the owner of all installed files is a non-root user. This change
affects most packages that require special users or groups by making
them use the specified unprivileged user and group instead.
(1) Add two new variables PKG_GROUPS_VARS and PKG_USERS_VARS to
unprivileged.mk. These two variables are lists of other bmake
variables that define package-specific users and groups. Packages
that have user-settable variables for users and groups, e.g. apache
and APACHE_{USER,GROUP}, courier-mta and COURIER_{USER,GROUP},
etc., should list these variables in PKG_USERS_VARS and PKG_GROUPS_VARS
so that unprivileged.mk can know to set them to ${UNPRIVILEGED_USER}
and ${UNPRIVILEGED_GROUP}.
(2) Modify packages to use PKG_GROUPS_VARS and PKG_USERS_VARS.
Packages may set PKG_DESTDIR_SUPPORT to either "destdir" or
"user-destdir" to flag support for this, following the same
rules as PKG_INSTALLATION_TYPES (e.g. define before first include
of bsd.prefs.mk).
The user activates it via USE_DESTDIR. When set to "yes",
packages with "user-destdir" are handled as "destdir".
The installation of the package will not go to ${LOCALBASE},
but a subdirectory of ${WRKDIR} instead. pre/post install scripts are
not run and the package is not registered either. A binary package
can be created instead to be installed normally with pkg_add.
For "user-destdir" packages, everything is run as normal user and
ownership is supposed to be correctled by pkg_create later. Since
the current pkg_install code uses pax and it doesn't allow overwriting
owners, this does not work yet.
For "destdir" packages, installation, packaging and cleaning is run as
root.
This commit does not change the handling of DEPENDS_TARGET or
bin-install to allow recursive usage.
