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base-files/profile: Add universal resize function

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Using an editor or any kind of command line that wraps beyond the
column width of the session on a serial port is quite problematic
unless you are using an 80x24 session.

The original /etc/profile tried to use the resize binary if it was
available.  The problem is that you only get the resize binary if
xterm, or busybox is installed.

This updated /etc/profile will add a resize function available to the
shell when no xterm or busybox resize binary is found.  More care is
taken in this new version to test that terminal is interactive.  The
EDITOR and SHLVL environment variables are checked to prevent resize
from running necessarily.

The function definitions are not indented intentionally to keep them
to the 80 column width.

(From OE-Core rev: 3743892996172c8595a1cbe884c4a0e6ef50dcda)

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Jason Wessel
2020-11-02 14:28:51 -08:00
committed by Richard Purdie
parent 3bbe49bc02
commit 017cdf751d
1 changed files with 41 additions and 7 deletions
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48
meta/recipes-core/base-files/base-files/profile
View File

@@ -2,7 +2,6 @@
# and Bourne compatible shells (bash(1), ksh(1), ash(1), ...).
PATH="/usr/local/bin:/usr/bin:/bin"
EDITOR="vi" # needed for packages like cron, git-commit
[ "$TERM" ] || TERM="vt100" # Basic terminal capab. For screen etc.
# Add /sbin & co to $PATH for the root user
@@ -20,13 +19,48 @@ if [ -d /etc/profile.d ]; then
unset i
fi
# Make sure we are on a serial console (i.e. the device used starts with
# /dev/tty[A-z]), otherwise we confuse e.g. the eclipse launcher which tries do
# use ssh
case $(tty 2>/dev/null) in
/dev/tty[A-z]*) [ -x @BINDIR@/resize ] && @BINDIR@/resize >/dev/null;;
esac
if [ -t 0 -a $# -eq 0 ]; then
if [ ! -x @BINDIR@/resize ] ; then
if [ -n "$BASH_VERSION" ] ; then
# Optimized resize funciton for bash
resize() {
local x y
IFS='[;' read -t 2 -p $(printf '\e7\e[r\e[999;999H\e[6n\e8') -sd R _ y x _
[ -n "$y" ] && \
echo -e "COLUMNS=$x;\nLINES=$y;\nexport COLUMNS LINES;" && \
stty cols $x rows $y
}
else
# Portable resize function for ash/bash/dash/ksh
# with subshell to avoid local variables
resize() {
(o=$(stty -g)
stty -echo raw min 0 time 2
printf '\0337\033[r\033[999;999H\033[6n\0338'
if echo R | read -d R x 2> /dev/null; then
IFS='[;R' read -t 2 -d R -r z y x _
else
IFS='[;R' read -r _ y x _
fi
stty "$o"
[ -z "$y" ] && y=${z##*[}&&x=${y##*;}&&y=${y%%;*}
[ -n "$y" ] && \
echo "COLUMNS=$x;"&&echo "LINES=$y;"&&echo "export COLUMNS LINES;"&& \
stty cols $x rows $y)
}
fi
fi
# Use the EDITOR not being set as a trigger to call resize
# and only do this for /dev/tty[A-z] which are typically
# serial ports
if [ -z "$EDITOR" -a "$SHLVL" = 1 ] ; then
case $(tty 2>/dev/null) in
/dev/tty[A-z]*) resize >/dev/null;;
esac
fi
fi
EDITOR="vi" # needed for packages like cron, git-commit
export PATH PS1 OPIEDIR QPEDIR QTDIR EDITOR TERM
umask 022