install/59008: set $ENV in the default skel/dot.cshrc as dot.profile

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         59008
>Category:       install
>Synopsis:       set $ENV in the default skel/dot.cshrc as dot.profile
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 19 08:10:00 +0000 2025
>Originator:     Izumi Tsutsui
>Release:        NetBSD 10.1
>Organization:
>Environment:
System: NetBSD mirage 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC i386
Architecture: all
Machine: all
>Description:
The default root shell has been changed from /bin/csh to /bin/sh
since 2012:
 https://github.com/NetBSD/src/commit/a1da65bd

However if a user's shell is /bin/csh (or /usr/pkg/bin/tcsh)
and the user uses the default skel/dot.cshrc, it doesn't set
$ENV to configure sh(1) to load .shrc at every startup,
not just login shells.

Then all csh users have to enter ". /etc/shrc" etc. to enable
line editing (set -o emacs) and file completion (set -o tabcomplete)
on using su(1) to root or invoking sh(1) prompt manually.

This change (to set $ENV in dot.cshrc as dot.profile does)
solves such annoying situation.

>How-To-Repeat:
See above.

>Fix:
Just add $ENV settings in interactive case in src/etc/skel/dot.cshrc:

diff --git a/etc/skel/dot.cshrc b/etc/skel/dot.cshrc
index 3a3e4037e1e3..4d2705543f09 100644
--- a/etc/skel/dot.cshrc
+++ b/etc/skel/dot.cshrc
@@ -62,4 +62,7 @@ if ($?prompt) then
 	# Set the prompt to include the hostname.
 	set mch = `hostname -s`
 	set prompt = "${mch:q}: {\!} "
+
+	# Configure the shell (on su(1) etc.) to load .shrc at startup time.
+	setenv ENV ~/.shrc
 endif

---
Izumi Tsutsui