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Introduce prefix_retain.conf to customize environment variables to keep #2

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Introduce prefix_retain.conf to customize environment variables to keep #2

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8 changes: 8 additions & 0 deletions prefix_retain.conf
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
# The environment variables that should be kept when entering prefix
# Example:
#
# WAYLAND_DISPLAY
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@black-desk black-desk Aug 29, 2025

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I think we should make these default.

# XDG_RUNTIME_DIR
#
# This will keep WAYLAND_DISPLAY and XDG_RUNTIME_DIR environment variables

8 changes: 8 additions & 0 deletions startprefix
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ export SHELL

# give a small notice
echo "Starting Gentoo Prefix shell ${SHELL}"
echo "Edit ${EPREFIX}/etc/prefix_retain.conf to add environment variables to keep"
echo "[exit the shell to deactivate Gentoo Prefix]"
# start the login shell, clean the entire environment but what's needed
RETAIN="HOME=$HOME TERM=$TERM USER=$USER SHELL=$SHELL"
Expand All @@ -69,6 +70,13 @@ if [[ -d /proc/registry ]]; then # we're on Cygwin
# some Windows programs (e.g. devenv.exe) need TMP or TEMP
[[ -n ${TEMP} ]] && RETAIN+=" TEMP=$TEMP"
fi

# Load user defined RETAIN variables
while IFS= read -r key; do
[[ -z "$key" || "$key" == \#* ]] && continue
RETAIN+=" $key=${!key}"
done < ${EPREFIX}/etc/prefix_retain.conf

# do it!
if [[ ${SHELL#${EPREFIX}} != ${SHELL} ]] ; then
'@GENTOO_PORTAGE_EENV@' -i $RETAIN $SHELL -l
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