[PATCH] lib/oe/lsb: Add basic LSB functions

[Richard Purdie <richard.purdie@linuxfoundation.org>]

This code was written by Christopher Larson <chris_larson@mentor.com> and
allows generation of the LSB release data based upon the lsb_release
command. It also includes a helper function to generate a string
representing a given distribution.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
diff --git a/meta/lib/oe/lsb.py b/meta/lib/oe/lsb.py
new file mode 100644
index 0000000..a774169
--- a/dev/null
+++ b/meta/lib/oe/lsb.py
@@ -0,0 +1,28 @@
+def release_dict():
+    """Return the output of lsb_release -a as a dictionary"""
+    from subprocess import PIPE
+
+    try:
+        output, err = bb.process.run(['lsb_release', '-a'], stderr=PIPE)
+    except bb.process.CmdError as exc:
+        return
+
+    data = {}
+    for line in output.splitlines():
+        try:
+            key, value = line.split(":\t", 1)
+        except ValueError:
+            continue
+        else:
+            data[key] = value
+    return data
+
+def distro_identifier(adjust_hook=None):
+    """Return a distro identifier string based upon lsb_release -ri,
+       with optional adjustment via a hook"""
+
+    lsb_data = release_dict()
+    distro_id, release = lsb_data['Distributor ID'], lsb_data['Release']
+    if adjust_hook:
+        distro_id, release = adjust_hook(distro_id, release)
+    return '{0}-{1}'.format(distro_id, release)