#!/usr/bin/perl

=head1 NAME

dh_install - install files into package build directories

=cut

use strict;
use warnings;
use Debian::Debhelper::Dh_Lib;

our $VERSION = DH_BUILTIN_VERSION;

=head1 SYNOPSIS

B<dh_install> [B<-X>I<item>] [B<--autodest>] [B<--sourcedir=>I<dir>] [S<I<debhelper options>>] [S<I<file|dir> ... I<destdir>>]

=head1 DESCRIPTION

B<dh_install> is a debhelper program that handles installing files into package
build directories. There are many B<dh_install>I<*> commands that handle installing
specific types of files such as documentation, examples, man pages, and so on,
and they should be used when possible as they often have extra intelligence for
those particular tasks. B<dh_install>, then, is useful for installing everything
else, for which no particular intelligence is needed. It is a replacement for
the old B<dh_movefiles> command.

This program may be used in one of two ways. If you just have a file or two
that the upstream Makefile does not install for you, you can run B<dh_install>
on them to move them into place. On the other hand, maybe you have a large
package that builds multiple binary packages. You can use the upstream
F<Makefile> to install it all into F<debian/tmp>, and then use B<dh_install> to copy
directories and files from there into the proper package build directories.

From debhelper compatibility level 7 on, B<dh_install> will fall back to
looking in F<debian/tmp> for files, if it does not find them in the current
directory (or wherever you've told it to look using B<--sourcedir>).

=head1 FILES

=over 4

=item debian/I<package>.install

List the files to install into each package and the directory they should be
installed to. The format is a set of lines, where each line lists a file or
files to install, and at the end of the line tells the directory it should be
installed in. The name of the files (or directories) to install should be given
relative to the current directory, while the installation directory is given
relative to the package build directory. You may use wildcards in the names of
the files to install.

Note that if you list exactly one filename or wildcard-pattern on a line by
itself, with no explicit destination, then B<dh_install>
will automatically guess the destination to use, the same as if the
--autodest option were used.

Supports substitution variables in compat 13 and later as
documented in L<debhelper(7)>.

=item debian/not-installed

Used with the deprecated B<--list-missing> and B<--fail-missing> options.
Please refer to L<dh_missing(1)> for the documentation of this file.

=back

=head1 OPTIONS

=over 4

=item B<--list-missing>

B<Deprecated>: Please use B<dh_missing --list-missing> instead.  If you use
this option, B<dh_install> will call B<dh_missing> with that option after it has
processed all the files.  Please see L<dh_missing(1)> for the documentation of
this option.

This option is removed in compat 12.

=item B<--fail-missing>

B<Deprecated>: Please use B<dh_missing --fail-missing> instead.  If you use
this option, B<dh_install> will call B<dh_missing> with that option after it has
processed all the files.  Please see L<dh_missing(1)> for the documentation of
this option.

This option is removed in compat 12.

=item B<--sourcedir=>I<dir>

Look in the specified directory for files to be installed.

Note that this is not the same as the B<--sourcedirectory> option used
by the B<dh_auto_>I<*> commands. You rarely need to use this option, since
B<dh_install> automatically looks for files in F<debian/tmp> in debhelper
compatibility level 7 and above.

=item B<--autodest>

Guess as the destination directory to install things to. If this is
specified, you should not list destination directories in
F<debian/package.install> files or on the command line. Instead, B<dh_install>
will guess as follows:

Strip off F<debian/tmp> (or the sourcedir if one is given) from the front of
the filename, if it is present, and install into the dirname of the
filename. So if the filename is F<debian/tmp/usr/bin>, then that directory
will be copied to F<debian/package/usr/>. If the filename is
F<debian/tmp/etc/passwd>, it will be copied to F<debian/package/etc/>.

=item I<file|dir> ... I<destdir>

Lists files (or directories) to install and where to install them to.
The files will be installed into the first package F<dh_install> acts on.

=back

=cut

init(options => {
	"autodest" => \$dh{AUTODEST},
	"list-missing" => \$dh{LIST_MISSING},
	"fail-missing" => \$dh{FAIL_MISSING},
	"sourcedir=s" => \$dh{SOURCEDIR},
});

my $srcdir = '.';
$srcdir = $dh{SOURCEDIR} if defined $dh{SOURCEDIR};

my $missing_files = 0;

if ($dh{LIST_MISSING} || $dh{FAIL_MISSING}) {
	deprecated_functionality('Please use dh_missing --list-missing/--fail-missing instead', 12);
}

# Support for -X flag.
my $exclude = '';
if ($dh{EXCLUDE_FIND}) {
	$exclude = '! \( '.$dh{EXCLUDE_FIND}.' \)';
}

# PROMISE: DH NOOP WITHOUT pkgfile-logged(install) cli-options()

foreach my $package (getpackages()) {
	my (@installed, %dest2sources);
	my $default_source_dir = default_sourcedir($package);
	my @search_dirs = ($srcdir);
	push(@search_dirs, $default_source_dir) if not compat(6);

	# Look at the install files for all packages to handle
	# list-missing/fail-missing, but skip really installing for
	# packages that are not being acted on.
	my $skip_install = process_pkg($package) ? 0 : 1;

	my $tmp=tmpdir($package);
	my $file=pkgfile($package,"install");

	my @install;
	if ($file) {
		@install=filedoublearray($file); # no globbing here; done below
	}


	# With autodest, we can just pretend every pattern was on its own line
	@install = map { [$_] } map { @$_ } @install if $dh{AUTODEST};
	
	if (($package eq $dh{FIRSTPACKAGE} || $dh{PARAMS_ALL}) && @ARGV) {
		if ($dh{AUTODEST}) {
			# Same as above, with autodest, we can just isolate each entry
			# - the split is for bug-backwards compatibility (#867866).
			push(@install, map { [$_] } map { split } @ARGV);
		} else {
			# Bug backwards compatibility (#867866).  The new "glob_expand"
			# interface is smart enough to not split on spaces, but dh_install
			# used to do that... *except* for the "DEST" since it was never
			# passed to the glob function.
			my @a = @ARGV;
			my $dest = pop(@a) if @a > 1;
			my @srcs = map { split } @a;
			push(@srcs, $dest) if defined($dest);
			push(@install, \@srcs);
		}
	}


	my $glob_error_handler = sub {
		# Do not require a match for packages that not acted on
		# (directly).  After all, the files might not have been
		# generated/compiled.
		return if $skip_install;
		++$missing_files;
		goto \&glob_expand_error_handler_warn_and_discard;
	};

	foreach my $set (@install) {
		my ($dest, @filelist, @patterns);

		if (@$set > 1) {
			$dest=pop @$set;
		}
		# Skip excluded patterns.  We will need two exclude checks per pattern;
		# 1) exclude the entire pattern as people expect this to work (#814856)
		# 2) exclude files matched by the pattern as people could have just
		#    excluded a single file of a "dir/*"-pattern.
		# This line below filters entire patterns
		@patterns = grep { not excludefile($_) } @{$set};
		next if not @patterns;
		foreach my $glob (@patterns) {
			my @found = glob_expand(\@search_dirs, $glob_error_handler, $glob);
			push(@filelist, map { tr{/}{/}s; $_ } @found);
		}

		if (! @filelist && ! $skip_install) {
			warning("$package missing files: @$set");
			++$missing_files;
			next;
		}

		# Do a quick bulk handling of excluded files and update @installed.
		# - this is for filtering files matched by the pattern
		@filelist = grep { not excludefile($_) } @filelist if $exclude;
		push(@installed, @filelist);

		# ... because then we can short-curcit here.
		next if $skip_install or $missing_files;

		if (not $exclude) {
			my @unoptimized;
			for my $src (@filelist) {
				my $d = $dest // compute_dest($default_source_dir, $src);
				my $basename = basename($src);
				if (exists($dest2sources{$d}{$basename})) {
					# If there is a clash, silently undo the optimizations.
					# See #866405 and #868169.
					my $replaced = delete($dest2sources{$d}{$basename});
					# Associate the $replaced the destination
					# directory.  We cannot be sure that compute_dest will
					# get it right nor can we blindly set $dest.
					#
					# It is technically unnecessary for $src, but we
					# might as well do it to possibly save a
					# compute_dest call.
					push(@unoptimized, [$replaced, $d], [$src, $d]);
					next;
				}
				$dest2sources{$d}{$basename} = $src;
			}
			next if not @unoptimized;
			@filelist = @unoptimized;
		}

		foreach my $src (@filelist) {

			my $target_dest;

			if (ref($src)) {
				# On a failed optimization, we will have the
				# destination directory.
				($src, $target_dest) = @{$src};
			} else {
				$target_dest = $dest;
				if (! defined $target_dest) {
					# Guess at destination directory.
					$target_dest = compute_dest($default_source_dir, $src);
				}
			}

			# Make sure the destination directory exists.
			install_dir("$tmp/$target_dest");

			if (-d $src && $exclude) {
				my $basename = basename($src);
				my $dir = ($basename eq '.') ? $src : "$src/..";
				my $pwd=`pwd`;
				chomp $pwd;
				complex_doit("cd '$dir' && " .
							 "find '$basename' $exclude \\( -type f -or -type l \\) -print0 | LC_ALL=C sort -z | " .
							 "xargs -0 -I {} cp --reflink=auto --parents -dp {} $pwd/$tmp/$target_dest/");
				# cp is annoying so I need a separate pass
				# just for empty directories
				complex_doit("cd '$dir' && " .
							 "find '$basename' $exclude \\( -type d -and -empty \\) -print0 | LC_ALL=C sort -z | " .
							 "xargs -0 -I {} cp --reflink=auto --parents -a {} $pwd/$tmp/$target_dest/");
			}
			else {
				doit("cp", '--reflink=auto', "-a", $src, "$tmp/$target_dest/");
			}
		}
	}

	for my $dest (sort(keys(%dest2sources))) {
		my @srcs = sort(values(%{$dest2sources{$dest}}));
		# Make sure the destination directory exists.
		install_dir("$tmp/$dest");
		xargs(\@srcs, "cp", '--reflink=auto', "-a", XARGS_INSERT_PARAMS_HERE, "$tmp/$dest/");
	}
	log_installed_files($package, @installed);
}

if ($missing_files) {
	# There were files we could not install (e.g. patterns that matched nothing)
	error("missing files, aborting");
}

if ($dh{LIST_MISSING} || $dh{FAIL_MISSING}) {
	my @options;
	foreach (@{$dh{EXCLUDE}}) {
		push(@options, '--exclude', $_);
	}
	push(@options, '--sourcedir', $dh{SOURCEDIR}) if defined($dh{SOURCEDIR});
	push @options, "--list-missing" if $dh{LIST_MISSING};
	push @options, "--fail-missing" if $dh{FAIL_MISSING};
	doit("dh_missing", @options);
}

sub compute_dest {
	my ($source_dir, $dest) = @_;

	$dest =~ s/^(.*\/)?\Q$srcdir\E\///;
	$dest =~ s/^(.*\/)?\Q$source_dir\E\///;
	$dest = dirname("/".$dest);

	return $dest;
}

=head1 EXAMPLES

Here are some small examples of configuration files for dh_install.

    # Install my-prog into usr/bin (as "usr/bin/my-prog")
    my-prog usr/bin

    # Install a plugins directory into usr/share/my-prog
    # (as "usr/share/my-prog/plugins/")
    plugins usr/share/my-prog

    # Install a file with spaces in into usr/share/my-prog/data
    # (as "usr/share/my-prog/data/my datafile with spaces.txt")
    # ASSUMES COMPAT 13, where substitution patterns are available
    my${Space}datafile${Space}with${Space}spaces.txt usr/share/my-prog/data

    # Install a library into the multi-arch lib directory
    # ASSUMES COMPAT 13, where substitution patterns are available
    build/output/libfrop*.so.* usr/lib/${DEB_HOST_MULTIARCH}

=head1 LIMITATIONS

B<dh_install> cannot rename files or directories, it can only install them
with the names they already have into wherever you want in the package
build tree.

However, renaming can be achieved by using B<dh-exec> with compatibility level 9 or
later.  An example debian/I<package>.install file using B<dh-exec>
could look like:

 #!/usr/bin/dh-exec
 debian/default.conf => /etc/my-package/start.conf

Please remember the following three things:

=over 4

=item * The package must be using compatibility level 9 or later (see L<debhelper(7)>)

=item * The package will need a build-dependency on dh-exec.

=item * The install file must be marked as executable.

=back
  
=head1 SEE ALSO

L<debhelper(7)>

This program is a part of debhelper.

=head1 AUTHOR

Joey Hess <joeyh@debian.org>

=cut