[BusyBox] off topic: 'device table support' for mkcramfs?

Fri May 3 13:09:03 UTC 2002

On Fri, May 03, 2002 at 08:50:09PM +0200, Jonas Holmberg wrote:
> I didn't think of that. It seems like a good idea to use both 
> implementations and the ability to convert between them. It was probably 

Can't see the advantage to both, but both flags could certainly co-exist.

> not that easy for Erik to implement device tables in mkfs.jff2 since he 
> had to rewrite it and I know that it was simple to add metafiles-support 

I didn't study it previous to rewrite... but I suspect mkfs.jffs2
needed an overhaul, and no doubt is much better for Erik's TLC.

> I haven't examined the device_tables in a long time. Does it do all the 
> include-, ignore-, userid- and groupid-stuff yet? In that case it 
> shouldn't be any problem using it for us I think (we have to write a 

Well "ignore-" happens by default with device_table.
I'm no expert, but the other capabilities appear to be there.

Geoff
-- 
Geoffrey Espin
espin at idiom.com

-- Here is Erik's doc & device_table.txt all in file.  Tight! --

# This is a sample device table file for use with mkfs.jffs2.  You can
# do all sorts of interesting things with a device table file.  For
# example, if you want to adjust the permissions on a particular file
# you can just add an entry like:
#   /sbin/foobar	f	2755	0	0	-	-	-	-	-
# and (assuming the file /sbin/foobar exists) it will be made setuid
# root (regardless of what its permissions are on the host filesystem.
# 
# Device table entries take the form of:
# <name>		<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
# where name is the file name,  type can be one of: 
#	f	A regular file
#	d	Directory
#	c	Character special device file
#	b	Block special device file
#	p	Fifo (named pipe)
# uid is the user id for the target file, gid is the group id for the
# target file.  The rest of the entried apply only to device special
# file.

# When building a target filesystem, it is desirable to not have to
# become root and then run 'mknod' a thousand times.  Using a device 
# table you can create device nodes and directories "on the fly".
# Furthermore, you can use a single table entry to create a many device
# minors.  For example, if I wanted to create /boot/var/dev/hda and /dev/hda[0-15]
# I could just use the following two table entries:
#   /boot/var/dev/hda	b	640	0	0	3	0	0	0	-
#   /boot/var/dev/hda	b	640	0	0	3	1	1	1	16
#
# Have fun
# -Erik Andersen <andersen at codepoet.org>
#

#<name>			<type>	<mode>	<uid>	<gid>	<major>	<minor>	<start>	<inc>	<count>
/bin/tinylogin		f	4755	0	0	-	-	-	-	-
/etc/shadow		f	600	0	0	-	-	-	-	-
/etc/shadow		f	600	0	0	-	-	-	-	-
/usr/share/udhcpc/default.script		f	755	0	0	-	-	-	-	-
/home/default		d	2755	1000	1000	-	-	-	-	-
/boot/var/tmp		d	1777	0	0	-	-	-	-	-
/boot/var/dev		d	755	0	0	-	-	-	-	-
/boot/var/dev/pts	d	755	0	0	-	-	-	-	-
/boot/var/dev/ptmx	c	666	0	0	5	2	-	-	-
/boot/var/dev/mem	c	640	0	0	1	1	-	-	-
/boot/var/dev/kmem	c	640	0	0	1	2	-	-	-
/boot/var/dev/null	c	640	0	0	1	3	-	-	-
/boot/var/dev/zero	c	640	0	0	1	5	-	-	-
/boot/var/dev/random	c	640	0	0	1	8	-	-	-
/boot/var/dev/urandom	c	640	0	0	1	9	-	-	-
/boot/var/dev/ram	b	640	0	0	1	1	-	-	-
/boot/var/dev/ram	b	640	0	0	1	0	0	1	4
/boot/var/dev/loop	b	640	0	0	7	0	0	1	2
/boot/var/dev/console	c	640	0	0	5	1	-	-	-
/boot/var/dev/tty	c	640	0	0	5	0	-	-	-
/boot/var/dev/tty	c	640	0	0	4	0	0	1	8
/boot/var/dev/ttyp	c	640	0	0	3	0	0	1	10
/boot/var/dev/ptyp      c       640     0       0       2       0       0       1       10
/boot/var/dev/ttyP	c	640	0	0	57	0	0	1	4
/boot/var/dev/ttySA	c	640	0	0	204	5	0	1	3
/boot/var/dev/ppp	c	640	0	0	108	0	-	-	-
/boot/var/dev/ucb1x00-ts	c	640	0	0	10	14	-	-	-
/boot/var/dev/wheaties	c	640	0	0	60	0	-	-	-
/boot/var/dev/audio	c	640	0	29	14	4	-	-	-
/boot/var/dev/audio1	c	640	0	29	14	20	-	-	-
/boot/var/dev/dsp	c	640	0	29	14	3	-	-	-
/boot/var/dev/dsp1	c	640	0	29	14	19	-	-	-
/boot/var/dev/sndstat	c	640	0	29	14	6	-	-	-

/boot/var/dev/fb	c	640	0	5	29	0	0	32	4
/boot/var/dev/mtd	c	640	0	0	90	0	0	2	4
/boot/var/dev/mtdblock	b	640	0	0	31	0	0	1	4

/boot/var/dev/rtc	c	640	0	0	10	135	-	-	-
#
#
#/boot/var/dev/psaux	c	640	0	0	10	1	-	-	-
#/boot/var/dev/fd	b	640	0	0	2	0	0	0	1
#
# IDE Devices
/boot/var/dev/hda	b	640	0	0	3	0	-	-	-
/boot/var/dev/hda	b	640	0	0	3	1	1	1	4
/boot/var/dev/hdb	b	640	0	0	3	64	-	-	-
/boot/var/dev/hdb	b	640	0	0	3	65	1	1	4
#/boot/var/dev/hdc	b	640	0	0	22	0	-	-	-
#/boot/var/dev/hdc	b	640	0	0	22	1	1	1	1
#/boot/var/dev/hdd	b	640	0	0	22	64	-	-	-
#/boot/var/dev/hdd	b	640	0	0	22	65	1	1	1
# SCSI Devices
#/boot/var/dev/sda	b	640	0	0	8	0	-	-	-
#/boot/var/dev/sda	b	640	0	0	8	1	1	1	1
#/boot/var/dev/sdb	b	640	0	0	8	16	-	-	-
#/boot/var/dev/sdb	b	640	0	0	8	17	1	1	1
#/boot/var/dev/sdc	b	640	0	0	8	32	-	-	-
#/boot/var/dev/sdc	b	640	0	0	8	33	1	1	1
#/boot/var/dev/sdd	b	640	0	0	8	48	-	-	-