README
Overview
This directory contains logic to support a custom ROMFS system-init script and start-up script. These scripts are used by by the NSH when it starts provided that CONFIG_ETC_ROMFS=y. These scripts provide a ROMFS volume that will be mounted at /etc and will look like this at run-time:
NuttShell (NSH) NuttX-8.2
nsh> ls -l /etc
/etc:
dr-xr-xr-x 0 .
-r--r--r-- 20 group
dr-xr-xr-x 0 init.d/
-r--r--r-- 35 passwd
/etc/init.d:
dr-xr-xr-x 0 ..
-r--r--r-- 110 rcS
-r--r--r-- 110 rc.sysinit
nsh>
/etc/init.d/rc.sysinit is system init script; /etc/init.d/rcS is the start-up script; /etc/passwd is a the password file. It supports a single user:
USERNAME: admin
PASSWORD: Administrator
nsh> cat /etc/passwd
admin:8Tv+Hbmr3pLVb5HHZgd26D:0:0:/
The encrypted passwords in the provided passwd file are only valid if the TEA key is set to: 012345678 9abcdef0 012345678 9abcdef0. Changes to either the key or the password word will require regeneration of the nsh_romfimg.h header file.
The format of the password file is:
user:x:uid:gid:home
Where: user: User name x: Encrypted password uid: User ID (0 for now) gid: Group ID (0 for now) home: Login directory (/ for now)
/etc/group is a group file. It is not currently used.
nsh> cat /etc/group
root:*:0:root,admin
The format of the group file is:
group:x:gid:users
Where: group: The group name x: Group password gid: Group ID users: A comma separated list of members of the group
Updating the ROMFS File System
The content on the nsh_romfsimg.h header file is generated from a sample directory structure. That directory structure is contained in the etc/ directory and can be modified per the following steps:
1. Change directory to etc/:
cd etc/
2. Make modifications as desired.
3. Create the new ROMFS image.
genromfs -f romfs_img -d etc -V SimEtcVol
4. Convert the ROMFS image to a C header file
xxd -i romfs_img >nsh_romfsimg.h
5. Edit nsh_romfsimg.h, mark both data definitions as 'const' so that
that will be stored in FLASH.