Skip shrinking if the image reached minimum size.
This commit is contained in:
Phuong Vu
parent
540cd52832
commit
a8643bac88
122
pishrink.sh
122
pishrink.sh
|
|
@ -31,11 +31,6 @@ function cleanup() {
|
|||
if losetup "$loopback" &>/dev/null; then
|
||||
losetup -d "$loopback"
|
||||
fi
|
||||
if [ "$debug" = true ]; then
|
||||
local old_owner=$(stat -c %u:%g "$src")
|
||||
chown "$old_owner" "$LOGFILE"
|
||||
fi
|
||||
|
||||
}
|
||||
|
||||
function logVariables() {
|
||||
|
|
@ -299,6 +294,7 @@ if (( $rc )); then
|
|||
info "Possibly invalid image. Run 'parted $img unit B print' manually to investigate"
|
||||
exit 8
|
||||
fi
|
||||
# Determine the last partition number and its starting block.
|
||||
partnum="$(echo "$parted_output" | tail -n 1 | cut -d ':' -f 1)"
|
||||
partstart="$(echo "$parted_output" | tail -n 1 | cut -d ':' -f 2 | tr -d 'B')"
|
||||
if [ -z "$(parted -s "$img" unit B print | grep "$partstart" | grep logical)" ]; then
|
||||
|
|
@ -306,6 +302,7 @@ if [ -z "$(parted -s "$img" unit B print | grep "$partstart" | grep logical)" ];
|
|||
else
|
||||
parttype="logical"
|
||||
fi
|
||||
# Now mount the last partition as a loopback device..
|
||||
loopback="$(losetup -f --show -o "$partstart" "$img")"
|
||||
# Wait 3 seconds to ensure loopback is ready.
|
||||
sleep 3
|
||||
|
|
@ -358,72 +355,72 @@ fi
|
|||
minsize=$(cut -d ':' -f 2 <<< "$minsize" | tr -d ' ')
|
||||
logVariables $LINENO currentsize minsize
|
||||
if [[ $currentsize -eq $minsize ]]; then
|
||||
error $LINENO "Image already shrunk to smallest size"
|
||||
exit 11
|
||||
fi
|
||||
|
||||
#Add some free space to the end of the filesystem
|
||||
targetsize=$(($minsize + $extraspace * 1024**2 / $blocksize))
|
||||
if [ $targetsize -ge $currentsize ]; then
|
||||
info "Target size ($targetsize) too large, force to current size minus 1"
|
||||
let minsize=$currentsize-1
|
||||
info "Image already shrunk to smallest size"
|
||||
else
|
||||
minsize=$targetsize
|
||||
fi
|
||||
logVariables $LINENO targetsize currentsize minsize
|
||||
#Add some free space to the end of the filesystem
|
||||
targetsize=$(($minsize + $extraspace * 1024**2 / $blocksize))
|
||||
if [ $targetsize -ge $currentsize ]; then
|
||||
info "Target size ($targetsize) too large, force to current size minus 1"
|
||||
let minsize=$currentsize-1
|
||||
else
|
||||
minsize=$targetsize
|
||||
fi
|
||||
logVariables $LINENO targetsize currentsize minsize
|
||||
|
||||
#Shrink filesystem
|
||||
info "Shrinking filesystem"
|
||||
resize2fs -p "$loopback" $minsize
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "resize2fs failed with rc $rc"
|
||||
mount "$loopback" "$mountdir"
|
||||
mv "$mountdir/etc/rc.local.bak" "$mountdir/etc/rc.local"
|
||||
umount "$mountdir"
|
||||
losetup -d "$loopback"
|
||||
exit 12
|
||||
fi
|
||||
sleep 1
|
||||
#Shrink filesystem
|
||||
info "Shrinking filesystem"
|
||||
resize2fs -p "$loopback" $minsize
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "resize2fs failed with rc $rc"
|
||||
mount "$loopback" "$mountdir"
|
||||
mv "$mountdir/etc/rc.local.bak" "$mountdir/etc/rc.local"
|
||||
umount "$mountdir"
|
||||
losetup -d "$loopback"
|
||||
exit 12
|
||||
fi
|
||||
sleep 1
|
||||
|
||||
#Shrink partition
|
||||
partnewsize=$(($minsize * $blocksize))
|
||||
newpartend=$(($partstart + $partnewsize))
|
||||
logVariables $LINENO partnewsize newpartend
|
||||
parted -s -a minimal "$img" rm "$partnum"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 13
|
||||
fi
|
||||
#Shrink partition
|
||||
partnewsize=$(($minsize * $blocksize))
|
||||
newpartend=$(($partstart + $partnewsize))
|
||||
logVariables $LINENO partnewsize newpartend
|
||||
parted -s -a minimal "$img" rm "$partnum"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 13
|
||||
fi
|
||||
|
||||
parted -s "$img" unit B mkpart "$parttype" "$partstart" "$newpartend"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 14
|
||||
fi
|
||||
parted -s "$img" unit B mkpart "$parttype" "$partstart" "$newpartend"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 14
|
||||
fi
|
||||
|
||||
#Truncate the file
|
||||
info "Shrinking image"
|
||||
endresult=$(parted -ms "$img" unit B print free)
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 15
|
||||
fi
|
||||
#Truncate the file
|
||||
info "Shrinking image"
|
||||
endresult=$(parted -ms "$img" unit B print free)
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "parted failed with rc $rc"
|
||||
exit 15
|
||||
fi
|
||||
|
||||
endresult=$(tail -1 <<< "$endresult" | cut -d ':' -f 2 | tr -d 'B')
|
||||
logVariables $LINENO endresult
|
||||
truncate -s "$endresult" "$img"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "trunate failed with rc $rc"
|
||||
exit 16
|
||||
endresult=$(tail -1 <<< "$endresult" | cut -d ':' -f 2 | tr -d 'B')
|
||||
logVariables $LINENO endresult
|
||||
truncate -s "$endresult" "$img"
|
||||
rc=$?
|
||||
if (( $rc )); then
|
||||
error $LINENO "trunate failed with rc $rc"
|
||||
exit 16
|
||||
fi
|
||||
fi
|
||||
|
||||
# handle compression
|
||||
if [[ -n $ziptool ]]; then
|
||||
info "Compressing"
|
||||
options=""
|
||||
envVarname="${MYNAME^^}_${ziptool^^}" # PISHRINK_GZIP or PISHRINK_XZ environment variables allow to override all options for gzip or xz
|
||||
[[ $parallel == true ]] && options="${ZIP_PARALLEL_OPTIONS[$ziptool]}"
|
||||
|
|
@ -453,4 +450,5 @@ fi
|
|||
aftersize=$(ls -lh "$img" | cut -d ' ' -f 5)
|
||||
logVariables $LINENO aftersize
|
||||
|
||||
info "Shrunk $img from $beforesize to $aftersize"
|
||||
info "Shrunk/compressed $img from $beforesize to $aftersize"
|
||||
ls -lh "$img"
|
||||
|
|
|
|||
Loading…
Reference in New Issue