toolchain/55257: make and bmake do not work with paths beginning with tildes on variables defined on mk.conf

[joaopaulo1511%hotmail.com@localhost]

>Number:         55257
>Category:       toolchain
>Synopsis:       make and bmake do not work with paths beginning with tildes on variables defined on mk.conf
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    toolchain-manager
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 13 03:30:00 +0000 2020
>Originator:     João Paulo Vinha Bittar
>Release:        9.0
>Organization:
home user
>Environment:
NetBSD localhost 9.0 NetBSD 9.0 (GENERIC) #0: Fri Feb 14 00:06:28 UTC 2020 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC i386
>Description:
If /etc/mk.conf or ~/pkg/etc/mk.conf have beginning tildes on variables, make and bmake throws a message that the directory could not be written.

For example, if WRKOBJDIR=~/WORK instead of WRKOBJDIR=$HOME/WORK, or if DISTDIR=~/DISTFILES instead of DISTDIR=/home/my_name/DISTFILES, or if PACKAGES=~/PACKAGES instead of PACKAGES=${HOME}/PACKAGES, make and bmake cannot fetch the source files, nor build packages neither store the packages built, as they cannot write to paths begining with tildes.

The manual page at https://netbsd.gw.com/cgi-bin/man-cgi?mk.conf+5+NetBSD-current does not say that mk.conf should not have tildes on beginning of paths and the user should use the $HOME or ${HOME} or the full path.
>How-To-Repeat:
1. On a system with NetBSD and pkgsrc installed, run "/usr/pkgsrc/bootstrap/bootstrap --unprivileged" so bmake can be tested.  Add ~/pkg/bin:~/pkg/sbin to your PATH environment variable.

2. Edit /mk.conf and ~/pkg/etc/mk.conf to define variables as WRKOBJDIR, DISTDIR and PACKAGES to contain paths beginning with tildes, such as WRKOBJDIR=~/WORK, DISTDIR=~/DISTFILES and PACKAGES=~/PACKAGES.

3. Try to build any package as root with make or as non-root with bmake:  They will throw an error they could not write to those paths beginning with tildes.
>Fix:
I do not think there is any need to fix the make and bmake binaries, as we can use $HOME or ${HOME} instead of tildes, as in WRKOBJDIR=$HOME/WORK.

However, the manual page for mk.conf (https://netbsd.gw.com/cgi-bin/man-cgi?mk.conf+5+NetBSD-current) should tell the user to not use tildes and use $HOME on mk.conf, be it at /etc/mk.conf or at ~/pkg/etc/mk.conf.