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realsync
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realsync
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#!/usr/bin/perl -w
use Cwd qw(getcwd abs_path);
use strict;
use File::Basename;
use File::Path qw(mkpath rmtree);
use File::Spec;
use Text::ParseWords;
use IPC::Open2;
use IO::Handle;
use Digest::MD5 'md5_hex';
use Fcntl ':mode';
use POSIX ":sys_wait_h";
use threads;
use threads::shared;
# Paths (will be filled later automatically).
my $DIR_PRIVATE = undef; # private area directory (holds e.g. .ssh folder)
my $FILE_CONFIG = undef; # config file
my $FILE_IDENTITY = undef; # identity file within .ssh folder
# Constants.
my $BINDIR = dirname(abs_path(__FILE__));
my $DELAY = 0.2;
my $DEBUG_PATCH_TREE = 0;
my $SSH_VERBOSE = 0;
my $MIN_CHANGES_FOR_RSYNC = 10;
my @SSH_OPTIONS = (
"-o", "Compression=yes",
"-o", "CompressionLevel=9",
"-o", "ConnectTimeout=3",
"-o", "ServerAliveInterval=2",
"-o", "ServerAliveCountMax=4",
"-o", "StrictHostKeyChecking=no",
);
my @RSYNC_OPTIONS = (
"-rltzxvS",
"--delete",
"--partial"
);
my @RSYNC_WRAPPER = ();
my @RSYNC_SSH_WRAPPER = ();
my $REALSYNC_SPEC_FILE = ".realsync";
my @DEFAULT_EXCLUDE = ($REALSYNC_SPEC_FILE, "CVS", ".git", ".svn", ".hg", ".cache", ".idea", "nbproject", "~*", "*.tmp", "*.pyc", "*.swp");
# Globals.
my %CONFIG;
my $REM_SCRIPT = get_remote_script();
my $SSH_PID;
my @TREE;
my $IN_REPLICATION = 0;
my $HOOKS =
($ENV{COMSPEC} && 'Realsync::Win32')
|| ($^O =~ /darwin/i && 'Realsync::Darwin')
|| ($^O =~ /linux/i && 'Realsync::Linux')
|| 'Realsync::Generic';
my %PENDING: shared = ();
#
# Does everything,
#
sub main {
eval {
print "dkLab RealSync: replicate developer's files over SSH in realtime.\n\n";
# Make remote script's subs available.
eval("sub { $REM_SCRIPT }"); die $@ if $@;
# If an argument is passed, chdir to that directory. Else use the current one.
my $chdir = $ARGV[0];
if (!defined $chdir && -f $REALSYNC_SPEC_FILE) {
$chdir = ".";
}
if (!defined $chdir) {
die "Usage:\n realsync SOURCE_DIRECTORY_WHICH_IS_REPLICATED\n";
}
chdir($chdir) or die "Cannot set current directory to $chdir: $!\n";
# Initialize and (possibly) correct environment.
$HOOKS->init_env();
# Correct pathes.
build_pathes_based_on_cwd();
# Run the mainloop.
mainloop();
};
if ($@) {
if (!$IN_REPLICATION) {
print STDERR $@;
} else {
logger($@);
}
print STDERR "\nPress Enter to quit... ";
scalar <STDIN>;
}
}
#
# Main execution loop.
# Called inside eval{} block to catch errors and print them.
#
sub mainloop {
binmode(STDIN); STDIN->autoflush(1);
binmode(STDOUT); STDOUT->autoflush(1);
binmode(STDERR); STDERR->autoflush(1);
$SIG{CHLD} = 'IGNORE'; # later, if you use system(), reset this signal!
$SIG{PIPE} = 'IGNORE'; # do not kill the whole realsync if remote SSH dies
$SIG{INT} = $SIG{TERM} = $SIG{KILL} = sub { onexit(); exit; };
if (!-d $DIR_PRIVATE || !-f $FILE_CONFIG) {
do_install();
}
# If we use a custom identity file, switch home dir to its directory.
if (-f $FILE_IDENTITY) {
$ENV{HOME} = $DIR_PRIVATE;
}
# Read configuration.
%CONFIG = read_config($FILE_CONFIG);
if ($CONFIG{identity}) {
$FILE_IDENTITY = $CONFIG{identity};
}
# We MUST avoid chdir: in Cygwin we have problems with non-ASCII names.
-d cfg("local") or die "Bad local directory " . cfg("local") . ": $!\n";
$IN_REPLICATION = 1;
spawn_notify_daemon();
$HOOKS->init_gui();
while (1) {
eval { do_replication() };
logger($@) if $@;
onexit(1);
sleep(1);
}
}
#
# Called at script dead.
#
sub onexit {
my ($iteration_end) = @_;
if ($IN_REPLICATION) {
kill(9, $SSH_PID) if $SSH_PID;
$SSH_PID = undef;
$HOOKS->notification("wait") if $HOOKS;
}
if (!$iteration_end) {
$HOOKS->finalize_env() if $HOOKS;
}
}
#
# Called at the end of script.
#
sub END {
onexit();
}
#
# Builds pathes and saves it to global variables.
#
sub build_pathes_based_on_cwd {
my ($is_tmp) = @_;
my $dir_appdata = ($ENV{APPDATA} || $ENV{HOME}) or die "Environment variable HOME must be set!\n";
# First, try to use legacy scheme.
build_pathes_based_on_cwd_legacy($dir_appdata, $is_tmp);
return if -f $FILE_CONFIG;
# Use a new scheme.
my $cwd = getcwd();
my $hash = $cwd;
$hash =~ s{^\w:[/\\]|[/\\]+$}{}sg;
$hash =~ s{\W+}{_}sgi;
$hash = substr($hash, -80) if length($hash) > 80;
$hash = substr(md5_hex($cwd), 0, 10) . "_" . $hash;
# Build pathes.
$DIR_PRIVATE = $dir_appdata . "/$REALSYNC_SPEC_FILE/" . $hash;
$DIR_PRIVATE .= ".tmp" if $is_tmp;
$FILE_IDENTITY = "$DIR_PRIVATE/.ssh/identity";
$FILE_CONFIG = "$cwd/$REALSYNC_SPEC_FILE";
}
#
# Legacy pathes for configuration.
#
sub build_pathes_based_on_cwd_legacy {
my ($dir_appdata, $is_tmp) = @_;
$DIR_PRIVATE = $dir_appdata . "/$REALSYNC_SPEC_FILE/" . substr(md5_hex(getcwd()), 0, 10);
$DIR_PRIVATE .= ".tmp" if $is_tmp;
$FILE_CONFIG = "$DIR_PRIVATE/realsync.ini";
$FILE_IDENTITY = "$DIR_PRIVATE/.ssh/identity";
}
#
# Executes the whole replication algorithm.
#
sub do_replication {
# Run SSH asynchronously to save time.
do_run_ssh("Initiating a background connection with " . cfg("remote") . "...");
# Read initial state BEFORE rsync!
@TREE = ();
my $num_objs = grep { $_->{type} eq "dir" } get_changes();
# Initial rsync.
do_rsync("Fast initial rsync synchronization...") if !$DEBUG_PATCH_TREE;
# Watching.
logger("", 0, 1);
do_watch("Watching for changes in $num_objs folder(s)...");
}
#
# Executes RSYNC command.
#
sub do_rsync {
my ($msg) = @_;
my ($h_host, $h_port) = parse_host_spec(cfg("host"));
my @rsync_cmd = (
@RSYNC_WRAPPER,
"rsync",
"-e", join(" ",
@RSYNC_SSH_WRAPPER,
"ssh",
(-f $FILE_IDENTITY ? ("-i", $FILE_IDENTITY) : ()),
split_cmd_args(cfg("ssh_options")),
"-p$h_port"
),
split_cmd_args(cfg("rsync_options")),
$HOOKS->convert_rsync_local_path(cfg("local")) . "/", # the trailing slash is significant!
cfg("user") . '@' . $h_host . ":" . cfg("remote") . "/",
map { ("--exclude", $_) } @{cfg("exclude", 1)},
);
$HOOKS->notification("rsync");
while (1) {
logger($msg);
#logger(join(" ", map { /\s|\*/s ? '"' . $_ . '"' : $_ } @rsync_cmd));
local $SIG{CHLD}; # else system() does not work
local $SIG{PIPE}; # to be on a safe side
my $exitcode = system(@rsync_cmd);
if (!defined $exitcode || $exitcode < 0) {
logger("Failed to run rsync: $!\n");
} elsif ($exitcode & 127) {
logger("Rsync died with signal " . ($exitcode & 127));
} elsif (($exitcode >> 8) == 0) {
last;
} else {
logger("Rsync exited with code " . ($exitcode >> 8) . ", retrying...");
}
usleep(0.5);
}
$HOOKS->notification("wait");
}
#
# Executes background SSH process which is used to push changes.
#
sub do_run_ssh {
my ($msg) = @_;
logger($msg);
my $rem_script = $REM_SCRIPT;
$rem_script =~ s/!/@@/sg; # for tcsh
my ($h_host, $h_port) = parse_host_spec(cfg("host"));
my @ssh_cmd = (
"ssh",
($SSH_VERBOSE ? ("-v") : ()),
(-f $FILE_IDENTITY ? ("-i", $FILE_IDENTITY) : ()),
split_cmd_args(cfg("ssh_options")),
"-p$h_port",
cfg("user") . '@' . $h_host,
# For TCSH we must NEVER insert "!" character into arguments, else it
# breaks the program. So we previously replace "!" to "@@" and then,
# at the remote side, replace it back to "!", but with no "!" specification.
q{ulimit -t 100; exec perl -we '$_=$ARGV[0]; s/@@/\x21/sg; eval($_); die $@ if $@;'} . " '$rem_script'"
);
# use Data::Dumper; print Dumper(\@ssh_cmd); exit;
# Unfortunately on Win32 we cannot read from a handle returned
# from the first open2's argument - Perl hangs even if buffering
# is correctly turned off. So we cannot receive a feedback from
# a remote SSH and are just passively displaying its output.
$SSH_PID = open2(">&STDOUT", \*IN, @ssh_cmd) or die "Cannot run ssh: $!\n";
binmode IN; IN->autoflush(1);
}
#
# Performs endless changes watching.
#
sub do_watch {
my ($msg) = @_;
logger($msg);
# Watching loop.
print IN cfg("remote") . "\n";
$HOOKS->notification("replication");
my $candidates = undef;
while (1) {
my @changes = get_changes($candidates);
if (@changes > $MIN_CHANGES_FOR_RSYNC) {
do_rsync("Detected changes in more than $MIN_CHANGES_FOR_RSYNC objects. Running rsync: it's faster.");
} elsif (@changes) {
logger("Detected " . @changes . " change(s), transmitting...");
$HOOKS->notification("transfer");
foreach my $change (@changes) {
write_change(\*IN, $change);
}
$HOOKS->notification("wait");
}
# Wait with periodical callback checking.
$candidates = wait_notify(sub {
if (!$SSH_PID || !kill(0, $SSH_PID)) {
die "SSH client died, restarting.\n";
}
});
}
}
#
# Performs installation process.
#
sub do_install {
local $SIG{CHLD}; # else system() does not work
local $SIG{PIPE}; # to be on a safe side
my $step_num = 1;
my $step_text = sub {
my $s = "(Step $step_num) $_[0]";
$step_num++;
return $s;
};
print "THIS WIZARD APPEARS ONLY ONCE!\nNEXT TIME THE REPLICATION WILL START IMMEDIATELY.\n\n";
my %CONFIG = ();
if (-f $FILE_CONFIG) {
%CONFIG = read_config($FILE_CONFIG);
print "Read options from existing config: $FILE_CONFIG.\n";
} else {
print "Starting an interactive installation.\n";
}
print "\n";
my @config = ();
my $local;
if (!defined $CONFIG{local}) {
$local = ask(
$step_text->("LOCAL directory to replicate FROM:\n "),
getcwd(),
sub { -d $_ ? undef : "No such directory: $_" }
);
$local = "." if $local eq getcwd();
$local =~ s{\\}{/}sg;
$local =~ s{/+$}{}sg;
push @config, {
"name" => "local",
"value" => $local,
"comment" => "Local directory to be realtime-replicated.",
};
} else {
$local = $CONFIG{local};
}
chdir($local) or die "Cannot chdir to $local: $!\n";
build_pathes_based_on_cwd(1); # builds TEMPORARY paths
mkpath($DIR_PRIVATE, 0, 0700); # IMPORTANT: it's a marker to skip the installation wizard next time
my $host = undef;
my $user = undef;
my $step_save = $step_num;
while (1) {
$step_num = $step_save;
if (!defined $CONFIG{host}) {
push @config, {
"name" => "host",
"value" => ($host = ask(
$step_text->("REMOTE host to replicate TO (host or host:port):"),
$host,
sub { /^[-\w.]+(?::\d+)?$/s ? undef : "Invalid hostname!" }
)),
"comment" => "Remote host to replicate to over SSH.",
};
} else {
$host = $CONFIG{host};
}
if (!defined $CONFIG{user}) {
push @config, {
"name" => "user",
"value" => ($user = ask(
$step_text->("REMOTE SSH login at $host:"),
$user,
sub { /^\S+$/s ? undef : "Invalid login format!" }
)),
"comment" => "User to connect to the remote host.",
};
} else {
$user = $CONFIG{user};
}
# Check if we already have a passwordless access.
print "Checking if we have access to $user\@$host with no password...\n";
my ($h_host, $h_port) = parse_host_spec($host);
my $cmd_check = "ssh -q -o PasswordAuthentication=no -o BatchMode=yes -o StrictHostKeyChecking=no -p$h_port $user\@$h_host exit";
if (system($cmd_check) == 0) {
print " we already have access to the host, continuing.\n";
last;
} else {
print " no access, generating new SSH keys.\n";
}
# Use a custom SSH key (create a new one if no key exists).
mkpath(dirname($FILE_IDENTITY), 0, 0700);
if (!-f $FILE_IDENTITY) {
my $cmd = "ssh-keygen -N \"\" -q -t rsa -b 2048 -f $FILE_IDENTITY";
if (system($cmd)) {
die "Cannot generate SSH keys. ssh-keygen: $!\n$cmd\n";
}
# Temporarily rename the file to avoid the case when the next
# pubkey copying failed and the user restarts realsync again.
rename($FILE_IDENTITY, "$FILE_IDENTITY.tmp");
}
# For users who ask: "should I enter my password each time?"
ask($step_text->("ONLY ONCE you will be asked for a password. Continue?"), "y");
my $pub_file = "$FILE_IDENTITY.pub";
# system() is better than popen(), because Perl does not flush a child
# process'es STDERR till we read from STDIN (Win32 perl bug?).
print "Copying SSH key to $user\@$host. Executing:\n";
my $cmd = "ssh"
. " -o StrictHostKeyChecking=no -p$h_port $user\@$h_host\n"
. ' "cd; umask 077; test -d .ssh && chmod 700 .ssh || mkdir .ssh;'
. ' test -e .ssh/authorized_keys && chmod 600 .ssh/authorized_keys; (echo; cat)'
. ' >> .ssh/authorized_keys"';
my $show = '$ ' . $cmd;
print "$show\n";
$cmd =~ s/\s*\n\s*/ /sg;
if (system("$cmd < $pub_file")) {
print STDERR "\n";
print STDERR "Failed connecting to $user\@$host. Please enter a correct host, login and password.\n";
print STDERR "\n";
next;
}
print "Public key $pub_file is copied to $user\@$host!\n";
print "\n";
# Successfully copied, so rename the file back.
rename("$FILE_IDENTITY.tmp", $FILE_IDENTITY);
last;
}
if (!defined $CONFIG{remote}) {
push @config, {
"name" => "remote",
"value" => ask(
$step_text->("REMOTE directory at $user\@$host to replicate to:"),
undef,
sub {
print " checking if the directory exists...\n";
my ($h_host, $h_port) = parse_host_spec($host);
my $cmd = "ssh"
. (-f $FILE_IDENTITY ? " -i $FILE_IDENTITY" : "")
. " -o StrictHostKeyChecking=no -p$h_port $user\@$h_host \"test -d $_\"";
my $ret = system($cmd) >> 8;
if ($ret != 0) {
return "Directory $_ at $user\@$host does not exist. Try again.";
}
return;
}
),
"comment" => "Directory at the remote host to replicate files to.",
};
} else {
# Pass.
}
if (!defined $CONFIG{exclude}) {
print "\n";
my $excludes = ask(
$step_text->(
"Exclusions from " . basename($FILE_CONFIG) . " configuration are:\n" .
" " . join(" ", @DEFAULT_EXCLUDE) . "\n" .
"Enter a space-separated list of ADDITIONAL exclusions:",
),
""
);
my $first = 1;
foreach my $mask (@DEFAULT_EXCLUDE, grep { length } split(m/[\s+,]+/s, $excludes)) {
push @config, {
"name" => "exclude",
"value" => $mask,
"comment" => $first ? "Pathname wildcards to be excluded from the replication.\nUse \"*\" for any filename character and \"**\" for any character,\nincluding \"/\" in pathnames." : undef,
};
$first = 0;
}
} else {
# Pass.
}
if (!%CONFIG) {
push @config, {
"name" => "#exclude_file",
"value" => ".gitignore",
"comment" => "You may read exclusion list from e.g. a .gitignore file.",
};
}
if (!defined $CONFIG{nosound}) {
push @config, {
"name" => "nosound",
"value" => "0",
"comment" => "To turn off \"synchronization ding\" sound, set the following to 1.",
};
}
if (!%CONFIG) {
unshift @config, {
"name" => "#load",
"value" => "$REALSYNC_SPEC_FILE-local",
"comment" => "You may load some other config files. It's a good practice to put\n"
. "all user-specific options (e.g. \"user\" directive, see below) to\n"
. "$REALSYNC_SPEC_FILE-local plus add this file to .gitignore. After that\n"
. "you commit the current $REALSYNC_SPEC_FILE file to your version control\n"
. "system, so developers may just override options in their own local files."
};
push @config, {
"name" => "#rsync_options",
"value" => join(" ", @RSYNC_OPTIONS),
"comment" => "Options passed to RSYNC.",
};
push @config, {
"name" => "#ssh_options",
"value" => join(" ", @SSH_OPTIONS),
"comment" => "Options passed to SSH.",
};
}
print "\n";
if (@config) {
open(local *F, ">>", $FILE_CONFIG);
if (!%CONFIG) {
print F "##\n";
print F "## dkLab RealSync configuration file.\n";
print F "##\n";
}
foreach my $opt (@config) {
my $comment = $opt->{comment};
if ($comment) {
$comment =~ s/^/# /mg;
print F "\n$comment\n";
}
print F $opt->{name} . " = " . $opt->{value} . "\n";
}
close(F);
print "All done. The configuration file has been updated.\n";
}
print "Configuration file is:\n $FILE_CONFIG\n";
if (-f $FILE_IDENTITY) {
print "Generated SSH private key is saved to:\n";
print " $FILE_IDENTITY\n";
}
# Flip tmp keys directory into the permanent one at the very end, so if
# one presses Ctrl+C above and relaunches, everything is started from scratch.
my ($tmp_dir_private) = ($DIR_PRIVATE);
build_pathes_based_on_cwd();
rename($tmp_dir_private, $DIR_PRIVATE);
print "\n";
print "Press Enter start the replication. ";
scalar <STDIN>;
}
#
# Asks a question interactively.
# Used by installer only.
#
sub ask {
my ($msg, $default, $check) = @_;
while (1) {
print $msg . " ";
print "[" . (length $default ? $default : "<none>") . "] " if defined $default;
local $_ = <STDIN>;
s/^\s+|\s+$//sg;
if ($_ eq "") {
return $default if defined $default;
next;
}
if ($check) {
my $err = $check->();
if ($err) {
print "$err\n";
next;
}
}
return $_;
}
}
#
# Reads a config item value.
#
sub cfg {
my ($name, $nodie) = @_;
my $value = $CONFIG{$name};
if ($name eq "ssh_options") {
$value ||= join(" ", @SSH_OPTIONS);
}
if ($name eq "rsync_options") {
$value ||= join(" ", @RSYNC_OPTIONS);
}
if (!$nodie) {
if (!defined $value) {
die("Cannot read \"$name\" configuration option at $FILE_CONFIG!\n");
}
}
if ($name eq "local" || $name eq "remote") {
# Trailing slash is removed, but added at rsync call manually,
# because it is significant for rsync.
$value =~ s{[/\\]+$}{}sg;
}
return $value;
}
#
# Precise sleep function.
#
sub usleep {
my ($delay) = @_;
select(undef, undef, undef, $delay);
}
#
# Pass information about background file changes monitoring.
# This is an abstraction level for multi-thread communication.
#
{
my $NOTIFIES_SUPPORTED: shared = 0;
my @NOTIFIES: shared = ();
sub notifies_set_supported {
my ($flag) = @_;
lock $NOTIFIES_SUPPORTED;
$NOTIFIES_SUPPORTED = !!$flag;
}
sub notifies_is_supported {
lock $NOTIFIES_SUPPORTED;
return $NOTIFIES_SUPPORTED;
}
sub notifies_push {
lock @NOTIFIES;
push @NOTIFIES, @_;
}
sub notifies_pop {
lock @NOTIFIES;
my @changes = @NOTIFIES;
@NOTIFIES = ();
return @changes;
}
}
#
# Calculates filesystem changes between the previous call to
# get_changes() and the current time.
#
sub get_changes {
my ($candidates) = @_;
my @changes = ();
# Build current tree.
my @cur_tree = ();
if (!$candidates || !@$candidates) {
make_tree(\@cur_tree, ".");
} else {
@cur_tree = @TREE;
$candidates = expand_dir_candidates(\@cur_tree, $candidates);
if ($DEBUG_PATCH_TREE) {
foreach (@$candidates) { print "Candidate: $_\n" }
}
patch_tree(\@cur_tree, $candidates);
}
# foreach (@cur_tree) { print $_->{name} . "\n"; } print "\n";
# use Data::Dumper; print Dumper(\@cur_tree); exit;
# Collect deleted entries.
my %cur_tree = map { ($_->{name} => $_) } @cur_tree;
for (my $i = 0; $i < @TREE; $i++) {
my $prev = $TREE[$i];
my $name = $prev->{name};
if (!$cur_tree{$name}) {
push @changes, {
type => "del",
name => $name,
};
# Skip children entries.
for (++$i; $i < @TREE; $i++) {
last if substr($TREE[$i]->{name}, 0, length($name) + 1) ne "$name/";
}
--$i;
}
}
# Collect added entries.
my %TREE = map { ($_->{name} => $_) } @TREE;
foreach my $cur (@cur_tree) {
my $name = $cur->{name};
if (!$TREE{$name} || $TREE{$name}{stamp} != $cur->{stamp} || $TREE{$name}{perm} ne $cur->{perm}) {
push @changes, $cur;
}
}
# use Data::Dumper; open(local *F, ">/realsync.debug"); print F Dumper(\@TREE) . "\n\n"; print F Dumper(\@changes);
@TREE = @cur_tree;
return @changes;
}
#
# Reads filesystem information about $rel.
# Returns undef if no such file/directory exists.
#
sub make_tree_item {
my ($rel) = @_;
my $exclude_re = cfg("exclude_re", 1);
# We use substr($rel, 1) below, because we need to cut leading "."
# (rel pathes are ALWAYS started with ".", so we must cat to avoid its
# matching with ".*" glob wildcard: e.g. "./aa/b" does match ".*"
# glob wildcard, but "/aa/b" - does not.
return if $exclude_re && $rel ne "." && substr($rel, 1) =~ $exclude_re;
my $local = cfg("local");
my $fullpath = "$local/$rel";
my @stat = stat($fullpath);
return if !@stat; # hmm? but it is needed for linux mcedit
my $cur = {
path => $fullpath,
name => $rel,
stamp => $stat[9],
perm => ($HOOKS eq 'Realsync::Win32' ? "" : ($stat[2] & 0777)), # Skip perms for Windows
};
if (S_ISREG($stat[2])) {
$cur->{type} = "fil";
} elsif (S_ISDIR($stat[2])) {
$cur->{type} = "dir";
}
return $cur;
}
#
# Makes a tree from the filesystem. You may limit recursion by $max_level: e.g.
# if it is 1, only $rel and its direct children (if any) are returned.
#
sub make_tree {
my ($tree, $rel, $max_level) = @_;
my $cur = make_tree_item($rel) or return;
push @$tree, $cur;
return if defined($max_level) && $max_level == 0;
if ($cur->{type} eq "dir") {
opendir(local *D, $cur->{path}) or die "Cannot opendir $cur->{path}: $!\n";
my @content = sort readdir(D); # sort is VERY important here! we use bsearch!
closedir(D);
foreach my $e (@content) {
next if $e eq "." || $e eq "..";
make_tree($tree, $cur->{name} . "/" . $e, (defined($max_level) ? $max_level - 1 : undef));
}
}
}
#
# Updates the current tree in memory checking statuses of enumerated
# candidate elements (each of them may be changed, added or removed).
#
sub patch_tree {
my ($tree, $candidates) = @_;
foreach my $cand (@$candidates) {
my $branch_start_idx = find_branch_start_in_tree($tree, $cand);
if (!defined($tree->[$branch_start_idx]) || $tree->[$branch_start_idx]->{name} ne $cand) {
# Candidate is not within the tree, add it at $branch_start_idx pos.
my @subtree;
make_tree(\@subtree, $cand);
splice(@$tree, $branch_start_idx, 0, @subtree);
} else {
# Candidate is within the old tree.
my $new_item = make_tree_item($cand);
if (!$new_item) {
# Item was deleted. Also remove its children.
my $branch_end_idx = find_branch_end_in_tree($tree, $cand, $branch_start_idx);
splice(@$tree, $branch_start_idx, $branch_end_idx - $branch_start_idx + 1);
} else {
# Item was modified. Just update the previous one.
splice(@$tree, $branch_start_idx, 1, $new_item);
}
}
}
}
#
# For each directory in the candidates list expand it to all direct
# children of this directory (existed now or existed previously).
#
sub expand_dir_candidates {
my ($tree, $candidates) = @_;
my %expanded = ();
foreach my $cand (@$candidates) {
my $item = make_tree_item($cand);
if (!$item || $item->{type} eq 'fil') {
$expanded{$cand} = undef;
} elsif ($item->{type} eq 'dir') {
# First, files/directories which exist directly below $cand NOW (including $cand).
my @existed = ();
make_tree(\@existed, $cand, 1);
@expanded{map { $_->{name} } @existed} = ();
# Next, add sub-files/sub-directories which exist PREVIOUSLY.
my @previous = ();
my $branch_start_idx = find_branch_start_in_tree($tree, $cand);
my $branch_end_idx = find_branch_end_in_tree($tree, $cand, $branch_start_idx);
my $item_is_child_to_cand_re = qr{^\Q$cand\E/[^/]+$}s;
for (my $i = $branch_start_idx + 1; $i <= $branch_end_idx; $i++) {
my $name = $tree->[$i]->{name};
$expanded{$name} = undef if $name =~ $item_is_child_to_cand_re;
}
}
}
return [sort keys %expanded];
}
#
# Searches for $rel position within the tree. If nothing is found,
# returns a position at which $rel should be inserted alphabethically.
#
sub find_branch_start_in_tree {
my ($tree, $rel) = @_;
my $idx = binsearch(
sub {
# Make "/" to be the lowest possible priority. This is needed, because
# the plain "/" is greater than ".", so we have a WRONG ordering:
# - aaa/bbb
# - aaa/bbb.ext
# - aaa/bbb/ccc
# This is wrong, the correct order must be:
# - aaa/bbb
# - aaa/bbb/ccc
# - aaa/bbb.ext
my $a = $_[0]; $a =~ tr{/}{\x00};
my $b = $_[1]->{name}; $b =~ tr{/}{\x00};
return $a cmp $b;
},
$rel,
$tree
);
return $idx;
}
#
# Starting from $branch_start_idx position in the tree, searches for
# the last item which is descendand of $rel (or equals to $rel).
#
sub find_branch_end_in_tree {
my ($tree, $rel, $branch_start_idx) = @_;
my $i;
for ($i = $branch_start_idx + 1; $i < @$tree; $i++) {
last if substr($tree->[$i]->{name}, 0, length($rel) + 1) ne "$rel/";
}
$i--;
return $i;
}
#
# Sorted array binary search.
# Returns the index of the position at which $s must be situated.
#
sub binsearch {
my ($f, $s, $list) = @_;
my $i = 0;
my $j = $#$list;
for (;;) {
my $k = int(($j - $i) / 2) + $i;
my $c = &$f($s, $list->[$k]);
#printf "== %s...%s k=%s %s <=> %s = %s\n", $i, $j, $k, $s, $list->[$k], $c;
if ($c == 0) {
return $k;
} elsif ($c < 0) {
$j = $k - 1;
return $k if ($i > $j);
} else {
$i = $k + 1;
return $i if ($i > $j);
}
}
}
#
# Splits command-line arguments by spaces (with correct quotes processing).
#
sub split_cmd_args {
my ($s) = @_;
return Text::ParseWords::shellwords($s);
}
#
# Reads a configuration file.
#
sub read_config {
my ($file) = @_;
open(local *F, $file) or die "Cannot open $file: $!\n";
my %config;
while (<F>) {
# Comments could be at the beginning of the line only,
# because "#" character is valid e.g. inside a file path.
s/^\s*#.*//sg;
s/^\s+|\s+$//sg;
next if !$_;
my ($k, $v) = ($_ =~ m/^(\w+)(?:\s*=\s*|\s+)(.*)$/s);
next if !$k;
if ($k eq "exclude") {
push @{$config{exclude}}, $v;
} elsif ($k eq "exclude_file") {
push @{$config{exclude}}, read_exclude_file($v);
} elsif ($k eq "load") {
%config = (%config, read_config(File::Spec->rel2abs($v, dirname($file))));
} else {
$config{$k} = $v;
}
}
if ($config{exclude}) {
$config{exclude_re} = join("|", map { mask_to_re($_) } @{$config{exclude}});
}
return %config;
}
#
# Reads a content of .gitignore-like file.
#
sub read_exclude_file {
my ($file) = @_;
my @excludes = ();
open(local *F, $file) or die "Cannot open an exclude file $file: $!\n";
while (<F>) {
# Comments could be at the beginning of the line only,
# because "#" character is valid e.g. inside a file path.
s/^\s*#.*//sg;
s/^\s+|\s+$//sg;
push @excludes, $_ if length($_);
}
return @excludes;
}
#
# Converts filesystem wildcard into regular expression.
#
sub mask_to_re {
my ($mask) = @_;
my $is_basename_mask = $mask !~ m{[/\\]}s && $mask !~ m{\*\*}s;
$mask = "\Q$mask";
$mask =~ s{\\\*\\\*}{.*}sg;
$mask =~ s{\\\*}{[^/\\\\]*}sg;
if ($is_basename_mask) {
$mask = '(?:[/\\\\]|^)' . $mask . '(?:[/\\\\]|$)';
} else {
# Rel path to match with such mask is always started with "./",
# but before matching the first character is cut. So when we
# check rel path like "./aaa/bbb" to be matched by "aaa/b*" mask,