safeguards.sh
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@@ -1,6 +1,6 @@
#!/usr/bin/env bash #!/usr/bin/env bash
TESTS=10 TESTS=11
source "$LIB_DIR/log_warn_die.sh" source "$LIB_DIR/log_warn_die.sh"
source "$LIB_DIR/safeguards.sh" source "$LIB_DIR/safeguards.sh"
@@ -13,30 +13,35 @@ cmd_ok \
"grep -q Avail $TMPDIR/df-out" \ "grep -q Avail $TMPDIR/df-out" \
"disk_space()" "disk_space()"
check_disk_space "$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 "$?" "0" "Enough disk space"
is \ is \
"`cat $TMPDIR/out`" \ "`cat $TMPDIR/out`" \
"" \ "" \
"No output if enough disk space" "No output if enough disk space"
check_disk_space "$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" is "$?" "1" "Not enough MB free"
cmd_ok \ 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' $TMPDIR/out" \
"Warning if not enough disk space" "Warning if not enough disk space"
check_disk_space "$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" is "$?" "1" "Not enough % free"
# ########################################################################### # ###########################################################################
# Check with a margin (amount we plan to use in the future). # Check with a margin (amount we plan to use in the future).
# ########################################################################### # ###########################################################################
check_disk_space "$SAMPLE/diskspace001.txt" 22395 18 100 check_disk_space "$SAMPLE/diskspace001.txt" 22000 18 100
is "$?" "0" "Enough disk space with margin" 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" is "$?" "1" "Not enough MB free with margin"
check_disk_space "$SAMPLE/diskspace001.txt" 100 5 20000 >$TMPDIR/out 2>&1 check_disk_space "$SAMPLE/diskspace001.txt" 100 5 20000 >$TMPDIR/out 2>&1

4
t/lib/samples/bash/diskspace001.txt
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@@ -1,2 +1,2 @@
Filesystem 1M-blocks Used Available Capacity Mounted on Filesystem 1024-blocks Used Available Capacity Mounted on
/dev/disk0s2 115383 92637 22496 81% / /dev/disk0s2 118153176 94409664 23487512 81% /