[package] base-files: implement a --force option for sysupgrade to override image...

[openwrt.git] / package / base-files / files / sbin / sysupgrade

diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index f25195a..be11c5b 100755 (executable)
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -7,8 +7,13 @@ RAMFS_COPY_DATA=""     # extra data files
 export INTERACTIVE=0
 export VERBOSE=1
 export SAVE_CONFIG=1
+export SAVE_OVERLAY=0
 export DELAY=
 export CONF_IMAGE=
+export CONF_BACKUP=
+export HELP=0
+export FORCE=0
+
 # parse options
 while [ -n "$1" ]; do 
        case "$1" in
@@ -17,7 +22,11 @@ while [ -n "$1" ]; do
                -v) export VERBOSE="$(($VERBOSE + 1))";;
                -q) export VERBOSE="$(($VERBOSE - 1))";;
                -n) export SAVE_CONFIG=0;;
+               -c) export SAVE_OVERLAY=1;;
+               -b|--create-backup) export CONF_BACKUP="$2"; shift;;
                -f) export CONF_IMAGE="$2"; shift;;
+               -F|--force) export FORCE=1; shift;;
+               -h|--help) export HELP=1; break;;
                -*)
                        echo "Invalid option: $1"
                        exit 1
@@ -33,7 +42,7 @@ export CONF_TAR=/tmp/sysupgrade.tgz
 export ARGV="$*"
 export ARGC="$#"
 
-[ -z "$ARGV" ] && {
+[ -z "$ARGV" -a -z "$CONF_BACKUP" -o $HELP -gt 0 ] && {
        cat <<EOF
 Usage: $0 [options] <image file or URL>
 
@@ -41,27 +50,64 @@ Options:
        -d <delay>   add a delay before rebooting
        -f <config>  restore configuration from .tar.gz (file or url)
        -i           interactive mode
-       -n           do not save configuration over reflash
+       -c           attempt to preserve all changed files in /etc/
+       -b / --create-backup <file>
+                    create .tar.gz of files specified in sysupgrade.conf
+                    then exit. Does not flash an image. If file is '-',
+                    i.e. stdout, verbosity is set to 0 (i.e. quiet).
+       -n           do not save configuration over reflash
+       -F / --force
+                    Flash image even if image checks fail, this is dangerous!
        -q           less verbose
        -v           more verbose
+       -h / --help  display this help
 
 EOF
        exit 1
 }
 
+[ -n "$ARGV" -a -n "$CONF_BACKUP" ] && {
+       cat <<-EOF
+               -b/--create-backup does not perform a firmware upgrade. Do not
+               specify both -b and a firmware image.
+       EOF
+       exit 1
+}
+
+# prevent messages from clobbering the tarball when using stdout
+[ "$CONF_BACKUP" = "-" ] && export VERBOSE=0
+
 add_uci_conffiles() {
        local file="$1"
-       find /etc/config /etc/passwd /etc/group /etc/dropbear /etc/firewall.user > "$file"
+       ( find $(sed -ne '/^[[:space:]]*$/d; /^#/d; p' \
+               /etc/sysupgrade.conf /lib/upgrade/keep.d/* 2>/dev/null) \
+               -type f 2>/dev/null;
+         opkg list-changed-conffiles ) | sort -u > "$file"
+       return 0
+}
+
+add_overlayfiles() {
+       local file="$1"
+       find /overlay/etc/ -type f | sed \
+               -e 's,^/overlay/,/,' \
+               -e '\,/META_[a-zA-Z0-9]*$,d' \
+               -e '\,/functions.sh$,d' \
+               -e '\,/[^/]*-opkg$,d' \
+       > "$file"
        return 0
 }
 
 # hooks
 sysupgrade_image_check="platform_check_image"
-sysupgrade_init_conffiles="add_uci_conffiles"
+[ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
+       sysupgrade_init_conffiles="add_uci_conffiles" || \
+       sysupgrade_init_conffiles="add_overlayfiles"
 
 include /lib/upgrade
 
 do_save_conffiles() {
+       local conf_tar="${1:-$CONF_TAR}"
+
        [ -z "$(rootfs_type)" ] && {
                echo "Cannot save config while running from ramdisk."
                ask_bool 0 "Abort" && exit
@@ -72,9 +118,14 @@ do_save_conffiles() {
 
        v "Saving config files..."
        [ "$VERBOSE" -gt 1 ] && TAR_V="v" || TAR_V=""
-       tar c${TAR_V}zf "$CONF_TAR" -T "$CONFFILES" 2>/dev/null
+       tar c${TAR_V}zf "$conf_tar" -T "$CONFFILES" 2>/dev/null
 }
 
+if [ -n "$CONF_BACKUP" ]; then
+       do_save_conffiles "$CONF_BACKUP"
+       exit $?
+fi
+
 type platform_check_image >/dev/null 2>/dev/null || {
        echo "Firmware upgrade is not implemented for this platform."
        exit 1
@@ -82,13 +133,18 @@ type platform_check_image >/dev/null 2>/dev/null || {
 
 for check in $sysupgrade_image_check; do
        ( eval "$check \"\$ARGV\"" ) || {
-               echo "Image check '$check' failed."
-               exit 1
+               if [ $FORCE -eq 1 ]; then
+                       echo "Image check '$check' failed but --force given - will update anyway!"
+                       break
+               else
+                       echo "Image check '$check' failed."
+                       exit 1
+               fi
        }
 done
 
 if [ -n "$CONF_IMAGE" ]; then
-       case "$(get_magic_word "$CONF_IMAGE")" in
+       case "$(get_magic_word $CONF_IMAGE cat)" in
                # .gz files
                1f8b) ;;
                *)
@@ -104,8 +160,13 @@ elif ask_bool $SAVE_CONFIG "Keep config files over reflash"; then
 else
        export SAVE_CONFIG=0
 fi
+
 run_hooks "" $sysupgrade_pre_upgrade
 
+kill_remaining TERM
+sleep 3
+kill_remaining KILL
+
 if [ -n "$(rootfs_type)" ]; then
        v "Switching to ramdisk..."
        run_ramfs '. /etc/functions.sh; include /lib/upgrade; do_upgrade'