build.md 2.5 KB
process
build kernel with initramfs
initramfs /etc/init runs exec busybox switch_root /v3 /opt/wz_mini/etc/init.d/v3_init.sh
bind replace ```/etc/init.d/inittab``` with out own version that has rcS located at ```/opt/wz_mini/tmp/.storage/rcS```
bind replaces ```/etc/profile```
mounts ```/tmp``` and ```/run```
mounts ```/system```
bind replaces ```/system/bin/factorycheck```, this program unmounts the binds that we do later in the file, its a debug program.
bind replaces ```/etc/fstab```
creates wz_mini's workplace directory at ```/opt/wz_mini/tmp```
copies the stock ```/etc/init.d/rcS``` to the workplace directory
modifies the stock rcS, adds ```set -x``` debug mode and injects the following script ```/opt/wz_mini/etc/init.d/v3_post.sh``` ro run
bind replaces ```/etc/shadow``` to change the stock password
checks to see if the swap archive is present at ```/opt/wz_mini/swap.gz```, if it is, extracts it, then mkswap's it, and drops the vm cache.
check to see if the ```/opt/wz_mini/usr/share/terminfo``` directory is present, if not, extract the terminfo files for console programs
mounts ```/configs``` to check if the ```.ssh``` dir is present, a requirement for the dropbear ssh server
checks to see if ```/opt/wz_mini/run_mmc.sh``` has debug mode enabled, if it does, skip loading ```/system/bin/app_init.sh``` and ```/media/mmc/wz_mini/run_mmc.sh```
run ```/media/mmc/wz_mini/run_mmc.sh```, but delay execution for 30 seconds, enough time for WiFi or wired ethernet/usb to load and connect successfully to the internet
runs ```/linuxrc``` to kick off the stock boot process
our modified inittab runs from ```/opt/wz_mini/tmp/.storage/rcS```, we have enabled set -x debug info, added ```/opt/wz_mini/bin``` and ```/opt/wz_mini/lib``` to the system PATH's, and added ```/opt/wz_mini/etc/init.d/v3_post.sh``` to run before ```/system/init/app_init.sh``` runs.
/opt/wz_mini/etc/init.d/v3_post.shchecks ifrun_mmc.shhas the RTSP server enabled, and if it does, we copy/system/bin/iCamerato our workplace directory at/opt/wz_mini/tmp/.storage/```
bind replace /system/bin/iCamera
our version of iCamera is a script which injects the libcallback.so library as LD_PRELOAD to hook the Audio and Video to the RTSP Server, calling iCamera from it's new home at /opt/wz_mini/tmp/.storage/
we then load the video loopback driver from /opt/wz_mini/lib/modules/v4l2loopback.ko
/system/bin/app_init.sh loads the stock system software