da68447e
by Andrew Gregory at 2022-10-15T10:40:59-07:00
set bash env variables before running scripts
Bash sources user configuration files under a number of conditions that
can cause issues with scripts when bash is used as the scriptlet shell.
Bash assumes it's being run under rsh/ssh if stdin is connected to a
socket and sources the user bashrc unless the environment variable
$SHLVL is >= 2. Commit 6a4c6a02de9b45abe4c0f78c4f5d14d92d3359d6
switched from pipes to sockets when communicating with child processes
to work around SIGPIPE issues. Normally $SHLVL would be inherited from
the shell running pacman, but operations involving scriptlets are
generally run with sudo which does not let the $SHLVL variable through
unless specifically configured to.
Similarly $BASH_ENV can cause bash to source user-specified configuration
files if set.
https://lists.gnu.org/archive/html/help-bash/2022-02/msg00082.html
Note: the list discussion and bash source all reference SHLVL >= 2, this
is the SHLVL value *after* bash has incremented it on startup. Setting
it to 1 in pacman is sufficient to disable the unwanted behavior.
Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>