+#!/usr/bin/perl -- # -*-Perl-*-
+#
+# cvs_acls.pl,v 1.2 1992/04/11 16:01:24 berliner Exp
+#
+# 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;
+$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 && $in_user;
+
+ # Module matches if it is a NULL module list in the avail line. If module
+ # list is not null, we check every argument combination.
+ if (!($in_repo = !$m)) {
+ @tmp = split(/[\s,]+/,$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 $universal_off && !$exit_val;
+exit($exit_val);
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