generate files/etc/{banner, firmware} from repository state

The new script ./name_firmware is used to generates two files in
openwrt/$REPO/files/ during `make image/...`:
- /etc/firmware (see documentation on firmware id)
- /etc/banner (login banner; generated from the template in
  /files/common/etc/banner)

4 files changed, 51 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index c4c09b6..b65ac75 100644
--- a/Makefile
+++ b/Makefile
@@ -64,6 +64,7 @@ image/%: config/$$(REPO)-$$(PLATFORM)-$$(MODEL).config \
 	cp -a files/common openwrt/$(REPO)/files
 	[ -d files/$(PLATFORM) ] && rsync -a files/$(PLATFORM)/ openwrt/$(REPO)/files/
 	[ -d files/$(PLATFORM)-$(MODEL) ] && rsync -a files/$(PLATFORM)-$(MODEL)/ openwrt/$(REPO)/files/
+	./name_firmware openwrt/$(REPO)
 	cd openwrt/$(REPO) && $(MAKE) -j$(NUMPROC)
 	mkdir -p $@
 	rsync -a openwrt/$(REPO)/bin/$(PLATFORM)/ $@/
diff --git a/doc/overview.org b/doc/overview.org
index 78bf230..40fe441 100644
--- a/doc/overview.org
+++ b/doc/overview.org
@@ -103,12 +103,18 @@ digraph {
        verified
 
     Once this state is reached the update is performed.
-  
+    
 * Components
 ** Firmware ID
-   /etc/firmware stores sha256 of the current firmware. If a node is
-   intensively modified after flashing the value is replaced (e.g. by
-   "custom").
+   /etc/firmware stores a string identifying the current firmware. It
+   consists of
+   1. the date of the git commit of the FFJ config
+   2.   a hash of the git commit of the FFJ config
+   3. the OpenWRT major version
+   4. the OpenWRT revision
+
+   Example:
+   2011-12-06_a4fa439-modified_backfire-29460
 ** Router IDs
    - unique ID :: all routers use /proc/sys/kernel/random/boot_id as
                   unique ID
diff --git a/files/common/etc/banner b/files/common/etc/banner
new file mode 100644
index 0000000..8ec5cc8
--- /dev/null
+++ b/files/common/etc/banner
@@ -0,0 +1,13 @@
+##################################################################
+#  ______       _  __             _        ___                   #
+# |  ___|      (_)/ _|           | |      |_  |                  #
+# | |_ _ __ ___ _| |_ _   _ _ __ | | __     | | ___ _ __   __ _  #
+# |  _| '__/ _ \ |  _| | | | '_ \| |/ /     | |/ _ \ '_ \ / _' | #
+# | | | | |  __/ | | | |_| | | | |   <  /\__/ /  __/ | | | (_| | #
+# |_| |_|  \___|_|_|  \__,_|_| |_|_|\_\ \____/ \___|_| |_|\__,_| #
+#                                                                #
+#  * OpenWRT $VWRT                                               #
+#  * FFJ config $VGIT                                            #
+#  * Gebaut am $HDATE                                            #
+#  * http://www.freifunk-jena.de                                 #
+##################################################################
diff --git a/name_firmware b/name_firmware
new file mode 100755
index 0000000..bf062d3
--- /dev/null
+++ b/name_firmware
@@ -0,0 +1,27 @@
+#!/bin/bash -e
+
+[ -d "$1" ] || {
+    echo "Usage: $0 target-repo"; 
+    exit 1;
+}
+
+REPO=$1
+OB=$1/files/etc/banner
+OF=$1/files/etc/firmware
+
+HDATE="$(date +'%d.%m.%Y %H:%M')"
+VGIT=$(
+    git log --format=format:%cd_%h --date=short | head -n1 | tr -d "\n";
+    [ -n "$$(git status --porcelain)" ] && echo -n "-modified";
+)
+VWRT=$(basename $REPO)-$(cd $REPO; svn info | grep Revision | cut -f2 -d' ')
+MACHINE="$USER @ $HOST"
+
+# firmware id
+echo "${VGIT}_$VWRT" > $OF
+
+# banner
+sed < files/common/etc/banner > $OB \
+'s/$VWRT.\{'$(($(echo -n "$VWRT"|wc -c) - 5))'\}/'"$VWRT"'/
+s/$VGIT.\{'$(($(echo -n "$VGIT"|wc -c) - 5))'\}/'"$VGIT"'/
+s/$HDATE.\{'$(($(echo -n "$HDATE"|wc -c) - 6))'\}/'"$HDATE"'/'