base.bbclass: Split up as per the patch in OE.dev by Chris Larson making code more readable and modularised

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

meta/classes/metadata_scm.bbclass

@@ -0,0 +1,77 @@
+METADATA_BRANCH ?= "${@base_detect_branch(d)}"
+METADATA_REVISION ?= "${@base_detect_revision(d)}"
+
+def base_detect_revision(d):
+	path = base_get_scmbasepath(d)
+
+	scms = [base_get_metadata_git_revision, \
+			base_get_metadata_svn_revision]
+
+	for scm in scms:
+		rev = scm(path, d)
+		if rev <> "<unknown>":
+			return rev
+
+	return "<unknown>"	
+
+def base_detect_branch(d):
+	path = base_get_scmbasepath(d)
+
+	scms = [base_get_metadata_git_branch]
+
+	for scm in scms:
+		rev = scm(path, d)
+		if rev <> "<unknown>":
+			return rev.strip()
+
+	return "<unknown>"	
+	
+	
+
+def base_get_scmbasepath(d):
+	path_to_bbfiles = bb.data.getVar( 'BBFILES', d, 1 ).split()
+	return path_to_bbfiles[0][:path_to_bbfiles[0].rindex( "packages" )]
+
+def base_get_metadata_monotone_branch(path, d):
+	monotone_branch = "<unknown>"
+	try:
+		monotone_branch = file( "%s/_MTN/options" % path ).read().strip()
+		if monotone_branch.startswith( "database" ):
+			monotone_branch_words = monotone_branch.split()
+			monotone_branch = monotone_branch_words[ monotone_branch_words.index( "branch" )+1][1:-1]
+	except:
+		pass
+	return monotone_branch
+
+def base_get_metadata_monotone_revision(path, d):
+	monotone_revision = "<unknown>"
+	try:
+		monotone_revision = file( "%s/_MTN/revision" % path ).read().strip()
+		if monotone_revision.startswith( "format_version" ):
+			monotone_revision_words = monotone_revision.split()
+			monotone_revision = monotone_revision_words[ monotone_revision_words.index( "old_revision" )+1][1:-1]
+	except IOError:
+		pass
+	return monotone_revision
+
+def base_get_metadata_svn_revision(path, d):
+	revision = "<unknown>"
+	try:
+		revision = file( "%s/.svn/entries" % path ).readlines()[3].strip()
+	except IOError:
+		pass
+	return revision
+
+def base_get_metadata_git_branch(path, d):
+	branch = os.popen('cd %s; git branch | grep "^* " | tr -d "* "' % path).read()
+
+	if len(branch) != 0:
+		return branch
+	return "<unknown>"
+
+def base_get_metadata_git_revision(path, d):
+	rev = os.popen("cd %s; git log -n 1 --pretty=oneline --" % path).read().split(" ")[0]
+	if len(rev) != 0:
+		return rev
+	return "<unknown>"
+