'Twas brillig, and Harald Hoyer at 24/01/13 11:40 did gyre and gimble:
> Am 23.01.2013 21:15, schrieb Colin Guthrie:
>> Lilo supplies root=900 rather than root=/dev/md0. Similarly it would say root=801 rather
>> than root=/dev/sda1.
>>
>> This patch simply interprets that number and creates appropriate udev rules
>> to create the /dev/root symlink as needed.
>> ---
>> modules.d/95rootfs-block/block-genrules.sh | 11 ++++++++++-
>> modules.d/95rootfs-block/parse-block.sh | 4 ++++
>> 2 files changed, 14 insertions(+), 1 deletion(-)
>>
>> diff --git a/modules.d/95rootfs-block/block-genrules.sh b/modules.d/95rootfs-block/block-genrules.sh
>> index 7f894ee..161183e 100755
>> --- a/modules.d/95rootfs-block/block-genrules.sh
>> +++ b/modules.d/95rootfs-block/block-genrules.sh
>> @@ -2,7 +2,16 @@
>> # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
>> # ex: ts=8 sw=4 sts=4 et filetype=sh
>>
>> -if [ "${root%%:*}" = "block" ]; then
>> +if [ -n "$rootdevnum" ]; then
>> + major=$(( 0x$rootdevnum / 256 ))
>> + minor=$(( 0x$rootdevnum - ( $major * 256 ) ))
>> + {
>> + printf 'ACTION=="add|change", ENV{MAJOR}=="%d", ENV{MINOR}=="%d", SYMLINK+="root"\n' \
>> + $major $minor
>> + } >> /etc/udev/rules.d/99-root.rules
>> +
>> + wait_for_dev /dev/root
>> +elif [ "${root%%:*}" = "block" ]; then
>> {
>> printf 'KERNEL=="%s", SYMLINK+="root"\n' \
>> ${root#block:/dev/}
>> diff --git a/modules.d/95rootfs-block/parse-block.sh b/modules.d/95rootfs-block/parse-block.sh
>> index 3745352..9efc51f 100755
>> --- a/modules.d/95rootfs-block/parse-block.sh
>> +++ b/modules.d/95rootfs-block/parse-block.sh
>> @@ -19,4 +19,8 @@ case "$root" in
>> /dev/*)
>> root="block:${root}"
>> rootok=1 ;;
>> + [1-9][0-9][0-9])
>> + rootdevnum=$root
>> + root=block:/dev/root
>
> I would do just:
>
> major=$(( 0x$root / 256 ))
> minor=$(( 0x$root - ( $major * 256 ) ))
> root=/dev/block/$major:$minor
Hmm, indeed, that does seem simpler :)
Of course this whole scheme is generally stupid anyway (majors have not
been limited to 256 for years), but meh.
Col
--
Colin Guthrie
colin(at)mageia.org
http://colin.guthr.ie/
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