Implement skiboot versioning

We grab a version from git tags (or SKIBOOT_VERSION environment variable),
optionally tack on EXTRA_VERSION (if from git) as well as add things to the
git version number if we're ahead of the most recent tag or the tree is dirty.

Also fix-up makefiles so that we don't have to rebuild version.c every time
you run make.

fsp attn area needed updating as we can have >40 character version strings.

We also export the version string via device tree rather than just the gitid.

For buildroot builds, setting SKIBOOT_VERSION environment variable to the
tag you grab will do the correct thing.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/make_version.sh b/make_version.sh
new file mode 100755
index 00000000..14097044
--- /dev/null
+++ b/make_version.sh
@@ -0,0 +1,38 @@
+#!/bin/bash
+
+if test -d .git;
+then
+	version=`git describe --exact-match 2>/dev/null`
+	if [ -z "$version" ];
+	then
+		version=`git describe 2>/dev/null`
+	fi
+	if [ -z "$version" ];
+	then
+		version=`git rev-parse --verify --short HEAD 2>/dev/null`
+	fi
+	if [ ! -z "$EXTRA_VERSION" ];
+	then
+		version="$version-$EXTRA_VERSION"
+	fi
+	if git diff-index --name-only HEAD |grep -qv '.git';
+	then
+		if [ ! -z "$USER" ];
+		then
+			version="$version-$USER"
+		fi
+		version="$version-dirty"
+		diffsha=`git diff|sha1sum`
+		diffsha=`cut -c-7 <<< "$diffsha"`
+		version="$version-$diffsha"
+	fi
+
+	echo $version
+else
+	if [ ! -z "$SKIBOOT_VERSION" ];
+	then
+		echo $SKIBOOT_VERSION
+	else
+		exit 1;
+	fi
+fi