Patchwork [1/1] initscripts: improve the way initscripts handle volatile storage

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Submitter Qi.Chen@windriver.com
Date Nov. 12, 2012, 11:33 a.m.
Message ID <6a877019d44db98a110eafd29d66010ac22fae5a.1352714690.git.Qi.Chen@windriver.com>
Download mbox | patch
Permalink /patch/38859/
State New
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Comments

Qi.Chen@windriver.com - Nov. 12, 2012, 11:33 a.m.
From: Chen Qi <Qi.Chen@windriver.com>

Change the way how populate_volatile.sh handles link-type config
items. Previously, if a link-type config item is encountered, the
script does not handle it correctly. If the target exists as a link,
the config item is skipped no matter where the target actually points.
If the target exists as a file or a directory, it does nothing.
This behavious is sometimes confusing; for example, if /run has been
created by other recipes, it will not be updated to a symlink as the
config file states.

This patch makes populate_volatile.sh do things as the config file
tells it. As for link-type config items, it creates them properly
with an effort to avoid data loss.

Besides, it's not appropriate to divide volatile storage handling
into two files. Operations for /tmp directory in bootmisc.sh should
also be done by populate_volatile.sh.

[YOCTO #3404]

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
---
 .../initscripts/initscripts-1.0/bootmisc.sh        |    7 -----
 .../initscripts-1.0/populate-volatile.sh           |   28 +++++++++-----------
 .../initscripts/initscripts-1.0/volatiles          |    1 +
 meta/recipes-core/initscripts/initscripts_1.0.bb   |    2 +-
 4 files changed, 15 insertions(+), 23 deletions(-)
Saul Wold - Nov. 13, 2012, 11:14 p.m.
On 11/12/2012 03:33 AM, Qi.Chen@windriver.com wrote:
> From: Chen Qi <Qi.Chen@windriver.com>
>
> Change the way how populate_volatile.sh handles link-type config
> items. Previously, if a link-type config item is encountered, the
> script does not handle it correctly. If the target exists as a link,
> the config item is skipped no matter where the target actually points.
> If the target exists as a file or a directory, it does nothing.
> This behavious is sometimes confusing; for example, if /run has been
> created by other recipes, it will not be updated to a symlink as the
> config file states.
>
> This patch makes populate_volatile.sh do things as the config file
> tells it. As for link-type config items, it creates them properly
> with an effort to avoid data loss.
>
> Besides, it's not appropriate to divide volatile storage handling
> into two files. Operations for /tmp directory in bootmisc.sh should
> also be done by populate_volatile.sh.
>
> [YOCTO #3404]
>
> Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
> ---
>   .../initscripts/initscripts-1.0/bootmisc.sh        |    7 -----
>   .../initscripts-1.0/populate-volatile.sh           |   28 +++++++++-----------
>   .../initscripts/initscripts-1.0/volatiles          |    1 +
>   meta/recipes-core/initscripts/initscripts_1.0.bb   |    2 +-
>   4 files changed, 15 insertions(+), 23 deletions(-)
>
> diff --git a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
> index 4f76cb4..80f7ead 100755
> --- a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
> +++ b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
> @@ -54,13 +54,6 @@ fi
>
>   #
>   # This is as good a place as any for a sanity check
> -# /tmp should be a symlink to /var/tmp to cut down on the number
> -# of mounted ramdisks.
> -if test ! -L /tmp && test -d /var/tmp
> -then
> -	rm -rf /tmp
> -	ln -sf /var/tmp /tmp
> -fi
>
>   # Set the system clock from hardware clock
>   # If the timestamp is more recent than the current time,
> diff --git a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
> index d2175d7..baee2ef 100755
> --- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
> +++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
> @@ -47,15 +47,16 @@ mk_dir() {
>   }
>
>   link_file() {
> -	EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0 2>&1"
> -
> -	test "$VOLATILE_ENABLE_CACHE" = yes && echo "	$EXEC" >> /etc/volatile.cache.build
> -	
> -	[ -e "$2" ] && {
> -	  echo "Cannot create link over existing -${TNAME}-." >&2
> -	} || {
> -	  eval $EXEC &
> -	}
> +	EXEC="
> +	if [ -L \"$2\" ]; then
> +		rm -f \"$2\";
> +	elif [ -d \"$2\" ]; then
> +		cp -rf \"$2/*\" \"$1\";
> +		rm -rf \"$2\";
> +	fi;
> +	ln -sf \"$1\" \"$2\" "
> +        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >> /etc/volatile.
I wonder if we should be testing /etc for writablity here first?  We 
need to make sure we respect the possibility that the root filesystem 
with read-only.

Sau!

> +        eval $EXEC &
>   }
>
>   check_requirements() {
> @@ -119,20 +120,17 @@ apply_cfgfile() {
>       return 1
>       }
>
> -  cat ${CFGFILE} | grep -v "^#" | \
> +  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
>     while read LINE; do
>
>       eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\ \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5 TLTARGET=\6/p"`
>
>       [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
>
> -
>       [ "${TTYPE}" = "l" ] && {
>         TSOURCE="$TLTARGET"
> -      [ -L "${TNAME}" ] || {
> -        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- pointing to -${TSOURCE}-."
> -        link_file "${TSOURCE}" "${TNAME}" &
> -        }
> +      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- pointing to -${TSOURCE}-."
> +      link_file "${TSOURCE}" "${TNAME}" &
>         continue
>         }
>
> diff --git a/meta/recipes-core/initscripts/initscripts-1.0/volatiles b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
> index e0741aa..f7e2ef7 100644
> --- a/meta/recipes-core/initscripts/initscripts-1.0/volatiles
> +++ b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
> @@ -31,6 +31,7 @@ l root root 1777 /var/lock /var/volatile/lock
>   l root root 0755 /var/log /var/volatile/log
>   l root root 0755 /var/run /var/volatile/run
>   l root root 1777 /var/tmp /var/volatile/tmp
> +l root root 1777 /tmp /var/tmp
>   d root root 0755 /var/lock/subsys none
>   f root root 0664 /var/log/wtmp none
>   f root root 0664 /var/run/utmp none
> diff --git a/meta/recipes-core/initscripts/initscripts_1.0.bb b/meta/recipes-core/initscripts/initscripts_1.0.bb
> index d25838b..251dd06 100644
> --- a/meta/recipes-core/initscripts/initscripts_1.0.bb
> +++ b/meta/recipes-core/initscripts/initscripts_1.0.bb
> @@ -3,7 +3,7 @@ DESCRIPTION = "Initscripts provide the basic system startup initialization scrip
>   SECTION = "base"
>   LICENSE = "GPLv2"
>   LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
> -PR = "r137"
> +PR = "r138"
>
>   INHIBIT_DEFAULT_DEPS = "1"
>
>
Otavio Salvador - Nov. 14, 2012, 1:34 a.m.
On Tue, Nov 13, 2012 at 9:14 PM, Saul Wold <sgw@linux.intel.com> wrote:

> On 11/12/2012 03:33 AM, Qi.Chen@windriver.com wrote:
>
>> From: Chen Qi <Qi.Chen@windriver.com>
>>
>> Change the way how populate_volatile.sh handles link-type config
>> items. Previously, if a link-type config item is encountered, the
>> script does not handle it correctly. If the target exists as a link,
>> the config item is skipped no matter where the target actually points.
>> If the target exists as a file or a directory, it does nothing.
>> This behavious is sometimes confusing; for example, if /run has been
>> created by other recipes, it will not be updated to a symlink as the
>> config file states.
>>
>> This patch makes populate_volatile.sh do things as the config file
>> tells it. As for link-type config items, it creates them properly
>> with an effort to avoid data loss.
>>
>> Besides, it's not appropriate to divide volatile storage handling
>> into two files. Operations for /tmp directory in bootmisc.sh should
>> also be done by populate_volatile.sh.
>>
>> [YOCTO #3404]
>>
>> Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
>> ---
>>   .../initscripts/initscripts-1.**0/bootmisc.sh        |    7 -----
>>   .../initscripts-1.0/populate-**volatile.sh           |   28
>> +++++++++-----------
>>   .../initscripts/initscripts-1.**0/volatiles          |    1 +
>>   meta/recipes-core/initscripts/**initscripts_1.0.bb<http://initscripts_1.0.bb>  |    2 +-
>>   4 files changed, 15 insertions(+), 23 deletions(-)
>>
>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>> b/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>> index 4f76cb4..80f7ead 100755
>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>> @@ -54,13 +54,6 @@ fi
>>
>>   #
>>   # This is as good a place as any for a sanity check
>> -# /tmp should be a symlink to /var/tmp to cut down on the number
>> -# of mounted ramdisks.
>> -if test ! -L /tmp && test -d /var/tmp
>> -then
>> -       rm -rf /tmp
>> -       ln -sf /var/tmp /tmp
>> -fi
>>
>>   # Set the system clock from hardware clock
>>   # If the timestamp is more recent than the current time,
>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**populate-volatile.sh
>> b/meta/recipes-core/**initscripts/initscripts-1.0/**populate-volatile.sh
>> index d2175d7..baee2ef 100755
>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**
>> populate-volatile.sh
>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**
>> populate-volatile.sh
>> @@ -47,15 +47,16 @@ mk_dir() {
>>   }
>>
>>   link_file() {
>> -       EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0
>> 2>&1"
>> -
>> -       test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >>
>> /etc/volatile.cache.build
>> -
>> -       [ -e "$2" ] && {
>> -         echo "Cannot create link over existing -${TNAME}-." >&2
>> -       } || {
>> -         eval $EXEC &
>> -       }
>> +       EXEC="
>> +       if [ -L \"$2\" ]; then
>> +               rm -f \"$2\";
>> +       elif [ -d \"$2\" ]; then
>> +               cp -rf \"$2/*\" \"$1\";
>> +               rm -rf \"$2\";
>> +       fi;
>> +       ln -sf \"$1\" \"$2\" "
>> +        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >>
>> /etc/volatile.
>>
> I wonder if we should be testing /etc for writablity here first?  We need
> to make sure we respect the possibility that the root filesystem with
> read-only.


I'd say we ought to test for it and print an error if the cache is enabled
and etc is not writable.


>  +        eval $EXEC &
>>   }
>>
>>   check_requirements() {
>> @@ -119,20 +120,17 @@ apply_cfgfile() {
>>       return 1
>>       }
>>
>> -  cat ${CFGFILE} | grep -v "^#" | \
>> +  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
>>     while read LINE; do
>>
>>       eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\
>> \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5
>> TLTARGET=\6/p"`
>>
>>       [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
>>
>> -
>>       [ "${TTYPE}" = "l" ] && {
>>         TSOURCE="$TLTARGET"
>> -      [ -L "${TNAME}" ] || {
>> -        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}-
>> pointing to -${TSOURCE}-."
>> -        link_file "${TSOURCE}" "${TNAME}" &
>> -        }
>> +      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}-
>> pointing to -${TSOURCE}-."
>> +      link_file "${TSOURCE}" "${TNAME}" &
>>         continue
>>         }
>>
>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>> b/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>> index e0741aa..f7e2ef7 100644
>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>> @@ -31,6 +31,7 @@ l root root 1777 /var/lock /var/volatile/lock
>>   l root root 0755 /var/log /var/volatile/log
>>   l root root 0755 /var/run /var/volatile/run
>>   l root root 1777 /var/tmp /var/volatile/tmp
>> +l root root 1777 /tmp /var/tmp
>>   d root root 0755 /var/lock/subsys none
>>   f root root 0664 /var/log/wtmp none
>>   f root root 0664 /var/run/utmp none
>> diff --git a/meta/recipes-core/**initscripts/initscripts_1.0.bbb/meta/recipes-core/
>> **initscripts/initscripts_1.0.bb
>> index d25838b..251dd06 100644
>> --- a/meta/recipes-core/**initscripts/initscripts_1.0.bb
>> +++ b/meta/recipes-core/**initscripts/initscripts_1.0.bb
>> @@ -3,7 +3,7 @@ DESCRIPTION = "Initscripts provide the basic system
>> startup initialization scrip
>>   SECTION = "base"
>>   LICENSE = "GPLv2"
>>   LIC_FILES_CHKSUM = "file://COPYING;md5=**751419260aa954499f7abaabaa882b
>> **be"
>> -PR = "r137"
>> +PR = "r138"
>>
>>   INHIBIT_DEFAULT_DEPS = "1"
>>
>>
>>
> ______________________________**_________________
> Openembedded-core mailing list
> Openembedded-core@lists.**openembedded.org<Openembedded-core@lists.openembedded.org>
> http://lists.linuxtogo.org/**cgi-bin/mailman/listinfo/**openembedded-core<http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core>
>
Qi.Chen@windriver.com - Nov. 14, 2012, 7:15 a.m.
On 11/14/2012 07:14 AM, Saul Wold wrote:
> On 11/12/2012 03:33 AM, Qi.Chen@windriver.com wrote:
>> From: Chen Qi <Qi.Chen@windriver.com>
>>
>> Change the way how populate_volatile.sh handles link-type config
>> items. Previously, if a link-type config item is encountered, the
>> script does not handle it correctly. If the target exists as a link,
>> the config item is skipped no matter where the target actually points.
>> If the target exists as a file or a directory, it does nothing.
>> This behavious is sometimes confusing; for example, if /run has been
>> created by other recipes, it will not be updated to a symlink as the
>> config file states.
>>
>> This patch makes populate_volatile.sh do things as the config file
>> tells it. As for link-type config items, it creates them properly
>> with an effort to avoid data loss.
>>
>> Besides, it's not appropriate to divide volatile storage handling
>> into two files. Operations for /tmp directory in bootmisc.sh should
>> also be done by populate_volatile.sh.
>>
>> [YOCTO #3404]
>>
>> Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
>> ---
>>   .../initscripts/initscripts-1.0/bootmisc.sh        |    7 -----
>>   .../initscripts-1.0/populate-volatile.sh           |   28 
>> +++++++++-----------
>>   .../initscripts/initscripts-1.0/volatiles          |    1 +
>>   meta/recipes-core/initscripts/initscripts_1.0.bb   |    2 +-
>>   4 files changed, 15 insertions(+), 23 deletions(-)
>>
>> diff --git 
>> a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh 
>> b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> index 4f76cb4..80f7ead 100755
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> @@ -54,13 +54,6 @@ fi
>>
>>   #
>>   # This is as good a place as any for a sanity check
>> -# /tmp should be a symlink to /var/tmp to cut down on the number
>> -# of mounted ramdisks.
>> -if test ! -L /tmp && test -d /var/tmp
>> -then
>> -    rm -rf /tmp
>> -    ln -sf /var/tmp /tmp
>> -fi
>>
>>   # Set the system clock from hardware clock
>>   # If the timestamp is more recent than the current time,
>> diff --git 
>> a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh 
>> b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> index d2175d7..baee2ef 100755
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> @@ -47,15 +47,16 @@ mk_dir() {
>>   }
>>
>>   link_file() {
>> -    EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0 
>> 2>&1"
>> -
>> -    test "$VOLATILE_ENABLE_CACHE" = yes && echo "    $EXEC" >> 
>> /etc/volatile.cache.build
>> -
>> -    [ -e "$2" ] && {
>> -      echo "Cannot create link over existing -${TNAME}-." >&2
>> -    } || {
>> -      eval $EXEC &
>> -    }
>> +    EXEC="
>> +    if [ -L \"$2\" ]; then
>> +        rm -f \"$2\";
>> +    elif [ -d \"$2\" ]; then
>> +        cp -rf \"$2/*\" \"$1\";
>> +        rm -rf \"$2\";
>> +    fi;
>> +    ln -sf \"$1\" \"$2\" "
>> +        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >> 
>> /etc/volatile.
> I wonder if we should be testing /etc for writablity here first?  We 
> need to make sure we respect the possibility that the root filesystem 
> with read-only.
>
> Sau!
>
>> +        eval $EXEC &
>>   }
>>
>>   check_requirements() {
>> @@ -119,20 +120,17 @@ apply_cfgfile() {
>>       return 1
>>       }
>>
>> -  cat ${CFGFILE} | grep -v "^#" | \
>> +  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
>>     while read LINE; do
>>
>>       eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\ 
>> \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5 
>> TLTARGET=\6/p"`
>>
>>       [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
>>
>> -
>>       [ "${TTYPE}" = "l" ] && {
>>         TSOURCE="$TLTARGET"
>> -      [ -L "${TNAME}" ] || {
>> -        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- 
>> pointing to -${TSOURCE}-."
>> -        link_file "${TSOURCE}" "${TNAME}" &
>> -        }
>> +      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- 
>> pointing to -${TSOURCE}-."
>> +      link_file "${TSOURCE}" "${TNAME}" &
>>         continue
>>         }
>>
>> diff --git a/meta/recipes-core/initscripts/initscripts-1.0/volatiles 
>> b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> index e0741aa..f7e2ef7 100644
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> @@ -31,6 +31,7 @@ l root root 1777 /var/lock /var/volatile/lock
>>   l root root 0755 /var/log /var/volatile/log
>>   l root root 0755 /var/run /var/volatile/run
>>   l root root 1777 /var/tmp /var/volatile/tmp
>> +l root root 1777 /tmp /var/tmp
>>   d root root 0755 /var/lock/subsys none
>>   f root root 0664 /var/log/wtmp none
>>   f root root 0664 /var/run/utmp none
>> diff --git a/meta/recipes-core/initscripts/initscripts_1.0.bb 
>> b/meta/recipes-core/initscripts/initscripts_1.0.bb
>> index d25838b..251dd06 100644
>> --- a/meta/recipes-core/initscripts/initscripts_1.0.bb
>> +++ b/meta/recipes-core/initscripts/initscripts_1.0.bb
>> @@ -3,7 +3,7 @@ DESCRIPTION = "Initscripts provide the basic system 
>> startup initialization scrip
>>   SECTION = "base"
>>   LICENSE = "GPLv2"
>>   LIC_FILES_CHKSUM = 
>> "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
>> -PR = "r137"
>> +PR = "r138"
>>
>>   INHIBIT_DEFAULT_DEPS = "1"
>>
>>
>
Hi Saul:
Good point! I did miss that.
However, after a second thinking, I think we probably don't need to 
change it. Here's my reasons.

1. No matter rootfs is read-only or writable, this script would work 
correctly. This is because it will first check whether 
'/etc/volatile.cache' exists before using it. (Of course,  this is based 
on the assumption that users don't change /etc/volatile.cache manually.)

2. There are some other initscripts that assume rootfs to be writable, 
for example, udev-cache, bootmisc.sh, avahi-daemon, rmnologin.sh, 
save-rtc.sh.   They have 'mkdir', 'cp' or 'mv' operation on /etc without 
checking whether rootfs is read-only.

Cheers,
Chen Qi
Qi.Chen@windriver.com - Nov. 14, 2012, 7:30 a.m.
On 11/14/2012 07:14 AM, Saul Wold wrote:
> On 11/12/2012 03:33 AM, Qi.Chen@windriver.com wrote:
>> From: Chen Qi <Qi.Chen@windriver.com>
>>
>> Change the way how populate_volatile.sh handles link-type config
>> items. Previously, if a link-type config item is encountered, the
>> script does not handle it correctly. If the target exists as a link,
>> the config item is skipped no matter where the target actually points.
>> If the target exists as a file or a directory, it does nothing.
>> This behavious is sometimes confusing; for example, if /run has been
>> created by other recipes, it will not be updated to a symlink as the
>> config file states.
>>
>> This patch makes populate_volatile.sh do things as the config file
>> tells it. As for link-type config items, it creates them properly
>> with an effort to avoid data loss.
>>
>> Besides, it's not appropriate to divide volatile storage handling
>> into two files. Operations for /tmp directory in bootmisc.sh should
>> also be done by populate_volatile.sh.
>>
>> [YOCTO #3404]
>>
>> Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
>> ---
>>   .../initscripts/initscripts-1.0/bootmisc.sh        |    7 -----
>>   .../initscripts-1.0/populate-volatile.sh           |   28 
>> +++++++++-----------
>>   .../initscripts/initscripts-1.0/volatiles          |    1 +
>>   meta/recipes-core/initscripts/initscripts_1.0.bb   |    2 +-
>>   4 files changed, 15 insertions(+), 23 deletions(-)
>>
>> diff --git 
>> a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh 
>> b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> index 4f76cb4..80f7ead 100755
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
>> @@ -54,13 +54,6 @@ fi
>>
>>   #
>>   # This is as good a place as any for a sanity check
>> -# /tmp should be a symlink to /var/tmp to cut down on the number
>> -# of mounted ramdisks.
>> -if test ! -L /tmp && test -d /var/tmp
>> -then
>> -    rm -rf /tmp
>> -    ln -sf /var/tmp /tmp
>> -fi
>>
>>   # Set the system clock from hardware clock
>>   # If the timestamp is more recent than the current time,
>> diff --git 
>> a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh 
>> b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> index d2175d7..baee2ef 100755
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
>> @@ -47,15 +47,16 @@ mk_dir() {
>>   }
>>
>>   link_file() {
>> -    EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0 
>> 2>&1"
>> -
>> -    test "$VOLATILE_ENABLE_CACHE" = yes && echo "    $EXEC" >> 
>> /etc/volatile.cache.build
>> -
>> -    [ -e "$2" ] && {
>> -      echo "Cannot create link over existing -${TNAME}-." >&2
>> -    } || {
>> -      eval $EXEC &
>> -    }
>> +    EXEC="
>> +    if [ -L \"$2\" ]; then
>> +        rm -f \"$2\";
>> +    elif [ -d \"$2\" ]; then
>> +        cp -rf \"$2/*\" \"$1\";
>> +        rm -rf \"$2\";
>> +    fi;
>> +    ln -sf \"$1\" \"$2\" "
>> +        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >> 
>> /etc/volatile.
> I wonder if we should be testing /etc for writablity here first?  We 
> need to make sure we respect the possibility that the root filesystem 
> with read-only.
>
> Sau!
>
>> +        eval $EXEC &
>>   }
>>
>>   check_requirements() {
>> @@ -119,20 +120,17 @@ apply_cfgfile() {
>>       return 1
>>       }
>>
>> -  cat ${CFGFILE} | grep -v "^#" | \
>> +  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
>>     while read LINE; do
>>
>>       eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\ 
>> \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5 
>> TLTARGET=\6/p"`
>>
>>       [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
>>
>> -
>>       [ "${TTYPE}" = "l" ] && {
>>         TSOURCE="$TLTARGET"
>> -      [ -L "${TNAME}" ] || {
>> -        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- 
>> pointing to -${TSOURCE}-."
>> -        link_file "${TSOURCE}" "${TNAME}" &
>> -        }
>> +      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- 
>> pointing to -${TSOURCE}-."
>> +      link_file "${TSOURCE}" "${TNAME}" &
>>         continue
>>         }
>>
>> diff --git a/meta/recipes-core/initscripts/initscripts-1.0/volatiles 
>> b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> index e0741aa..f7e2ef7 100644
>> --- a/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> +++ b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
>> @@ -31,6 +31,7 @@ l root root 1777 /var/lock /var/volatile/lock
>>   l root root 0755 /var/log /var/volatile/log
>>   l root root 0755 /var/run /var/volatile/run
>>   l root root 1777 /var/tmp /var/volatile/tmp
>> +l root root 1777 /tmp /var/tmp
>>   d root root 0755 /var/lock/subsys none
>>   f root root 0664 /var/log/wtmp none
>>   f root root 0664 /var/run/utmp none
>> diff --git a/meta/recipes-core/initscripts/initscripts_1.0.bb 
>> b/meta/recipes-core/initscripts/initscripts_1.0.bb
>> index d25838b..251dd06 100644
>> --- a/meta/recipes-core/initscripts/initscripts_1.0.bb
>> +++ b/meta/recipes-core/initscripts/initscripts_1.0.bb
>> @@ -3,7 +3,7 @@ DESCRIPTION = "Initscripts provide the basic system 
>> startup initialization scrip
>>   SECTION = "base"
>>   LICENSE = "GPLv2"
>>   LIC_FILES_CHKSUM = 
>> "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
>> -PR = "r137"
>> +PR = "r138"
>>
>>   INHIBIT_DEFAULT_DEPS = "1"
>>
>>
>
Hi Saul:

After looking at bug#3406 and bug#3407, I realize that it is much more 
complex than I thought to make this script work on a read-only rootfs. 
After all, if the rootfs is read-only, we cannot delete things like 
/tmp, /var/run and so on.

Besides, as I mentioned in the last email, there are some other 
initscripts that assume rootfs to be writable. So as far as I can see, 
support for read-only rootfs would not be trivial.

Cheers,
Chen Qi
Otavio Salvador - Nov. 14, 2012, 11:18 a.m.
On Wed, Nov 14, 2012 at 5:30 AM, ChenQi <Qi.Chen@windriver.com> wrote:

> On 11/14/2012 07:14 AM, Saul Wold wrote:
>
>> On 11/12/2012 03:33 AM, Qi.Chen@windriver.com wrote:
>>
>>> From: Chen Qi <Qi.Chen@windriver.com>
>>>
>>> Change the way how populate_volatile.sh handles link-type config
>>> items. Previously, if a link-type config item is encountered, the
>>> script does not handle it correctly. If the target exists as a link,
>>> the config item is skipped no matter where the target actually points.
>>> If the target exists as a file or a directory, it does nothing.
>>> This behavious is sometimes confusing; for example, if /run has been
>>> created by other recipes, it will not be updated to a symlink as the
>>> config file states.
>>>
>>> This patch makes populate_volatile.sh do things as the config file
>>> tells it. As for link-type config items, it creates them properly
>>> with an effort to avoid data loss.
>>>
>>> Besides, it's not appropriate to divide volatile storage handling
>>> into two files. Operations for /tmp directory in bootmisc.sh should
>>> also be done by populate_volatile.sh.
>>>
>>> [YOCTO #3404]
>>>
>>> Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
>>> ---
>>>   .../initscripts/initscripts-1.**0/bootmisc.sh        |    7 -----
>>>   .../initscripts-1.0/populate-**volatile.sh           |   28
>>> +++++++++-----------
>>>   .../initscripts/initscripts-1.**0/volatiles          |    1 +
>>>   meta/recipes-core/initscripts/**initscripts_1.0.bb<http://initscripts_1.0.bb>  |    2 +-
>>>   4 files changed, 15 insertions(+), 23 deletions(-)
>>>
>>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>>> b/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>>> index 4f76cb4..80f7ead 100755
>>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**bootmisc.sh
>>> @@ -54,13 +54,6 @@ fi
>>>
>>>   #
>>>   # This is as good a place as any for a sanity check
>>> -# /tmp should be a symlink to /var/tmp to cut down on the number
>>> -# of mounted ramdisks.
>>> -if test ! -L /tmp && test -d /var/tmp
>>> -then
>>> -    rm -rf /tmp
>>> -    ln -sf /var/tmp /tmp
>>> -fi
>>>
>>>   # Set the system clock from hardware clock
>>>   # If the timestamp is more recent than the current time,
>>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**populate-volatile.sh
>>> b/meta/recipes-core/**initscripts/initscripts-1.0/**populate-volatile.sh
>>> index d2175d7..baee2ef 100755
>>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**
>>> populate-volatile.sh
>>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**
>>> populate-volatile.sh
>>> @@ -47,15 +47,16 @@ mk_dir() {
>>>   }
>>>
>>>   link_file() {
>>> -    EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0
>>> 2>&1"
>>> -
>>> -    test "$VOLATILE_ENABLE_CACHE" = yes && echo "    $EXEC" >>
>>> /etc/volatile.cache.build
>>> -
>>> -    [ -e "$2" ] && {
>>> -      echo "Cannot create link over existing -${TNAME}-." >&2
>>> -    } || {
>>> -      eval $EXEC &
>>> -    }
>>> +    EXEC="
>>> +    if [ -L \"$2\" ]; then
>>> +        rm -f \"$2\";
>>> +    elif [ -d \"$2\" ]; then
>>> +        cp -rf \"$2/*\" \"$1\";
>>> +        rm -rf \"$2\";
>>> +    fi;
>>> +    ln -sf \"$1\" \"$2\" "
>>> +        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >>
>>> /etc/volatile.
>>>
>> I wonder if we should be testing /etc for writablity here first?  We need
>> to make sure we respect the possibility that the root filesystem with
>> read-only.
>>
>> Sau!
>>
>>  +        eval $EXEC &
>>>   }
>>>
>>>   check_requirements() {
>>> @@ -119,20 +120,17 @@ apply_cfgfile() {
>>>       return 1
>>>       }
>>>
>>> -  cat ${CFGFILE} | grep -v "^#" | \
>>> +  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
>>>     while read LINE; do
>>>
>>>       eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\
>>> \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5
>>> TLTARGET=\6/p"`
>>>
>>>       [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
>>>
>>> -
>>>       [ "${TTYPE}" = "l" ] && {
>>>         TSOURCE="$TLTARGET"
>>> -      [ -L "${TNAME}" ] || {
>>> -        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}-
>>> pointing to -${TSOURCE}-."
>>> -        link_file "${TSOURCE}" "${TNAME}" &
>>> -        }
>>> +      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}-
>>> pointing to -${TSOURCE}-."
>>> +      link_file "${TSOURCE}" "${TNAME}" &
>>>         continue
>>>         }
>>>
>>> diff --git a/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>>> b/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>>> index e0741aa..f7e2ef7 100644
>>> --- a/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>>> +++ b/meta/recipes-core/**initscripts/initscripts-1.0/**volatiles
>>> @@ -31,6 +31,7 @@ l root root 1777 /var/lock /var/volatile/lock
>>>   l root root 0755 /var/log /var/volatile/log
>>>   l root root 0755 /var/run /var/volatile/run
>>>   l root root 1777 /var/tmp /var/volatile/tmp
>>> +l root root 1777 /tmp /var/tmp
>>>   d root root 0755 /var/lock/subsys none
>>>   f root root 0664 /var/log/wtmp none
>>>   f root root 0664 /var/run/utmp none
>>> diff --git a/meta/recipes-core/**initscripts/initscripts_1.0.bbb/meta/recipes-core/
>>> **initscripts/initscripts_1.0.bb
>>> index d25838b..251dd06 100644
>>> --- a/meta/recipes-core/**initscripts/initscripts_1.0.bb
>>> +++ b/meta/recipes-core/**initscripts/initscripts_1.0.bb
>>> @@ -3,7 +3,7 @@ DESCRIPTION = "Initscripts provide the basic system
>>> startup initialization scrip
>>>   SECTION = "base"
>>>   LICENSE = "GPLv2"
>>>   LIC_FILES_CHKSUM = "file://COPYING;md5=**
>>> 751419260aa954499f7abaabaa882b**be"
>>> -PR = "r137"
>>> +PR = "r138"
>>>
>>>   INHIBIT_DEFAULT_DEPS = "1"
>>>
>>>
>>>
>>  Hi Saul:
>
> After looking at bug#3406 and bug#3407, I realize that it is much more
> complex than I thought to make this script work on a read-only rootfs.
> After all, if the rootfs is read-only, we cannot delete things like /tmp,
> /var/run and so on.
>
> Besides, as I mentioned in the last email, there are some other
> initscripts that assume rootfs to be writable. So as far as I can see,
> support for read-only rootfs would not be trivial.
>

I think it ought to ERROR in case it is not writable; and then work on a
fix for it. In fact it doesn't work now so it ought to "document" it during
boot and then a fix for it can be done.

Patch

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
index 4f76cb4..80f7ead 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
+++ b/meta/recipes-core/initscripts/initscripts-1.0/bootmisc.sh
@@ -54,13 +54,6 @@  fi
 
 #
 # This is as good a place as any for a sanity check
-# /tmp should be a symlink to /var/tmp to cut down on the number
-# of mounted ramdisks.
-if test ! -L /tmp && test -d /var/tmp
-then
-	rm -rf /tmp
-	ln -sf /var/tmp /tmp
-fi
 
 # Set the system clock from hardware clock
 # If the timestamp is more recent than the current time,
diff --git a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
index d2175d7..baee2ef 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
+++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
@@ -47,15 +47,16 @@  mk_dir() {
 }
 
 link_file() {
-	EXEC="test -e \"$2\" -o -L $2 || ln -s \"$1\" \"$2\" >/dev/tty0 2>&1" 
-
-	test "$VOLATILE_ENABLE_CACHE" = yes && echo "	$EXEC" >> /etc/volatile.cache.build
-	
-	[ -e "$2" ] && {
-	  echo "Cannot create link over existing -${TNAME}-." >&2
-	} || {
-	  eval $EXEC &
-	}
+	EXEC="
+	if [ -L \"$2\" ]; then
+		rm -f \"$2\";
+	elif [ -d \"$2\" ]; then
+		cp -rf \"$2/*\" \"$1\";
+		rm -rf \"$2\";
+	fi;
+	ln -sf \"$1\" \"$2\" "
+        test "$VOLATILE_ENABLE_CACHE" = yes && echo "   $EXEC" >> /etc/volatile.
+        eval $EXEC &
 }
 
 check_requirements() {
@@ -119,20 +120,17 @@  apply_cfgfile() {
     return 1
     }
 
-  cat ${CFGFILE} | grep -v "^#" | \
+  cat ${CFGFILE} | grep -v "^#" | sed -e '/^$/ d' | \
   while read LINE; do
 
     eval `echo "$LINE" | sed -n "s/\(.*\)\ \(.*\) \(.*\)\ \(.*\)\ \(.*\)\ \(.*\)/TTYPE=\1 ; TUSER=\2; TGROUP=\3; TMODE=\4; TNAME=\5 TLTARGET=\6/p"`
 
     [ "${VERBOSE}" != "no" ] && echo "Checking for -${TNAME}-."
 
-
     [ "${TTYPE}" = "l" ] && {
       TSOURCE="$TLTARGET"
-      [ -L "${TNAME}" ] || {
-        [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- pointing to -${TSOURCE}-."
-        link_file "${TSOURCE}" "${TNAME}" &
-        }
+      [ "${VERBOSE}" != "no" ] && echo "Creating link -${TNAME}- pointing to -${TSOURCE}-."
+      link_file "${TSOURCE}" "${TNAME}" &
       continue
       }
 
diff --git a/meta/recipes-core/initscripts/initscripts-1.0/volatiles b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
index e0741aa..f7e2ef7 100644
--- a/meta/recipes-core/initscripts/initscripts-1.0/volatiles
+++ b/meta/recipes-core/initscripts/initscripts-1.0/volatiles
@@ -31,6 +31,7 @@  l root root 1777 /var/lock /var/volatile/lock
 l root root 0755 /var/log /var/volatile/log
 l root root 0755 /var/run /var/volatile/run
 l root root 1777 /var/tmp /var/volatile/tmp
+l root root 1777 /tmp /var/tmp
 d root root 0755 /var/lock/subsys none
 f root root 0664 /var/log/wtmp none
 f root root 0664 /var/run/utmp none
diff --git a/meta/recipes-core/initscripts/initscripts_1.0.bb b/meta/recipes-core/initscripts/initscripts_1.0.bb
index d25838b..251dd06 100644
--- a/meta/recipes-core/initscripts/initscripts_1.0.bb
+++ b/meta/recipes-core/initscripts/initscripts_1.0.bb
@@ -3,7 +3,7 @@  DESCRIPTION = "Initscripts provide the basic system startup initialization scrip
 SECTION = "base"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=751419260aa954499f7abaabaa882bbe"
-PR = "r137"
+PR = "r138"
 
 INHIBIT_DEFAULT_DEPS = "1"