If you repeat the steps above using a standard account, a lot of the files will be missing.
c. Take a look at the file "proj1/createiso". This will create a filesystem on a loop back device with the mount point "./cdrom". Copy the contents of "_install", which has already been compiled with the necessary busybox code. Once it is copied, umount "./cdrom" so that it can be compressed. This will then get copied to the staging area where "mkisofs" will create a bootable CD image. The boot loader isolinux, along with the needed config files can be found in "proj1/staging_iso_image/boot/isolinux/"
There is a bash script "createiso" that performs the above tasks.
$ cd proj1 $ su # ./createiso
Take a look at "createiso". This bash script creates a virtual filesystem. For details on creating a virtual filesystem reference the following article on Freshmeat [ http://freshmeat.net/articles/view/1387/ ]
COMPREHENSIVE TUTORIAL: Building Everything from Downloaded Source
You may want to keep the results of the quick install steps above in a separate directory to compare against the completion of each step below.
STEP 1: Download BusyBox
Download BusyBox (http://www.busybox.net/downloads/). These examples were created with http://www.busybox.net/downloads/busybox-1.00.tar.gz.
$ wget http://www.busybox.net/downloads/busybox-1.00.tar.gz $ wget http://www.busybox.net/downloads/busybox-1.00.tar.gz.sign $ md5sum busybox-1.00.tar.gz fa62459e098fc00b22772aaf2e75bc98 busybox-1.00.tar.gzNext expand the files:
$ tar -xzf busybox-1.00.tar.gz
Note if you want to verify Erik's key:
$ wget http://codepoet.org/andersen/erik/gpg.asc $ gpg --import gpg.asc $ gpg --verify busybox-1.00.tar.gz.sign
Now look inside busybox-1.00.tar.gz.sign for the md5sum. Note, he has done it differently than it's done with the 2.6 kernel (reference step 9).
STEP 2: Configuring BusyBox
You may want to download my config for BusyBox and rename it to ".config". I have the needed features turned on.
My config download can be found here: http://prdownloads.sourceforge.net/souptonuts/chiricobusybox.config
$ cd busybox-1.00 [Note you may need to select another mirror] $ wget http://osdn.dl.sourceforge.net/sourceforge/souptonuts/chiricobusybox.config $ cp chiricobusybox.config .config
You should take a look at the options that I have set by running "make menuconfig" or take a look at "chiricobusybox.config" directly.
$ make menuconfig
In particular, "Support version 2.6.x Linux kernels" is checked. Under "Login/Password Management Utilities" everything is checked EXCEPT "Use internal password and group functions". Note, at this stage you do NOT want to select this option because "/etc/passwd", "/etc/shadow" and "/etc/shadow-", will be copied to the "_install/etc" directory, and used instead.
Also, "lsmod", "modprobe", "rmmod" are checked. Although not essential for the initial build, this system you are building will support networking. You may eventually want to scp in modules and load them, once you get the system running, of course. There is plenty of space for these modules.
After taking a look at ".config", run "make" and "make install", which by default will install everything under "_install".
$ make $ make install
During the final stages of "make install" the following message will be displayed.
-------------------------------------------------- You will probably need to make your busybox binary setuid root to ensure all configured applets will work properly. --------------------------------------------------
The next command must be executed after each "make install" to setuid root on the BusyBox binary.
$ chmod 4755 ./_install/bin/busybox
STEP 3: Needed Directories
Several directories need to be created under "_install". Take a look at the current contents.
$ cd _install $ ls bin linuxrc sbin usr
Next create "dev" for "device entries", which will be populated later, "etc", "lib", "proc", "tmp", "var" and "sys" with the following commands.
$ mkdir -p dev sys etc/init.d lib proc tmp var/lib/misc var/lock var/log var/run var/tmp $ chmod 1777 tmp $ chmod 1777 var/tmp文章整理：西部数码--专业提供域名注册、虚拟主机服务
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