[OE-core] [PATCH 1/2] python: fix importing readline with probably escape sequence output

[Hongxu Jia]

While imports readline in python, if TERM in terminfo is available and
it contains the variable 'km' and 'smm', the readline initialization will
output the value of 'smm' which is the escape sequence '\E[?1034h'.

'km' means the terminal has a meta key which is a special key on MIT keyboards
such as the space-cadet keyboard, and on Sun Microsystems keyboards, marked
as a solid diamond. It almost doesn't exist in our keyboard, so it has no side
effect to disable it.
'smm' means turn on the meta key if this terminal has one.

Explicitly set meta key off to avoid probable escape sequence output
while gnu readline library initialization.

[YOCTO #4835]
[YOCTO #4732]

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta/recipes-devtools/python/python.inc            |  4 +-
 ...-to-avoid-probable-escape-sequence-output.patch | 43 ++++++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-devtools/python/python/readline-set-meta-key-off-to-avoid-probable-escape-sequence-output.patch

diff --git a/meta/recipes-devtools/python/python.inc b/meta/recipes-devtools/python/python.inc
index 80609a8..9f787c9 100644
--- a/meta/recipes-devtools/python/python.inc
+++ b/meta/recipes-devtools/python/python.inc
@@ -7,7 +7,9 @@ INC_PR = "r0"
 
 LIC_FILES_CHKSUM = "file://LICENSE;md5=ed3abfd1059e2d3a36a8cff3986f9bb6"
 
-SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.bz2"
+SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.bz2 \
+           file://readline-set-meta-key-off-to-avoid-probable-escape-sequence-output.patch \
+"
  
 SRC_URI[md5sum] = "c57477edd6d18bd9eeca2f21add73919"
 SRC_URI[sha256sum] = "726457e11cb153adc3f428aaf1901fc561a374c30e5e7da6742c0742a338663c"
diff --git a/meta/recipes-devtools/python/python/readline-set-meta-key-off-to-avoid-probable-escape-sequence-output.patch b/meta/recipes-devtools/python/python/readline-set-meta-key-off-to-avoid-probable-escape-sequence-output.patch
new file mode 100644
index 0000000..104fc36
--- /dev/null
+++ b/meta/recipes-devtools/python/python/readline-set-meta-key-off-to-avoid-probable-escape-sequence-output.patch
@@ -0,0 +1,43 @@
+readline:explicitly set meta key off to avoid probable escape sequence output
+
+While imports readline in python, if TERM in terminfo is available and
+it contains the variable 'km' and 'smm', the readline initialization will
+output the value of 'smm' which is the escape sequence '\E[?1034h'.
+
+'km' means the terminal has a meta key which is a special key on MIT keyboards
+such as the space-cadet keyboard, and on Sun Microsystems keyboards, marked
+as a solid diamond. It almost doesn't exist in our keyboard, so it has no side
+effect to disable it.
+'smm' means turn on the meta key if this terminal has one.
+
+Explicitly set meta key off to avoid probable escape sequence output
+while gnu readline library initialization.
+
+Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
+Upstream-Status: inappropriate [oe specific]
+---
+ Modules/readline.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/Modules/readline.c b/Modules/readline.c
+--- a/Modules/readline.c
++++ b/Modules/readline.c
+@@ -909,6 +909,15 @@ setup_readline(void)
+ 	rl_read_init_file(NULL);
+     else
+ #endif /* __APPLE__ */
++
++    /* Explicitly set meta key off to avoid probable escape sequence output
++     * while gnu readline library initialization. The meta key is a special
++     * key in MIT keyboards such as the space-cadet keyboard, and on Sun
++     * Microsystems keyboards, marked as a solid diamond. It almost doesn't
++     * exist in our keyboards, so it has no side effect to disable it.
++     */
++    rl_variable_bind("enable-meta-key", "off");
++
+         rl_initialize();
+     
+     RESTORE_LOCALE(saved_locale)
+-- 
+1.8.1.2
+
-- 
1.8.1.2