slaxctl script
TomasM
parent
d0d0b28b84
commit
9df0ace980
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#!/bin/bash
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# Slax management and control script
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# Author: Tomas M <http://www.slax.org/>
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# activate
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# deactivate
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# list
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LIVE=/mnt/live/memory
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# Print error message and exit
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# $1 = error message
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#
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die()
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{
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echo "$1" >&2
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exit 1
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}
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# returns writable directory outside of AUFS root
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# where Slax Bundle can be safely stored
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#
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get_bundle_storage_dir()
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{
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local TGT
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TGT=$LIVE/data/linux/modules
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mkdir -p $TGT 2>/dev/null
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touch $TGT/.empty 2>/dev/null && rm $TGT/.empty 2>/dev/null
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if [ $? -ne 0 ]; then
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TGT=$LIVE/modules
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mkdir -p $TGT
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fi
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echo $TGT
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}
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print_branches()
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{
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local SI BUNDLE LOOP CWD
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SI="/sys/fs/aufs/$(cat /proc/mounts | grep 'aufs / aufs' | egrep -o 'si=([^,) ]+)' | tr = _)"
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CWD="$(pwd)"
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cd "$SI"
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ls -v1 | grep -v xi_path | egrep 'br[0-9]+' | xargs cat | grep memory/bundles | rev | cut -b 4- | rev | while read BUNDLE; do
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if mountpoint -q "$BUNDLE"; then
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LOOP=$(cat /proc/mounts | fgrep " $BUNDLE squashfs" | cut -d " " -f 1)
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echo -n "$BUNDLE"
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echo -ne "\t"
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losetup $LOOP | sed -r "s:.*[(]|[)].*::g"
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fi
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done | tac
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cd "$CWD"
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}
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# Activate Slax Bundle
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# $1 = file to activate
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#
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activate()
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{
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local SB TGT BAS
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SB="$(readlink -f "$1")"
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BAS="$(basename "$SB")"
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# check if file exists
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if [ ! -r "$SB" ]; then
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usage "file not found $SB"
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fi
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# check if file is in aufs union - if yes, move outside
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if [ -r "$LIVE/changes/$SB" ]; then
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TGT="$(get_bundle_storage_dir)"
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echo "File stored inside AUFS filesystem couldn't be activated, moving to $TGT, then activating from there"
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mv -n "$SB" "$TGT/$BAS"
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if [ $? -ne 0 ]; then
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die "Error moving file to $TGT/$BAS. Not enough space or target already exists"
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fi
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SB="$TGT/$BAS"
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fi
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# check if this particular file is already activated
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if print_branches | cut -f 2 | fgrep -q "$SB"; then
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exit
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fi
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# mount remount,add
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TGT="$LIVE/bundles/$BAS"
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mkdir -p "$TGT"
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mount -n -o loop,ro "$SB" "$TGT"
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if [ $? -ne 0 ]; then
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die "Error mounting $SB to $TGT, perhaps corrupted download"
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fi
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# add current branch to aufs union
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mount -t aufs -o remount,add:1:"$TGT" aufs /
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if [ $? -ne 0 ]; then
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umount "$TGT"
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rmdir "$TGT"
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die "Error attaching bundle filesystem to Slax"
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fi
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echo "Slax Bundle activated: $BAS"
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}
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# Deactivate Slax bundle of the given name
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# $1 = path to bundle file, or its name
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#
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deactivate()
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{
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local BUNDLES SB MATCH LOOP LOOPFILE
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BUNDLES=$LIVE/bundles
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MODULES=$LIVE/modules
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SB="$(basename "$1")"
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rmdir "$BUNDLES/$SB" 2>/dev/null # this fails unless the dir is
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rmdir "$BUNDLES/$SB.sb" 2>/dev/null # forgotten there empty. It's safe this way
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if [ ! -d "$BUNDLES/$SB" ]; then
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# we don't have real filename match, lets try to add .sb extension
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if [ ! -d "$BUNDLES/$SB.sb" ]; then
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# no, still no match. Lets use some guesswork
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SB=$(print_branches | cut -f 2 | egrep -o "/[0-9]+-$SB.sb\$" | tail -n 1 | xargs -r basename)
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else
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SB="$SB.sb"
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fi
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fi
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if [ "$SB" = "" -o ! -d "$BUNDLES/$SB" ]; then
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die "can't find active slax bundle $1"
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fi
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echo "Attempting to deactivate Slax bundle $SB..."
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mount -t aufs -o remount,verbose,del:"$BUNDLES/$SB" aufs / 2>/dev/null
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if [ $? -ne 0 ]; then
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die "Unable to deactivate Slax Bundle - still in use. See dmesg for more."
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fi
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# remember what loop device was the bundle mounted to, it may be needed later
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LOOP="$(cat /proc/mounts | fgrep " $BUNDLES/$SB " | cut -d " " -f 1)"
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LOOPFILE="$(losetup "$LOOP" | cut -d " " -f 3 | sed -r 's:^.|.$::g')"
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umount "$BUNDLES/$SB" 2>/dev/null
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if [ $? -ne 0 ]; then
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die "Unable to umount Slax bundle loop-mount $BUNDLES/$SB"
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fi
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rmdir "$BUNDLES/$SB"
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# free the loop device manually since umount fails to do that if the bundle was activated on boot
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losetup -d "$LOOP" 2>/dev/null
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# remove the .sb file, but keep it if deactivate was issued on full sb real path
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if [ "$(realpath "$1")" != "$(realpath "$LOOPFILE")" ]; then
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rm -f "$LOOPFILE"
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fi
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echo "Slax Bundle deactivated: $SB"
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}
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if [ "$1" = "" ]; then
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die "Usage: $0 [ activate | deactivate | list ] [ file.sb ]"
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fi
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if [ "$1" = "activate" ]; then
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activate "$2"
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fi
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if [ "$1" = "deactivate" ]; then
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deactivate "$2"
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fi
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if [ "$1" = "list" ]; then
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print_branches
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fi
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