/usr/share/perl5/FCM1/CfgFile.pm is in fcm 2016.12.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# (C) British Crown Copyright 2006-16 Met Office.
#
# This file is part of FCM, tools for managing and building source code.
#
# FCM is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FCM is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with FCM. If not, see <http://www.gnu.org/licenses/>.
# ------------------------------------------------------------------------------
# NAME
# FCM1::CfgFile
#
# DESCRIPTION
# This class is used for reading and writing FCM config files. A FCM config
# file is a line-based text file that provides information on how to perform
# a particular task using the FCM system.
#
# ------------------------------------------------------------------------------
package FCM1::CfgFile;
@ISA = qw(FCM1::Base);
# Standard pragma
use warnings;
use strict;
# Standard modules
use Carp;
use File::Basename;
use File::Path;
use File::Spec;
# FCM component modules
use FCM1::Base;
use FCM1::CfgLine;
use FCM1::Config;
use FCM1::Keyword;
use FCM1::Util;
# List of property methods for this class
my @scalar_properties = (
'actual_src', # actual source of configuration file
'lines', # list of lines, FCM1::CfgLine objects
'pegrev', # peg revision of configuration file
'src', # source of configuration file
'type', # type of configuration file
'version', # version of configuration file
);
# ------------------------------------------------------------------------------
# SYNOPSIS
# $obj = FCM1::CfgFile->new (%args);
#
# DESCRIPTION
# This method constructs a new instance of the FCM1::CfgFile class. See above
# for allowed list of properties. (KEYS should be in uppercase.)
# ------------------------------------------------------------------------------
sub new {
my $this = shift;
my %args = @_;
my $class = ref $this || $this;
my $self = FCM1::Base->new (%args);
bless $self, $class;
for (@scalar_properties) {
$self->{$_} = exists $args{uc ($_)} ? $args{uc ($_)} : undef;
}
return $self;
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# $value = $obj->X;
# $obj->X ($value);
#
# DESCRIPTION
# Details of these properties are explained in @scalar_properties.
# ------------------------------------------------------------------------------
for my $name (@scalar_properties) {
no strict 'refs';
*$name = sub {
my $self = shift;
if (@_) {
$self->{$name} = $_[0];
}
if (not defined $self->{$name}) {
if ($name eq 'lines') {
$self->{$name} = [];
}
}
return $self->{$name};
}
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# $mtime = $obj->mtime ();
#
# DESCRIPTION
# This method returns the modified time of the configuration file source.
# ------------------------------------------------------------------------------
sub mtime {
my $self = shift;
my $mtime = undef;
if (-f $self->src) {
$mtime = (stat $self->src)[9];
}
return $mtime;
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# $read = $obj->read_cfg($is_for_inheritance);
#
# DESCRIPTION
# This method reads the current configuration file. It returns the number of
# lines read from the config file, or "undef" if it fails. The result is
# placed in the LINES array of the current instance, and can be accessed via
# the "lines" method.
# ------------------------------------------------------------------------------
sub read_cfg {
my ($self, $is_for_inheritance) = @_;
my @lines = $self->_get_cfg_lines($is_for_inheritance);
# List of CFG types that need INC declarations expansion
my %exp_inc = ();
for (split (/$FCM1::Config::DELIMITER_LIST/, $self->setting ('CFG_EXP_INC'))) {
$exp_inc{uc ($_)} = 1;
}
# List of CFG labels that are reserved keywords
my %cfg_keywords = ();
for (split (/$FCM1::Config::DELIMITER_LIST/, $self->setting ('CFG_KEYWORD'))) {
$cfg_keywords{$self->cfglabel ($_)} = 1;
}
# Loop each line, to separate lines into label : value pairs
my $cont = undef;
my $here = undef;
for my $line_num (1 .. @lines) {
my $line = $lines[$line_num - 1];
chomp $line;
my $label = '';
my $value = '';
my $comment = '';
# If this line is a continuation, set $start to point to the line that
# starts this continuation. Otherwise, set $start to undef
my $start = defined ($cont) ? $self->lines->[$cont] : undef;
my $warning = undef;
if ($line =~ /^(\s*#.*)$/) { # comment line
$comment = $1;
} elsif ($line =~ /\S/) { # non-blank line
if (defined $cont) {
# Previous line has a continuation mark
$value = $line;
# Separate value and comment
if ($value =~ s/((?:\s+|^)#\s+.*)$//) {
$comment = $1;
}
# Remove leading spaces
$value =~ s/^\s*\\?//;
# Expand environment variables
my $warn;
($value, $warn) = $self->_expand_variable ($value, 1) if $value;
$warning .= ($warning ? ', ' : '') . $warn if $warn;
# Expand internal variables
($value, $warn) = $self->_expand_variable ($value, 0) if $value;
$warning .= ($warning ? ', ' : '') . $warn if $warn;
# Get "line" that begins the current continuation
my $v = $start->value . $value;
$v =~ s/\\$//;
$start->value ($v);
} else {
# Previous line does not have a continuation mark
if ($line =~ /^\s*(\S+)(?:\s+(.*))?$/) {
# Check line contains a valid label:value pair
$label = $1;
$value = defined ($2) ? $2 : '';
# Separate value and comment
if ($value =~ s/((?:\s+|^)#\s+.*)$//) {
$comment = $1;
}
# Remove trailing spaces
$value =~ s/\s+$//;
# Value begins with $HERE?
$here = ($value =~ /\$\{?HERE\}?(?:[^A-Z_]|$)/);
# Expand environment variables
my $warn;
($value, $warn) = $self->_expand_variable ($value, 1) if $value;
$warning .= ($warning ? ', ' : '') . $warn if $warn;
# Expand internal variables
($value, $warn) = $self->_expand_variable ($value, 0) if $value;
$warning .= ($warning ? ', ' : '') . $warn if $warn;
}
}
# Determine whether current line ends with a continuation mark
if ($value =~ s/\\$//) {
$cont = scalar (@{ $self->lines }) unless defined $cont;
} else {
$cont = undef;
}
}
if ( defined($self->type())
&& exists($exp_inc{uc($self->type())})
&& uc($start ? $start->label() : $label) eq $self->cfglabel('INC')
&& !defined($cont)
) {
# Current configuration file requires expansion of INC declarations
# The start/current line is an INC declaration
# The current line is not a continuation or is the end of the continuation
# Get lines from an "include" configuration file
my $src = ($start ? $start->value : $value);
$src .= '@' . $self->pegrev if $here and $self->pegrev;
if ($src) {
# Invoke a new instance to read the source
my $cfg = FCM1::CfgFile->new (
SRC => expand_tilde ($src), TYPE => $self->type,
);
$cfg->read_cfg;
# Add lines to the lines array in the current configuration file
$comment = 'INC ' . $src . ' ';
push @{$self->lines}, FCM1::CfgLine->new (
comment => $comment . '# Start',
number => ($start ? $start->number : $line_num),
src => $self->actual_src,
warning => $warning,
);
push @{ $self->lines }, @{ $cfg->lines };
push @{$self->lines}, FCM1::CfgLine->new (
comment => $comment . '# End',
src => $self->actual_src,
);
} else {
push @{$self->lines}, FCM1::CfgLine->new (
number => $line_num,
src => $self->actual_src,
warning => 'empty INC declaration.'
);
}
} else {
# Push label:value pair into lines array
push @{$self->lines}, FCM1::CfgLine->new (
label => $label,
value => ($label ? $value : ''),
comment => $comment,
number => $line_num,
src => $self->actual_src,
warning => $warning,
);
}
next if defined $cont; # current line not a continuation
my $slabel = ($start ? $start->label : $label);
my $svalue = ($start ? $start->value : $value);
next unless $slabel;
# Check config file type and version
if (index (uc ($slabel), $self->cfglabel ('CFGFILE')) == 0) {
my @words = split /$FCM1::Config::DELIMITER_PATTERN/, $slabel;
shift @words;
my $name = @words ? lc ($words[0]) : 'type';
if ($self->can ($name)) {
$self->$name ($svalue);
}
}
# Set internal variable
$slabel =~ s/^\%//; # Remove leading "%" from label
$self->config->variable ($slabel, $svalue)
unless exists $cfg_keywords{$slabel};
}
# Report and reset warnings
# ----------------------------------------------------------------------------
for my $line (@{ $self->lines }) {
w_report $line->format_warning if $line->warning;
$line->warning (undef);
}
return @{ $self->lines };
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# $rc = $obj->print_cfg ($file, [$force]);
#
# DESCRIPTION
# This method prints the content of current configuration file. If no
# argument is specified, it prints output to the standard output. If $file is
# specified, and is a writable file name, the output is sent to the file. If
# the file already exists, its content is compared to the current output.
# Nothing will be written if the content is unchanged unless $force is
# specified. Otherwise, for typed configuration files, the existing file is
# renamed using a prefix that contains its last modified time. The method
# returns 1 if there is no error.
# ------------------------------------------------------------------------------
sub print_cfg {
my ($self, $file, $force) = @_;
# Count maximum number of characters in the labels, (for pretty printing)
my $max_label_len = 0;
for my $line (@{ $self->lines }) {
next unless $line->label;
my $label_len = length $line->label;
$max_label_len = $label_len if $label_len > $max_label_len;
}
# Output string
my $out = '';
# Append each line of the config file to the output string
for my $line (@{ $self->lines }) {
$out .= $line->print_line ($max_label_len - length ($line->label) + 1);
$out .= "\n";
}
if ($out) {
my $out_handle = select();
# Open file if necessary
if ($file) {
# Make sure the host directory exists and is writable
my $dirname = dirname $file;
if (not -d $dirname) {
print 'Make directory: ', $dirname, "\n" if $self->verbose;
mkpath $dirname;
}
croak $dirname, ': cannot write to config file directory, abort'
unless -d $dirname;
if (-f $file and not $force) {
# Read old config file to see if content has changed
open(my $handle, '<', $file) || croak("$file: $!\n");
my $in_lines = '';
while (my $line = readline($handle)) {
$in_lines .= $line;
}
close($handle);
# Return if content is up-to-date
if ($in_lines eq $out) {
print 'No change in ', lc ($self->type), ' cfg: ', $file, "\n"
if $self->verbose > 1 and $self->type;
return 1;
}
# If config file already exists, make sure it is writable
if ($self->type) {
# Existing config file writable, rename it using its time stamp
my $mtime = (stat $file)[9];
my ($sec, $min, $hour, $mday, $mon, $year) = (gmtime $mtime)[0 .. 5];
my $timestamp = sprintf '%4d%2.2d%2.2d_%2.2d%2.2d%2.2d_',
$year + 1900, $mon + 1, $mday, $hour, $min, $sec;
my $oldfile = File::Spec->catfile (
$dirname, $timestamp . basename ($file)
);
rename $file, $oldfile;
print 'Rename existing ', lc ($self->type), ' cfg: ',
$oldfile, "\n" if $self->verbose > 1;
}
}
# Open file and select file handle
open(my $handle, '>', $file) || croak("$file: $!\n");
$out_handle = $handle;
}
# Print output
print($out_handle $out);
# Close file if necessary
if ($file) {
close($out_handle) || croak("$file: $!\n");
if ($self->type and $self->verbose > 1) {
print 'Generated ', lc ($self->type), ' cfg: ', $file, "\n";
} elsif ($self->verbose > 2) {
print 'Generated cfg: ', $file, "\n";
}
}
} else {
# Warn if nothing to print
my $warning = 'Empty configuration';
$warning .= ' - nothing written to file: ' . $file if $file;
carp $warning if $self->type;
}
return 1;
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# @lines = $self->_get_cfg_lines($is_for_inheritance);
#
# DESCRIPTION
# This internal method opens the configuration file and returns its contents
# as an array of lines. If the $self->src() is given as a URI, the method
# tries to read it with "svn cat". Otherwise, the method tries to read
# $self->src() with open() and readline(). If $self->type() is not a known
# type, $self->src() can only be a regular file and $is_for_inheritance is
# ignored. Otherwise, $self->src() can be a regular file or a directory and
# $is_for_inheritance is used to determine the behaviour for searching the
# directory for a configuration file. If $is_for_inheritance is set, the
# config file may be located at "$src/cfg/$type.cfg". If $is_for_inheritance
# is not set, the config file may be located at "$src/$type.cfg" or
# "$src/cfg/$type.cfg".
# ------------------------------------------------------------------------------
sub _get_cfg_lines {
my ($self, $is_for_inheritance) = @_;
my $DIAG = sub {};
my @paths_refs = ([]);
if ($self->type() && exists($self->setting('CFG_NAME')->{uc($self->type())})) {
my $base = $self->setting('CFG_NAME')->{uc($self->type())};
if (!$is_for_inheritance) {
push(@paths_refs, [$base]);
}
push(@paths_refs, [$self->setting(qw/DIR CFG/), $base]);
if ($self->verbose()) {
$DIAG = sub {printf("Config file (%s): %s\n", $self->type(), @_)};
}
}
if ($self->src() =~ qr{\A([A-Za-z][\w\+-\.]*):}xms) {
# $self->src() is a URI, try "svn cat"
my $src = FCM1::Util::tidy_url(FCM1::Keyword::expand($self->src()));
my ($uri, $rev) = $src =~ qr{\A(.+?)(?:\@([^\@]+))?\z}msx;
$rev ||= 'HEAD';
for my $paths_ref (@paths_refs) {
my $path = join('/', $uri, @{$paths_ref}) . '@' . $rev;
local($@);
my @lines = eval {
run_command([qw/svn cat/, $path], METHOD => 'qx', DEVNULL => 1);
};
if (!$@) {
$self->pegrev($rev);
$self->actual_src($path);
$DIAG->($path);
return @lines;
}
}
}
else {
# $self->src() is not a URI, assume that it resides in the file system
for my $paths_ref (@paths_refs) {
my $path = File::Spec->catfile($self->src(), @{$paths_ref});
if (-e $path && !-d $path) { # "-f $path" returns false for "/dev/null"
open(my $handle, '<', $path)
|| croak("$path: cannot open config file, abort: $!");
my @lines = readline($handle);
close($handle);
$self->actual_src($path);
$DIAG->($path);
return @lines;
}
}
}
croak(sprintf("%s: cannot locate config file, abort", $self->src()));
}
# ------------------------------------------------------------------------------
# SYNOPSIS
# $string = $self->_expand_variable ($string, $env[, \%recursive_set]);
#
# DESCRIPTION
# This internal method expands variables in $string. If $env is true, it
# expands environment variables. Otherwise, it expands local variables. If
# %recursive_set is specified, it indicates that this method is being called
# recursively. In which case, it must not attempt to expand a variable that
# exists in the keys of %recursive_set.
# ------------------------------------------------------------------------------
sub _expand_variable {
my ($self, $string, $env, $recursive_set_ref) = @_;
# Pattern for environment/local variable
my @patterns = $env
? (qr#\$([A-Z][A-Z0-9_]+)#, qr#\$\{([A-Z][A-Z0-9_]+)\}#)
: (qr#%(\w+(?:::[\w\.-]+)*)#, qr#%\{(\w+(?:(?:::|/)[\w\.-]+)*)\}#);
my $ret = '';
my $warning = undef;
while ($string) {
# Find the first match in $string
my ($prematch, $match, $postmatch, $var_label);
for my $pattern (@patterns) {
next unless $string =~ /$pattern/;
if ((not defined $prematch) or length ($`) < length ($prematch)) {
$prematch = $`;
$match = $&;
$var_label = $1;
$postmatch = $';
}
}
if ($match) {
$ret .= $prematch;
$string = $postmatch;
# Get variable value from environment or local configuration
my $variable = $env
? (exists $ENV{$var_label} ? $ENV{$var_label} : undef)
: $self->config->variable ($var_label);
if ($env and $var_label eq 'HERE' and not defined $variable) {
$variable = dirname ($self->actual_src);
$variable = File::Spec->rel2abs ($variable) if not &is_url ($variable);
}
# Substitute match with value of variable
if (defined $variable) {
my %set = (($recursive_set_ref ? %{$recursive_set_ref} : ()));
if (exists($set{$var_label})) {
$warning .= ', ' if $warning;
$warning .= $match . ': cyclic dependency, variable not expanded';
$ret .= $variable;
} else {
my ($r, $w)
= $self->_expand_variable($variable, $env, {%set, $var_label => 1});
$ret .= $r;
if ($w) {
$warning .= ', ' if $warning;
$warning .= $w;
}
}
} else {
$warning .= ', ' if $warning;
$warning .= $match . ': variable not expanded';
$ret .= $match;
}
} else {
$ret .= $string;
$string = "";
}
}
return ($ret, $warning);
}
1;
__END__
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