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#!/usr/bin/perl -w
#
# $FreeBSD$
#
# Access control lists for CVS. dgg@ksr.com (David G. Grubbs)
#
# CVS "commitinfo" for matching repository names, running the program it finds
# on the same line. More information is available in the CVS man pages.
#
# ==== INSTALLATION:
#
# To use this program as I intended, do the following four things:
#
# 0. Install PERL. :-)
#
# 1. Put one line, as the *only* non-comment line, in your commitinfo file:
#
# DEFAULT /usr/local/bin/cvs_acls
#
# 2. Install this file as /usr/local/bin/cvs_acls and make it executable.
#
# 3. Create a file named $CVSROOT/CVSROOT/avail.
#
# ==== FORMAT OF THE avail FILE:
#
# The avail file determines whether you may commit files. It contains lines
# read from top to bottom, keeping track of a single "bit". The "bit"
# defaults to "on". It can be turned "off" by "unavail" lines and "on" by
# "avail" lines. ==> Last one counts.
#
# Any line not beginning with "avail" or "unavail" is ignored.
#
# Lines beginning with "avail" or "unavail" are assumed to be '|'-separated
# triples: (All spaces and tabs are ignored in a line.)
#
# {avail.*,unavail.*} [| user,user,... [| repos,repos,...]]
#
# 1. String starting with "avail" or "unavail".
# 2. Optional, comma-separated list of usernames.
# 3. Optional, comma-separated list of repository pathnames.
# These are pathnames relative to $CVSROOT. They can be directories or
# filenames. A directory name allows access to all files and
# directories below it.
#
# Example: (Text from the ';;' rightward may not appear in the file.)
#
# unavail ;; Make whole repository unavailable.
# avail|dgg ;; Except for user "dgg".
# avail|fred, john|bin/ls ;; Except when "fred" or "john" commit to
# ;; the module whose repository is "bin/ls"
#
# PROGRAM LOGIC:
#
# CVS passes to @ARGV an absolute directory pathname (the repository
# appended to your $CVSROOT variable), followed by a list of filenames
# within that directory.
#
# We walk through the avail file looking for a line that matches both
# the username and repository.
#
# A username match is simply the user's name appearing in the second
# column of the avail line in a space-or-comma separate list.
#
# A repository match is either:
# - One element of the third column matches $ARGV[0], or some
# parent directory of $ARGV[0].
# - Otherwise *all* file arguments ($ARGV[1..$#ARGV]) must be
# in the file list in one avail line.
# - In other words, using directory names in the third column of
# the avail file allows committing of any file (or group of
# files in a single commit) in the tree below that directory.
# - If individual file names are used in the third column of
# the avail file, then files must be committed individually or
# all files specified in a single commit must all appear in
# third column of a single avail line.
#
$debug = 0;
$die = '';
$cvsroot = $ENV{'CVSROOT'};
$availfile = $cvsroot . "/CVSROOT/avail";
$myname = $ENV{"USER"} if !($myname = $ENV{"LOGNAME"});
eval "print STDERR \$die='Unknown parameter $1\n' if !defined \$$1; \$$1=\$';"
while ($ARGV[0] =~ /^(\w+)=/ && shift(@ARGV));
exit 255 if $die; # process any variable=value switches
die "Must set CVSROOT\n" if !$cvsroot;
($repos = shift) =~ s:^$cvsroot/::;
grep($_ = $repos . '/' . $_, @ARGV);
print "$$ Repos: $repos\n","$$ ==== ",join("\n$$ ==== ",@ARGV),"\n" if $debug;
$exit_val = 0; # Good Exit value
$universal_off = 0;
open (AVAIL, $availfile) || exit(0); # It is ok for avail file not to exist
while (<AVAIL>) {
chop;
next if /^\s*\#/;
next if /^\s*$/;
($flagstr, $u, $m) = split(/[\s,]*\|[\s,]*/, $_);
# Skip anything not starting with "avail" or "unavail" and complain.
(print "Bad avail line: $_\n"), next
if ($flagstr !~ /^avail/ && $flagstr !~ /^unavail/);
# Set which bit we are playing with. ('0' is OK == Available).
$flag = (($& eq "avail") ? 0 : 1);
# If we find a "universal off" flag (i.e. a simple "unavail") remember it
$universal_off = 1 if ($flag && !$u && !$m);
# $myname considered "in user list" if actually in list or is NULL
$in_user = (!$u || grep ($_ eq $myname, split(/[\s,]+/,$u)));
print "$$ \$myname($myname) in user list: $_\n" if $debug && $in_user;
# Module matches if it is a NULL module list in the avail line. If module
# list is not null, we check every argument combination.
$in_repo = (!$m || 0);
if (!$in_repo) {
@tmp = split(/[\s,]+/,$m);
for $j (@tmp) {
# If the repos from avail is a parent(or equal) dir of $repos, OK
$in_repo = 1, last if ($repos eq $j || $repos =~ /^$j\//);
}
if (!$in_repo) {
#$in_repo = 1;
for $j (@ARGV) {
last if !($in_repo = grep ($_ eq $j, @tmp));
}
}
}
print "$$ \$repos($repos) in repository list: $_\n" if $debug && $in_repo;
$exit_val = $flag if ($in_user && $in_repo);
print "$$ ==== \$exit_val = $exit_val\n$$ ==== \$flag = $flag\n" if $debug;
}
close(AVAIL);
print "$$ ==== \$exit_val = $exit_val\n" if $debug;
print "**** Access denied: Insufficient Karma ($myname|$repos)\n" if $exit_val;
print "**** Access allowed: Personal Karma exceeds Environmental Karma.\n"
if $debug && $universal_off && !$exit_val;
exit($exit_val);
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