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base-files: add sysupgrade -o to save all overlay files

Add sysupgrade '-o' option in order to include all overlay files in
backup, except for those that are from packages but including files
listed in conffiles, sysupgrade.conf or /lib/upgrade/keep.d.

With '-u' option, it will skip files equals to /rom and conffiles that
were not changed.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
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luizluca authored and ldir-EDB0 committed Aug 17, 2018
1 parent 20b2327 commit 96392e5da4251454ae5b921754cc35fab1bfce85
Showing with 48 additions and 4 deletions.
  1. +48 −4 package/base-files/files/sbin/sysupgrade
@@ -9,6 +9,7 @@ export INTERACTIVE=0
export VERBOSE=1
export SAVE_CONFIG=1
export SAVE_OVERLAY=0
export SAVE_OVERLAY_PATH=
export SAVE_PARTITIONS=1
export SKIP_UNCHANGED=0
export CONF_IMAGE=
@@ -27,7 +28,8 @@ while [ -n "$1" ]; do
-v) export VERBOSE="$(($VERBOSE + 1))";;
-q) export VERBOSE="$(($VERBOSE - 1))";;
-n) export SAVE_CONFIG=0;;
-c) export SAVE_OVERLAY=1;;
-c) export SAVE_OVERLAY=1 SAVE_OVERLAY_PATH=/etc;;
-o) export SAVE_OVERLAY=1 SAVE_OVERLAY_PATH=/;;
-p) export SAVE_PARTITIONS=0;;
-u) export SKIP_UNCHANGED=1;;
-b|--create-backup) export CONF_BACKUP="$2" NEED_IMAGE=1; shift;;
@@ -54,12 +56,14 @@ IMAGE="$1"
[ -z "$IMAGE" -a -z "$NEED_IMAGE" -a $CONF_BACKUP_LIST -eq 0 -o $HELP -gt 0 ] && {
cat <<EOF
Usage: $0 [<upgrade-option>...] <image file or URL>
$0 [-q] [-i] [-c] [-u] <backup-command> <file>
$0 [-q] [-i] [-c] [-u] [-o] <backup-command> <file>
upgrade-option:
-f <config> restore configuration from .tar.gz (file or url)
-i interactive mode
-c attempt to preserve all changed files in /etc/
-o attempt to preserve all changed files in /, except those
from packages but including changed confs.
-u skip from backup files that are equal to those in /rom
-n do not save configuration over reflash
-p do not attempt to restore the partition table after flash.
@@ -129,12 +133,52 @@ add_conffiles() {

add_overlayfiles() {
local file="$1"
( cd /overlay/upper/; find ./etc \( -type f -o -type l \) $find_filter | sed \

local packagesfiles=$1.packagesfiles
touch "$packagesfiles"

if [ "$SAVE_OVERLAY_PATH" = / ]; then
local conffiles=$1.conffiles
local keepfiles=$1.keepfiles

list_conffiles | cut -f2 -d ' ' | sort -u > "$conffiles"

# backup files from /etc/sysupgrade.conf and /lib/upgrade/keep.d, but
# ignore those aready controlled by opkg conffiles
find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
/etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
\( -type f -o -type l \) 2>/dev/null | sort -u |
grep -h -v -x -F -f $conffiles > "$keepfiles"

# backup conffiles, but only those changed if '-u'
[ $SKIP_UNCHANGED = 1 ] &&
list_changed_conffiles | sort -u > "$conffiles"

# do not backup files from packages, except those listed
# in conffiles and keep.d
{
find /usr/lib/opkg/info -type f -name "*.list" -exec cat {} \;
find /usr/lib/opkg/info -type f -name "*.control" -exec sed \
-ne '/^Alternatives/{s/^Alternatives: //;s/, /\n/g;p}' {} \; |
cut -f2 -d:
} | grep -v -x -F -f $conffiles |
grep -v -x -F -f $keepfiles | sort -u > "$packagesfiles"
rm -f "$keepfiles" "$conffiles"
fi

# busybox grep bug when file is empty
[ -s "$packagesfiles" ] || echo > $packagesfiles

( cd /overlay/upper/; find .$SAVE_OVERLAY_PATH \( -type f -o -type l \) $find_filter | sed \
-e 's,^\.,,' \
-e '\,^/etc/board.json$,d' \
-e '\,/[^/]*-opkg$,d' \
-e '\,^/etc/urandom.seed$,d' \
)> "$file"
-e '\,^/usr/lib/opkg/.*,d' \
) | grep -v -x -F -f $packagesfiles > "$file"

rm -f "$packagesfiles"

return 0
}

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