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authorRichard Purdie <richard.purdie@linuxfoundation.org>2014-05-27 16:09:16 +0100
committerRichard Purdie <richard.purdie@linuxfoundation.org>2014-05-28 08:20:17 +0100
commit36734f34fe6e4b91e293234687e63c02f5b3117e (patch)
treea9ac04329b0aa9e94698451a5d06988a81f4ad19 /meta/classes/devshell.bbclass
parentce23c1cc33a015fbd184df6c16658353334ab611 (diff)
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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>
Diffstat (limited to 'meta/classes/devshell.bbclass')
-rw-r--r--meta/classes/devshell.bbclass121
1 files changed, 121 insertions, 0 deletions
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"