[Bug 1195504] Re: Add a noswap option to avoid accessing drives - w/ PATCH

[Lucas Magasweran]

** Patch added: "noswap kernel parameter patch"
   https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1195504/+attachment/3716471/+files/noswap.patch

** Description changed:

- I would like to propose the following patch that adds a "noswap" Kernel
+ I would like to propose the attached patch that adds a "noswap" Kernel
  parameter that disables casper's automatic discovery and activation of
  any present swap partitions. The purpose is to not have the drives and
  drivers in use so that they can be accessed or unloaded without issue.
- 
- === modified file 'debian/manpage/casper.7'
- --- old/debian/manpage/casper.7	2010-11-29 12:49:36 +0000
- +++ new/debian/manpage/casper.7	2013-06-27 22:21:58 +0000
- @@ -88,6 +88,11 @@
-  .TP
-  .BI noprompt
-  Do not prompt to eject the CD on reboot.
- +.TP
- +.BI noswap
- +Adding this parameter, casper will not attempt to find and activate swap partitions requiring manual use of 
- +.B swapon
- +as needed. This is useful to avoid accessing drives that may be present in the system.
-  
-  .SH FILES
-  .B /etc/casper.conf
- 
- === modified file 'scripts/casper'
- --- old/scripts/casper	2013-05-28 10:19:04 +0000
- +++ new/scripts/casper	2013-06-27 22:23:14 +0000
- @@ -71,6 +71,8 @@
-                  export CMD_USERFULLNAME="${x#userfullname=}" ;;
-              username=*)
-                  export CMD_USERNAME="${x#username=}" ;;
- +            noswap)
- +                export DISABLE_SWAP="Yes" ;;
-          esac
-      done
-      if [ "${UNIONFS}" = "" ]; then
- 
- === modified file 'scripts/casper-bottom/13swap'
- --- old/scripts/casper-bottom/13swap	2013-03-13 14:24:28 +0000
- +++ new/scripts/casper-bottom/13swap	2013-06-27 22:23:36 +0000
- @@ -22,25 +22,29 @@
-  log_begin_msg "$DESCRIPTION"
-  
-  devices=""
- -for device in /dev/[hsv]d[a-z][0-9]*; do
- -    if ! [ -b "$device" ]; then
- -        continue
- -    fi
- -
- -    /sbin/blkid -o udev -p ${device%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
- -
- -    magic=$(/bin/dd if="$device" bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null) || continue
- -    
- -    if [ "$magic" = "SWAPSPACE2" -o "$magic" = "SWAP-SPACE" ]; then
- -#        log "Found $device"
- -        devices="$devices $device"
- +if [[ -n "$DISABLE_SWAP" ]]; then
- +    echo -n "disabled via kernel cmdline: noswap."
- +else
- +    for device in /dev/[hsv]d[a-z][0-9]*; do
- +        if ! [ -b "$device" ]; then
- +            continue
-          fi
- -done
- -
- -for device in $devices; do
- -    cat >> $FSTAB <<EOF
- +
- +        /sbin/blkid -o udev -p ${device%%[0-9]*} | grep -q "^ID_FS_USAGE=raid" && continue
- +
- +        magic=$(/bin/dd if="$device" bs=4086 skip=1 count=1 2>/dev/null | /bin/dd bs=10 count=1 2>/dev/null) || continue
- +        
- +        if [ "$magic" = "SWAPSPACE2" -o "$magic" = "SWAP-SPACE" ]; then
- +#            log "Found $device"
- +            devices="$devices $device"
- +            fi
- +    done
- +
- +    for device in $devices; do
- +        cat >> $FSTAB <<EOF
-  $device swap swap defaults 0 0
-  EOF
- -done
- +    done
- +fi
-  
-  log_end_msg

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https://bugs.launchpad.net/bugs/1195504

Title:
  Add a noswap option to avoid accessing drives - w/ PATCH

Status in “casper” package in Ubuntu:
  New

Bug description:
  I would like to propose the attached patch that adds a "noswap" Kernel
  parameter that disables casper's automatic discovery and activation of
  any present swap partitions. The purpose is to not have the drives and
  drivers in use so that they can be accessed or unloaded without issue.

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