CMake/Utilities/cmlibarchive/libarchive/archive_read_disk.3

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.Dd April 3, 2017
.Dt ARCHIVE_READ_DISK 3
.Os
.Sh NAME
.Nm archive_read_disk_new ,
.Nm archive_read_disk_set_behavior ,
.Nm archive_read_disk_set_symlink_logical ,
.Nm archive_read_disk_set_symlink_physical ,
.Nm archive_read_disk_set_symlink_hybrid ,
.Nm archive_read_disk_entry_from_file ,
.Nm archive_read_disk_gname ,
.Nm archive_read_disk_uname ,
.Nm archive_read_disk_set_uname_lookup ,
.Nm archive_read_disk_set_gname_lookup ,
.Nm archive_read_disk_set_standard_lookup
.Nd functions for reading objects from disk
.Sh LIBRARY
Streaming Archive Library (libarchive, -larchive)
.Sh SYNOPSIS
.In archive.h
.Ft struct archive *
.Fn archive_read_disk_new "void"
.Ft int
.Fn archive_read_disk_set_behavior "struct archive *" "int"
.Ft int
.Fn archive_read_disk_set_symlink_logical "struct archive *"
.Ft int
.Fn archive_read_disk_set_symlink_physical "struct archive *"
.Ft int
.Fn archive_read_disk_set_symlink_hybrid "struct archive *"
.Ft const char *
.Fn archive_read_disk_gname "struct archive *" "gid_t"
.Ft const char *
.Fn archive_read_disk_uname "struct archive *" "uid_t"
.Ft int
.Fo archive_read_disk_set_gname_lookup
.Fa "struct archive *"
.Fa "void *"
.Fa "const char *(*lookup)(void *, gid_t)"
.Fa "void (*cleanup)(void *)"
.Fc
.Ft int
.Fo archive_read_disk_set_uname_lookup
.Fa "struct archive *"
.Fa "void *"
.Fa "const char *(*lookup)(void *, uid_t)"
.Fa "void (*cleanup)(void *)"
.Fc
.Ft int
.Fn archive_read_disk_set_standard_lookup "struct archive *"
.Ft int
.Fo archive_read_disk_entry_from_file
.Fa "struct archive *"
.Fa "struct archive_entry *"
.Fa "int fd"
.Fa "const struct stat *"
.Fc
.Sh DESCRIPTION
These functions provide an API for reading information about
objects on disk.
In particular, they provide an interface for populating
.Tn struct archive_entry
objects.
.Bl -tag -width indent
.It Fn archive_read_disk_new
Allocates and initializes a
.Tn struct archive
object suitable for reading object information from disk.
.It Fn archive_read_disk_set_behavior
Configures various behavior options when reading entries from disk.
The flags field consists of a bitwise OR of one or more of the
following values:
.Bl -tag -compact -width "indent"
.It Cm ARCHIVE_READDISK_HONOR_NODUMP
Skip files and directories with the nodump file attribute (file flag) set.
By default, the nodump file attribute is ignored.
.It Cm ARCHIVE_READDISK_MAC_COPYFILE
Mac OS X specific.
Read metadata (ACLs and extended attributes) with
.Xr copyfile 3 .
By default, metadata is read using
.Xr copyfile 3 .
.It Cm ARCHIVE_READDISK_NO_ACL
Do not read Access Control Lists.
By default, ACLs are read from disk.
.It Cm ARCHIVE_READDISK_NO_FFLAGS
Do not read file attributes (file flags).
By default, file attributes are read from disk.
See
.Xr chattr 1
.Pq Linux
or
.Xr chflags 1
.Pq FreeBSD, Mac OS X
for more information on file attributes.
.It Cm ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS
Do not traverse mount points.
By default, mount points are traversed.
.It Cm ARCHIVE_READDISK_NO_XATTR
Do not read extended file attributes (xattrs).
By default, extended file attributes are read from disk.
See
.Xr xattr 7
.Pq Linux ,
.Xr xattr 2
.Pq Mac OS X ,
or
.Xr getextattr 8
.Pq FreeBSD
for more information on extended file attributes.
.It Cm ARCHIVE_READDISK_RESTORE_ATIME
Restore access time of traversed files.
By default, access time of traversed files is not restored.
.El
.It Xo
.Fn archive_read_disk_set_symlink_logical ,
.Fn archive_read_disk_set_symlink_physical ,
.Fn archive_read_disk_set_symlink_hybrid
.Xc
This sets the mode used for handling symbolic links.
The
.Dq logical
mode follows all symbolic links.
The
.Dq physical
mode does not follow any symbolic links.
The
.Dq hybrid
mode currently behaves identically to the
.Dq logical
mode.
.It Xo
.Fn archive_read_disk_gname ,
.Fn archive_read_disk_uname
.Xc
Returns a user or group name given a gid or uid value.
By default, these always return a NULL string.
.It Xo
.Fn archive_read_disk_set_gname_lookup ,
.Fn archive_read_disk_set_uname_lookup
.Xc
These allow you to override the functions used for
user and group name lookups.
You may also provide a
.Tn void *
pointer to a private data structure and a cleanup function for
that data.
The cleanup function will be invoked when the
.Tn struct archive
object is destroyed or when new lookup functions are registered.
.It Fn archive_read_disk_set_standard_lookup
This convenience function installs a standard set of user
and group name lookup functions.
These functions use
.Xr getpwuid 3
and
.Xr getgrgid 3
to convert ids to names, defaulting to NULL if the names cannot
be looked up.
These functions also implement a simple memory cache to reduce
the number of calls to
.Xr getpwuid 3
and
.Xr getgrgid 3 .
.It Fn archive_read_disk_entry_from_file
Populates a
.Tn struct archive_entry
object with information about a particular file.
The
.Tn archive_entry
object must have already been created with
.Xr archive_entry_new 3
and at least one of the source path or path fields must already be set.
(If both are set, the source path will be used.)
.Pp
Information is read from disk using the path name from the
.Tn struct archive_entry
object.
If a file descriptor is provided, some information will be obtained using
that file descriptor, on platforms that support the appropriate
system calls.
.Pp
If a pointer to a
.Tn struct stat
is provided, information from that structure will be used instead
of reading from the disk where appropriate.
This can provide performance benefits in scenarios where
.Tn struct stat
information has already been read from the disk as a side effect
of some other operation.
(For example, directory traversal libraries often provide this information.)
.Pp
Where necessary, user and group ids are converted to user and group names
using the currently-registered lookup functions above.
This affects the file ownership fields and ACL values in the
.Tn struct archive_entry
object.
.El
More information about the
.Va struct archive
object and the overall design of the library can be found in the
.Xr libarchive 3
overview.
.Sh EXAMPLES
The following illustrates basic usage of the library by
showing how to use it to copy an item on disk into an archive.
.Bd -literal -offset indent
void
file_to_archive(struct archive *a, const char *name)
{
  char buff[8192];
  size_t bytes_read;
  struct archive *ard;
  struct archive_entry *entry;
  int fd;

  ard = archive_read_disk_new();
  archive_read_disk_set_standard_lookup(ard);
  entry = archive_entry_new();
  fd = open(name, O_RDONLY);
  if (fd < 0)
     return;
  archive_entry_copy_pathname(entry, name);
  archive_read_disk_entry_from_file(ard, entry, fd, NULL);
  archive_write_header(a, entry);
  while ((bytes_read = read(fd, buff, sizeof(buff))) > 0)
    archive_write_data(a, buff, bytes_read);
  archive_write_finish_entry(a);
  archive_read_free(ard);
  archive_entry_free(entry);
}
.Ed
.Sh RETURN VALUES
Most functions return
.Cm ARCHIVE_OK
(zero) on success, or one of several negative
error codes for errors.
Specific error codes include:
.Cm ARCHIVE_RETRY
for operations that might succeed if retried,
.Cm ARCHIVE_WARN
for unusual conditions that do not prevent further operations, and
.Cm ARCHIVE_FATAL
for serious errors that make remaining operations impossible.
.Pp
.Fn archive_read_disk_new
returns a pointer to a newly-allocated
.Tn struct archive
object or NULL if the allocation failed for any reason.
.Pp
.Fn archive_read_disk_gname
and
.Fn archive_read_disk_uname
return
.Tn const char *
pointers to the textual name or NULL if the lookup failed for any reason.
The returned pointer points to internal storage that
may be reused on the next call to either of these functions;
callers should copy the string if they need to continue accessing it.
.\"
.Sh ERRORS
Detailed error codes and textual descriptions are available from the
.Fn archive_errno
and
.Fn archive_error_string
functions.
.\"
.Sh SEE ALSO
.Xr tar 1 ,
.Xr archive_read 3 ,
.Xr archive_util 3 ,
.Xr archive_write 3 ,
.Xr archive_write_disk 3 ,
.Xr libarchive 3
.Sh HISTORY
The
.Nm libarchive
library first appeared in
.Fx 5.3 .
The
.Nm archive_read_disk
interface was added to
.Nm libarchive 2.6
and first appeared in
.Fx 8.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm libarchive
library was written by
.An Tim Kientzle Aq [email protected] .
.Sh BUGS
The
.Dq standard
user name and group name lookup functions are not the defaults because
.Xr getgrgid 3
and
.Xr getpwuid 3
are sometimes too large for particular applications.
The current design allows the application author to use a more
compact implementation when appropriate.
.Pp
The full list of metadata read from disk by
.Fn archive_read_disk_entry_from_file
is necessarily system-dependent.
.Pp
The
.Fn archive_read_disk_entry_from_file
function reads as much information as it can from disk.
Some method should be provided to limit this so that clients who
do not need ACLs, for instance, can avoid the extra work needed
to look up such information.
.Pp
This API should provide a set of methods for walking a directory tree.
That would make it a direct parallel of the
.Xr archive_read 3
API.
When such methods are implemented, the
.Dq hybrid
symbolic link mode will make sense.