327 lines
10 KiB
Bash
Executable File
327 lines
10 KiB
Bash
Executable File
#!/bin/bash
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###############################################################
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# step:
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# 1. get all apps in bin/, sbin/, usr/bin, usr/sbin, and get
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# libraries these apps depend on.
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# 2. get libraries these libraries(from 1st step) depend on.
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# 3. get soft-link libraries if exist.
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# 4. remove libraries that have not been used.
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###############################################################
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SH_NAME=$0
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OP_FLAG=$1
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ROOT_DIR=${2%/} # rm '/' at the end of of a directory path if it has.
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help_info()
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{
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# get the basename of this scripts
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local shell_name=`basename $SH_NAME`
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echo -e "v1.1\n"
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echo -e "This script will downsize the rootfs or check the downsizing result!\n"
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echo -e "\033[32mUsage:\n\t./$shell_name <op_flag> <root_dir>\033[0m\n"
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echo -e "\t<op_flag>: operation.\n\t\t d - downsize rootfs\n\t\t c - check the downsizing result"
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echo -e "\t<root_dir>: the relative directory of your rootfs.\n"
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}
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################################################################################
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# function: get the library dependency of source file
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# $1: the source file.
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# $2: the library dependency of source file.
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# $3: the dlopen library dependency of source file.
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################################################################################
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get_libs()
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{
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#readelf -s $ROOT_DIR/$app_name | grep "\<UND dlopen\>" > /dev/null 2>&1
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strings -a $1 | grep dlopen > /dev/null
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if [ $? -ne 0 ]; then
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local file_based_libs=`readelf -d $1 | grep NEEDED | sed -r 's/.*\[(.*)\].*/\1/'`
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else
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local file_based_libs_readelf=`readelf -d $1 | grep NEEDED | sed -r 's/.*\[(.*)\].*/\1/'`
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local file_based_libs=`strings -a $1 | grep -e "\.so\." -e "\.so$" | sed -r 's/.*\/(.*)/\1/'`
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for lib_name in $file_based_libs
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do
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echo $file_based_libs_readelf | grep $lib_name > /dev/null
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if [ $? -ne 0 ]; then
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echo "$lib_name" >> $3
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fi
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done
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fi
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echo "$file_based_libs" >> $2
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# check the existence of source-file's based libs.
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if [ "x$OP_FLAG" == "xd" ]; then
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for lib_name in $file_based_libs
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do
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if [ ! -f "$ROOT_DIR/lib/$lib_name" ]; then
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if [ ! -f "$ROOT_DIR/usr/lib/$lib_name" ]; then
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if [ -f "$3" ]; then
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grep $lib_name $3 > /dev/null
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if [ $? -eq 0 ]; then
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if [ ! -f "$ROOT_DIR/warning_file.txt" -a ! -f "$ROOT_DIR/warning_lib.txt" ]; then
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echo -e "\033[33m==WARNING==\033[0m file: $1，missing dlopen lib: $lib_name"
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echo "$1" >> $ROOT_DIR/warning_file.txt
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echo "$lib_name" >> $ROOT_DIR/warning_lib.txt
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else
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grep $1 $ROOT_DIR/warning_file.txt > /dev/null && grep $lib_name $ROOT_DIR/warning_lib.txt > /dev/null
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if [ $? -ne 0 ]; then
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echo -e "\033[33m==WARNING==\033[0m file: $1，missing dlopen lib: $lib_name"
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echo "$1" >> $ROOT_DIR/warning_file.txt
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echo "$lib_name" >> $ROOT_DIR/warning_lib.txt
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fi
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fi
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else
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echo -e "\033[31m==ERROR==\033[0m file: $1，missing lib: $lib_name"
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rm -f $ROOT_DIR/*.txt
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exit
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fi
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else
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echo -e "\033[31m==ERROR==\033[0m file: $1，missing lib: $lib_name"
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rm -f $ROOT_DIR/*.txt
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exit
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fi
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fi
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fi
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done
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fi
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}
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################################################################################
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# function: get the library dependency of librires.
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# $1: the file contains librires' name.
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# $2: the library dependency of all librires in $1.
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# $3: the dlopen library dependency of all librires in $1.
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################################################################################
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get_libs_extend()
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{
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while read lib_name
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do
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if [ -f "$ROOT_DIR/lib/$lib_name" ]; then
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get_libs $ROOT_DIR/lib/$lib_name $2 $3
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else
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if [ -f "$ROOT_DIR/usr/lib/$lib_name" ]; then
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get_libs $ROOT_DIR/usr/lib/$lib_name $2 $3
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fi
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fi
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done < $1
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#keep every library only once
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sort -u $2 -o $2
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if [ -f "$3" ]; then
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sort -u $3 -o $3
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fi
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}
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get_app_based_libs()
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{
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#get all executable files.
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if [ -z "$2" ]; then
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local regular_file=`find $ROOT_DIR/$1 -maxdepth 1 -type f`
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else
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local regular_file=`find $ROOT_DIR/$1/$2 -maxdepth 1 -type f`
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fi
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for app_name in $regular_file
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do
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file $app_name | grep ELF | grep "executable" | grep "dynamically linked" > /dev/null
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if [ $? -eq 0 ]; then
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get_libs $app_name $ROOT_DIR/app-based-libs.txt $ROOT_DIR/dlopen-libs.txt
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fi
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done
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}
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# get used libcedarx function
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get_used_libcedarx()
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{
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if [ -f $ROOT_DIR/etc/cedarx.conf ]; then
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local used_libcedarx=`grep "^l.*.so$" $ROOT_DIR/etc/cedarx.conf | awk '{print $3}'`
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for libcedarx_name in $used_libcedarx
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do
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if [ ! -f "$ROOT_DIR/lib/$libcedarx_name" ]; then
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if [ ! -f "$ROOT_DIR/usr/lib/$libcedarx_name" ]; then
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echo -e "\033[31m==ERROR==\033[0m can't find $libcedarx_name (refer to $ROOT_DIR/etc/cedarx.conf) in rootfs."
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rm -f $ROOT_DIR/*.txt
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exit
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fi
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fi
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done
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echo "$used_libcedarx" >> $ROOT_DIR/app-based-libs.txt
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fi
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}
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get_lib_based_libs()
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{
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# for glibc, add /lib/libnss_* and libresolv*. refer to https://sourceware.org/ml/libc-help/2009-05/msg00046.html
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find $ROOT_DIR/lib -maxdepth 1 -name libnss_* -o -name libresolv* | sed -r 's/.*\/(.*)/\1/' >> $ROOT_DIR/app-based-libs.txt
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#keep every library only once
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sort -u $ROOT_DIR/app-based-libs.txt -o $ROOT_DIR/app-based-libs.txt
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cp $ROOT_DIR/app-based-libs.txt $ROOT_DIR/all-based-libs-tmp.txt
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#get lib based lib
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while true
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do
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cp -f $ROOT_DIR/all-based-libs-tmp.txt $ROOT_DIR/all-based-libs-tmp-diff.txt
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if [ -f "$ROOT_DIR/dlopen-libs.txt" ]; then
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cp -f $ROOT_DIR/dlopen-libs.txt $ROOT_DIR/dlopen-libs-diff.txt
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fi
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cp -f $ROOT_DIR/all-based-libs-tmp.txt $ROOT_DIR/app-based-libs.txt
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get_libs_extend $ROOT_DIR/app-based-libs.txt $ROOT_DIR/all-based-libs-tmp.txt $ROOT_DIR/dlopen-libs.txt
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diff $ROOT_DIR/all-based-libs-tmp.txt $ROOT_DIR/all-based-libs-tmp-diff.txt > /dev/null
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if [ $? -eq 0 ]; then
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[ ! -f $ROOT_DIR/dlopen-libs.txt ] && break
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[ ! -f $ROOT_DIR/dlopen-libs-diff.txt ] && break
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diff $ROOT_DIR/dlopen-libs.txt $ROOT_DIR/dlopen-libs-diff.txt > /dev/null
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if [ $? -eq 0 ]; then
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rm -f $ROOT_DIR/all-based-libs-tmp-diff.txt $ROOT_DIR/dlopen-libs-diff.txt
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break
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fi
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fi
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done
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while read ol
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do
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if [ -f "$ROOT_DIR/lib/$ol" ]; then
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echo "lib/$ol" >> $ROOT_DIR/lib-based-libs.txt
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# for case: $ol -> $target_lib, get the $target_lib
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local target_lib=` readlink $ROOT_DIR/lib/$ol `
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# if $ol is a soft-link library, add the $target_lib library.
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if [ -n "$target_lib" ]; then
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echo "lib/$target_lib" >> $ROOT_DIR/lib-based-libs.txt
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fi
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# for case: $link_lib -> $ol, get the $link_lib (only the same dir)
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local link_lib=`ls -l $ROOT_DIR/lib | grep "^l.*$ol$" | awk -F'->' '{print $1}' | awk '{print $NF}'`
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# if $link_lib links to $ol, add the $link_lib library.
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if [ -n "$link_lib" ]; then
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echo "lib/$link_lib" >> $ROOT_DIR/lib-based-libs.txt
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fi
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else
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if [ -f "$ROOT_DIR/usr/lib/$ol" ]; then
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echo "usr/lib/$ol" >> $ROOT_DIR/lib-based-libs.txt
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# for case: $ol -> $target_lib, get the $target_lib
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local target_lib=` readlink $ROOT_DIR/usr/lib/$ol `
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# if $ol is a soft-link library, add the $target_lib library.
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if [ -n "$target_lib" ]; then
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echo "usr/lib/$target_lib" >> $ROOT_DIR/lib-based-libs.txt
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fi
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# for case: $link_lib -> $ol, get the $link_lib (only the same dir)
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local link_lib=`ls -l $ROOT_DIR/usr/lib | grep "^l.*$ol$" | awk -F'->' '{print $1}' | awk '{print $NF}'`
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# if $link_lib links to $ol, add the $link_lib library.
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if [ -n "$link_lib" ]; then
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echo "usr/lib/$link_lib" >> $ROOT_DIR/lib-based-libs.txt
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fi
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fi
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fi
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done < $ROOT_DIR/all-based-libs-tmp.txt
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# sort -u $ROOT_DIR/lib-based-libs.txt
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}
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downsize_rootfs()
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{
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find $ROOT_DIR/lib -maxdepth 1 -type f -o -type l | sed -r 's/.*\/(.*)/\1/' | grep -e "^ld" -e "^lib" | sed "s/^/lib\//g" | sort >> $ROOT_DIR/libs.txt
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find $ROOT_DIR/usr/lib -maxdepth 1 -type f -o -type l | sed -r 's/.*\/(.*)/\1/' | grep -e "^ld" -e "^lib" | sed "s/^/usr\/lib\//g" | sort >> $ROOT_DIR/libs.txt
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# another way
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# find lib -maxdepth 1 -type f -printf '%f\n' -o -type l -printf '%f\n' | grep -e "^ld" -e "^lib" | sed "s/^/lib\//g" | sort >> $ROOT_DIR/libs.txt
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if [ "x$OP_FLAG" == "xd" ]; then
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rm -rf `cat $ROOT_DIR/lib-based-libs.txt $ROOT_DIR/libs.txt | sort | uniq -u | sed "s#^#$ROOT_DIR/#g"`
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fi
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if [ "x$OP_FLAG" == "xc" ]; then
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# for case $OP_FLAG is equal to 'c'
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local diff_lib=`cat $ROOT_DIR/lib-based-libs.txt $ROOT_DIR/libs.txt | sort | uniq -u`
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if [ -n "$diff_lib" ]; then
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echo -e "Check result:\033[31m==ERROR==\033[0m following libraries have not been used:\n$diff_lib"
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else
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echo -e "Check result:\033[32m==RIGHT==\033[0m"
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fi
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fi
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# rm unused minigui res
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if [ -f "$ROOT_DIR/usr/local/etc/MiniGUI.cfg" ]; then
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find $ROOT_DIR/usr/share/local/minigui -type f > $ROOT_DIR/minigui_res.txt
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grep -E '\.bmp|\.gif|\.cur|\.bin|\.ico|\.upf|\.vbf|\.name' $ROOT_DIR//usr/local/etc/MiniGUI.cfg | grep -v '^#' | sed -r 's/.*=(.*)/\1/' | sed -r 's/.*\/(.*)/\1/' > $ROOT_DIR/minigui_used_res.txt
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while read res_name
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do
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sed -i "/$res_name/d" $ROOT_DIR/minigui_res.txt
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done < $ROOT_DIR/minigui_used_res.txt
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if [ "x$OP_FLAG" == "xd" ]; then
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rm -rf `cat $ROOT_DIR/minigui_res.txt`
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fi
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if [ "x$OP_FLAG" == "xc" ]; then
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if [ ! -s "$ROOT_DIR/minigui_res.txt" ]; then
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echo -e "MiniGUI Check result:\033[32m==RIGHT==\033[0m"
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fi
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fi
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fi
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rm -f $ROOT_DIR/*.txt
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}
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###############################################################################
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if [ $# -ne 2 ]; then
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help_info
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exit
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fi
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if [ "x$OP_FLAG" != "xd" ]; then
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if [ "x$OP_FLAG" != "xc" ]; then
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help_info
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echo -e "\t\033[31m==ERROR==\033[0m <op_flag>: '$OP_FLAG' should be 'd' or 'c'"
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exit
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fi
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fi
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if [ ! -d "$ROOT_DIR" ]; then
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help_info
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echo -e "\t\033[31m==ERROR==\033[0m <root_dir>: '$ROOT_DIR' does not exist!"
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exit
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fi
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if [ "x$OP_FLAG" == "xd" ]; then
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if [ -d "${ROOT_DIR}-tmp" ]; then
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echo "Directory ${ROOT_DIR}-tmp is exist!"
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cp -rf $ROOT_DIR/. ${ROOT_DIR}-tmp
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else
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echo "Directory ${ROOT_DIR}-tmp is not exist, back it up!"
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cp -narf $ROOT_DIR ${ROOT_DIR}-tmp
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fi
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fi
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get_app_based_libs bin
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get_app_based_libs sbin
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get_app_based_libs usr bin
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get_app_based_libs usr sbin
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get_used_libcedarx
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get_lib_based_libs
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downsize_rootfs
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