From 36734f34fe6e4b91e293234687e63c02f5b3117e Mon Sep 17 00:00:00 2001
From: Richard Purdie <richard.purdie@linuxfoundation.org>
Date: Tue, 27 May 2014 16:09:16 +0100
Subject: devshell: Add interactive python shell

Being able to interact with the python context in the Bitbake task execution
environment has long been desireable. This patch introduces such a
mechanism. Executing "bitbake X -c devpyshell" will open a terminal connected
to a python interactive interpretor in the task context so for example you can
run commands like "d.getVar('WORKDIR')"

This version now includes readline support for command history and various other
bug fixes such as exiting cleanly compared to previous versions.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 meta/classes/devshell.bbclass | 121 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)

(limited to 'meta/classes/devshell.bbclass')

diff --git a/meta/classes/devshell.bbclass b/meta/classes/devshell.bbclass
index 92edb9ef25..41164a3f33 100644
--- a/meta/classes/devshell.bbclass
+++ b/meta/classes/devshell.bbclass
@@ -31,3 +31,124 @@ python () {
        d.setVarFlag("do_devshell", "manualfakeroot", "1")
        d.delVarFlag("do_devshell", "fakeroot")
 } 
+
+def devpyshell(d):
+
+    import code
+    import select
+    import signal
+    import termios
+
+    m, s = os.openpty()
+    sname = os.ttyname(s)
+
+    def noechoicanon(fd):
+        old = termios.tcgetattr(fd)
+        old[3] = old[3] &~ termios.ECHO &~ termios.ICANON
+        # &~ termios.ISIG
+        termios.tcsetattr(fd, termios.TCSADRAIN, old)
+    
+    # No echo or buffering over the pty
+    noechoicanon(s)
+
+    pid = os.fork()
+    if pid:
+        os.close(m)
+        oe_terminal("oepydevshell-internal.py %s %d" % (sname, pid), 'OpenEmbedded Developer PyShell', d)
+        os._exit(0)
+    else:
+        os.close(s)
+
+        os.dup2(m, sys.stdin.fileno())
+        os.dup2(m, sys.stdout.fileno())
+        os.dup2(m, sys.stderr.fileno())
+
+        sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+        sys.stdin = os.fdopen(sys.stdin.fileno(), 'r', 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,
+        }
+
+        ps1 = "pydevshell> "
+        ps2 = "... "
+        buf = []
+        more = False
+
+        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)
+
+        # Restore Ctrl+C since bitbake masks this
+        def signal_handler(signal, frame):
+            raise KeyboardInterrupt
+        signal.signal(signal.SIGINT, signal_handler)
+
+        child = None
+
+        prompt(more)
+        while True:
+            try:
+                try:
+                    (r, _, _) = select.select([sys.stdin], [], [], 1)
+                    if not r:
+                        continue
+                    line = sys.stdin.readline().strip()
+                    if not line:
+                        prompt(more)
+                        continue
+                except EOFError as e:
+                    sys.stdout.write("\n")
+                except (OSError, IOError) as e:
+                    if e.errno == 11:
+                        continue
+                    if e.errno == 5:
+                        return
+                    raise
+                else:
+                    if not child:
+                        child = int(line)
+                        continue
+                    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
+                prompt(more)
+            except SystemExit:
+                # Easiest way to ensure everything exits
+                os.kill(child, signal.SIGTERM)
+                break
+
+python do_devpyshell() {
+    import signal
+
+    try:
+        devpyshell(d)
+    except SystemExit:
+        # Stop the SIGTERM above causing an error exit code    
+        return
+    finally:
+        return
+}
+addtask devpyshell after do_patch
+
+do_devpyshell[nostamp] = "1"
-- 
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