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#!/usr/bin/perl
#
# SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
# SPDX-License-Identifier: BSD-2-Clause
use v5.10; ## no critic qw(ValuesAndExpressions::ProhibitVersionStrings)
use strict;
use warnings;
use English qw(CHILD_ERROR ERRNO RS -no_match_vars);
use Fcntl ':mode';
use File::Basename;
use File::stat;
use Getopt::Std;
use POSIX ':sys_wait_h';
# We do pass a constant to `version->declare()`
## no critic qw(ValuesAndExpressions::RequireConstantVersion)
use version; our $VERSION = version->declare('0.4.2');
my $verbose = 0;
sub version() {
say "install-mimic $VERSION"
or die "Could not write to the standard output stream: $EVAL_ERROR\n";
return;
}
sub debug($) { ## no critic qw(Subroutines::RequireArgUnpacking)
return unless $verbose;
my ($msg) = @_;
return unless defined $msg && length $msg;
$msg =~ s/ \n* \Z //xms;
say $msg or die "Could not write to the standard error stream: $EVAL_ERROR\n";
return;
}
sub check_wait_result($ $ $) {
my ( $stat, $pid, $name ) = @_;
if ( WIFEXITED($stat) ) {
if ( WEXITSTATUS($stat) != 0 ) {
die "Program '$name' (pid $pid) exited with "
. 'non-zero status '
. WEXITSTATUS($stat) . "\n";
}
}
elsif ( WIFSIGNALED($stat) ) {
die "Program '$name' (pid $pid) was killed by signal " . WTERMSIG($stat) . "\n";
}
elsif ( WIFSTOPPED($stat) ) {
die "Program '$name' (pid $pid) was stopped by signal " . WSTOPSIG($stat) . "\n";
}
else {
die "Program '$name' (pid $pid) neither exited nor was "
. "it killed or stopped; what does wait(2) status $stat "
. "mean?!\n";
}
}
sub run_command(@) {
my @cmd = @_;
debug "@cmd";
my $pid = open my $pipe, q{-|};
if ( !defined $pid ) {
die "Could not fork for '@cmd': $ERRNO\n";
}
elsif ( $pid == 0 ) {
exec { $cmd[0] } @cmd;
die "Could not run '@cmd': $ERRNO\n";
}
my $output;
{
local $RS = undef;
$output = <$pipe>;
}
my $res = close $pipe;
my $msg = $ERRNO;
my $status = $CHILD_ERROR;
check_wait_result $status, $pid, "@cmd";
if ( !$res ) {
die "Some error occurred closing the pipe from '@cmd': $msg\n";
}
return $output;
}
sub install_mimic($ $; $) { ## no critic qw(ValuesAndExpressions::RequireInterpolationOfMetachars)
my ( $src, $dst, $ref ) = @_;
$ref //= $dst;
my $st = stat $ref
or die "Could not obtain information about $ref: $ERRNO\n";
my $res = run_command 'install', '-c', '-o', $st->uid, '-g', $st->gid,
'-m', sprintf( '%04o', S_IMODE( $st->mode ) ), $src, $dst;
debug $res;
return;
}
sub usage(;$) {
my ($err) = @_;
$err //= 1;
my $s = <<'EOUSAGE'
Usage: install-mimic [-v] [-r reffile] srcfile dstfile
install-mimic [-v] [-r reffile] file1 [file2...] directory
install-mimic -V | --version | -h | --help
install-mimic --features
-h display program usage information and exit
-V display program version information and exit
-r specify a reference file to obtain the information from
-v verbose operation; display diagnostic output
EOUSAGE
;
if ($err) {
die $s; ## no critic qw(ErrorHandling::RequireCarping)
}
else {
print "$s" or die "Could not write to the standard output stream: $EVAL_ERROR\n";
}
return;
}
MAIN:
{
my %opts;
getopts( 'hr:Vv-:', \%opts ) or usage;
my $version_flag = $opts{V};
my $help_flag = $opts{h};
my $features_flag;
if ( defined $opts{q{-}} ) {
if ( $opts{q{-}} eq 'features' ) {
$features_flag = 1;
}
elsif ( $opts{q{-}} eq 'help' ) {
$help_flag = 1;
}
elsif ( $opts{q{-}} eq 'version' ) {
$version_flag = 1;
}
else {
usage;
}
}
version if $version_flag;
usage 0 if $help_flag;
if ($features_flag) {
say "Features: install-mimic=$VERSION"
or die "Could not write to the standard output stream: $EVAL_ERROR\n";
}
exit 0 if $version_flag || $help_flag || $features_flag;
$verbose = $opts{v};
my $ref = $opts{r};
if ( @ARGV > 1 && -d $ARGV[-1] ) {
my $dir = pop @ARGV;
install_mimic $_, "$dir/" . basename($_), $ref for @ARGV;
}
elsif ( @ARGV == 2 ) {
install_mimic $ARGV[0], $ARGV[1], $ref;
}
else {
usage;
}
}
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