/dev/live, /mnt/live, LiveOS/home.img unavailable in Fedora-17

[Frederick Grose]

Please note that the current Fedora-17-Beta-TC2-Live images lack
some traditional Live CD/USB features.

See this bug report.
https://bugzilla.redhat.com/show_bug.cgi?id=740280

/dev/live was a link to the installation partition on the Live USB, such as
/dev/sdc1,
or /dev/sr0 on a Live CD/DVD.

How would a script determine this partition without human input?

/mnt/live was a convenient mounting of the installation partition
filesystem.
It allowed easy access to pre-existing content on the Live USB device or to
the /LiveOS and /syslinux directories.

The --home-size-mb NNN option of livecd-iso-to-disk produced a
/LiveOS/home.img
filesystem for the liveuser's home directory.

This feature made possible the --encrypted-home option, which would secure
the privacy of a user directory on a Live USB system.

The home.img filesystem was also read/write/delete without consuming the
LiveOS overlay.  This is important for non-short-term Live USB deployments,
such as Sugar on a Stick, where overlay exhaustion can be a significant
problem.

Is there a workaround for these (missing) features?

       --Fred

[Frederick Grose]

On Mon, Mar 26, 2012 at 12:02 PM, Frederick Grose <fgrose(a)gmail.com&gt; wrote:

>  Please note that the current Fedora-17-Beta-TC2-Live images lack
>  some traditional Live CD/USB features.
>
>  See this bug report.
>  https://bugzilla.redhat.com/show_bug.cgi?id=740280
>
>  /dev/live was a link to the installation partition on the Live USB, such
>  as /dev/sdc1,
>  or /dev/sr0 on a Live CD/DVD.
>
>  How would a script determine this partition without human input?
>
>  /mnt/live was a convenient mounting of the installation partition
>  filesystem.
>  It allowed easy access to pre-existing content on the Live USB device or to
>  the /LiveOS and /syslinux directories.
>
>  The --home-size-mb NNN option of livecd-iso-to-disk produced a
>  /LiveOS/home.img
>  filesystem for the liveuser's home directory.
>
>  This feature made possible the --encrypted-home option, which would secure
>  the privacy of a user directory on a Live USB system.
>
>  The home.img filesystem was also read/write/delete without consuming the
>  LiveOS overlay.  This is important for non-short-term Live USB deployments,
>  such as Sugar on a Stick, where overlay exhaustion can be a significant
>  problem.
>
>  Is there a workaround for these (missing) features?
>
>         --Fred
>  
This patch restores the lost features:

commit 1580cddaea504efd68c5e10fee70e09d7e81d86b
Author: Frederick Grose <fgrose(a)sugarlabs.org&gt;
Date:   Thu Mar 29 16:27:30 2012 -0400

    Mount live device on /mnt/live, link it to /dev/live

    This enables the mounting of /LiveOS/home.img, if present.

diff --git a/fedora-live-base.ks b/fedora-live-base.ks
index 0b14fec..0cf0fb2 100644
--- a/fedora-live-base.ks
+++ b/fedora-live-base.ks
@@ -88,10 +88,22 @@ touch /.liveimg-configured
 # Make sure we don't mangle the hardware clock on shutdown
 ln -sf /dev/null /etc/systemd/system/hwclock-save.service

+findmount() {
+    local info=()
+    while read -a info; do
+        if [[ ${info[4]} == $1 ]]; then
+            echo ${info[8]}
+            break;
+        fi
+        done < /proc/self/mountinfo
+}
+
 # mount live image
-if [ -b \`readlink -f /dev/live\` ]; then
+livedev=$(findmount /run/initramfs/live)
+if [[ -b $livedev ]]; then
    mkdir -p /mnt/live
-   mount -o ro /dev/live /mnt/live 2>/dev/null || mount /dev/live /mnt/live
+   mount -o ro $livedev /mnt/live 2>/dev/null || mount $livedev /mnt/live
+   ln -s $livedev /dev/live
 fi

 livedir="LiveOS"
@@ -220,7 +232,7 @@ if strstr "\`cat /proc/cmdline\`" CDLABEL= ; then
 # io errors due to not being able to get files...
 #cat /sbin/halt > /dev/null
 #cat /sbin/reboot > /dev/null
-#/usr/sbin/eject -p -m \$(readlink -f /dev/live) >/dev/null 2>&1
+#/usr/sbin/eject -p -m \$livedev >/dev/null 2>&1
 #echo "Please remove the CD from your drive and press Enter to finish
restarting"
 #read -t 30 < /dev/console
 FOE

[Frederick Grose]

On Thu, Mar 29, 2012 at 8:51 PM, Frederick Grose <fgrose(a)gmail.com&gt; wrote:

>  On Mon, Mar 26, 2012 at 12:02 PM, Frederick Grose
> <fgrose(a)gmail.com&gt;wrote:
>
> > Please note that the current Fedora-17-Beta-TC2-Live images lack
> > some traditional Live CD/USB features.
> >
> > See this bug report.
> > https://bugzilla.redhat.com/show_bug.cgi?id=740280
> >
> > /dev/live was a link to the installation partition on the Live USB, such
> > as /dev/sdc1,
> > or /dev/sr0 on a Live CD/DVD.
> >
> > How would a script determine this partition without human input?
> >
> > /mnt/live was a convenient mounting of the installation partition
> > filesystem.
> > It allowed easy access to pre-existing content on the Live USB device or
> > to
> > the /LiveOS and /syslinux directories.
> >
> > The --home-size-mb NNN option of livecd-iso-to-disk produced a
> > /LiveOS/home.img
> > filesystem for the liveuser's home directory.
> >
> > This feature made possible the --encrypted-home option, which would
> > secure the privacy of a user directory on a Live USB system.
> >
> > The home.img filesystem was also read/write/delete without consuming the
> > LiveOS overlay.  This is important for non-short-term Live USB deployments,
> > such as Sugar on a Stick, where overlay exhaustion can be a significant
> > problem.
> >
> > Is there a workaround for these (missing) features?
> >
> >        --Fred
> >
>
>  This patch restores the lost features:
>
>  commit 1580cddaea504efd68c5e10fee70e09d7e81d86b
>  Author: Frederick Grose <fgrose(a)sugarlabs.org&gt;
>  Date:   Thu Mar 29 16:27:30 2012 -0400
>
>      Mount live device on /mnt/live, link it to /dev/live
>
>      This enables the mounting of /LiveOS/home.img, if present.
>
>  diff --git a/fedora-live-base.ks b/fedora-live-base.ks
>  index 0b14fec..0cf0fb2 100644
>  --- a/fedora-live-base.ks
>  +++ b/fedora-live-base.ks
>  @@ -88,10 +88,22 @@ touch /.liveimg-configured
>   # Make sure we don't mangle the hardware clock on shutdown
>   ln -sf /dev/null /etc/systemd/system/hwclock-save.service
>
>  +findmount() {
>  +    local info=()
>  +    while read -a info; do
>  +        if [[ ${info[4]} == $1 ]]; then
>  +            echo ${info[8]}
>  +            break;
>  +        fi
>  +        done < /proc/self/mountinfo
>  +}
>  +
>   # mount live image
>  -if [ -b \`readlink -f /dev/live\` ]; then
>  +livedev=$(findmount /run/initramfs/live)
>  +if [[ -b $livedev ]]; then
>      mkdir -p /mnt/live
>  -   mount -o ro /dev/live /mnt/live 2>/dev/null || mount /dev/live
>  /mnt/live
>  +   mount -o ro $livedev /mnt/live 2>/dev/null || mount $livedev /mnt/live
>  +   ln -s $livedev /dev/live
>   fi
>
>   livedir="LiveOS"
>  @@ -220,7 +232,7 @@ if strstr "\`cat /proc/cmdline\`" CDLABEL= ; then
>   # io errors due to not being able to get files...
>   #cat /sbin/halt > /dev/null
>   #cat /sbin/reboot > /dev/null
>  -#/usr/sbin/eject -p -m \$(readlink -f /dev/live) >/dev/null 2>&1
>  +#/usr/sbin/eject -p -m \$livedev >/dev/null 2>&1
>   #echo "Please remove the CD from your drive and press Enter to finish
>  restarting"
>   #read -t 30 < /dev/console
>   FOE
>  
With Fedora-17.TC2-x86_64-Live-Desktop.iso we have
/run/initramfs/livedev as a symlink to the block device for the source
partition &
/run/initramfs/live as the mount point for that filesystem.

This substitute patch enables the mounting of home.img and swap.img filesystems
with the substitute paths:

(Tested as applied to /etc/rc.d/init.d/livesys on an installed Live USB.)


commit e2a04b06093fcea1b0c6ecfc59847adc08d08137
Author: Frederick Grose <fgrose(a)sugarlabs.org&gt;
Date:   Mon Apr 30 00:03:02 2012 -0400

    Substitute /run/initramfs/live for /mnt/live.

    This is needed to enable mounting of home.img and swap.img in
    Fedora 17 LiveOS installations.

diff --git a/fedora-live-base.ks b/fedora-live-base.ks
index 0b14fec..54df915 100644
--- a/fedora-live-base.ks
+++ b/fedora-live-base.ks
@@ -88,12 +88,6 @@ touch /.liveimg-configured
 # Make sure we don't mangle the hardware clock on shutdown
 ln -sf /dev/null /etc/systemd/system/hwclock-save.service

-# mount live image
-if [ -b \`readlink -f /dev/live\` ]; then
-   mkdir -p /mnt/live
-   mount -o ro /dev/live /mnt/live 2>/dev/null || mount /dev/live /mnt/live
-fi
-
 livedir="LiveOS"
 for arg in \`cat /proc/cmdline\` ; do
   if [ "\${arg##live_dir=}" != "\${arg}" ]; then
@@ -109,8 +103,9 @@ if ! strstr "\`cat /proc/cmdline\`" noswap && [ -n
"\$swaps" ] ; then
     action "Enabling swap partition \$s" swapon \$s
   done
 fi
-if ! strstr "\`cat /proc/cmdline\`" noswap && [ -f
/mnt/live/\${livedir}/swap.img ] ; then
-  action "Enabling swap file" swapon /mnt/live/\${livedir}/swap.img
+if ! strstr "$(cat /proc/cmdline)" noswap &&
+    [[ -f /run/initramfs/live/${livedir}/swap.img ]] ; then
+  action "Enabling swap file" swapon
/run/initramfs/live/${livedir}/swap.img
 fi

 mountPersistentHome() {
@@ -125,8 +120,8 @@ mountPersistentHome() {
     mountopts="-t jffs2"
   elif [ ! -b "\$homedev" ]; then
     loopdev=\`losetup -f\`
-    if [ "\${homedev##/mnt/live}" != "\${homedev}" ]; then
-      action "Remounting live store r/w" mount -o remount,rw /mnt/live
+    if [[ ${homedev##/run/initramfs/live} != ${homedev} ]]; then
+      action "Remounting live store r/w" mount -o remount,rw
/run/initramfs/live
     fi
     losetup \$loopdev \$homedev
     homedev=\$loopdev
@@ -160,8 +155,8 @@ findPersistentHome() {

 if strstr "\`cat /proc/cmdline\`" persistenthome= ; then
   findPersistentHome
-elif [ -e /mnt/live/\${livedir}/home.img ]; then
-  homedev=/mnt/live/\${livedir}/home.img
+elif [[ -e /run/initramfs/live/${livedir}/home.img ]]; then
+  homedev=/run/initramfs/live/${livedir}/home.img
 fi

 # if we have a persistent /home, then we want to go ahead and mount it
@@ -220,7 +215,7 @@ if strstr "\`cat /proc/cmdline\`" CDLABEL= ; then
 # io errors due to not being able to get files...
 #cat /sbin/halt > /dev/null
 #cat /sbin/reboot > /dev/null
-#/usr/sbin/eject -p -m \$(readlink -f /dev/live) >/dev/null 2>&1
+#/usr/sbin/eject -p -m \$(readlink -f /run/initramfs/livedev) >/dev/null
2>&1
 #echo "Please remove the CD from your drive and press Enter to finish
restarting"
 #read -t 30 < /dev/console
 FOE

[Frederick Grose]

On Mon, Apr 30, 2012 at 12:32 AM, Frederick Grose <fgrose(a)gmail.com&gt; wrote:

>  On Thu, Mar 29, 2012 at 8:51 PM, Frederick Grose
> <fgrose(a)gmail.com&gt; wrote:
>
> > On Mon, Mar 26, 2012 at 12:02 PM, Frederick Grose <fgrose(a)gmail.com&gt;wrote:
> >
> >> Please note that the current Fedora-17-Beta-TC2-Live images lack
> >> some traditional Live CD/USB features.
> >>
> >> See this bug report.
> >> https://bugzilla.redhat.com/show_bug.cgi?id=740280
> >>
> >> {...}
> >>
> > 
The --home-size-mb NNN option of livecd-iso-to-disk produced a
> >> /LiveOS/home.img
> >> filesystem for the liveuser's home directory.
> >>
> >> This feature made possible the --encrypted-home option, which would
> >> secure the privacy of a user directory on a Live USB system.
> >>
> >> The home.img filesystem was also read/write/delete without consuming the
> >> LiveOS overlay.  This is important for non-short-term Live USB deployments,
> >> such as Sugar on a Stick, where overlay exhaustion can be a significant
> >> problem.
> >>
> > 
>   {...}
> >>
> > 
Adam Williamson has patched fedora-live-base.ks, but
testingFedora-17.TC5-x86_64-Live-SoaS.iso
shows that a home.img filesystem is not mounted.

Adam's patches need to be applied to fedora-live-mini.ks in order to fix Sugar
on a Stick and any other builds based on fedora-live-mini.ks

Comment added to bug:
https://bugzilla.redhat.com/show_bug.cgi?id=740280#c47

         --Fred