[ptxdist] rework version generation

This patch aims to fix some problems of the version handling of
ptxdist which were introducted with switching to timed releases:

a) The version is specified in "configure.ac", the "local version"
   ("00003-gbf29f16") is generated by "setlocalversion".
   "setlocalversion" generates it's ouput relative to the latest tag.
   This leads to strange version strings, after creating a tag, and
   forgetting to run "./autogen.sh && ./configure && make".
b) The ptxdist created with a "make dist", even if a not tagged version,
   always thinks it's a release.
c) BSPs working with "master" need a migrate after each release. Because
   the compatibility checker uses year and month.

The problems are^Wshould be fixed with these changes:

a) "setlocalversion" now generates the whole full version, e.g.:
   "2010.04.0-00003-gbf29f16".
   "configure.ac" uses "m4_esyscmd" to figure out the current version
   while running "configure". (Yes, "configure").
b) A file ".tarball-version" is added to the tarball to track the
   version while creating the tarball (same goes for the installation).
   "setlocalversion" will use the version information from
   ".tarball-version"
c) If both ptxdist and config file are not using a release, i.e. their
   versions an "appendix", we say it's compatibe, too.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

1 files changed, 28 insertions, 0 deletions

diff --git a/scripts/ptxdist_version.sh b/scripts/ptxdist_version.sh
new file mode 100644
index 000000000..543f61820
--- /dev/null
+++ b/scripts/ptxdist_version.sh
@@ -0,0 +1,28 @@
+#!/bin/bash
+
+#
+# version definition for ptxdist
+#
+_ptxd_get_version()
+{
+    PTXDIST_VERSION_FULL="$("${PTXDIST_TOPDIR:=.}/scripts/kernel/setlocalversion" "${PTXDIST_TOPDIR}/.tarball-version")"
+
+    local orig_IFS="${IFS}"
+    local IFS="."
+    set -- ${PTXDIST_VERSION_FULL}
+    IFS="${orig_IFS}"
+
+    PTXDIST_VERSION_YEAR="${1}"
+    PTXDIST_VERSION_MONTH="${2}"
+    PTXDIST_VERSION_BUGFIX="${3%%-*}"
+    PTXDIST_VERSION_SCM="${3#*-}"
+
+    if [ -n "${PTXDIST_VERSION_SCM}" ]; then
+	PTXDIST_VERSION_PTXRC="git"
+    else
+	PTXDIST_VERSION_PTXRC="${PTXDIST_VERSION_YEAR}.${PTXDIST_VERSION_MONTH}"
+    fi
+
+}
+
+_ptxd_get_version