[U-Boot] [PATCH] tools/setlocalversion: Update from the Linux Kernel

[Kyle Moffett]

Several bugfixes have occurred upstream since this script was imported
into U-Boot.

In particular, the script currently in U-Boot does not correctly decode
the localversion for commit f8bbb4dad0e9d91b7a51d6cc54dcf66d142f50fe,
because "git name-rev --tags HEAD" gives this:
  HEAD tags/v2011.12-rc1~30^2

Then this regex does not match because of the trailing '^2':
  grep -E '^HEAD[[:space:]]+(.*~[0-9]*|undefined)$'

The kernel has a bit of extra support for CONFIG_LOCALVERSION set up in
a ".config" file which is unnecessary in U-Boot, so it isn't exactly
identical, but it is very close to the version in Linux v3.2-rc4.

Signed-off-by: Kyle Moffett <Kyle.D.Moffett at boeing.com>
---
 tools/setlocalversion |  138 ++++++++++++++++++++++++++++++++++++++++---------
 1 files changed, 113 insertions(+), 25 deletions(-)

diff --git a/tools/setlocalversion b/tools/setlocalversion
index e11f54f..70ab70d 100755
--- a/tools/setlocalversion
+++ b/tools/setlocalversion
@@ -1,40 +1,128 @@
 #!/bin/sh
-# Print additional version information for non-release trees.
+#
+# This scripts adds local version information from the version
+# control systems git, mercurial (hg) and subversion (svn).
+#
+# It was originally copied from the Linux kernel v3.2.0-rc4 and modified
+# to support the U-Boot build-system.
+#
 
 usage() {
-	echo "Usage: $0 [srctree]" >&2
+	echo "Usage: $0 [--save-scmversion] [srctree]" >&2
 	exit 1
 }
 
-cd "${1:-.}" || usage
+scm_only=false
+srctree=.
+if test "$1" = "--save-scmversion"; then
+	scm_only=true
+	shift
+fi
+if test $# -gt 0; then
+	srctree=$1
+	shift
+fi
+if test $# -gt 0 -o ! -d "$srctree"; then
+	usage
+fi
+
+scm_version()
+{
+	local short
+	short=false
+
+	cd "$srctree"
+	if test -e .scmversion; then
+		cat .scmversion
+		return
+	fi
+	if test "$1" = "--short"; then
+		short=true
+	fi
+
+	# Check for git and a git repo.
+	if test -e .git && head=`git rev-parse --verify --short HEAD 2>/dev/null`; then
+
+		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
+		# it, because this version is defined in the top level Makefile.
+		if [ -z "`git describe --exact-match 2>/dev/null`" ]; then
+
+			# If only the short version is requested, don't bother
+			# running further git commands
+			if $short; then
+				echo "+"
+				return
+			fi
+			# If we are past a tagged commit (like
+			# "v2.6.30-rc5-302-g72357d5"), we pretty print it.
+			if atag="`git describe 2>/dev/null`"; then
+				echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
 
-# Check for git and a git repo.
-if head=`git rev-parse --verify HEAD 2>/dev/null`; then
-	# Do we have an untagged version?
-	if git name-rev --tags HEAD | \
-	   grep -E '^HEAD[[:space:]]+(.*~[0-9]*|undefined)$' > /dev/null; then
-	        (git describe || git describe --tags || git describe --all --long) \
-				2>/dev/null | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
+			# If we don't have a tag at all we print -g{commitish}.
+			else
+				printf '%s%s' -g $head
+			fi
+		fi
+
+		# Is this git on svn?
+		if git config --get svn-remote.svn.url >/dev/null; then
+			printf -- '-svn%s' "`git svn find-rev $head`"
+		fi
+
+		# Update index only on r/w media
+		[ -w . ] && git update-index --refresh --unmerged > /dev/null
+
+		# Check for uncommitted changes
+		if git diff-index --name-only HEAD | grep -v "^scripts/package" \
+		    | read dummy; then
+			printf '%s' -dirty
+		fi
+
+		# All done with git
+		return
 	fi
 
-	# Are there uncommitted changes?
-	git update-index --refresh --unmerged > /dev/null
-	if git diff-index --name-only HEAD | grep -v "^scripts/package" \
-	    | read dummy; then
-		printf '%s' -dirty
+	# Check for mercurial and a mercurial repo.
+	if test -d .hg && hgid=`hg id 2>/dev/null`; then
+		# Do we have an tagged version?  If so, latesttagdistance == 1
+		if [ "`hg log -r . --template '{latesttagdistance}'`" == "1" ]; then
+			id=`hg log -r . --template '{latesttag}'`
+			printf '%s%s' -hg "$id"
+		else
+			tag=`printf '%s' "$hgid" | cut -d' ' -f2`
+			if [ -z "$tag" -o "$tag" = tip ]; then
+				id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
+				printf '%s%s' -hg "$id"
+			fi
+		fi
+
+		# Are there uncommitted changes?
+		# These are represented by + after the changeset id.
+		case "$hgid" in
+			*+|*+\ *) printf '%s' -dirty ;;
+		esac
+
+		# All done with mercurial
+		return
 	fi
 
-	# Is this git on svn?
-	if git config --get svn-remote.svn.url >/dev/null; then
-		printf -- '-svn%s' "`git svn find-rev $head`"
+	# Check for svn and a svn repo.
+	if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then
+		rev=`echo $rev | awk '{print $NF}'`
+		printf -- '-svn%s' "$rev"
+
+		# All done with svn
+		return
 	fi
-fi
+}
 
-# Check for svn and a svn repo.
-if rev=`svn info 2>/dev/null` ; then
-	rev=`echo "${rev}" | grep '^Revision' | awk '{print $NF}'`
-	printf -- '-svn%s' $rev
+if $scm_only; then
+	if test ! -e .scmversion; then
+		res=$(scm_version)
+		echo "$res" >.scmversion
+	fi
+	exit
 fi
 
-# Check for any localversion-* files
-printf '%s' "`cat localversion-* 2>/dev/null`"
+scm_version
+exit 0
-- 
1.7.7.3