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-.\" Copyright (c) 2003-2007 Tim Kientzle
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD: src/lib/libarchive/archive_write_disk.3,v 1.4 2008/09/04 05:22:00 kientzle Exp $
-.\"
-.Dd August 5, 2008
-.Dt archive_write_disk 3
-.Os
-.Sh NAME
-.Nm archive_write_disk_new ,
-.Nm archive_write_disk_set_options ,
-.Nm archive_write_disk_set_skip_file ,
-.Nm archive_write_disk_set_group_lookup ,
-.Nm archive_write_disk_set_standard_lookup ,
-.Nm archive_write_disk_set_user_lookup ,
-.Nm archive_write_header ,
-.Nm archive_write_data ,
-.Nm archive_write_finish_entry ,
-.Nm archive_write_close ,
-.Nm archive_write_finish
-.Nd functions for creating objects on disk
-.Sh SYNOPSIS
-.In archive.h
-.Ft struct archive *
-.Fn archive_write_disk_new "void"
-.Ft int
-.Fn archive_write_disk_set_options "struct archive *" "int flags"
-.Ft int
-.Fn archive_write_disk_set_skip_file "struct archive *" "dev_t" "ino_t"
-.Ft int
-.Fo archive_write_disk_set_group_lookup
-.Fa "struct archive *"
-.Fa "void *"
-.Fa "gid_t (*)(void *, const char *gname, gid_t gid)"
-.Fa "void (*cleanup)(void *)"
-.Fc
-.Ft int
-.Fn archive_write_disk_set_standard_lookup "struct archive *"
-.Ft int
-.Fo archive_write_disk_set_user_lookup
-.Fa "struct archive *"
-.Fa "void *"
-.Fa "uid_t (*)(void *, const char *uname, uid_t uid)"
-.Fa "void (*cleanup)(void *)"
-.Fc
-.Ft int
-.Fn archive_write_header "struct archive *" "struct archive_entry *"
-.Ft ssize_t
-.Fn archive_write_data "struct archive *" "const void *" "size_t"
-.Ft int
-.Fn archive_write_finish_entry "struct archive *"
-.Ft int
-.Fn archive_write_close "struct archive *"
-.Ft int
-.Fn archive_write_finish "struct archive *"
-.Sh DESCRIPTION
-These functions provide a complete API for creating objects on
-disk from
-.Tn struct archive_entry
-descriptions.
-They are most naturally used when extracting objects from an archive
-using the
-.Fn archive_read
-interface.
-The general process is to read
-.Tn struct archive_entry
-objects from an archive, then write those objects to a
-.Tn struct archive
-object created using the
-.Fn archive_write_disk
-family functions.
-This interface is deliberately very similar to the
-.Fn archive_write
-interface used to write objects to a streaming archive.
-.Bl -tag -width indent
-.It Fn archive_write_disk_new
-Allocates and initializes a
-.Tn struct archive
-object suitable for writing objects to disk.
-.It Fn archive_write_disk_set_skip_file
-Records the device and inode numbers of a file that should not be
-overwritten.
-This is typically used to ensure that an extraction process does not
-overwrite the archive from which objects are being read.
-This capability is technically unnecessary but can be a significant
-performance optimization in practice.
-.It Fn archive_write_disk_set_options
-The options field consists of a bitwise OR of one or more of the
-following values:
-.Bl -tag -compact -width "indent"
-.It Cm ARCHIVE_EXTRACT_OWNER
-The user and group IDs should be set on the restored file.
-By default, the user and group IDs are not restored.
-.It Cm ARCHIVE_EXTRACT_PERM
-Full permissions (including SGID, SUID, and sticky bits) should
-be restored exactly as specified, without obeying the
-current umask.
-Note that SUID and SGID bits can only be restored if the
-user and group ID of the object on disk are correct.
-If
-.Cm ARCHIVE_EXTRACT_OWNER
-is not specified, then SUID and SGID bits will only be restored
-if the default user and group IDs of newly-created objects on disk
-happen to match those specified in the archive entry.
-By default, only basic permissions are restored, and umask is obeyed.
-.It Cm ARCHIVE_EXTRACT_TIME
-The timestamps (mtime, ctime, and atime) should be restored.
-By default, they are ignored.
-Note that restoring of atime is not currently supported.
-.It Cm ARCHIVE_EXTRACT_NO_OVERWRITE
-Existing files on disk will not be overwritten.
-By default, existing regular files are truncated and overwritten;
-existing directories will have their permissions updated;
-other pre-existing objects are unlinked and recreated from scratch.
-.It Cm ARCHIVE_EXTRACT_UNLINK
-Existing files on disk will be unlinked before any attempt to
-create them.
-In some cases, this can prove to be a significant performance improvement.
-By default, existing files are truncated and rewritten, but
-the file is not recreated.
-In particular, the default behavior does not break existing hard links.
-.It Cm ARCHIVE_EXTRACT_ACL
-Attempt to restore ACLs.
-By default, extended ACLs are ignored.
-.It Cm ARCHIVE_EXTRACT_FFLAGS
-Attempt to restore extended file flags.
-By default, file flags are ignored.
-.It Cm ARCHIVE_EXTRACT_XATTR
-Attempt to restore POSIX.1e extended attributes.
-By default, they are ignored.
-.It Cm ARCHIVE_EXTRACT_SECURE_SYMLINKS
-Refuse to extract any object whose final location would be altered
-by a symlink on disk.
-This is intended to help guard against a variety of mischief
-caused by archives that (deliberately or otherwise) extract
-files outside of the current directory.
-The default is not to perform this check.
-If
-.Cm ARCHIVE_EXTRACT_UNLINK
-is specified together with this option, the library will
-remove any intermediate symlinks it finds and return an
-error only if such symlink could not be removed.
-.It Cm ARCHIVE_EXTRACT_SECURE_NODOTDOT
-Refuse to extract a path that contains a
-.Pa ..
-element anywhere within it.
-The default is to not refuse such paths.
-Note that paths ending in
-.Pa ..
-always cause an error, regardless of this flag.
-.It Cm ARCHIVE_EXTRACT_SPARSE
-Scan data for blocks of NUL bytes and try to recreate them with holes.
-This results in sparse files, independent of whether the archive format
-supports or uses them.
-.El
-.It Xo
-.Fn archive_write_disk_set_group_lookup ,
-.Fn archive_write_disk_set_user_lookup
-.Xc
-The
-.Tn struct archive_entry
-objects contain both names and ids that can be used to identify users
-and groups.
-These names and ids describe the ownership of the file itself and
-also appear in ACL lists.
-By default, the library uses the ids and ignores the names, but
-this can be overridden by registering user and group lookup functions.
-To register, you must provide a lookup function which
-accepts both a name and id and returns a suitable id.
-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.
-.It Fn archive_write_disk_set_standard_lookup
-This convenience function installs a standard set of user
-and group lookup functions.
-These functions use
-.Xr getpwnam 3
-and
-.Xr getgrnam 3
-to convert names to ids, defaulting to the ids if the names cannot
-be looked up.
-These functions also implement a simple memory cache to reduce
-the number of calls to
-.Xr getpwnam 3
-and
-.Xr getgrnam 3 .
-.It Fn archive_write_header
-Build and write a header using the data in the provided
-.Tn struct archive_entry
-structure.
-See
-.Xr archive_entry 3
-for information on creating and populating
-.Tn struct archive_entry
-objects.
-.It Fn archive_write_data
-Write data corresponding to the header just written.
-Returns number of bytes written or -1 on error.
-.It Fn archive_write_finish_entry
-Close out the entry just written.
-Ordinarily, clients never need to call this, as it
-is called automatically by
-.Fn archive_write_next_header
-and
-.Fn archive_write_close
-as needed.
-.It Fn archive_write_close
-Set any attributes that could not be set during the initial restore.
-For example, directory timestamps are not restored initially because
-restoring a subsequent file would alter that timestamp.
-Similarly, non-writable directories are initially created with
-write permissions (so that their contents can be restored).
-The
-.Nm
-library maintains a list of all such deferred attributes and
-sets them when this function is invoked.
-.It Fn archive_write_finish
-Invokes
-.Fn archive_write_close
-if it was not invoked manually, then releases all resources.
-.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.
-Many of these functions are also documented under
-.Xr archive_write 3 .
-.Sh RETURN VALUES
-Most functions return
-.Cm ARCHIVE_OK
-(zero) on success, or one of several non-zero
-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.
-The
-.Fn archive_errno
-and
-.Fn archive_error_string
-functions can be used to retrieve an appropriate error code and a
-textual error message.
-.Pp
-.Fn archive_write_disk_new
-returns a pointer to a newly-allocated
-.Tn struct archive
-object.
-.Pp
-.Fn archive_write_data
-returns a count of the number of bytes actually written.
-On error, -1 is returned and the
-.Fn archive_errno
-and
-.Fn archive_error_string
-functions will return appropriate values.
-.Sh SEE ALSO
-.Xr archive_read 3 ,
-.Xr archive_write 3 ,
-.Xr tar 1 ,
-.Xr libarchive 3
-.Sh HISTORY
-The
-.Nm libarchive
-library first appeared in
-.Fx 5.3 .
-The
-.Nm archive_write_disk
-interface was added to
-.Nm libarchive 2.0
-and first appeared in
-.Fx 6.3 .
-.Sh AUTHORS
-.An -nosplit
-The
-.Nm libarchive
-library was written by
-.An Tim Kientzle Aq kientzle@acm.org .
-.Sh BUGS
-Directories are actually extracted in two distinct phases.
-Directories are created during
-.Fn archive_write_header ,
-but final permissions are not set until
-.Fn archive_write_close .
-This separation is necessary to correctly handle borderline
-cases such as a non-writable directory containing
-files, but can cause unexpected results.
-In particular, directory permissions are not fully
-restored until the archive is closed.
-If you use
-.Xr chdir 2
-to change the current directory between calls to
-.Fn archive_read_extract
-or before calling
-.Fn archive_read_close ,
-you may confuse the permission-setting logic with
-the result that directory permissions are restored
-incorrectly.
-.Pp
-The library attempts to create objects with filenames longer than
-.Cm PATH_MAX
-by creating prefixes of the full path and changing the current directory.
-Currently, this logic is limited in scope; the fixup pass does
-not work correctly for such objects and the symlink security check
-option disables the support for very long pathnames.
-.Pp
-Restoring the path
-.Pa aa/../bb
-does create each intermediate directory.
-In particular, the directory
-.Pa aa
-is created as well as the final object
-.Pa bb .
-In theory, this can be exploited to create an entire directory heirarchy
-with a single request.
-Of course, this does not work if the
-.Cm ARCHIVE_EXTRACT_NODOTDOT
-option is specified.
-.Pp
-Implicit directories are always created obeying the current umask.
-Explicit objects are created obeying the current umask unless
-.Cm ARCHIVE_EXTRACT_PERM
-is specified, in which case they current umask is ignored.
-.Pp
-SGID and SUID bits are restored only if the correct user and
-group could be set.
-If
-.Cm ARCHIVE_EXTRACT_OWNER
-is not specified, then no attempt is made to set the ownership.
-In this case, SGID and SUID bits are restored only if the
-user and group of the final object happen to match those specified
-in the entry.
-.Pp
-The
-.Dq standard
-user-id and group-id lookup functions are not the defaults because
-.Xr getgrnam 3
-and
-.Xr getpwnam 3
-are sometimes too large for particular applications.
-The current design allows the application author to use a more
-compact implementation when appropriate.
-.Pp
-There should be a corresponding
-.Nm archive_read_disk
-interface that walks a directory heirarchy and returns archive
-entry objects.
\ No newline at end of file