README
======
Overview
--------
This directory contains logic to support a custom ROMFS start-up script.
This startup script is used by by the NSH when it starts provided that
CONFIG_NSH_ARCHROMFS=y. The script provides 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
nsh>
/etc/init.d/rcS is the start-up script; /etc/passwd is a the password
file. It supports a single user:
USERNAME: admin
PASSWORD: Adminstrator
nsh> cat /etc/passwd
admin:8Tv+Hbmr3pLddSjtzL0kwC: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
/etc/init.d/rcS should have the following contents :
vi rcS
echo "This is NuttX"
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.
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