Patrick Bannister created CASSANDRA-14494:
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Summary: Investigate possibility of a cqlsh terminfo
Key: CASSANDRA-14494
URL: https://issues.apache.org/jira/browse/CASSANDRA-14494
Project: Cassandra
Issue Type: Sub-task
Environment: This behavior has been observed in xterm on CentOS 7.5
platforms. The test_cqlsh_output.py unit tests
(pylib/cqlshlib/test/test_cqlsh_output.py) are a good place to see it in action.
Reporter: Patrick Bannister
Fix For: 4.x
Summary: investigate whether we could use a cqlsh-specific terminfo file to
prevent use of the set-meta-mode escape sequence in xterm without breaking
colors. If it works, see if we can install it in an appropriate place using
Python distutils. If yes to both, generate a cqlsh terminfo file and work it
into the install process.
Long detailed explanation:
In some more recent environments, in Python REPL applications that use the
readline module, the set meta mode escape sequence is output before each
prompt. This escape sequence has caused problems for some applications, and in
our case, some of our cqlsh unit tests
(pylib/cqlshlib/test/test_cqlsh_output.py) choke on this output because of the
way our tests are designed to detect the cqlsh prompt. This behavior was
observed on a CentOS 7.5 platform.
The set-meta-mode escape sequence normally appears as "[?1034h" in output; it's
normally defined as the bytes 1b 5b 3f 31 30 33 34 68. The exact value of the
escape sequence is configurable and may be found on a GNU/Linux platform by
running the command:
{code:java}
tput smm | hexdump{code}
If this command gives no output, then the set meta mode sequence is not defined
on this platform for the terminal in use. Refer to the xterm and terminfo man
pages for more information on this sequence.
There are easier ways to solve this problem for the sake of the unit test, but
if time allows, I'd like to look into this to achieve a more consistent output
behavior for cqlsh on GNU/Linux platforms.
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