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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 /scripts
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 'scripts')
-rwxr-xr-xscripts/oepydevshell-internal.py92
1 files changed, 92 insertions, 0 deletions
diff --git a/scripts/oepydevshell-internal.py b/scripts/oepydevshell-internal.py
new file mode 100755
index 00000000000..f7b2e4e0bf5
--- /dev/null
+++ b/scripts/oepydevshell-internal.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import time
+import select
+import fcntl
+import termios
+import readline
+import signal
+
+def nonblockingfd(fd):
+ fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
+
+def echonocbreak(fd):
+ old = termios.tcgetattr(fd)
+ old[3] = old[3] | termios.ECHO | termios.ICANON
+ termios.tcsetattr(fd, termios.TCSADRAIN, old)
+
+def cbreaknoecho(fd):
+ old = termios.tcgetattr(fd)
+ old[3] = old[3] &~ termios.ECHO &~ termios.ICANON
+ termios.tcsetattr(fd, termios.TCSADRAIN, old)
+
+if len(sys.argv) != 3:
+ print("Incorrect parameters")
+ sys.exit(1)
+
+pty = open(sys.argv[1], "w+b", 0)
+parent = int(sys.argv[2])
+
+# Don't buffer output by line endings
+sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+sys.stdin = os.fdopen(sys.stdin.fileno(), 'r', 0)
+nonblockingfd(pty)
+nonblockingfd(sys.stdin)
+
+
+histfile = os.path.expanduser("~/.oedevpyshell-history")
+readline.parse_and_bind("tab: complete")
+try:
+ readline.read_history_file(histfile)
+except IOError:
+ pass
+
+try:
+
+ i = ""
+ o = ""
+ # Need cbreak/noecho whilst in select so we trigger on any keypress
+ cbreaknoecho(sys.stdin.fileno())
+ # Send our PID to the other end so they can kill us.
+ pty.write(str(os.getpid()) + "\n")
+ while True:
+ try:
+ writers = []
+ if i:
+ writers.append(sys.stdout)
+ (ready, _, _) = select.select([pty, sys.stdin], writers , [], 0)
+ try:
+ if pty in ready:
+ i = i + pty.read()
+ if i:
+ # Write a page at a time to avoid overflowing output
+ # d.keys() is a good way to do that
+ sys.stdout.write(i[:4096])
+ i = i[4096:]
+ if sys.stdin in ready:
+ echonocbreak(sys.stdin.fileno())
+ o = raw_input()
+ cbreaknoecho(sys.stdin.fileno())
+ pty.write(o + "\n")
+ except (IOError, OSError) as e:
+ if e.errno == 11:
+ continue
+ if e.errno == 5:
+ sys.exit(0)
+ raise
+ except EOFError:
+ sys.exit(0)
+ except KeyboardInterrupt:
+ os.kill(parent, signal.SIGINT)
+
+except SystemExit:
+ pass
+except Exception as e:
+ import traceback
+ print("Exception in oepydehshell-internal: " + str(e))
+ traceback.print_exc()
+ time.sleep(5)
+finally:
+ readline.write_history_file(histfile)