###########################################################################
# _ _ ____ _
# Project ___| | | | _ \| |
# / __| | | | |_) | |
# | (__| |_| | _ <| |___
# \___|\___/|_| \_\_____|
#
# Copyright (C) 2016, Evgeny Grin (Karlson2k), <k2k@narod.ru>.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
###########################################################################
# This Perl package helps with path transforming when running curl tests on
# Win32 platform with Msys or Cygwin.
# Three main functions 'sys_native_abs_path', 'sys_native_path' and
# 'build_sys_abs_path' autodetect format of given pathnames. Following formats
# are supported:
# (1) /some/path - absolute path in Unix-style
# (2) D:/some/path - absolute path in Win32-style
# (3) some/path - relative path
# (4) D:some/path - path relative to current directory on Win32 drive (paths
# like 'D:' are treated as 'D:./') (*)
# (5) \some/path - path from root directory on current Win32 drive (*)
# All forward '/' and back '\' slashes are treated identically except leading
# slash in forms (1) and (5).
# Forward slashes are simpler processed in Perl, do not require extra escaping
# for shell (unlike back slashes) and accepted by Win32 native programs, so
# all functions return paths with only forward slashes except
# 'sys_native_path' which returns paths with first forward slash for form (5).
# All returned paths don't contain any duplicated slashes, only single slashes
# are used as directory separators on output.
# On non-Windows platforms functions acts as transparent wrappers for similar
# Perl's functions or return unmodified string (depending on functionality),
# so all functions can be unconditionally used on all platforms.
#
# (*) CAUTION! Forms (4) and (5) are not recommended to use as they can be
# interpreted incorrectly in Perl and Msys/Cygwin environment have low
# control on Win32 current drive and Win32 current path on specific drive.
package pathhelp;
use strict;
use warnings;
use Cwd 'abs_path';
BEGIN {
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(
sys_native_abs_path
sys_native_path
);
our @EXPORT_OK = qw(
build_sys_abs_path
sys_native_current_path
normalize_path
os_is_win
$use_cygpath
should_use_cygpath
drives_mounted_on_cygdrive
);
}
#######################################################################
# Block for cached static variables
#
{
# Cached static variable, Perl 5.0-compatible.
my $is_win = $^O eq 'MSWin32'
|| $^O eq 'cygwin'
|| $^O eq 'msys';
# Returns boolean true if OS is any form of Windows.
sub os_is_win {
return $is_win;
}
# Cached static variable, Perl 5.0-compatible.
my $cygdrive_present;
# Returns boolean true if Win32 drives mounted with '/cygdrive/' prefix.
sub drives_mounted_on_cygdrive {
return $cygdrive_present if defined $cygdrive_present;
$cygdrive_present = ((-e '/cygdrive/') && (-d '/cygdrive/')) ? 1 : 0;
return $cygdrive_present;
}
}
our $use_cygpath; # Only for Win32:
# undef - autodetect
# 1 - use cygpath
# 0 - do not use cygpath
# Returns boolean true if 'cygpath' utility should be used for path conversion.
sub should_use_cygpath {
unless (os_is_win()) {
$use_cygpath = 0;
return 0;
}
return $use_cygpath if defined $use_cygpath;
$use_cygpath = (qx{cygpath -u '.\\' 2>/dev/null} eq "./\n" && $? == 0);
return $use_cygpath;
}
#######################################################################
# Performs path "normalization": all slashes converted to forward
# slashes (except leading slash), all duplicated slashes are replaced
# with single slashes, all relative directories ('./' and '../') are
# resolved if possible.
# Path processed as string, directories are not checked for presence so
# path for not yet existing directory can be "normalized".
#
sub normalize_path;
#######################################################################
# Returns current working directory in Win32 format on Windows.
#
sub sys_native_current_path {
return Cwd::getcwd() unless os_is_win();
my $cur_dir;
if($^O eq 'msys') {
# MSys shell has built-in command.
chomp($cur_dir = `bash -c 'pwd -W'`);
if($? != 0) {
warn "Can't determine Win32 current directory.\n";
return undef;
}
# Add final slash if required.
$cur_dir .= '/' if length($cur_dir) > 3;
}
else {
# Do not use 'cygpath' - it falsely succeed on paths like '/cygdrive'.
$cur_dir = `cmd "/c;" echo %__CD__%`;
if($? != 0 || substr($cur_dir, 0, 1) eq '%') {
warn "Can't determine Win32 current directory.\n";
return undef;
}
# Remove both '\r' and '\n'.
$cur_dir =~ s{\n|\r}{}g;
# Replace back slashes with forward slashes.
$cur_dir =~ s{\\}{/}g;
}
return $cur_dir;
}
#######################################################################
# Returns Win32 current drive letter with colon.
#
sub get_win32_current_drive {
# Notice parameter "/c;" - it's required to turn off Msys's
# transformation of '/c' and compatible with Cygwin.
my $drive_letter = `cmd "/c;" echo %__CD__:~0,2%`;
if($? != 0 || substr($drive_letter, 1, 1) ne ':') {
warn "Can't determine current Win32 drive letter.\n";
return undef;
}
return substr($drive_letter, 0, 2);
}
# Internal function. Converts path by using Msys's built-in transformation.
# Returned path may contain duplicated and back slashes.
sub do_msys_transform;
# Internal function. Gets two parameters: first parameter must be single
# drive letter ('c'), second optional parameter is path relative to drive's
# current working directory. Returns Win32 absolute normalized path.
sub get_abs_path_on_win32_drive;
# Internal function. Tries to find or guess Win32 version of given
# absolute Unix-style path. Other types of paths are not supported.
# Returned paths contain only single forward slashes (no back and
# duplicated slashes).
# Last resort. Used only when other transformations are not available.
sub do_dumb_guessed_transform;
#######################################################################
# Converts given path to system native format, i.e. to Win32 format on
# Windows platform. Relative paths converted to relative, absolute
# paths converted to absolute.
#
sub sys_native_path {
my ($path) = @_;
# Return untouched on non-Windows platforms.
return $path unless (os_is_win());
# Do not process empty path.
return $path if ($path eq '');
if($path =~ s{^([a-zA-Z]):$}{\u$1:}) {
# Path is single drive with colon. (C:)
# This type of paths is not processed correctly by 'cygpath'.
# WARNING!
# Be careful, this relative path can be accidentally transformed
# into wrong absolute path by adding to it some '/dirname' with
# slash at font.
return $path;
}
elsif($path =~ m{^\\} || $path =~ m{^[a-zA-Z]:[^/\\]}) {
# Path is a directory or filename on Win32 current drive or relative
# path on current directory on specific Win32 drive.
# ('\path' or 'D:path')
# First type of paths is not processed by Msys transformation and
# resolved to absolute path by 'cygpath'.
# Second type is not processed by Msys transformation and may be
# incorrectly processed by 'cygpath' (for paths like 'D:..\../.\')
my $first_char = ucfirst(substr($path, 0, 1));
# Replace any back and duplicated slashes with single forward slashes.
$path =~ s{[\\/]+}{/}g;
# Convert leading slash back to forward slash to indicate
# directory on Win32 current drive or capitalize drive letter.
substr($path, 0, 1) = $first_char;
return $path;
}
elsif(should_use_cygpath()) {
# 'cygpath' is available - use it.
# Remove leading duplicated forward and back slashes, as they may
# prevent transforming and may be not processed.
$path =~ s{^([\\/])[\\/]+}{$1}g;
my $has_final_slash = ($path =~ m{[/\\]$});
# Use 'cygpath', '-m' means Win32 path with forward slashes.
chomp($path = `cygpath -m '$path'`);
if ($? != 0) {
warn "Can't convert path by \"cygpath\".\n";
return undef;
}
# 'cygpath' may remove last slash for existing directories.
$path .= '/' if($has_final_slash);
# Remove any duplicated forward slashes (added by 'cygpath' for root
# directories)
$path =~ s{//+}{/}g;
return $path;
}
elsif($^O eq 'msys') {
# Msys transforms automatically path to Windows native form in staring
# program parameters if program is not Msys-based.
$path = do_msys_transform($path);
return undef unless defined $path;
# Capitalize drive letter for Win32 paths.
$path =~ s{^([a-z]:)}{\u$1};
# Replace any back and duplicated slashes with single forward slashes.
$path =~ s{[\\/]+}{/}g;
return $path;
}
elsif($path =~ s{^([a-zA-Z]):[/\\]}{\u$1:/}) {
# Path is already in Win32 form. ('C:\path')
# Replace any back and duplicated slashes with single forward slashes.
$path =~ s{[\\/]+}{/}g;
return $path;
}
elsif($path !~ m{^/}) {
# Path is in relative form. ('path/name', './path' or '../path')
# Replace any back and duplicated slashes with single forward slashes.
$path =~ s{[\\/]+}{/}g;
return $path;
}
# OS is Windows, but not Msys, path is absolute, path is not in Win32
# form and 'cygpath' is not available.
return do_dumb_guessed_transform($path);
}
#######################################################################
# Converts given path to system native absolute path, i.e. to Win32
# absolute format on Windows platform. Both relative and absolute
# formats are supported for input.
#
sub sys_native_abs_path {
my ($path) = @_;
unless(os_is_win()) {
# Convert path to absolute form.
$path = Cwd::abs_path($path);
# Do not process further on non-Windows platforms.
return $path;
}
if($path =~ m{^([a-zA-Z]):($|[^/\\].*$)}) {
# Path is single drive with colon or relative path on Win32 drive.
# ('C:' or 'C:path')
# This kind of relative path is not processed correctly by 'cygpath'.
# Get specified drive letter
return get_abs_path_on_win32_drive($1, $2);
}
elsif($path eq '') {
# Path is empty string. Return current directory.
# Empty string processed correctly by 'cygpath'.
return sys_native_current_path();
}
elsif(should_use_cygpath()) {
# 'cygpath' is available - use it.
my $has_final_slash = ($path =~ m{[\\/]$});
# Remove leading duplicated forward and back slashes, as they may
# prevent transforming and may be not processed.
$path =~ s{^([\\/])[\\/]+}{$1}g;
print "Inter result: \"$path\"\n";
# Use 'cygpath', '-m' means Win32 path with forward slashes,
# '-a' means absolute path
chomp($path = `cygpath -m -a '$path'`);
if($? != 0) {
warn "Can't resolve path by usung \"cygpath\".\n";
return undef;
}
# 'cygpath' may remove last slash for existing directories.
$path .= '/' if($has_final_slash);
# Remove any duplicated forward slashes (added by 'cygpath' for root
# directories)
$path =~ s{//+}{/}g;
return $path
}
elsif($path =~ s{^([a-zA-Z]):[/\\]}{\u$1:/}) {
# Path is already in Win32 form. ('C:\path')
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes, resolve relative dirs.
return normalize_path($path);
}
elsif(substr($path, 0, 1) eq '\\' ) {
# Path is directory or filename on Win32 current drive. ('\Windows')
my $w32drive = get_win32_current_drive();
return undef unless defined $w32drive;
# Combine drive and path.
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes, resolve relative dirs.
return normalize_path($w32drive . $path);
}
unless (substr($path, 0, 1) eq '/') {
# Path is in relative form. Resolve relative directories in Unix form
# *BEFORE* converting to Win32 form otherwise paths like
# '../../../cygdrive/c/windows' will not be resolved.
my $cur_dir = `pwd -L`;
if($? != 0) {
warn "Can't determine current working directory.\n";
return undef;
}
chomp($cur_dir);
$path = $cur_dir . '/' . $path;
}
# Resolve relative dirs.
$path = normalize_path($path);
return undef unless defined $path;
if($^O eq 'msys') {
# Msys transforms automatically path to Windows native form in staring
# program parameters if program is not Msys-based.
$path = do_msys_transform($path);
return undef unless defined $path;
# Replace any back and duplicated slashes with single forward slashes.
$path =~ s{[\\/]+}{/}g;
return $path;
}
# OS is Windows, but not Msys, path is absolute, path is not in Win32
# form and 'cygpath' is not available.
return do_dumb_guessed_transform($path);
}
# Internal function. Converts given Unix-style absolute path to Win32 format.
sub simple_transform_win32_to_unix;
#######################################################################
# Converts given path to build system format absolute path, i.e. to
# Msys/Cygwin Unix-style absolute format on Windows platform. Both
# relative and absolute formats are supported for input.
#
sub build_sys_abs_path {
my ($path) = @_;
unless(os_is_win()) {
# Convert path to absolute form.
$path = Cwd::abs_path($path);
# Do not process further on non-Windows platforms.
return $path;
}
if($path =~ m{^([a-zA-Z]):($|[^/\\].*$)}) {
# Path is single drive with colon or relative path on Win32 drive.
# ('C:' or 'C:path')
# This kind of relative path is not processed correctly by 'cygpath'.
# Get specified drive letter
# Resolve relative dirs in Win32-style path or paths like 'D:/../c/'
# will be resolved incorrectly.
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes.
$path = get_abs_path_on_win32_drive($1, $2);
return undef unless defined $path;
return simple_transform_win32_to_unix($path);
}
elsif($path eq '') {
# Path is empty string. Return current directory.
# Empty string processed correctly by 'cygpath'.
chomp($path = `pwd -L`);
if($? != 0) {
warn "Can't determine Unix-style current working directory.\n";
return undef;
}
# Add final slash if not at root dir.
$path .= '/' if length($path) > 2;
return $path;
}
elsif(should_use_cygpath()) {
# 'cygpath' is avalable - use it.
my $has_final_slash = ($path =~ m{[\\/]$});
# Resolve relative directories, as they may be not resolved for
# Unix-style paths.
# Remove duplicated slashes, as they may be not processed.
$path = normalize_path($path);
return undef unless defined $path;
# Use 'cygpath', '-u' means Unix-stile path,
# '-a' means absolute path
chomp($path = `cygpath -u -a '$path'`);
if($? != 0) {
warn "Can't resolve path by usung \"cygpath\".\n";
return undef;
}
# 'cygpath' removes last slash if path is root dir on Win32 drive.
# Restore it.
$path .= '/' if($has_final_slash &&
substr($path, length($path) - 1, 1) ne '/');
return $path
}
elsif($path =~ m{^[a-zA-Z]:[/\\]}) {
# Path is already in Win32 form. ('C:\path')
# Resolve relative dirs in Win32-style path otherwise paths
# like 'D:/../c/' will be resolved incorrectly.
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes.
$path = normalize_path($path);
return undef unless defined $path;
return simple_transform_win32_to_unix($path);
}
elsif(substr($path, 0, 1) eq '\\') {
# Path is directory or filename on Win32 current drive. ('\Windows')
my $w32drive = get_win32_current_drive();
return undef unless defined $w32drive;
# Combine drive and path.
# Resolve relative dirs in Win32-style path or paths like 'D:/../c/'
# will be resolved incorrectly.
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes.
$path = normalize_path($w32drive . $path);
return undef unless defined $path;
return simple_transform_win32_to_unix($path);
}
# Path is not in any Win32 form.
unless (substr($path, 0, 1) eq '/') {
# Path in relative form. Resolve relative directories in Unix form
# *BEFORE* converting to Win32 form otherwise paths like
# '../../../cygdrive/c/windows' will not be resolved.
my $cur_dir = `pwd -L`;
if($? != 0) {
warn "Can't determine current working directory.\n";
return undef;
}
chomp($cur_dir);
$path = $cur_dir . '/' . $path;
}
return normalize_path($path);
}
#######################################################################
# Performs path "normalization": all slashes converted to forward
# slashes (except leading slash), all duplicated slashes are replaced
# with single slashes, all relative directories ('./' and '../') are
# resolved if possible.
# Path processed as string, directories are not checked for presence so
# path for not yet existing directory can be "normalized".
#
sub normalize_path {
my ($path) = @_;
# Don't process empty paths.
return $path if $path eq '';
unless($path =~ m{(?:^|\\|/)\.{1,2}(?:\\|/|$)}) {
# Speed up processing of simple paths.
my $first_char = substr($path, 0, 1);
$path =~ s{[\\/]+}{/}g;
# Restore starting backslash if any.
substr($path, 0, 1) = $first_char;
return $path;
}
my @arr;
my $prefix;
my $have_root = 0;
# Check whether path starts from Win32 drive. ('C:path' or 'C:\path')
if($path =~ m{^([a-zA-Z]:(/|\\)?)(.*$)}) {
$prefix = $1;
$have_root = 1 if defined $2;
# Process path separately from drive letter.
@arr = split(m{\/|\\}, $3);
# Replace backslash with forward slash if required.
substr($prefix, 2, 1) = '/' if $have_root;
}
else {
if($path =~ m{^(\/|\\)}) {
$have_root = 1;
$prefix = $1;
}
else {
$prefix = '';
}
@arr = split(m{\/|\\}, $path);
}
my $p = 0;
my @res;
for my $el (@arr) {
if(length($el) == 0 || $el eq '.') {
next;
}
elsif($el eq '..' && @res > 0 && $res[$#res] ne '..') {
pop @res;
next;
}
push @res, $el;
}
if($have_root && @res > 0 && $res[0] eq '..') {
warn "Error processing path \"$path\": " .
"Parent directory of root directory does not exist!\n";
return undef;
}
my $ret = $prefix . join('/', @res);
$ret .= '/' if($path =~ m{\\$|/$} && scalar @res > 0);
return $ret;
}
# Internal function. Converts path by using Msys's built-in
# transformation.
sub do_msys_transform {
my ($path) = @_;
return undef if $^O ne 'msys';
return $path if $path eq '';
# Remove leading double forward slashes, as they turn off Msys
# transforming.
$path =~ s{^/[/\\]+}{/};
# Msys transforms automatically path to Windows native form in staring
# program parameters if program is not Msys-based.
# Note: already checked that $path is non-empty.
$path = `cmd //c echo '$path'`;
if($? != 0) {
warn "Can't transform path into Win32 form by using Msys" .
"internal transformation.\n";
return undef;
}
# Remove double quotes, they are added for paths with spaces,
# remove both '\r' and '\n'.
$path =~ s{^\"|\"$|\"\r|\n|\r}{}g;
return $path;
}
# Internal function. Gets two parameters: first parameter must be single
# drive letter ('c'), second optional parameter is path relative to drive's
# current working directory. Returns Win32 absolute normalized path.
sub get_abs_path_on_win32_drive {
my ($drv, $rel_path) = @_;
my $res;
# Get current directory on specified drive.
# "/c;" is compatible with both Msys and Cygwin.
my $cur_dir_on_drv = `cmd "/c;" echo %=$drv:%`;
if($? != 0) {
warn "Can't determine Win32 current directory on drive $drv:.\n";
return undef;
}
if($cur_dir_on_drv =~ m{^[%]}) {
# Current directory on drive is not set, default is
# root directory.
$res = ucfirst($drv) . ':/';
}
else {
# Current directory on drive was set.
# Remove both '\r' and '\n'.
$cur_dir_on_drv =~ s{\n|\r}{}g;
# Append relative path part.
$res = $cur_dir_on_drv . '/';
}
$res .= $rel_path if defined $rel_path;
# Replace any possible back slashes with forward slashes,
# remove any duplicated slashes, resolve relative dirs.
return normalize_path($res);
}
# Internal function. Tries to find or guess Win32 version of given
# absolute Unix-style path. Other types of paths are not supported.
# Returned paths contain only single forward slashes (no back and
# duplicated slashes).
# Last resort. Used only when other transformations are not available.
sub do_dumb_guessed_transform {
my ($path) = @_;
# Replace any possible back slashes and duplicated forward slashes
# with single forward slashes.
$path =~ s{[/\\]+}{/}g;
# Empty path is not valid.
return undef if (length($path) == 0);
# RE to find Win32 drive letter
my $drv_ltr_re = drives_mounted_on_cygdrive() ?
qr{^/cygdrive/([a-zA-Z])($|/.*$)} :
qr{^/([a-zA-Z])($|/.*$)};
# Check path whether path is Win32 directly mapped drive and try to
# transform it assuming that drive letter is matched to Win32 drive letter.
if($path =~ m{$drv_ltr_re}) {
return ucfirst($1) . ':/' if(length($2) == 0);
return ucfirst($1) . ':' . $2;
}
# This may be some custom mapped path. ('/mymount/path')
# Must check longest possible path component as subdir can be mapped to
# different directory. For example '/usr/bin/' can be mapped to '/bin/' or
# '/bin/' can be mapped to '/usr/bin/'.
my $check_path = $path;
my $path_tail = '';
do {
if(-d $check_path) {
my $res =
`(cd "$check_path" && cmd /c "echo %__CD__%") 2>/dev/null`;
if($? == 0 && substr($path, 0, 1) ne '%') {
# Remove both '\r' and '\n'.
$res =~ s{\n|\r}{}g;
# Replace all back slashes with forward slashes.
$res =~ s{\\}{/}g;
if(length($path_tail) > 0) {
return $res . $path_tail;
}
else {
$res =~ s{/$}{} unless $check_path =~ m{/$};
return $res;
}
}
}
if($check_path =~ m{(^.*/)([^/]+/*)}) {
$check_path = $1;
$path_tail = $2 . $path_tail;
}
else {
# Shouldn't happens as root '/' directory should always
# be resolvable.
warn "Can't determine Win32 directory for path \"$path\".\n";
return undef;
}
} while(1);
}
# Internal function. Converts given Unix-style absolute path to Win32 format.
sub simple_transform_win32_to_unix {
my ($path) = @_;
if(should_use_cygpath()) {
# 'cygpath' gives precise result.
my $res;
chomp($res = `cygpath -a -u '$path'`);
if($? != 0) {
warn "Can't determine Unix-style directory for Win32 " .
"directory \"$path\".\n";
return undef;
}
# 'cygpath' removes last slash if path is root dir on Win32 drive.
$res .= '/' if(substr($res, length($res) - 1, 1) ne '/' &&
$path =~ m{[/\\]$});
return $res;
}
# 'cygpath' is not available, use guessed transformation.
unless($path =~ s{^([a-zA-Z]):(?:/|\\)}{/\l$1/}) {
warn "Can't determine Unix-style directory for Win32 " .
"directory \"$path\".\n";
return undef;
}
$path = '/cygdrive' . $path if(drives_mounted_on_cygdrive());
return $path;
}
1; # End of module