SOURCES: kernel-config.awk (NEW) - kernel-config.py replacement written in ...

[sparky]

Author: sparky                       Date: Thu Sep 18 01:16:17 2008 GMT
Module: SOURCES                       Tag: HEAD
---- Log message:
- kernel-config.py replacement written in awk
- features:
-- pure awk, no need to BR: python, which may be problematic sometimes
-- over 40 times faster than python version (lacks value checking tho)
-- prints lots of useful warnings, like those:
    kernel-multiarch.config (2647): HW_RANDOM_VIRTIO=m should have explicit ` all='
    kernel-i386.config (60): CONFIG_NO_HZ already defined in: kernel-multiarch.config (103)

---- Files affected:
SOURCES:
   kernel-config.awk (NONE -> 1.1)  (NEW)

---- Diffs:

================================================================
Index: SOURCES/kernel-config.awk
diff -u /dev/null SOURCES/kernel-config.awk:1.1
--- /dev/null	Thu Sep 18 03:16:18 2008
+++ SOURCES/kernel-config.awk	Thu Sep 18 03:16:11 2008
@@ -0,0 +1,104 @@
+# A script for building kernel config from multiarch config file.
+# It also has some file merging facilities.
+#
+# usage:
+#  awk -v arch=%{_target_base_arch} -f path/to/kernel-config.awk \
+#    kernel-multiarch.config kernel-%{arch}.config kernel-%{some_feature}.config \
+#     > .config
+#
+# TODO:
+#  - check value correctness, should allow only:
+#    y, m, n, -[0-9]+, 0x[0-9A-Fa-f]+, ".*"
+#  - smarter arch split, there could be strings with spaces
+#    ( kernel-config.py does not suppoty it either )
+#  - use as many warnings as possible, we want our configs to be clean
+#  - allow more multiarch configs
+
+function warn( msg ) {
+	print FILENAME " (" FNR "): " msg > "/dev/stderr"
+}
+
+BEGIN {
+	if ( ! arch ) {
+		warn( "arch= must be specified" )
+		exit 1
+	}
+	firstfile = 1
+}
+
+{
+	# remember first file name
+	if ( ! file )
+		file = FILENAME
+
+	else if ( file != FILENAME ) { # second and following files
+		if ( match( $0, /CONFIG_[A-Za-z0-9_-]+/ ) ) {
+			option = substr( $0, RSTART, RLENGTH )
+			if ( $0 ~ "^" option "=.+$" || $0 ~ "^# " option " is not set$" ) {
+				if ( option in outputArray )
+					warn( option " already defined in: " outputArray[ option ] )
+				else {
+					print
+					outputArray[ option ] = FILENAME " (" FNR ")"
+				}
+			} else {
+				if ( ! /^#/ )
+					warn( "Incorrect line: " $0 )
+			}
+		} else if ( ! /^\s*$/ && ! /^#/ ) {
+			warn( "Incorrect line: " $0 )
+		}
+		next
+	}
+}
+
+# multiarch file proxessing
+
+/^#/ || /^\s*$/ {
+	next
+}
+
+/^CONFIG_/ {
+	warn( "Options should not start with CONFIG_" )
+	gsub( /^CONFIG_/, "" )
+}
+
+{
+	option = $1
+	line = $0
+	if ( option ~ /=/ ) {
+		warn( $0 " should have explicit ` all='" )
+		gsub( /=.*$/, "", option )
+		gsub( /^[^=]*=/, "", line )
+		line = "all=" line
+	} else {
+		gsub( "^" option, "", line )
+	}
+	split( line, archs )
+
+	dest = ""
+	for ( inx in archs ) {
+		split( archs[inx], opt, "=" );
+		if ( opt[1] == "all" )
+			dest = opt[2]
+
+		if ( opt[1] == arch ) {
+			dest = opt[2]
+			break
+		}
+	}
+	if ( length( dest ) ) {
+		option = "CONFIG_" option
+
+		if ( dest == "n" )
+			out = "# " option " is not set"
+		else
+			out = option "=" dest
+		print out
+
+		outputArray[ option ] = FILENAME " (" FNR ")"
+	}
+}
+
+END {
+}
================================================================