Subject: Package Paths Proposal v2
To: None <email@example.com>
From: Todd Vierling <firstname.lastname@example.org>
Date: 12/15/1998 09:46:54
Curt, considering I've completely butchered this, could you give me some
Here's the revised proposal.
1. /usr is designed to be shared amongst multiple machines of a single
architecture. Therefore, in the default configuration, files that are not
exactly the same for all machines of a single archtecture should not go
here, and files that are written other than at package installation
should not go here.
2. /var and /etc are local to the current machine. As per the hier(8)
manpage, /etc has configuration files and /var has log, temporary,
transient and spool files.
3. It must be possible to have the package system install files in a
separate area, where they are not mixed in with the standard system
1. The package tools will install things in $PREFIX, which defaults to
/usr/pkg. This will normally be a directory (created if it does not
a) The user may create $PREFIX as a symlink to /usr, causing packaged
binaries to be intermixed with the operating system files themselves.
This has some advantages, including that paths don't have to be
changed; users just use their usual paths to find the installed
packages. (cjs: In my personal experience, this would make it easier
to convert Linux users.)
b) Special packages, such as those intended to replace system binaries,
should install binaries in $PREFIX, rename the appropriate system
files to `file.old', and use symbolic links to point to the proper
paths in $PREFIX.
2. Files will be compiled to find their data, and installed, under $PREFIX
in bin, sbin, lib, libexec, libdata, share, as per hier(8). These would
then equate to paths such as /usr/pkg/bin, /usr/pkg/sbin, etc., for the
default case, and /usr/bin, /usr/sbin, /usr/lib, etc., for the intermix
3. Configuration files: Programs use configuration files from /etc (not
$PREFIX/etc) as the compiled-in default. Generally, subdirectories
(/etc/<pkgname>) should be created for packages that have more than one
or two config files. Sample configuration files should be placed in
$PREFIX/share/examples/<pkgname> (pkgname may be omitted if a single,
uniquely named config file is used). The general algorithm for
a) See if example config files exist in $PREFIX/share/examples. If they
do, rename them with a .old extension. (This facilitates a later
diff3(1) or merge(1) to see and deal with configuration options that
are new or changed when a package is upgraded.)
b) Install sample config files in $PREFIX/share/examples/<pkgname>.
c) See if `real' configuration files exist in $PREFIX/etc. If not,
copy the sample config set over to $PREFIX/etc.
d) See if `real' configuration files exist in /etc. If not, add
symlinks for each from /etc to their corresponding files in
4. A user may choose between shared and unshared configuration files at
a) If the user wishes to use shared config files, he/she should edit the
config file(s) in $PREFIX/etc. The previously installed symlinks
(see 3d) would take care of finding them at run-time.
b) If the user wishes to use unshared config files, se/she should remove
the symbolic link for the appropriate file(s) in /etc, and copy the
example file or config file from $PREFIX/etc to /etc. A file in
$PREFIX/etc will not be read by its program in this case.
5. Volatile files go in /var as per hier(4) and do NOT go in $PREFIX/var.
6. Startup scripts: daemons that start at boot time should have a start/stop
script available. This should be placed in $PREFIX/share/rc.d/<pkgname>.
It should accept the following arguments:
start: start the daemon
stop: stop the daemon
reload: reload configuration files
The `stop' item is so that the script can clean up things that the daemon
doesn't (such as /var/run/xntpd.pid, for xntpd) and the reload is so that
the script can do whatever is appropriate to make the server reread its
config files (send a sighup, stop and start for dhcpd, mysqladmin reload
for MySQL, etc.)
These should return a status code, but should not produce output except
in the case of an error. These scripts are likely to be called from
another program, though they may also be run directly by the user.
7. Package metadata: the files describing a package install (PLIST, etc.) go
in $PREFIX/libdata/pkgdb. That way if a package is installed on a one
system sharing /usr with others, it `appears' on the other systems (minus
config files and var files).
Notice that, unlike the current situation, things are set up for shared
systems by default, and it is a single step to turn that off. (Right now
it's several steps to put in symlinks to turn on sharing.) Keep this in mind
when suggesting changes.
-- Todd Vierling (Personal email@example.com; Bus. firstname.lastname@example.org)