os: make chdir() return error

vlib/v/builder/cc.v

@@ -132,7 +132,7 @@ fn (mut v Builder) rebuild_cached_module(vexe string, imp_path string) string {
 		// do run `v build-module x` always in main vfolder; x can be a relative path
 		pwd := os.getwd()
 		vroot := os.dir(vexe)
-		os.chdir(vroot)
+		os.chdir(vroot) or {}
 		boptions := v.pref.build_options.join(' ')
 		rebuild_cmd := '$vexe $boptions build-module $imp_path'
 		vcache.dlog('| Builder.' + @FN, 'vexe: $vexe | imp_path: $imp_path | rebuild_cmd: $rebuild_cmd')
@@ -140,7 +140,7 @@ fn (mut v Builder) rebuild_cached_module(vexe string, imp_path string) string {
 		rebuilded_o := v.pref.cache_manager.exists('.o', imp_path) or {
 			panic('could not rebuild cache module for $imp_path, error: $err.msg')
 		}
-		os.chdir(pwd)
+		os.chdir(pwd) or {}
 		return rebuilded_o
 	}
 	return res
@@ -638,7 +638,7 @@ fn (mut v Builder) cc() {
 			}
 		}
 		//
-		os.chdir(vdir)
+		os.chdir(vdir) or {}
 		tried_compilation_commands << cmd
 		v.show_cc(cmd, response_file, response_file_content)
 		// Run
@@ -649,7 +649,7 @@ fn (mut v Builder) cc() {
 		if v.pref.show_c_output {
 			v.show_c_compiler_output(res)
 		}
-		os.chdir(original_pwd)
+		os.chdir(original_pwd) or {}
 		vcache.dlog('| Builder.' + @FN, '>       v.pref.use_cache: $v.pref.use_cache | v.pref.retry_compilation: $v.pref.retry_compilation')
 		vcache.dlog('| Builder.' + @FN, '>      cmd res.exit_code: $res.exit_code | cmd: $cmd')
 		vcache.dlog('| Builder.' + @FN, '>  response_file_content:\n$response_file_content')
@@ -957,7 +957,7 @@ fn (mut v Builder) build_thirdparty_obj_file(path string, moduleflags []cflag.CF
 	//
 	// prepare for tcc, it needs relative paths to thirdparty/tcc to work:
 	current_folder := os.getwd()
-	os.chdir(os.dir(pref.vexe_path()))
+	os.chdir(os.dir(pref.vexe_path())) or {}
 	//
 	mut all_options := []string{}
 	all_options << v.pref.third_party_option
@@ -970,7 +970,7 @@ fn (mut v Builder) build_thirdparty_obj_file(path string, moduleflags []cflag.CF
 		println('>>> build_thirdparty_obj_files cmd: $cmd')
 	}
 	res := os.execute(cmd)
-	os.chdir(current_folder)
+	os.chdir(current_folder) or {}
 	if res.exit_code != 0 {
 		eprintln('failed thirdparty object build cmd:\n$cmd')
 		verror(res.output)

vlib/v/gen/c/coutput_test.v

@@ -14,7 +14,7 @@ const diff_cmd = diff.find_working_diff_command() or { '' }
 
 fn test_out_files() ? {
 	println(term.colorize(term.green, '> testing whether .out files match:'))
-	os.chdir(vroot)
+	os.chdir(vroot) or {}
 	output_path := os.join_path(os.temp_dir(), 'coutput', 'out')
 	os.mkdir_all(output_path) ?
 	defer {
@@ -82,7 +82,7 @@ fn test_out_files() ? {
 
 fn test_c_must_have_files() ? {
 	println(term.colorize(term.green, '> testing whether `.c.must_have` files match:'))
-	os.chdir(vroot)
+	os.chdir(vroot) or {}
 	output_path := os.join_path(os.temp_dir(), 'coutput', 'c_must_have')
 	os.mkdir_all(output_path) ?
 	defer {

vlib/v/gen/native/macho_test.v

@@ -4,7 +4,7 @@ import v.pref
 import v.ast
 
 fn test_macho() {
-	os.chdir(os.temp_dir())
+	os.chdir(os.temp_dir()) or {}
 	mut g := native.Gen{
 		pref: &pref.Preferences{}
 		out_name: 'test.bin'

vlib/v/tests/inout/compiler_test.v

@@ -13,7 +13,7 @@ fn test_all() {
 	mut total_errors := 0
 	vexe := os.getenv('VEXE')
 	vroot := os.dir(vexe)
-	os.chdir(vroot)
+	os.chdir(vroot) or {}
 	diff_cmd := diff.find_working_diff_command() or { '' }
 	dir := 'vlib/v/tests/inout'
 	files := os.ls(dir) or { panic(err) }

vlib/v/tests/profile/profile_test.v

@@ -10,7 +10,7 @@ fn test_vexe_exists() {
 }
 
 fn test_v_profile_works() {
-	os.chdir(vroot)
+	os.chdir(vroot) or {}
 	program_source := os.join_path(vroot, 'vlib/v/tests/profile/profile_test_1.v')
 	res := os.execute('"$vexe" -profile - run $program_source')
 	// eprintln('res: $res')

vlib/v/tests/repl/runner/runner.v

@@ -117,7 +117,7 @@ pub fn new_options() RunnerOptions {
 	if os.args.len > 1 {
 		files = os.args[1..]
 	} else {
-		os.chdir(os.dir(vexec))
+		os.chdir(os.dir(vexec)) or {}
 		wd = os.getwd()
 		files = os.walk_ext('.', '.repl')
 	}

vlib/v/tests/vmod_parser_test.v

@@ -2,7 +2,7 @@ import v.vmod
 import os
 
 fn test_from_file() {
-	os.chdir(os.dir(os.getenv('VEXE')))
+	os.chdir(os.dir(os.getenv('VEXE'))) or {}
 	data := vmod.from_file('./v.mod') or { panic(err) }
 	assert data.name == 'V'
 	assert data.description == 'The V programming language.'

vlib/v/vcache/vcache_test.v

@@ -95,7 +95,7 @@ fn test_readme_exists_and_is_readable() {
 }
 
 fn testsuite_end() {
-	os.chdir(os.wd_at_startup)
+	os.chdir(os.wd_at_startup) or {}
 	os.rmdir_all(vcache_folder) or {}
 	assert !os.is_dir(vcache_folder)
 }