Re: nested escape chars in a shell command
I can't seem to get that to work either. child = pexpect.spawn('/bin/sh',args=['-c','/usr/bin/ssh','-t','-o','StrictHostKeyChecking no',host,command,'|','awk','{print %s:$0}'%host], timeout=30) Complains its getting the wrong arguments to ssh. Eli -- http://mail.python.org/mailman/listinfo/python-list
Re: nested escape chars in a shell command
I think you're mistaken about how 'sh -c' works. The next argument after -c is the script, and following arguments are the positional arguments. (what, you've never used -c in conjunction with positional arguments? me either!) Example: $ /bin/sh -c 'echo $#' a b c # i.e., a blank line $ /bin/sh -c 'echo $# 0=$0 1=$1 2=$2' a b c 2 0=a 1=b 2=c # i.e., a, b, c went to positional arguments Additionally, unless pexpect.spawn behaves differently than os.spawnv, -c is actually going to /bin/sh's argv[0], and you end up trying to execute /usr/bin/ssh as a shell script, which is probably not what you want! def shellquote(arg): # shell quoting technique I first read about on the 'git' development list # Everything is safely quoted inside a ''-quoted string, except a ' itself, # which can be written as '\'' (a backslash-escaped ' outside of the ''-quoted # string) return ' + arg.replace(', '\\'') + ' def shellquotelist(args): return .join([shellquote(arg) for arg in args]) # XXX: you may wish to assemle 'command' using shellquotelist too command1 = shellquotelist(['/bin/sh', '-c','/usr/bin/ssh','-t','-o', 'StrictHostKeyChecking no',host,command]) command2 = shellquotelist(['awk','{print %s:$0}'%host]) child = \ pexpect.spawn('/bin/sh', args=['/bin/sh', '-c', command1 + | + command2], timeout=30) Finally, in your case the use of awk would seem to be gratuitous. Instead, prepend the hostname to each line when you read the lines in. (this could easy or hard depending on the structure of the code where you read the output generated by child---if you do it with readline() or by iterating over the file, it is probably easy) Jeff pgp6UVusIacVl.pgp Description: PGP signature -- http://mail.python.org/mailman/listinfo/python-list
Re: nested escape chars in a shell command
Eli Criffield wrote: I'm try run an ssh command in pexpect and I'm having trouble getting everything escaped to do what i want. Here's a striped down script showing what i want to do. -- #!/usr/bin/env python import pexpect import sys if len(sys.argv) 3: print ssh.py host command sys.exit(1) host = sys.argv[1] command = sys.argv[2] child = pexpect.spawn('''sh -x -c stty -echo ; ssh -t -o 'StrictHostKeyChecking no' %s '%s' |awk '{print \%s:\$0}' '''%(host,command,host), timeout=30) child.setlog(sys.stdout) child.expect(pexpect.EOF) -- The problem in the pexpect.spawn line, It doesn't like the \%s:\ part of the awk command. This is necessary so i can see what server the command is running on, In the full script the command will be running on about 100 servers at a time. It parses out into: + stty -echo + ssh -t -o 'StrictHostKeyChecking no' testserver date + awk '{print testserver:$0}' It totally strips out the The stty -echo is required because part of what the program does is it tries to remember any passwords that are asked for, So you can run a command like su -c id and it will remember roots password for the next server and try that. -echo keeps the root password from being echoed to the screen. The second problem with the command is while su -c id works (taking out the awk part) running any command with more then one word after the -c in su fails, It strips out the ' like so: ./sshexpect testserver su -c 'ls -l /root' + stty -echo + ssh -t -o 'StrictHostKeyChecking no' testserver 'su -c ls' -l /root su: user /root does not exist I have tried every combination of escaping i can think of can i can't get either problem solved. Any ideas? Eli You can pass the argument list of your command to pexpect.spawn(comm, args=['arg1','arg2']) If the argument list is empty, pexpect tries to get the arguments from the comm you passed to it. I guess this gives you problems. Try using the args parameter. Simplest would be args=[' '] just to avoid the processing. -- http://mail.python.org/mailman/listinfo/python-list
nested escape chars in a shell command
I'm try run an ssh command in pexpect and I'm having trouble getting everything escaped to do what i want. Here's a striped down script showing what i want to do. -- #!/usr/bin/env python import pexpect import sys if len(sys.argv) 3: print ssh.py host command sys.exit(1) host = sys.argv[1] command = sys.argv[2] child = pexpect.spawn('''sh -x -c stty -echo ; ssh -t -o 'StrictHostKeyChecking no' %s '%s' |awk '{print \%s:\$0}' '''%(host,command,host), timeout=30) child.setlog(sys.stdout) child.expect(pexpect.EOF) -- The problem in the pexpect.spawn line, It doesn't like the \%s:\ part of the awk command. This is necessary so i can see what server the command is running on, In the full script the command will be running on about 100 servers at a time. It parses out into: + stty -echo + ssh -t -o 'StrictHostKeyChecking no' testserver date + awk '{print testserver:$0}' It totally strips out the The stty -echo is required because part of what the program does is it tries to remember any passwords that are asked for, So you can run a command like su -c id and it will remember roots password for the next server and try that. -echo keeps the root password from being echoed to the screen. The second problem with the command is while su -c id works (taking out the awk part) running any command with more then one word after the -c in su fails, It strips out the ' like so: ./sshexpect testserver su -c 'ls -l /root' + stty -echo + ssh -t -o 'StrictHostKeyChecking no' testserver 'su -c ls' -l /root su: user /root does not exist I have tried every combination of escaping i can think of can i can't get either problem solved. Any ideas? Eli -- http://mail.python.org/mailman/listinfo/python-list