devshell: Add interactive python shell

index 92edb9e..a8e707d 100644
@@ -31,3 +31,79 @@ python () {
        d.setVarFlag("do_devshell", "manualfakeroot", "1")
        d.delVarFlag("do_devshell", "fakeroot")
 } 
+
+python do_devpyshell() {
+    m, s = os.openpty()
+    sname = os.ttyname(s)
+    os.system('stty cs8 -icanon min 1 -isig -echo -F %s > /dev/null 2> /dev/null' % sname)
+    pid = os.fork()
+    if pid:
+        oe_terminal("oepydevshell-internal.py %s" % sname, 'OpenEmbedded Developer PyShell', d)
+        os._exit(0)
+    else:
+        os.dup2(m, sys.stdin.fileno())
+        os.dup2(m, sys.stdout.fileno())
+        os.dup2(m, sys.stderr.fileno())
+        os.close(s)
+
+        sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+
+        bb.utils.nonblockingfd(sys.stdout)
+        bb.utils.nonblockingfd(sys.stderr)
+        bb.utils.nonblockingfd(sys.stdin)
+
+        _context = {
+            "os": os,
+            "bb": bb,
+            "time": time,
+            "d": d,
+        }
+
+        import code, select
+
+        ps1 = "pydevshell> "
+        ps2 = "... "
+        buf = []
+        more = False
+        try:
+            i = code.InteractiveInterpreter(locals=_context)
+            print("OE PyShell (PN = %s)\n" % d.getVar("PN", True))
+
+            def prompt(more):
+                if more:
+                    prompt = ps2
+                else:
+                    prompt = ps1
+                sys.stdout.write(prompt)
+
+            prompt(more)
+            while True:
+                try:
+                    try:
+                        (r, _, _) = select.select([sys.stdin], [], [], 1)
+                        if not r:
+                            continue
+                        line = sys.stdin.readline().strip()
+                    except EOFError as e:
+                        sys.stdout.write("\n")
+                    except (OSError, IOError) as e:
+                        if e.errno == 11:
+                            continue
+                        raise
+                    else:
+                        buf.append(line)
+                        source = "\n".join(buf)
+                        more = i.runsource(source, "<pyshell>")
+                        if not more:
+                            buf = []
+                        prompt(more)
+                except KeyboardInterrupt:
+                    i.write("\nKeyboardInterrupt\n")
+                    buf = []
+                    more = False
+        except Exception as e:
+            bb.fatal(str(e))
+}
+addtask devpyshell after do_patch
+
+do_devpyshell[nostamp] = "1"

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