add new /bin/uci script and api for manipulating buildroot-ng config files

git-svn-id: svn://svn.openwrt.org/openwrt/branches/buildroot-ng/openwrt@4982 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 298 insertions, 0 deletions

diff --git a/package/base-files/default/lib/config/uci-update.awk b/package/base-files/default/lib/config/uci-update.awk
new file mode 100644
index 000000000..efa875850
--- /dev/null
+++ b/package/base-files/default/lib/config/uci-update.awk
@@ -0,0 +1,160 @@
+# Configuration update functions
+#
+# Copyright (C) 2006 by Fokus Fraunhofer <carsten.tittel@fokus.fraunhofer.de>
+# Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+
+function read_file(filename,  result) {
+	while ((getline <filename) == 1) {
+		result = result $0 "\n"
+	}
+	gsub(/\n*$/, "", result)
+	return result
+}
+
+function cmd2option(str,  tmp) {
+	if (match(str,"=")!=0) {
+		res = "\toption " substr(str,1,RSTART-1) "\t'" substr(str,RSTART+1) "'"
+	} else {
+		res= ""
+	}
+	return res
+}
+
+function cmd2config(atype,  aname) {
+	return "config \"" atype "\" \"" aname "\""
+}
+
+function update_config(cfg, update,  \
+  lines, line, l, n, i, i2, section, scnt, remove, tmp, aidx, rest) {
+	scnt = 1
+	linecnt=split(cfg "\n", lines, "\n")
+
+	cfg = ""
+	for (n = 1; n < linecnt; n++) {
+		# stupid parser for quoted arguments (e.g. for the type string).
+		# not to be used to gather variable values (backslash escaping doesn't work)
+		line = lines[n]
+		gsub(/^[ \t]*/, "", line)
+		gsub(/#.*$/, "", line)
+		i2 = 1
+		delete l
+		rest = line
+        	while (length(rest)) {
+			if (match(rest, /[ \t\"]+/)) {
+				if (RSTART>1) {
+					l[i2] = substr(rest,1,RSTART-1)
+					i2++
+				}
+				aidx=index(rest,"\"")
+				if (aidx>=RSTART && aidx<=RSTART+RLENGTH) {
+					rest=substr(rest,aidx+1)
+					# find the end of the string
+					match(rest,/\"/)
+					l[i2]=substr(rest,1,RSTART-1)
+					i2++
+				}
+				rest=substr(rest,RSTART+RLENGTH)
+			} else {
+				l[i2] = rest
+				i2++
+				rest = ""
+			}
+		}
+		line = lines[n]
+		
+		# when a command wants to set a config value for the current
+		# section and a blank line is encountered before an option with
+		# the same name, insert it here to maintain some coherency between
+		# manually and automatically created option lines
+		# if an option with the same name appears after this point, simply
+		# ignore it, because it is already set.
+		if ((section != "") && (l[1] != "option")) {
+			if (line ~ /^[ \t]*$/) {
+				if (update ~ "^" section "\\.") {
+					gsub("^" section ".", "", update)
+					cfg = cfg cmd2option(update) "\n"
+					gsub(/=.*$/, "", update)
+					update = "-" section "." update
+				}
+			}
+		}
+
+		if (l[1] == "config") {
+			# look for all unset values
+			if (section != "") {
+				flag=0
+				if (update ~ "^" section "\\.") {
+					flag=1
+					gsub("^" section ".", "", update)
+					cfg = cfg cmd2option(update) "\n"
+					
+					update = "-" section "." update
+				} 
+				if (flag!=0) cfg = cfg "\n"
+			}
+			
+			remove = ""
+			section = l[3]
+			if (!length(section)) {
+				section = "cfg" scnt
+			}	
+			scnt++
+			if (update == "-" section) {
+				remove = "section"
+				update = ""
+			} else if (update ~ "^@" section "=") {
+				update = ""
+			} else if (update ~ "^&" section "=") {
+				gsub("^&" section "=", "", update)
+				line = cmd2config(l[2],update) 
+				update = ""
+			}
+		}
+		if (remove == "option") remove = ""
+		if (l[1] == "option") {
+			if (update ~ "^-" section "\\." l[2] "$") remove = "option"
+			# if a supplied config value already exists, replace the whole line
+			if (match(update, "^" section "." l[2] "=")) {
+				gsub("^" section ".", "", update)
+				line = cmd2option(update)
+				update = ""
+			}
+		}
+		if (remove == "") cfg = cfg line "\n"
+	}
+	
+	# any new options for the last section??
+	if (section != "") {
+		if (update ~ "^" section "\\.") {
+			gsub("^" section ".", "", update)
+			cfg = cfg cmd2option(update) "\n"
+
+			update = "-" section "." update
+		} 
+	}
+
+	if (update ~ "^@") {
+		# new section
+		section = stype = substr(update,2)
+		gsub(/=.*$/,"",section)
+		gsub(/^.*=/,"",stype)
+		cfg = cfg "\nconfig \"" stype "\" \"" section "\"\n"
+	}
+
+	return cfg
+}
diff --git a/package/base-files/default/lib/config/uci.sh b/package/base-files/default/lib/config/uci.sh
new file mode 100755
index 000000000..ccd6ee57b
--- /dev/null
+++ b/package/base-files/default/lib/config/uci.sh
@@ -0,0 +1,138 @@
+#!/bin/sh
+# Shell script defining macros for manipulating config files
+#
+# Copyright (C) 2006 by Fokus Fraunhofer <carsten.tittel@fokus.fraumhofer.de>
+# Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+uci_load() {
+	config_load "$PACKAGE"
+	local PACKAGE_BASE="$(basename "$PACKAGE")"
+	[ -f "/tmp/.uci/${PACKAGE_BASE}" ] && {
+		. "/tmp/.uci/${PACKAGE_BASE}"
+		config_cb
+	}
+}
+
+uci_do_update() {
+	local FILENAME="$1"
+	local UPDATE="$2"
+	awk -f /lib/config/uci-update.awk -f - <<EOF
+BEGIN {
+	config = read_file("$FILENAME")
+	$UPDATE
+	print config
+}
+EOF
+}
+
+uci_add_update() {
+	local PACKAGE="$1"
+	local UPDATE="$2"
+	local PACKAGE_BASE="$(basename "$PACKAGE")"
+	
+	# FIXME: add locking?
+	mkdir -p "/tmp/.uci"
+	echo "$UPDATE" >> "/tmp/.uci/${PACKAGE_BASE}"
+}
+
+uci_set() {
+	local PACKAGE="$1"
+	local CONFIG="$2"
+	local OPTION="$3"
+	local VALUE="$4"
+
+	( # spawn a subshell so you don't mess up the current environment
+		uci_load "$PACKAGE"
+		config_get type "$CONFIG" TYPE
+		[ -z "$type" ]
+	) || uci_add_update "$PACKAGE" "CONFIG_SECTION='$CONFIG'${N}option '$OPTION' '$VALUE'"
+}
+
+uci_add() {
+	local PACKAGE="$1"
+	local TYPE="$2"
+	local CONFIG="$3"
+
+	uci_add_update "$PACKAGE" "config '$TYPE' '$CONFIG'"
+}
+
+uci_rename() {
+	local PACKAGE="$1"
+	local CONFIG="$2"
+	local VALUE="$3"
+
+	uci_add_update "$PACKAGE" "config_rename '$CONFIG' '$VALUE'"
+}
+
+uci_remove() {
+	local PACKAGE="$1"
+	local CONFIG="$2"
+	local OPTION="$3"
+
+	if [ -z "$OPTION" ]; then
+		uci_add_update "$PACKAGE" "config_clear '$CONFIG'"
+	else
+		uci_add_update "$PACKAGE" "config_unset '$CONFIG' '$OPTION'"
+	fi
+}
+
+uci_commit() {
+	local PACKAGE="$1"
+	local PACKAGE_BASE="$(basename "$PACKAGE")"
+	
+	mkdir -p /tmp/.uci
+	lock "/tmp/.uci/$PACKAGE_BASE.lock"
+	[ -f "/tmp/.uci/$PACKAGE_BASE" ] && (
+		updatestr=""
+		
+		# replace handlers
+		config() {
+			append updatestr "config = update_config(config, \"@$2=$1\")" "$N"
+		}
+		option() {
+			append updatestr "config = update_config(config, \"$CONFIG_SECTION.$1=$2\")" "$N"
+		}
+		config_rename() {
+			append updatestr "config = update_config(config, \"&$1=$2\")" "$N"
+		}
+		config_unset() {
+			append updatestr "config = update_config(config, \"-$1.$2\")" "$N"
+		}
+		config_clear() {
+			append updatestr "config = update_config(config, \"-$1\")" "$N"
+		}
+		
+		. "/tmp/.uci/$PACKAGE_BASE"
+
+		# completely disable handlers so that they don't get in the way
+		config() {
+			return 0
+		}
+		option() {
+			return 0
+		}
+		
+		config_load "$PACKAGE" || CONFIG_FILENAME="$ROOT/etc/config/$PACKAGE_BASE"
+		uci_do_update "$CONFIG_FILENAME" "$updatestr" > "/tmp/.uci/$PACKAGE_BASE.new" && {
+			mv -f "/tmp/.uci/$PACKAGE_BASE.new" "$CONFIG_FILENAME" && \
+			rm -f "/tmp/.uci/$PACKAGE_BASE"
+		} 
+	)
+	lock -u "/tmp/.uci/$PACKAGE_BASE.lock"
+}
+
+