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ARCHIVE_READ_DISK(3) BSD Library Functions Manual
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ARCHIVE_READ_DISK(3)
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NAME
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archive_read_disk_new,
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archive_read_disk_set_behavior,
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archive_read_disk_set_symlink_logical,
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archive_read_disk_set_symlink_physical,
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archive_read_disk_set_symlink_hybrid,
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archive_read_disk_entry_from_file,
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archive_read_disk_gname,
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archive_read_disk_uname,
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archive_read_disk_set_uname_lookup,
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archive_read_disk_set_gname_lookup,
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archive_read_disk_set_standard_lookup —
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functions for reading objects from disk
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LIBRARY
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Streaming Archive Library
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(libarchive, -larchive)
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SYNOPSIS
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#include
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<archive.h>
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struct
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archive *
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archive_read_disk_new(void);
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int
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archive_read_disk_set_behavior(struct archive *,
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int);
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int
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archive_read_disk_set_symlink_logical(struct archive *);
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int
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archive_read_disk_set_symlink_physical(struct archive *);
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int
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archive_read_disk_set_symlink_hybrid(struct archive *);
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const char
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*
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archive_read_disk_gname(struct archive *,
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gid_t);
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const char
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*
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archive_read_disk_uname(struct archive *,
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uid_t);
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int
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archive_read_disk_set_gname_lookup(struct archive *,
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void *,
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const char *(*lookup)(void *, gid_t),
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void (*cleanup)(void *));
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int
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archive_read_disk_set_uname_lookup(struct archive *,
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void *,
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const char *(*lookup)(void *, uid_t),
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void (*cleanup)(void *));
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int
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archive_read_disk_set_standard_lookup(struct archive *);
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int
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archive_read_disk_entry_from_file(struct archive *,
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struct archive_entry *, int fd,
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const struct stat *);
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DESCRIPTION
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These functions provide an API
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for reading information about objects on disk. In
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particular, they provide an interface for populating struct
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archive_entry objects.
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archive_read_disk_new()
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Allocates and initializes a
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struct archive object suitable for reading object
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information from disk.
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archive_read_disk_set_behavior()
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Configures various behavior
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options when reading entries from disk. The flags field
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consists of a bitwise OR of one or more of the following
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values:
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ARCHIVE_READDISK_HONOR_NODUMP
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Skip files and directories with
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the nodump file attribute (file flag) set. By default, the
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nodump file atrribute is ignored.
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ARCHIVE_READDISK_MAC_COPYFILE
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Mac OS X specific. Read
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metadata (ACLs and extended attributes) with copyfile(3). By
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default, metadata is read using copyfile(3).
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ARCHIVE_READDISK_NO_ACL
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Do not read Access Control
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Lists. By default, ACLs are read from disk.
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ARCHIVE_READDISK_NO_FFLAGS
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Do not read file attributes
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(file flags). By default, file attributes are read from
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disk. See chattr(1) (Linux) or chflags(1) (FreeBSD, Mac OS
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X) for more information on file attributes.
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ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS
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Do not traverse mount points.
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By defaut, moint points are traversed.
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ARCHIVE_READDISK_NO_XATTR
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Do not read extended file
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attributes (xattrs). By default, extended file attributes
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are read from disk. See xattr(7) (Linux), xattr(2) (Mac OS
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X), or getextattr(8) (FreeBSD) for more information on
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extended file attributes.
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ARCHIVE_READDISK_RESTORE_ATIME
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Restore access time of
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traversed files. By default, access time of traversed files
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is not restored.
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archive_read_disk_set_symlink_logical(),
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archive_read_disk_set_symlink_physical(),
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archive_read_disk_set_symlink_hybrid()
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This sets the mode used for
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handling symbolic links. The
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’’logical’’ mode follows all
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symbolic links. The ’’physical’’
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mode does not follow any symbolic links. The
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’’hybrid’’ mode currently behaves
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identically to the ’’logical’’
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mode.
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archive_read_disk_gname(),
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archive_read_disk_uname()
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Returns a user or group name
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given a gid or uid value. By default, these always return a
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NULL string.
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archive_read_disk_set_gname_lookup(),
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archive_read_disk_set_uname_lookup()
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These allow you to override the
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functions used for user and group name lookups. You may also
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provide a void * pointer to a private data structure and a
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cleanup function for that data. The cleanup function will be
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invoked when the struct archive object is destroyed or when
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new lookup functions are registered.
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archive_read_disk_set_standard_lookup()
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This convenience function
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installs a standard set of user and group name lookup
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functions. These functions use getpwuid(3) and getgrgid(3)
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to convert ids to names, defaulting to NULL if the names
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cannot be looked up. These functions also implement a simple
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memory cache to reduce the number of calls to getpwuid(3)
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and getgrgid(3).
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archive_read_disk_entry_from_file()
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Populates a struct
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archive_entry object with information about a particular
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file. The archive_entry object must have already been
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created with archive_entry_new(3) and at least one of the
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source path or path fields must already be set. (If both are
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set, the source path will be used.)
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Information is
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read from disk using the path name from the struct
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archive_entry object. If a file descriptor is provided, some
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information will be obtained using that file descriptor, on
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platforms that support the appropriate system calls.
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If a pointer to
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a struct stat is provided, information from that structure
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will be used instead of reading from the disk where
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appropriate. This can provide performance benefits in
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scenarios where struct stat information has already been
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read from the disk as a side effect of some other operation.
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(For example, directory traversal libraries often provide
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this information.)
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Where
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necessary, user and group ids are converted to user and
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group names using the currently registered lookup functions
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above. This affects the file ownership fields and ACL values
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in the struct archive_entry object.
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More information about the
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struct archive object and the overall design of the
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library can be found in the libarchive(3) overview.
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EXAMPLE
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The following illustrates basic
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usage of the library by showing how to use it to copy an
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item on disk into an archive.
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void
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file_to_archive(struct archive *a, const char *name)
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{
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char buff[8192];
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size_t bytes_read;
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struct archive *ard;
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struct archive_entry *entry;
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int fd;
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ard =
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archive_read_disk_new();
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archive_read_disk_set_standard_lookup(ard);
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entry = archive_entry_new();
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fd = open(name, O_RDONLY);
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if (fd < 0)
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return;
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archive_entry_copy_pathname(entry, name);
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archive_read_disk_entry_from_file(ard, entry, fd, NULL);
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archive_write_header(a, entry);
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while ((bytes_read = read(fd, buff, sizeof(buff))) > 0)
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archive_write_data(a, buff, bytes_read);
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archive_write_finish_entry(a);
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archive_read_free(ard);
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archive_entry_free(entry);
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}
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RETURN VALUES
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Most functions return
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ARCHIVE_OK (zero) on success, or one of several
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negative error codes for errors. Specific error codes
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include: ARCHIVE_RETRY for operations that might
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succeed if retried, ARCHIVE_WARN for unusual
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conditions that do not prevent further operations, and
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ARCHIVE_FATAL for serious errors that make remaining
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operations impossible.
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archive_read_disk_new()
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returns a pointer to a newly-allocated struct archive object
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or NULL if the allocation failed for any reason.
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archive_read_disk_gname()
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and archive_read_disk_uname() return const char *
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pointers to the textual name or NULL if the lookup failed
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for any reason. The returned pointer points to internal
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storage that may be reused on the next call to either of
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these functions; callers should copy the string if they need
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to continue accessing it.
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ERRORS
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Detailed error codes and textual
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descriptions are available from the archive_errno()
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and archive_error_string() functions.
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SEE ALSO
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archive_read(3),
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archive_util(3), archive_write(3), archive_write_disk(3),
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tar(1), libarchive(3)
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HISTORY
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The libarchive library
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first appeared in FreeBSD 5.3. The
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archive_read_disk interface was added to
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libarchive 2.6 and first appeared in
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FreeBSD 8.0.
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AUTHORS
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The libarchive library
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was written by Tim Kientzle
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<kientzle@FreeBSD.org>.
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BUGS
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The
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’’standard’’ user name and group
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name lookup functions are not the defaults because
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getgrgid(3) and getpwuid(3) are sometimes too large for
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particular applications. The current design allows the
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application author to use a more compact implementation when
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appropriate.
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The full list of
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metadata read from disk by
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archive_read_disk_entry_from_file() is necessarily
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system-dependent.
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The
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archive_read_disk_entry_from_file() function reads as
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much information as it can from disk. Some method should be
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provided to limit this so that clients who do not need ACLs,
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for instance, can avoid the extra work needed to look up
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such information.
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This API should
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provide a set of methods for walking a directory tree. That
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would make it a direct parallel of the archive_read(3) API.
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When such methods are implemented, the
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’’hybrid’’ symbolic link mode will
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make sense.
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BSD
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April 3, 2017 BSD
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