首先，分析的是/etc/youku/rc.main這個文件，它負責優酷相干服務的初始化、啟動和結束。
這個腳本1開始先export YoukuHome=”/tmp/youku”，設置1個路徑。
接下來是幾個無關緊要的函數
ylog()
{
#format: /etc/youku/rc.main ylog "logstring"
[ -n "$@" ] && echo `date +%Y-%m-%d-%H-%M-%m`" $@" | tee -ai $YoukuHome/log/boot.log
}
#add by David
_log()
{
_DEBUG=0;
if [ "${_DEBUG}" -eq 1 ]; then
echo $1 >> $YoukuHome/log/rc.log
fi
}
help()
{
cat <<EOF
Syntax: $action
Available commands:
start Start all youku services
stop Stop all youku services
ikuacc start|stop
tf mount|umount dectect TF storage card
usb mount|umount dectect USB storage disk
help
EOF
}在start函數中調用了6個函數履行不同的任務。bootup目錄創建等1些準備工作，tf掛載tf卡，usb掛載u盤，setup設置，checkYoukuSN檢查sn，還有versionupdate和youku_luci接下來會講。
start() {
ylog "rc.main start ..."
bootup
tf mount
usb mount
setup
checkYoukuSN
versionupdate
# start youkucmc with procd.
# ikuacc start
youku_luci
ylog "rc.main start finished"
return 0
}bootup() {
[ -d "$YoukuHome" ] && return 0; #這段代碼先測試了$YoukuHome是不是存在，存在就不用再履行下去了,下面是不存在$YoukuHome的情況。
# ensure youku directory structure and env var.
#use /tmp/youku/* to point the latest youku app, web, and script.
# use system tmpfs or ourselves. the later is easy to evaluation memory used.
mkdir -p $YoukuHome #建立$YoukuHome目錄
mount -t tmpfs tmpfs $YoukuHome -o size=4m
#mkdir -p $YoukuHome/log
echo `date +%Y-%m-%d-%H-%M-%S`" rc.main bootup ..." > $YoukuHome/log/boot.log
mkdir -p $YoukuHome/mnt #used for tf storage card and usb storage
mkdir -p $YoukuHome/sys
mkdir -p $YoukuHome/stat
mkdir -p $YoukuHome/cfg
mkdir -p $YoukuHome/bin
mkdir -p $YoukuHome/pub #used for link shared resources which can be seen out of router.
mkdir -p $YoukuHome/ver #used for save version info of firmware and packages.
mkdir -p $YoukuHome/data #used for storage big size of data. visit if from $YoukuHome/var
mount -t tmpfs tmpfs $YoukuHome/data -o size=4m #give 4m as default,
ln -sfn $YoukuHome/data $YoukuHome/pkg #redirect $YoukuHome/pkg to tf or usb storage if possible.
#ln -sfn $YoukuHome/data $YoukuHome/var #redirect $YoukuHome/var to tf or usb storage if possible.
ln -sfn $YoukuHome/data $YoukuHome/tmp #redirect $YoukuHome/tmp to tf or usb storage if possible.
ln -sfn $YoukuHome/data $YoukuHome/log
mkdir -p $YoukuHome/var
mkdir -p $YoukuHome/var/ikucmc
mkdir -p $YoukuHome/var/ikuacc
#mkdir -p $YoukuHome/var/ikuacc/meta #used for ikuacc meta
mkdir -p $YoukuHome/var/ikuacc/data #used for ikuacc data, youkudisk.
#FIXME just for debug. yang,2014-09-05,let it to be seen in web, remove it when publish
#ylog "rc.main bootup ln -sfn / $YoukuHome/pub/root"
#ln -sfn / $YoukuHome/pub/root
ylog "rc.main bootup finished."
return 0
}
第11行把tmpfs掛載到$YoukuHome。第17~26行建立了1些目錄，
第27行又在$YoukuHome/data掛載tmpfs，第29~32行建立了1些軟連接，第34~38行建立了ikuacc的1些目錄。
tf() {
ylog "rc.main tf ....[$@]"
index=0;
###################################################
#partitions,add by David
partition_sd
RetTmp=$?
if [ "$RetTmp" -eq 1 ]; then
{
_log "RetTmp=$RetTmp, return"
return
}
fi
#do mount operation
if [ "-$1" = "-mount" ]; then
{
[ `find /dev/ -type b -name mmcblk* | wc -l` -gt 0 ] || {
ylog "rc.main tf: no tf device found, exit 1"
return 1
}
for devfile in `ls /dev/ | grep mmcblk | grep p`; do
{
_log "mount start"
mkdir $YoukuHome/mnt/tf$index
mount /dev/$devfile $YoukuHome/mnt/tf$index -o errors=continue
RETVAL=$?
if [ $RETVAL = 0 ]; then
ylog "rc.main tf mounted: /dev/$devfile ==> $YoukuHome/mnt/tf$index"
index=$(($index+1)) #prepare to mount next
else
ylog "rc.main tf mounted failure: /dev/$devfile ==> $YoukuHome/mnt/tf$index"
rmdir $YoukuHome/mnt/tf$index
fi
}
done
#
last=$(($index-1))
for i in `seq 0 $last`; do
storage_mounted "tf" "$YoukuHome/mnt/tf$i" "$index" "$i"
done
}
fi
####################################################
#do unmount operation
if [ "-$1" = "-umount" ]; then
{
for tfdir in `ls $YoukuHome/mnt/ | grep tf`; do
{
umount $YoukuHome/mnt/$tfdir
rmdir $YoukuHome/mnt/$tfdir
rm $YoukuHome/pub/$tfdir
index=$(($index+1))
ylog "rc.main tf umounted ==> $YoukuHome/mnt/$tfdir"
}
done
}
fi
#setup bin links again if something changed.
[ $index -gt 0 ] && setup
return 0
}第8~15行，調用了partition_sd，接下來會講，檢查partition_sd的返回值，沒甚么實際作用。
如果參數是mount，履行第17~49行掛載sd；如果參數是umount，履行第53~66行卸載sd卡。
第21~24行，看看裝備中有無塊裝備叫做mmcblk*的，這類不出意外就是sd卡了，否則就返回1。
第26~39就是枚舉并掛載sd卡了。其中，第29行創建掛載的目錄，第30行掛載sd卡到該目錄。
第43~46行調用storage_mounted，這個函數里面創建了1些軟連接，后面會講。
第53~66行就是umount部份，卸載并刪除掛載目錄和軟連接。特別注意還有個第69行，履行setup，后面會講。
usb() {
ylog "rc.main usb ....[$@]"
index=0;
###################################################
#do mount operation
if [ "-$1" = "-mount" ]; then
{
[ `find /dev/ -type b -name sd* | wc -l` -gt 0 ] || {
ylog "rc.main tf: no usb storage device found, exit 1"
return 1
}
for devfile in `ls /dev/ | grep -e sda -e sdb -e sdc`; do
{
mkdir $YoukuHome/mnt/usb$index
mount /dev/$devfile $YoukuHome/mnt/usb$index
RETVAL=$?
if [ $RETVAL = 0 ]; then
ylog "rc.main usb mounted: /dev/$devfile ==> $YoukuHome/mnt/usb$index"
index=$(($index+1)) #prepare to mount next
else
ylog "rc.main usb mounted failure: /dev/$devfile ==> $YoukuHome/mnt/usb$index"
rmdir $YoukuHome/mnt/usb$index
fi
}
done
#
last=$(($index-1))
for i in `seq 0 $last`; do
storage_mounted "usb" "$YoukuHome/mnt/usb$i" "$index" "$i"
done
}
fi
####################################################
#do unmount operation
if [ "-$1" = "-umount" ]; then
{
for usbdir in `ls $YoukuHome/mnt/ | grep usb`; do
{
umount $YoukuHome/mnt/$usbdir
rmdir $YoukuHome/mnt/$usbdir
rm $YoukuHome/pub/$usbdir
index=$(($index+1))
ylog "rc.main usb umounted ==> $YoukuHome/mnt/$usbdir"
}
done
}
fi
#setup bin links again if something changed.
[ $index -gt 0 ] && setup
return 0;
}進程跟掛載和卸載tf卡差不多。
setup() {
ylog "rc.main setup ..."
#set default .or when some disk umounted
[ -L $YoukuHome/bin/youkucmc -a -f "`readlink -f $YoukuHome/bin/youkucmc`" ] || ln -sfn /usr/sbin/guard $YoukuHome/bin/youkucmc
[ -L $YoukuHome//bin/ikuacc -a -f "`readlink -f $YoukuHome/bin/ikuacc`" ] || ln -sfn /usr/sbin/ikuacc $YoukuHome/bin/ikuacc
[ -L $YoukuHome/bin/sn_youku -a -f "`readlink -f $YoukuHome/bin/sn_youku`" ] || ln -sfn /usr/sbin/sn_youku $YoukuHome/bin/sn_youku
[ -L $YoukuHome/www -a -d "`readlink -f $YoukuHome/www`" ] || ln -sfn /www/ $YoukuHome/www
#let publish resouces can be seen from web
[ -L $YoukuHome/www/pub -o -d $YoukuHome/www/pub ] || ln -sfn $YoukuHome/pub $YoukuHome/www/pub
ylog "rc.main setup: cur www path=>[`readlink -f $YoukuHome/www`]"
#####################################################################
#select space for save data,suck as ikuacc virtual disk and so on.
#[ -L $YoukuHome/var -a -d "`readlink -f $YoukuHome/var`" ] || ln -sfn $YoukuHome/data $YoukuHome/var
ylog "rc.main setup: cur var path=>[`readlink -f $YoukuHome/var`]"
flag=0
minsize=0
maxsize=0
mindisk=0
maxdisk=0
cd $YoukuHome/mnt
#get smallest and biggest start partition
for p in `ls $YoukuHome/mnt | grep -e tf -e usb | sort`; do
{
newsize=`df -m | grep $YoukuHome/mnt/$p | awk '{print $2 }'`
[ -z $newsize ] && newsize=0
[ ${flag} -eq 0 ] && {
flag=1
minsize=${newsize}
maxsize=${newsize}
mindisk=${YoukuHome}/mnt/$p
maxdisk=${YoukuHome}/mnt/$p
}
[ ${newsize} -lt ${minsize} ] && {
mindisk=${YoukuHome}/mnt/$p
minsize=${newsize}
}
[ ${newsize} -gt ${maxsize} ] && {
maxdisk=${YoukuHome}/mnt/$p
maxsize=${newsize}
}
};
done
_log "minsize=${minsize}, mindisk=${mindisk}"
_log "maxsize=${maxsize}, maxdisk=${maxdisk}"
[ ${minsize} -gt 100 ] && {
if [ "${mindisk}/meta" != "`readlink -f ${YoukuHome}/var/ikuacc/meta`" ]; then
{
[ -d ${YoukuHome}/var/ikuacc/meta ] && cp -rfp ${YoukuHome}/var/ikuacc/meta/* ${mindisk}/youku/var/ikuacc/meta #only copy meta to new space.
mkdir -p ${mindisk}/meta
#mkdir -p $YoukuHome/var/ikuacc/meta
ln -sfn ${mindisk}/meta ${YoukuHome}/var/ikuacc/meta
}
fi
if [ "`readlink -f $YoukuHome/pkg`" != "${mindisk}/youku/bin" ]; then
{
mkdir -p ${mindisk}/youku/bin
ln -sfn ${mindisk}/youku/bin $YoukuHome/pkg
mkdir -p ${mindisk}/youku/tmp
ln -sfn ${mindisk}/youku/tmp $YoukuHome/tmp
mkdir -p ${mindisk}/youku/log
ln -sfn ${mindisk}/youku/log $YoukuHome/log
ylog "rc.main setup: set pkg path=>[size=$newsize Mb,${mindisk}/youku/bin"
ylog "rc.main setup: set tmp path=>[size=$newsize Mb,${mindisk}/youku/tmp"
}
fi
}
#mount data0~data3
cnt=0
for p in `ls $YoukuHome/mnt | grep -e tf | sort`; do
{
partsize=`df -m | grep $YoukuHome/mnt/$p | awk '{print $2 }'`
[ ${partsize} -gt 500 ] && {
_log "mount data, partsize=${partsize}"
#mkdir -p $YoukuHome/var/ikuacc/data/data${cnt}
ln -sfn $YoukuHome/mnt/$p $YoukuHome/var/ikuacc/data/data${cnt}
cnt=$((${cnt}+1))
}
};
done
#### add by xiongying for 1.5 branch patch
[ -f /usr/sbin/patch.sh ] && /bin/sh /usr/sbin/patch.sh
#####################################################################
#go to default work directory
cd $YoukuHome/tmp
ylog "rc.main setup finished."
return 1
}
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