CopterExpress/clover
1
0
Fork 0
mirror of https://github.com/CopterExpress/clover.git synced 2026-05-29 22:39:33 +00:00
Code Issues Packages Projects Releases Wiki Activity

image_builder: add image-shrinker

Browse Source
This commit is contained in:
Artem Smirnov
2018-05-30 23:38:42 +03:00
parent 06a01f7e32
commit 0d0c8e54f4
1 changed files with 93 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

93
image_builder/autosizer.sh Executable file
View File

@@ -0,0 +1,93 @@
#!/bin/bash
set -e
if [ $(whoami) != "root" ]; then
echo \
&& echo "********************************************************************" \
&& echo "******************** This should be run as root ********************" \
&& echo "********************************************************************" \
&& echo \
&& exit 1
fi
if [[ -z $1 ]]; then
echo "================================================================================"
echo -e "\033[0;31m\033[1mAutomatic Image file resizer\033[0m\033[0m"
echo -e "\033[0;31m\033[1mDescription:\033[0m\033[0m This script shrink your image to 100MB free space"
echo -e "\033[0;31m\033[1mAuthors:\033[0m\033[0m Artem Smirnov @urpylka, SirLagz"
echo
echo -e "\033[0;31m\033[1mUsage:\033[0m\033[0m ./autosizer.sh PATH_TO_IMAGE"
echo
echo -e "\033[0;31m\033[1mRequirements:\033[0m\033[0m parted, losetup, e2fsck, resize2fs, bc, truncate"
echo "================================================================================"
exit 0
fi
echo "================================================================================"
strImgFile=$1
echo -e "\033[0;31m\033[1mPath to image: $strImgFile\033[0m\033[0m"
echo "================================================================================"
if [[ ! -e $strImgFile ]]; then
echo -e "\033[0;31m\033[1mError: File doesn't exist\033[0m\033[0m"
echo
exit 1
fi
echo "================================================================================"
partinfo=`parted -m $strImgFile unit B print`
echo -e "\033[0;31m\033[1mPartition information:\033[0m\033[0m\n$partinfo"
echo "================================================================================"
partnumber=`echo "$partinfo" | grep ext4 | awk -F: '{ print $1 }'`
echo -e "\033[0;31m\033[1mPartition number: $partnumber\033[0m\033[0m"
echo "================================================================================"
partstart=`echo "$partinfo" | grep ext4 | awk -F: '{ print substr($2,0,length($2)-1) }'`
echo -e "\033[0;31m\033[1mPartition start: $partstart (bytes)\033[0m\033[0m"
echo "================================================================================"
loopback=`losetup -f --show -o $partstart $strImgFile`
echo -e "\033[0;31m\033[1mLoopback device: $loopback\033[0m\033[0m"
echo "================================================================================"
set +e
e2fsck -fvy $loopback
set -e
echo "================================================================================"
minsize=`resize2fs -P $loopback | awk -F': ' '{ print $2 }'`
#minsize=`resize2fs -P $loopback 2> /dev/null | awk -F': ' '{ print $2 }'`
echo -e "\033[0;31m\033[1mMinsize: $minsize (4k)\033[0m\033[0m"
echo "================================================================================"
# Add 100MB free space to image 4096 (bytes) * 25000 = 102,400,000
minsize=`echo "$minsize+25000" | bc`
echo -e "\033[0;31m\033[1mMinsize + 25000 (4k): $minsize (4k)\033[0m\033[0m"
echo "================================================================================"
resize2fs -p $loopback $minsize
sleep 1
losetup -d $loopback
echo "================================================================================"
partnewsize=`echo "$minsize * 4096" | bc`
echo -e "\033[0;31m\033[1mNew size of part: $minsize (4k) = $partnewsize (bytes)\033[0m\033[0m"
echo "================================================================================"
newpartend=`echo "$partstart + $partnewsize" | bc`
echo -e "\033[0;31m\033[1mNew end of part (Part start + part new size):\033[0m\033[0m"
echo -e "\033[0;31m\033[1m$partstart (bytes) + $partnewsize (bytes) = $newpartend (bytes)\033[0m\033[0m"
echo "================================================================================"
part1=`parted $strImgFile rm 2`
echo "================================================================================"
part2=`parted $strImgFile unit B mkpart primary $partstart $newpartend`
echo "================================================================================"
endresult=`parted -m $strImgFile unit B print free | tail -1 | awk -F: '{ print substr($2,0,length($2)-1) }'`
echo -e "\033[0;31m\033[1mSize of result image: $endresult (bytes)\033[0m\033[0m"
echo "================================================================================"
truncate -s $endresult $strImgFile