File types and functionality. More...

Classes
class	jau::fs::dir_item
	Representing a directory item split into dirname() and basename(). More...

class	jau::fs::file_stats
	Platform agnostic representation of POSIX ::lstat() and ::stat() for a given pathname. More...

struct	jau::fs::mount_ctx

Typedefs
typedef jau::function< void(const dir_item &)>	jau::fs::consume_dir_item
	`void consume_dir_item(const dir_item& item)`

typedef uint64_t	jau::fs::mountflags_t
	Generic flag bit values for mount() `flags`.

typedef jau::function< bool(traverse_event, const file_stats &, size_t)>	jau::fs::path_visitor
	path_visitor jau::FunctionDef definition

typedef int	jau::fs::umountflags_t
	Generic flag bit values for umount() `flags`.

Enumerations
enum class	jau::fs::copy_options : uint16_t { jau::fs::copy_options::none = 0 , jau::fs::copy_options::recursive = 1 << 0 , jau::fs::copy_options::follow_symlinks = 1 << 1 , jau::fs::copy_options::into_existing_dir = 1 << 2 , jau::fs::copy_options::ignore_symlink_errors = 1 << 8 , jau::fs::copy_options::overwrite = 1 << 9 , jau::fs::copy_options::preserve_all = 1 << 10 , jau::fs::copy_options::sync = 1 << 11 , jau::fs::copy_options::verbose = 1 << 15 }
	Filesystem copy options used to copy() path elements. More...

enum class	jau::fs::fmode_t : uint32_t { jau::fs::fmode_t::none = 0 , jau::fs::fmode_t::set_uid = 04000 , jau::fs::fmode_t::set_gid = 02000 , jau::fs::fmode_t::sticky = 01000 , jau::fs::fmode_t::ugs_set = 07000 , jau::fs::fmode_t::read_usr = 00400 , jau::fs::fmode_t::write_usr = 00200 , jau::fs::fmode_t::exec_usr = 00100 , jau::fs::fmode_t::rwx_usr = 00700 , jau::fs::fmode_t::read_grp = 00040 , jau::fs::fmode_t::write_grp = 00020 , jau::fs::fmode_t::exec_grp = 00010 , jau::fs::fmode_t::rwx_grp = 00070 , jau::fs::fmode_t::read_oth = 00004 , jau::fs::fmode_t::write_oth = 00002 , jau::fs::fmode_t::exec_oth = 00001 , jau::fs::fmode_t::rwx_oth = 00007 , jau::fs::fmode_t::rwx_all = 00777 , jau::fs::fmode_t::def_dir_prot = 00750 , jau::fs::fmode_t::def_file_prot = 00640 , jau::fs::fmode_t::protection_mask = 0b00000000000000000000111111111111 , jau::fs::fmode_t::sock = 0b00000000000000000001000000000000 , jau::fs::fmode_t::blk = 0b00000000000000000010000000000000 , jau::fs::fmode_t::chr = 0b00000000000000000100000000000000 , jau::fs::fmode_t::fifo = 0b00000000000000001000000000000000 , jau::fs::fmode_t::dir = 0b00000000000000010000000000000000 , jau::fs::fmode_t::file = 0b00000000000000100000000000000000 , jau::fs::fmode_t::link = 0b00000000000001000000000000000000 , jau::fs::fmode_t::no_access = 0b00100000000000000000000000000000 , jau::fs::fmode_t::not_existing = 0b01000000000000000000000000000000 , jau::fs::fmode_t::type_mask = 0b01100000000001111111000000000000 }
	Generic file type and POSIX protection mode bits as used in file_stats, touch(), mkdir() etc. More...

enum class	jau::fs::mountflags_linux : mountflags_t { jau::fs::mountflags_linux::none = 0 , jau::fs::mountflags_linux::rdonly = 1 , jau::fs::mountflags_linux::nosuid = 2 , jau::fs::mountflags_linux::nodev = 4 , jau::fs::mountflags_linux::noexec = 8 , jau::fs::mountflags_linux::synchronous = 16 , jau::fs::mountflags_linux::remount = 32 , jau::fs::mountflags_linux::mandlock = 64 , jau::fs::mountflags_linux::dirsync = 128 , jau::fs::mountflags_linux::noatime = 1024 , jau::fs::mountflags_linux::nodiratime = 2048 , jau::fs::mountflags_linux::bind = 4096 , jau::fs::mountflags_linux::move = 8192 , jau::fs::mountflags_linux::rec = 16384 , jau::fs::mountflags_linux::silent = 32768 , jau::fs::mountflags_linux::posixacl = 1 << 16 , jau::fs::mountflags_linux::unbindable = 1 << 17 , jau::fs::mountflags_linux::private_ = 1 << 18 , jau::fs::mountflags_linux::slave = 1 << 19 , jau::fs::mountflags_linux::shared = 1 << 20 , jau::fs::mountflags_linux::relatime = 1 << 21 , jau::fs::mountflags_linux::kernmount = 1 << 22 , jau::fs::mountflags_linux::i_version = 1 << 23 , jau::fs::mountflags_linux::strictatime = 1 << 24 , jau::fs::mountflags_linux::lazytime = 1 << 25 , jau::fs::mountflags_linux::active = 1 << 30 , jau::fs::mountflags_linux::nouser = 1UL << 31 }
	Flag bit values for mount() `flags` under GNU/Linux. More...

enum class	jau::fs::traverse_event : uint16_t { jau::fs::traverse_event::none = 0 , jau::fs::traverse_event::symlink = 1 << 0 , jau::fs::traverse_event::file = 1 << 1 , jau::fs::traverse_event::file_symlink = symlink \| file , jau::fs::traverse_event::dir_symlink = 1 << 2 , jau::fs::traverse_event::dir_check_entry = 1 << 7 , jau::fs::traverse_event::dir_entry = 1 << 8 , jau::fs::traverse_event::dir_exit = 1 << 9 , jau::fs::traverse_event::dir_non_recursive = dir_entry \| dir_exit }
	Filesystem traverse event used to call path_visitor for path elements from visit(). More...

enum class	jau::fs::traverse_options : uint16_t { jau::fs::traverse_options::none = 0 , jau::fs::traverse_options::recursive = 1U << 0 , jau::fs::traverse_options::follow_symlinks = 1U << 1 , jau::fs::traverse_options::lexicographical_order = 1U << 2 , jau::fs::traverse_options::dir_check_entry = 1U << 7 , jau::fs::traverse_options::dir_entry = 1U << 8 , jau::fs::traverse_options::dir_exit = 1U << 9 , jau::fs::traverse_options::verbose = 1U << 15 }
	Filesystem traverse options used to visit() path elements. More...

enum class	jau::fs::umountflags_linux : umountflags_t { jau::fs::umountflags_linux::force = 1 , jau::fs::umountflags_linux::detach = 2 , jau::fs::umountflags_linux::expire = 4 , jau::fs::umountflags_linux::nofollow = 8 }
	Flag bit values for umount() `flags` under GNU/Linux. More...

Functions
std::string	jau::fs::absolute (const std::string_view &relpath) noexcept
	Returns the absolute path of given `relpath` if existing, otherwise an empty string.

std::string	jau::fs::basename (const std::string_view &path) noexcept
	Return stripped leading directory components from given path separated by `/`.

bool	jau::fs::chdir (const std::string &path) noexcept
	Change working directory.

bool	jau::fs::compare (const file_stats &source1, const file_stats &source2, const bool verbose=false) noexcept
	Compare the bytes of both files, denoted by source1 and source2.

bool	jau::fs::compare (const std::string &source1, const std::string &source2, const bool verbose=false) noexcept
	Compare the bytes of both files, denoted by source1 and source2.

bool	jau::fs::copy (const std::string &source_path, const std::string &dest_path, const copy_options copts=copy_options::none) noexcept
	Copy the given source_path to dest_path using copy_options.

std::string	jau::fs::dirname (const std::string_view &path) noexcept
	Return stripped last component from given path separated by `/`, excluding the trailing separator `/`.

bool	jau::fs::exists (const std::string &path, bool verbose_on_error=false) noexcept
	Returns true if path exists and is accessible.

int	jau::fs::from_named_fd (const std::string &named_fd) noexcept
	Returns the file descriptor from the given named file descriptor.

std::string	jau::fs::get_cwd () noexcept
	Return the current working directory or empty on failure.

bool	jau::fs::get_dir_content (const int dirfd, const std::string &path, const consume_dir_item &digest) noexcept
	Returns a list of directory elements excluding `.`

bool	jau::fs::get_dir_content (const std::string &path, const consume_dir_item &digest) noexcept
	Returns a list of directory elements excluding `.`

bool	jau::fs::isAbsolute (const std::string_view &path) noexcept
	Returns true if first character is `/` or - in case of Windows - `\\`.

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (copy_options, recursive, follow_symlinks, into_existing_dir, ignore_symlink_errors, overwrite, preserve_all, sync)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (fmode_t, sock, blk, chr, fifo, dir, file, link, no_access, not_existing)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (mountflags_linux, rdonly, nosuid, nodev, noexec, synchronous, remount, mandlock, dirsync, noatime, nodiratime, bind, move, rec, silent, posixacl, unbindable, private_, slave, shared, relatime, kernmount, i_version, strictatime, lazytime, active, nouser)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (traverse_event, symlink, file, dir_check_entry, dir_entry, dir_exit, dir_symlink)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (traverse_options, recursive, follow_symlinks, lexicographical_order, dir_check_entry, dir_entry, dir_exit)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING (umountflags_linux, force, detach, expire, nofollow)

	jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING2 (file_stats::field_t, field_t, type, mode, nlink, uid, gid, atime, mtime, ctime, ino, size, blocks, btime)

std::string	jau::fs::lookup_asset_dir (const char exe_path, const char asset_file, const char *asset_install_subdir) noexcept
	Returns located asset directory if found, otherwise an empty string.

bool	jau::fs::mkdir (const std::string &path, const fmode_t mode=jau::fs::fmode_t::def_dir_prot, const bool verbose=false) noexcept
	Create directory.

mount_ctx	jau::fs::mount (const std::string &source, const std::string &target, const std::string &fs_type, const mountflags_t flags, const std::string &fs_options="")
	Attach the filesystem named in `source` to `target` using the given filesystem source directly.

mount_ctx	jau::fs::mount_image (const std::string &image_path, const std::string &target, const std::string &fs_type, const mountflags_t flags, const std::string &fs_options="")
	Attach the filesystem image named in `image_path` to `target` using an intermediate platform specific filesystem image loop-device.

constexpr ::mode_t	jau::fs::posix_protection_bits (const fmode_t mask) noexcept
	Returns the POSIX protection bits: rwx_all \| set_uid \| set_gid \| sticky, i.e.

bool	jau::fs::remove (const std::string &path, const traverse_options topts=traverse_options::none) noexcept
	Remove the given path.

bool	jau::fs::rename (const std::string &oldpath, const std::string &newpath) noexcept
	Rename oldpath to newpath using POSIX `rename()`, with the following combinations.

void	jau::fs::sync () noexcept
	Synchronizes filesystems, i.e.

std::string	jau::fs::to_named_fd (const int fd) noexcept
	Returns platform dependent named file descriptor of given file descriptor, if supported.

std::string	jau::fs::to_string (const fmode_t mask, const bool show_rwx) noexcept
	Return the string representation of fmode_t.

bool	jau::fs::touch (const std::string &path, const fmode_t mode=jau::fs::fmode_t::def_file_prot) noexcept
	Touch the file with current time and create file if not existing yet.

bool	jau::fs::touch (const std::string &path, const jau::fraction_timespec &atime, const jau::fraction_timespec &mtime, const fmode_t mode=jau::fs::fmode_t::def_file_prot) noexcept
	Touch the file with given atime and mtime and create file if not existing yet.

bool	jau::fs::umount (const mount_ctx &context, const umountflags_t flags)
	Detach the given mount_ctx `context`

bool	jau::fs::umount (const std::string &target, const umountflags_t flags)
	Detach the topmost filesystem mounted on `target` optionally using given `umountflags` options if supported.

bool	jau::fs::visit (const file_stats &item_stats, const traverse_options topts, const path_visitor &visitor, std::vector< int > *dirfds=nullptr) noexcept
	Visit element(s) of a given path, see traverse_options for detailed settings.

bool	jau::fs::visit (const std::string &path, const traverse_options topts, const path_visitor &visitor, std::vector< int > *dirfds=nullptr) noexcept
	Visit element(s) of a given path, see traverse_options for detailed settings.

Detailed Description

File types and functionality.

Typedef Documentation

◆ consume_dir_item

typedef jau::function<void(const dir_item&)> jau::fs::consume_dir_item

void consume_dir_item(const dir_item& item)

Definition at line 676 of file file_util.hpp.

◆ path_visitor

typedef jau::function<bool(traverse_event, const file_stats&, size_t)> jau::fs::path_visitor

path_visitor jau::FunctionDef definition

bool visitor(traverse_event tevt, const file_stats& item_stats, size_t depth)

Depth being the recursive directory depth starting with 1 for the initial directory.

Returning false stops traversal in general but traverse_options::dir_check_entry will only skip traversing the denied directory.

Definition at line 779 of file file_util.hpp.

◆ mountflags_t

typedef uint64_t jau::fs::mountflags_t

Generic flag bit values for mount() flags.

See mount(2) for a detailed description.

Definition at line 1029 of file file_util.hpp.

◆ umountflags_t

typedef int jau::fs::umountflags_t

Generic flag bit values for umount() flags.

See umount(2) for a detailed description.

Definition at line 1121 of file file_util.hpp.

Enumeration Type Documentation

◆ fmode_t

enum class jau::fs::fmode_t : uint32_t

strong

Generic file type and POSIX protection mode bits as used in file_stats, touch(), mkdir() etc.

The POSIX protection mode bits reside in the lower 16-bits and are bit-wise POSIX compliant while the file type bits reside in the upper 16-bits and are platform agnostic.

This enum class type fulfills C++ named requirements: BitmaskType.

See also: file_stats; file_stats::mode()

Enumerator
none	No mode bit set.
set_uid	Protection bit: POSIX S_ISUID.
set_gid	Protection bit: POSIX S_ISGID.
sticky	Protection bit: POSIX S_ISVTX.
ugs_set	Protection bit: POSIX S_ISUID \| S_ISGID \| S_ISVTX.
read_usr	Protection bit: POSIX S_IRUSR.
write_usr	Protection bit: POSIX S_IWUSR.
exec_usr	Protection bit: POSIX S_IXUSR.
rwx_usr	Protection bit: POSIX S_IRWXU.
read_grp	Protection bit: POSIX S_IRGRP.
write_grp	Protection bit: POSIX S_IWGRP.
exec_grp	Protection bit: POSIX S_IXGRP.
rwx_grp	Protection bit: POSIX S_IRWXG.
read_oth	Protection bit: POSIX S_IROTH.
write_oth	Protection bit: POSIX S_IWOTH.
exec_oth	Protection bit: POSIX S_IXOTH.
rwx_oth	Protection bit: POSIX S_IRWXO.
rwx_all	Protection bit: POSIX S_IRWXU \| S_IRWXG \| S_IRWXO or rwx_usr \| rwx_grp \| rwx_oth.
def_dir_prot	Default directory protection bit: Safe default: POSIX S_IRWXU \| S_IRGRP \| S_IXGRP or rwx_usr \| read_grp \| exec_grp.
def_file_prot	Default file protection bit: Safe default: POSIX S_IRUSR \| S_IWUSR \| S_IRGRP or read_usr \| write_usr \| read_grp.
protection_mask	12 bit protection bit mask 07777 for rwx_all \| set_uid \| set_gid \| sticky .
sock	Type: Entity is a socket, might be in combination with link.
blk	Type: Entity is a block device, might be in combination with link.
chr	Type: Entity is a character device, might be in combination with link.
fifo	Type: Entity is a fifo/pipe, might be in combination with link.
dir	Type: Entity is a directory, might be in combination with link.
file	Type: Entity is a file, might be in combination with link.
link	Type: Entity is a symbolic link, might be in combination with file or dir, fifo, chr, blk or sock.
no_access	Type: Entity gives no access to user, exclusive bit.
not_existing	Type: Entity does not exist, exclusive bit.
type_mask	Type mask for sock \| blk \| chr \| fifo \| dir \| file \| link \| no_access \| not_existing.

Definition at line 252 of file file_util.hpp.

◆ traverse_event

enum class jau::fs::traverse_event : uint16_t

strong

Filesystem traverse event used to call path_visitor for path elements from visit().

This enum class type fulfills C++ named requirements: BitmaskType.

See also: path_visitor; visit()

Enumerator
none	No value, neither file, symlink nor dir_entry or dir_exit. Implying an error state in file_stat, e.g. !file_stats::has_access().
symlink	Visiting a symbolic-link, either to a file or a non-existing entity. Not followed symbolic-links to a directory is expressed via dir_symlink. In case of a symbolic-link to an existing file, file is also set, i.e. file_symlink.
file	Visiting a file, may be in conjunction with symlink, i.e. file_symlink.
file_symlink	Visiting a symlink to a file, i.e. symlink \| file
dir_symlink	Visiting a symbolic-link to a directory which is not followed, i.e. traverse_options::follow_symlinks not set.
dir_check_entry	Visiting a directory on entry, see traverse_options::dir_check_entry. This allows the path_visitor to deny traversal into the directory by returning false, otherwise continuing traversal.
dir_entry	Visiting a directory on entry, see traverse_options::dir_entry. If a directory is visited non-recursive, i.e. traverse_options::recursive not set, dir_entry and dir_exit are set, see dir_non_recursive. If a directory is a symbolic link which is not followed, i.e. traverse_options::follow_symlinks not set, dir_symlink is used instead.
dir_exit	Visiting a directory on exit, see traverse_options::dir_exit. If a directory is visited non-recursive, i.e. traverse_options::recursive not set, dir_entry and dir_exit are set, see dir_non_recursive. If a directory is a symbolic link which is not followed, i.e. traverse_options::follow_symlinks not set, dir_symlink is used instead.
dir_non_recursive	Visiting a directory non-recursive, i.e. traverse_options::recursive not set. Value is a bit-mask of dir_entry \| dir_exit

Definition at line 709 of file file_util.hpp.

◆ traverse_options

enum class jau::fs::traverse_options : uint16_t

strong

Filesystem traverse options used to visit() path elements.

This enum class type fulfills C++ named requirements: BitmaskType.

See also: visit(); remove()

Enumerator
none	No option set.
recursive	Traverse through directories, i.e. perform visit, copy, remove etc actions recursively throughout the directory structure.
follow_symlinks	Traverse through symbolic linked directories if traverse_options::recursive is set, i.e. directories with property fmode_t::link set.
lexicographical_order	Traverse through elements in lexicographical order. This might be required when computing an order dependent outcome like a hash value.
dir_check_entry	Call path_visitor at directory entry, allowing path_visitor to skip traversal of this directory if returning false.
dir_entry	Call path_visitor at directory entry. Both, dir_entry and dir_exit can be set, only one or none.
dir_exit	Call path_visitor at directory exit. Both, dir_entry and dir_exit can be set, only one or none.
verbose	Enable verbosity mode, potentially used by a path_visitor implementation like remove().

Definition at line 789 of file file_util.hpp.

◆ copy_options

enum class jau::fs::copy_options : uint16_t

strong

Filesystem copy options used to copy() path elements.

By default, the fmode_t POSIX protection mode bits are preserved while using the caller's uid and gid as well as current timestamps.
Use copy_options::preserve_all to preserve uid and gid if allowed from the caller and access- and modification-timestamps.

This enum class type fulfills C++ named requirements: BitmaskType.

See also: copy()

Enumerator
none	No option set.
recursive	Traverse through directories, i.e. perform visit, copy, remove etc actions recursively throughout the directory structure.
follow_symlinks	Copy referenced symbolic linked files or directories instead of just the symbolic link with property fmode_t::link set.
into_existing_dir	Copy source dir content into an already existing destination directory as if destination directory did not exist. Otherwise, if destination directory already exist, the source directory will be copied below the destination directory.
ignore_symlink_errors	Ignore errors from erroneous symlinks, e.g. non-existing link-targets, recursive loop-errors.or unsupported symmlinks on target filesystem. This flag is required to copy erroneous non-existing symlinks if using follow_symlinks copy erroneous recursive loop-error symlinks if using follow_symlinks ignore symlinks if not supported by target filesystem if not using follow_symlinks
overwrite	Overwrite existing destination files.
preserve_all	Preserve uid and gid if allowed and access- and modification-timestamps, i.e. producing a most exact meta-data copy.
sync	Ensure data and meta-data file synchronization is performed via ::fsync() after asynchronous copy operations of a file's content.
verbose	Enable verbosity mode, show error messages on stderr.

Definition at line 909 of file file_util.hpp.

◆ mountflags_linux

enum class jau::fs::mountflags_linux : mountflags_t

strong

Flag bit values for mount() flags under GNU/Linux.

See mount(2) for a detailed description.

Enumerator
none
rdonly
nosuid
nodev
noexec
synchronous
remount
mandlock
dirsync
noatime
nodiratime
bind
move
rec
silent
posixacl
unbindable
private_
slave
shared
relatime
kernmount
i_version
strictatime
lazytime
active
nouser

Definition at line 1036 of file file_util.hpp.

◆ umountflags_linux

enum class jau::fs::umountflags_linux : umountflags_t

strong

Flag bit values for umount() flags under GNU/Linux.

See umount(2) for a detailed description.

Enumerator
force
detach
expire
nofollow

Definition at line 1128 of file file_util.hpp.

Function Documentation

◆ get_cwd()

std::string jau::fs::get_cwd ( )

noexcept

Return the current working directory or empty on failure.

Definition at line 84 of file file_util.cpp.

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◆ chdir()

bool jau::fs::chdir ( const std::string & path )

noexcept

Change working directory.

Definition at line 100 of file file_util.cpp.

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◆ absolute()

std::string jau::fs::absolute ( const std::string_view & relpath )

noexcept

Returns the absolute path of given relpath if existing, otherwise an empty string.

Parameters

relpath a path, might be relative

Definition at line 104 of file file_util.cpp.

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◆ dirname()

std::string jau::fs::dirname ( const std::string_view & path )

noexcept

Return stripped last component from given path separated by /, excluding the trailing separator /.

If no directory separator / is contained, return ..

If only the root path / is given, return /.

Parameters

path	given path

Returns: leading directory name w/o slash or .

Definition at line 131 of file file_util.cpp.

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◆ basename()

std::string jau::fs::basename ( const std::string_view & path )

noexcept

Return stripped leading directory components from given path separated by /.

If only the root path / is given, return /.

Parameters

path	given path

Returns: last non-slash component or .

Definition at line 153 of file file_util.cpp.

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◆ isAbsolute()

bool jau::fs::isAbsolute ( const std::string_view & path )

noexcept

Returns true if first character is / or - in case of Windows - \\.

Definition at line 174 of file file_util.cpp.

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◆ exists()

bool jau::fs::exists	(	const std::string &	path,
		bool	verbose_on_error = false )

noexcept

Returns true if path exists and is accessible.

Definition at line 179 of file file_util.cpp.

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◆ lookup_asset_dir()

std::string jau::fs::lookup_asset_dir	(	const char *	exe_path,
		const char *	asset_file,
		const char *	asset_install_subdir )

noexcept

Returns located asset directory if found, otherwise an empty string.

The asset dir is attempted as follows (cwd is current working dir)

cwd/resources/asset_file -> cwd/resources
dirname(exe_path)/../share/"+asset_install_subdir/asset_file -> dirname(exe_path)/../share/"+asset_install_subdir

Definition at line 190 of file file_util.cpp.

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [1/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	fmode_t	,
		sock	,
		blk	,
		chr	,
		fifo	,
		dir	,
		file	,
		link	,
		no_access	,
		not_existing	)

◆ to_string()

std::string jau::fs::to_string	(	const fmode_t	mask,
		const bool	show_rwx )

noexcept

Return the string representation of fmode_t.

Parameters

mask	the fmode_t to convert
show_rwx	if true, return verbose POSIX protection bit string representation using `rwx` for user, group and others. Otherwise simply show the octal representation (default)

Returns: the string representation.

Definition at line 385 of file file_util.cpp.

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◆ posix_protection_bits()

::mode_t jau::fs::posix_protection_bits ( const fmode_t mask )

noexcept

Returns the POSIX protection bits: rwx_all | set_uid | set_gid | sticky, i.e.

fmode_t masked with fmode_t::protection_mask.

Definition at line 336 of file file_util.hpp.

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◆ to_named_fd()

std::string jau::fs::to_named_fd ( const int fd )

noexcept

Returns platform dependent named file descriptor of given file descriptor, if supported.

Implementation returns (d stands for integer):

/dev/fd/d (GNU/Linux, FreeBSD, ..)

Following standard POSIX mappings exist

fd 0, /dev/fd/0, /dev/stdin
fd 1, /dev/fd/1, /dev/stdout
fd 2, /dev/fd/2, /dev/stderr
fd [0-99], /dev/fd/[0-99]

Currently implementation always returns above pattern, not handling the target OS differences.

Parameters

fd	file descriptor.

Returns: the named file descriptor or an empty string if fd < 0 or not supported by OS.

See also: jau::fs::from_named_fd(); jau::fs::file_stats:has_fd()

Definition at line 416 of file file_util.cpp.

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◆ from_named_fd()

int jau::fs::from_named_fd ( const std::string & named_fd )

noexcept

Returns the file descriptor from the given named file descriptor.

Detected named file descriptors are (d stands for integer)

/dev/fd/d (GNU/Linux, FreeBSD, ..)
/proc/self/fd/d (GNU/Linux)

Parameters

named_fd the named file descriptor

Returns: file descriptor or -1 if invalid or not supported by OS.

See also: jau::fs::to_named_fd(); jau::fs::file_stats:has_fd()

Definition at line 425 of file file_util.cpp.

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◆ JAU_MAKE_BITFIELD_ENUM_STRING2()

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING2	(	file_stats::field_t	,
		field_t	,
		type	,
		mode	,
		nlink	,
		uid	,
		gid	,
		atime	,
		mtime	,
		ctime	,
		ino	,
		size	,
		blocks	,
		btime	)

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◆ mkdir()

bool jau::fs::mkdir	(	const std::string &	path,
		const fmode_t	mode = jau::fs::fmode_t::def_dir_prot,
		const bool	verbose = false )

noexcept

Create directory.

Parameters

path	full path to new directory
mode	fmode_t POSIX protection bits used, defaults to jau::fs::fmode_t::def_dir_prot
verbose	defaults to false

Returns: true if successful, otherwise false

Definition at line 902 of file file_util.cpp.

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◆ touch() [1/2]

bool jau::fs::touch	(	const std::string &	path,
		const jau::fraction_timespec &	atime,
		const jau::fraction_timespec &	mtime,
		const fmode_t	mode = jau::fs::fmode_t::def_file_prot )

noexcept

Touch the file with given atime and mtime and create file if not existing yet.

Parameters

path	full path to file
atime	new access time
mtime	new modification time
mode	fmode_t POSIX protection bits used, defaults to jau::fs::fmode_t::def_file_prot

Returns: true if successful, otherwise false

Definition at line 924 of file file_util.cpp.

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◆ touch() [2/2]

bool jau::fs::touch	(	const std::string &	path,
		const fmode_t	mode = jau::fs::fmode_t::def_file_prot )

noexcept

Touch the file with current time and create file if not existing yet.

Parameters

path	full path to file
mode	fmode_t POSIX protection bits used, defaults to jau::fs::fmode_t::def_file_prot

Returns: true if successful, otherwise false

Definition at line 942 of file file_util.cpp.

◆ get_dir_content() [1/2]

bool jau::fs::get_dir_content	(	const std::string &	path,
		const consume_dir_item &	digest )

noexcept

Returns a list of directory elements excluding .

and .. for the given path, non recursive.

The custom consume_dir_item digest may also be used to filter the element, besides storing it.

Parameters

path	path to directory
digest	consume_dir_item function to receive each directory item, e.g. `void consume_dir_item(const dir_item& item)`

Returns: true if given path exists, is directory and is readable, otherwise false

Definition at line 959 of file file_util.cpp.

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◆ get_dir_content() [2/2]

bool jau::fs::get_dir_content	(	const int	dirfd,
		const std::string &	path,
		const consume_dir_item &	digest )

noexcept

Returns a list of directory elements excluding .

and .. for the given path, non recursive.

The custom consume_dir_item digest may also be used to filter the element, besides storing it.

Parameters

dirfd	file descriptor to given `path` left untouched as a copy is being used to retrieve the directory content.
path	path to directory
digest	consume_dir_item function to receive each directory item, e.g. `void consume_dir_item(const dir_item& item)`

Returns: true if given path exists, is directory and is readable, otherwise false

Definition at line 977 of file file_util.cpp.

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [2/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	traverse_event	,
		symlink	,
		file	,
		dir_check_entry	,
		dir_entry	,
		dir_exit	,
		dir_symlink	)

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [3/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	traverse_options	,
		recursive	,
		follow_symlinks	,
		lexicographical_order	,
		dir_check_entry	,
		dir_entry	,
		dir_exit	)

◆ visit() [1/2]

bool jau::fs::visit	(	const std::string &	path,
		const traverse_options	topts,
		const path_visitor &	visitor,
		std::vector< int > *	dirfds = nullptr )

noexcept

Visit element(s) of a given path, see traverse_options for detailed settings.

All elements of type fmode_t::file, fmode_t::dir and fmode_t::no_access or fmode_t::not_existing will be visited by the given path_visitor visitor.

Depth passed to path_visitor is the recursive directory depth and starts with 1 for the initial directory.

path_visitor returning false stops traversal in general but traverse_options::dir_check_entry will only skip traversing the denied directory.

Parameters

path	the starting path
topts	given traverse_options for this operation
visitor	path_visitor function `bool visitor(const file_stats& item_stats, size_t depth)`.
dirfds	optional empty `dirfd` stack pointer defaults to nullptr. If user provided, exposes the used `dirfd` stack, which last entry represents the currently visited directory. The `dirfd` stack starts and ends empty, i.e. all directory file descriptor are closed. In case of recursive directory traversion, the initial dir_entry visit starts with depth 1 and 2 fds, its parent and current directory.

Returns: true if successful including no path_visitor stopped traversal by returning false excluding traverse_options::dir_check_entry.

Definition at line 1129 of file file_util.cpp.

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◆ visit() [2/2]

bool jau::fs::visit	(	const file_stats &	item_stats,
		const traverse_options	topts,
		const path_visitor &	visitor,
		std::vector< int > *	dirfds = nullptr )

noexcept

Visit element(s) of a given path, see traverse_options for detailed settings.

All elements of type fmode_t::file, fmode_t::dir and fmode_t::no_access or fmode_t::not_existing will be visited by the given path_visitor visitor.

Depth passed to path_visitor is the recursive directory depth and starts with 1 for the initial directory.

path_visitor returning false stops traversal in general but traverse_options::dir_check_entry will only skip traversing the denied directory.

Parameters

item_stats	pre-fetched file_stats for a given dir_item, used for efficiency
topts	given traverse_options for this operation
visitor	path_visitor function `bool visitor(const file_stats& item_stats, size_t depth)`.
dirfds	optional empty `dirfd` stack pointer defaults to nullptr. If user provided, exposes the used `dirfd` stack, which last entry represents the currently visited directory. The `dirfd` stack starts and ends empty, i.e. all directory file descriptor are closed. In case of recursive directory traversion, the initial dir_entry visit starts with depth 1 and 2 fds, its parent and current directory.

Returns: true if successful including no path_visitor stopped traversal by returning false excluding traverse_options::dir_check_entry.

Definition at line 1091 of file file_util.cpp.

◆ remove()

bool jau::fs::remove	(	const std::string &	path,
		const traverse_options	topts = traverse_options::none )

noexcept

Remove the given path.

If path represents a director, recursive must be set to true.

The given traverse_options options are handled as follows:

traverse_options::parent_dir_last will be added by implementation to operate correct
traverse_options::recursive shall shall be set by caller to remove directories
traverse_options::follow_symlinks shall be set by caller to remove symbolic linked directories recursively, which is kind of dangerous. If not set, only the symbolic link will be removed (default)

Implementation is most data-race-free (DRF), utilizes following safeguards

utilizing parent directory file descriptor and openat() and unlinkat() operations against concurrent mutation

Parameters

path	path to remove
topts	given traverse_options for this operation, defaults to traverse_options::none

Returns: true only if the file or the directory with content has been deleted, otherwise false

Definition at line 1133 of file file_util.cpp.

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◆ compare() [1/2]

bool jau::fs::compare	(	const file_stats &	source1,
		const file_stats &	source2,
		const bool	verbose = false )

noexcept

Compare the bytes of both files, denoted by source1 and source2.

Parameters

source1	first source file to compare
source2	second source file to compare
verbose	defaults to false

Returns: true if both elements are files and their bytes are equal, otherwise false.

Definition at line 1228 of file file_util.cpp.

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◆ compare() [2/2]

bool jau::fs::compare	(	const std::string &	source1,
		const std::string &	source2,
		const bool	verbose = false )

noexcept

Compare the bytes of both files, denoted by source1 and source2.

Parameters

source1	first source file to compare
source2	second source file to compare
verbose	defaults to false

Returns: true if both elements are files and their bytes are equal, otherwise false.

Definition at line 1222 of file file_util.cpp.

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [4/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	copy_options	,
		recursive	,
		follow_symlinks	,
		into_existing_dir	,
		ignore_symlink_errors	,
		overwrite	,
		preserve_all	,
		sync	)

◆ copy()

bool jau::fs::copy	(	const std::string &	source_path,
		const std::string &	dest_path,
		const copy_options	copts = copy_options::none )

noexcept

Copy the given source_path to dest_path using copy_options.

The behavior is similar like POSIX cp commandline tooling.

The following behavior is being followed regarding dest_path:

If source_path is a directory and copy_options::recursive set
- If dest_path doesn't exist, source_path dir content is copied into the newly created dest_path.
- If dest_path exists as a directory, source_path dir will be copied below the dest_path directory if copy_options::into_existing_dir is not set. Otherwise its content is copied into the existing dest_path.
- Everything else is considered an error
If source_path is a file
- If dest_path doesn't exist, source_path file is copied to dest_path as a file.
- If dest_path exists as a directory, source_path file will be copied below the dest_path directory.
- If dest_path exists as a file, copy_options::overwrite must be set to have it overwritten by the source_path file
- Everything else is considered an error

Implementation either uses ::sendfile() if running under GNU/Linux, otherwise POSIX ::read() and write().

Implementation is most data-race-free (DRF), utilizes following safeguards on recursive directory copy

utilizing parent directory file descriptor and openat() operations against concurrent mutation
for each entered directory
- new destination directory is create with '.<random_number>' and user-rwx permissions only
- its file descriptor is being opened
- its user-read permission is dropped, remains user-wx permissions only
- its renamed to destination path
- all copy operations are performed inside
- at exit, its permissions are restored, etc.

See copy_options for details.

Parameters

source_path
dest_path
copts

Returns: true if successful, otherwise false

Definition at line 1663 of file file_util.cpp.

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◆ rename()

bool jau::fs::rename	(	const std::string &	oldpath,
		const std::string &	newpath )

noexcept

Rename oldpath to newpath using POSIX rename(), with the following combinations.

oldpath and newpath refer to the same file, a successful no-operation.
oldpath file
- newpath not-existing file
- newpath existing file to be atomically replaced
oldpath directory
- newpath not-existing directory
- newpath existing empty directory
oldpath symlink will be renamed
newpath symlink will be overwritten

Parameters

oldpath	previous path
newpath	new path

Returns: true only if the rename operation was successful, otherwise false

Definition at line 1859 of file file_util.cpp.

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◆ sync()

void jau::fs::sync ( )

noexcept

Synchronizes filesystems, i.e.

all pending modifications to filesystem metadata and cached file data will be written to the underlying filesystems.

Definition at line 1875 of file file_util.cpp.

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◆ JAU_MAKE_BITFIELD_ENUM_STRING() [5/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	mountflags_linux	,
		rdonly	,
		nosuid	,
		nodev	,
		noexec	,
		synchronous	,
		remount	,
		mandlock	,
		dirsync	,
		noatime	,
		nodiratime	,
		bind	,
		move	,
		rec	,
		silent	,
		posixacl	,
		unbindable	,
		private_	,
		slave	,
		shared	,
		relatime	,
		kernmount	,
		i_version	,
		strictatime	,
		lazytime	,
		active	,
		nouser	)

◆ mount_image()

jau::fs::mount_ctx jau::fs::mount_image	(	const std::string &	image_path,
		const std::string &	target,
		const std::string &	fs_type,
		const mountflags_t	flags,
		const std::string &	fs_options = "" )

Attach the filesystem image named in image_path to target using an intermediate platform specific filesystem image loop-device.

This method either requires root permissions
or the following capabilities: cap_sys_admin,cap_setuid, cap_setgid.

Unmounting shall be done via umount() with mount_ctx argument to ensure all intermediate resources are released.

Parameters

image_path	path of image source file
target	directory where `image_path` filesystem shall be attached to
fs_type	type of filesystem, e.g. `squashfs`, `tmpfs`, `iso9660`, etc.
flags	filesystem agnostic mount flags, see mountflags_linux.
fs_options	comma separated options for the filesystem `fs_type`, see mount(8) for available options for the used filesystem.

Returns: mount_ctx structure containing mounted status etc

See also: mountflags_t; mountflags_linux; mount(); umount()

Definition at line 1887 of file file_util.cpp.

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◆ mount()

mount_ctx jau::fs::mount	(	const std::string &	source,
		const std::string &	target,
		const std::string &	fs_type,
		const mountflags_t	flags,
		const std::string &	fs_options = "" )

Attach the filesystem named in source to target using the given filesystem source directly.

This method either requires root permissions
or the following capabilities: cap_sys_admin,cap_setuid, cap_setgid.

Parameters

source	filesystem path for device, directory, file or dummy-string which shall be attached
target	directory where `source` filesystem shall be attached to
fs_type	type of filesystem, e.g. `squashfs`, `tmpfs`, `iso9660`, etc.
flags	filesystem agnostic mount flags, see mountflags_linux.
fs_options	comma separated options for the filesystem `fs_type`, see mount(8) for available options for the used filesystem.

Returns: mount_ctx structure containing mounted status etc

See also: mountflags_t; mountflags_linux; mount_image(); umount()

Definition at line 2014 of file file_util.cpp.

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◆ JAU_MAKE_BITFIELD_ENUM_STRING() [6/6]

jau::fs::JAU_MAKE_BITFIELD_ENUM_STRING	(	umountflags_linux	,
		force	,
		detach	,
		expire	,
		nofollow	)

◆ umount() [1/2]

bool jau::fs::umount	(	const mount_ctx &	context,
		const umountflags_t	flags )

Detach the given mount_ctx context

This method either requires root permissions
or the following capabilities: cap_sys_admin,cap_setuid, cap_setgid.

Parameters

context	mount_ctx previously attached via mount_image() or mount()
flags	optional umount options, if supported by the system. See umount_options_linux.

Returns: true if successful, otherwise false

See also: umountflags_t; umountflags_linux; mount(); mount_image()

Definition at line 2090 of file file_util.cpp.

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◆ umount() [2/2]

bool jau::fs::umount	(	const std::string &	target,
		const umountflags_t	flags )

Detach the topmost filesystem mounted on target optionally using given umountflags options if supported.

This method either requires root permissions
or the following capabilities: cap_sys_admin,cap_setuid, cap_setgid.

Parameters

target	directory of previously attached filesystem
flags	optional umount options, if supported by the system. See umount_options_linux.

Returns: true if successful, otherwise false

See also: umountflags_t; umountflags_linux; mount(); mount_image()

Definition at line 2176 of file file_util.cpp.

Classes

Typedefs

Enumerations

Functions

Detailed Description

Typedef Documentation

◆ consume_dir_item

◆ path_visitor

◆ mountflags_t

◆ umountflags_t

Enumeration Type Documentation

◆ fmode_t

◆ traverse_event

◆ traverse_options

◆ copy_options

◆ mountflags_linux

◆ umountflags_linux

Function Documentation

◆ get_cwd()

◆ chdir()

◆ absolute()

◆ dirname()

◆ basename()

◆ isAbsolute()

◆ exists()

◆ lookup_asset_dir()

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [1/6]

◆ to_string()

◆ posix_protection_bits()

◆ to_named_fd()

◆ from_named_fd()

◆ JAU_MAKE_BITFIELD_ENUM_STRING2()

◆ mkdir()

◆ touch() [1/2]

◆ touch() [2/2]

◆ get_dir_content() [1/2]

◆ get_dir_content() [2/2]

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [2/6]

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [3/6]

◆ visit() [1/2]

◆ visit() [2/2]

◆ remove()

◆ compare() [1/2]

◆ compare() [2/2]

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [4/6]

◆ copy()

◆ rename()

◆ sync()

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [5/6]

◆ mount_image()

◆ mount()

◆ JAU_MAKE_BITFIELD_ENUM_STRING() [6/6]

◆ umount() [1/2]

◆ umount() [2/2]