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Use proper pseudo-tty's instead of pipes when using subprocess

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This change avoids the "tcgetattr: Invalid argument" error by making sure the ssh we start does have a proper pseudo-tty.

We could also check whether our current terminal is a proper terminal (by doing a tcgetattr ourselves) but I don't think this adds anything.

This closes #1662 (if all use-cases have been tested: sudo, passwd)
This commit is contained in:
Dag Wieers
2012-11-23 17:52:55 +01:00
parent d1c285b70b
commit 7192eb3047
1 changed files with 13 additions and 4 deletions
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17
lib/ansible/runner/connection_plugins/ssh.py
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@@ -99,8 +99,17 @@ class Connection(object):
ssh_cmd.append(cmd)
vvv("EXEC %s" % ssh_cmd, host=self.host)
p = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
try:
# Make sure stdin is a proper (pseudo) pty to avoid: tcgetattr errors
import pty
master, slave = pty.openpty()
p = subprocess.Popen(ssh_cmd, stdin=slave,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdin = os.fdopen(master, 'w', 0)
except:
p = subprocess.Popen(ssh_cmd, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdin = p.stdin
self._send_password()
@@ -118,7 +127,7 @@ class Connection(object):
else:
stdout = p.communicate()
raise errors.AnsibleError('ssh connection error waiting for sudo password prompt')
p.stdin.write(self.runner.sudo_pass + '\n')
stdin.write(self.runner.sudo_pass + '\n')
fcntl.fcntl(p.stdout, fcntl.F_SETFL, fcntl.fcntl(p.stdout, fcntl.F_GETFL) & ~os.O_NONBLOCK)
# We can't use p.communicate here because the ControlMaster may have stdout open as well
@@ -133,7 +142,7 @@ class Connection(object):
break
elif p.poll() is not None:
break
p.stdin.close() # close stdin after we read from stdout (see also issue #848)
stdin.close() # close stdin after we read from stdout (see also issue #848)
if p.returncode != 0 and stdout.find('Bad configuration option: ControlPersist') != -1:
raise errors.AnsibleError('using -c ssh on certain older ssh versions may not support ControlPersist, set ANSIBLE_SSH_ARGS="" (or ansible_ssh_args in the config file) before running again')