kbuild: support mercurial in setlocalversion

This represents mercurial changesets similarly to git.  For untagged
revisions, append the changeset id.  If there are uncommitted changes,
append -dirty.  For example, -hgc60016ba6237-dirty

Signed-off-by: Aron Griffis <aron@hp.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 82e4993f0a73..a80d6ea8a5bf 100644
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -19,4 +19,27 @@ if head=`git rev-parse --verify HEAD 2>/dev/null`; then
         if git diff-index HEAD | read dummy; then
                 printf '%s' -dirty
         fi
+
+        # All done with git
+        exit
+fi
+
+# Check for mercurial and a mercurial repo.
+if hgid=`hg id 2>/dev/null`; then
+        tag=`printf '%s' "$hgid" | cut -d' ' -f2`
+
+        # Do we have an untagged version?
+        if [ -z "$tag" -o "$tag" = tip ]; then
+                id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
+                printf '%s%s' -hg "$id"
+        fi
+
+        # Are there uncommitted changes?
+        # These are represented by + after the changeset id.
+        case "$hgid" in
+                *+|*+\ *) printf '%s' -dirty ;;
+        esac
+
+        # All done with mercurial
+        exit
 fi