f81da3e584
* libarchive_test program exercises many of the core features
* Refactored old "read_extract" into new "archive_write_disk", which
uses archive_write methods to put entries onto disk. In particular,
you can now use archive_write_disk to create objects on disk
without having an archive available.
* Pushed some security checks from bsdtar down into libarchive, where
they can be better optimized.
* Rearchitected the logic for creating objects on disk to reduce
the number of system calls. Several common cases now use a
minimum number of system calls.
* Virtualized some internal interfaces to provide a clearer separation
of read and write handling and make it simpler to override key
methods.
* New "empty" format reader.
* Corrected return types (this ABI breakage required the "2.0" version bump)
* Many bug fixes.
345 lines
12 KiB
Groff
345 lines
12 KiB
Groff
.\" Copyright (c) 2003-2007 Tim Kientzle
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 15, 2003
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.Dt archive_entry 3
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.Os
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.Sh NAME
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.Nm archive_entry_acl_add_entry ,
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.Nm archive_entry_acl_add_entry_w ,
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.Nm archive_entry_acl_clear ,
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.Nm archive_entry_acl_count ,
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.Nm archive_entry_acl_next ,
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.Nm archive_entry_acl_next_w ,
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.Nm archive_entry_acl_reset ,
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.Nm archive_entry_acl_text_w ,
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.Nm archive_entry_atime ,
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.Nm archive_entry_atime_nsec ,
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.Nm archive_entry_clear ,
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.Nm archive_entry_clone ,
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.Nm archive_entry_copy_fflags_text_w ,
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.Nm archive_entry_copy_gname_w ,
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.Nm archive_entry_copy_hardlink ,
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.Nm archive_entry_copy_hardlink_w ,
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.Nm archive_entry_copy_pathname_w ,
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.Nm archive_entry_copy_stat ,
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.Nm archive_entry_copy_symlink ,
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.Nm archive_entry_copy_symlink_w ,
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.Nm archive_entry_copy_uname_w ,
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.Nm archive_entry_dev ,
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.Nm archive_entry_fflags ,
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.Nm archive_entry_fflags_text ,
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.Nm archive_entry_free ,
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.Nm archive_entry_gid ,
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.Nm archive_entry_gname ,
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.Nm archive_entry_hardlink ,
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.Nm archive_entry_ino ,
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.Nm archive_entry_mode ,
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.Nm archive_entry_mtime ,
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.Nm archive_entry_mtime_nsec ,
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.Nm archive_entry_new ,
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.Nm archive_entry_pathname ,
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.Nm archive_entry_pathname_w ,
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.Nm archive_entry_rdev ,
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.Nm archive_entry_rdevmajor ,
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.Nm archive_entry_rdevminor ,
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.Nm archive_entry_set_fflags ,
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.Nm archive_entry_set_gid ,
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.Nm archive_entry_set_gname ,
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.Nm archive_entry_set_hardlink ,
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.Nm archive_entry_set_link ,
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.Nm archive_entry_set_mode ,
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.Nm archive_entry_set_mtime ,
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.Nm archive_entry_set_pathname ,
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.Nm archive_entry_set_rdevmajor ,
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.Nm archive_entry_set_rdevminor ,
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.Nm archive_entry_set_size ,
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.Nm archive_entry_set_symlink ,
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.Nm archive_entry_set_uid ,
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.Nm archive_entry_set_uname ,
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.Nm archive_entry_size ,
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.Nm archive_entry_stat ,
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.Nm archive_entry_symlink ,
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.Nm archive_entry_uid ,
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.Nm archive_entry_uname
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.Nd functions for manipulating archive entry descriptions
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.Sh SYNOPSIS
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.In archive_entry.h
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.Ft void
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.Fn archive_entry_acl_add_entry "struct archive_entry *" "int type" "int permset" "int tag" "int qual" "const char *name"
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.Ft void
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.Fn archive_entry_acl_add_entry_w "struct archive_entry *" "int type" "int permset" "int tag" "int qual" "const wchar_t *name"
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.Ft void
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.Fn archive_entry_acl_clear "struct archive_entry *"
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.Ft int
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.Fn archive_entry_acl_count "struct archive_entry *" "int type"
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.Ft int
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.Fn archive_entry_acl_next "struct archive_entry *" "int want_type" "int *type" "int *permset" "int *tag" "int *qual" "const char **name"
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.Ft int
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.Fn archive_entry_acl_next_w "struct archive_entry *" "int want_type" "int *type" "int *permset" "int *tag" "int *qual" "const wchar_t **name"
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.Ft int
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.Fn archive_entry_acl_reset "struct archive_entry *" "int want_type"
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.Ft const wchar_t *
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.Fn archive_entry_acl_text_w "struct archive_entry *" "int flags"
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.Ft time_t
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.Fn archive_entry_atime "struct archive_entry *"
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.Ft long
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.Fn archive_entry_atime_nsec "struct archive_entry *"
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.Ft "struct archive_entry *"
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.Fn archive_entry_clear "struct archive_entry *"
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.Ft struct archive_entry *
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.Fn archive_entry_clone "struct archive_entry *"
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.Ft const wchar_t *
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.Fn archive_entry_copy_fflags_text_w "struct archive_entry *" "const wchar_t *"
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.Ft void
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.Fn archive_entry_copy_gname_w "struct archive_entry *" "const wchar_t *"
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.Ft void
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.Fn archive_entry_copy_hardlink "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_copy_hardlink_w "struct archive_entry *" "const wchar_t *"
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.Ft void
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.Fn archive_entry_copy_pathname_w "struct archive_entry *" "const wchar_t *"
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.Ft void
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.Fn archive_entry_copy_stat "struct archive_entry *" "const struct stat *"
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.Ft void
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.Fn archive_entry_copy_symlink "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_copy_symlink_w "struct archive_entry *" "const wchar_t *"
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.Ft void
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.Fn archive_entry_copy_uname_w "struct archive_entry *" "const wchar_t *"
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.Ft dev_t
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.Fn archive_entry_dev "struct archive_entry *"
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.Ft void
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.Fn archive_entry_fflags "struct archive_entry *" "unsigned long *set" "unsigned long *clear"
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.Ft const char *
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.Fn archive_entry_fflags_text "struct archive_entry *"
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.Ft void
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.Fn archive_entry_free "struct archive_entry *"
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.Ft const char *
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.Fn archive_entry_gname "struct archive_entry *"
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.Ft const char *
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.Fn archive_entry_hardlink "struct archive_entry *"
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.Ft ino_t
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.Fn archive_entry_ino "struct archive_entry *"
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.Ft mode_t
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.Fn archive_entry_mode "struct archive_entry *"
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.Ft time_t
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.Fn archive_entry_mtime "struct archive_entry *"
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.Ft long
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.Fn archive_entry_mtime_nsec "struct archive_entry *"
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.Ft struct archive_entry *
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.Fn archive_entry_new "void"
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.Ft const char *
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.Fn archive_entry_pathname "struct archive_entry *"
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.Ft const wchar_t *
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.Fn archive_entry_pathname_w "struct archive_entry *"
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.Ft dev_t
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.Fn archive_entry_rdev "struct archive_entry *"
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.Ft dev_t
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.Fn archive_entry_rdevmajor "struct archive_entry *"
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.Ft dev_t
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.Fn archive_entry_rdevminor "struct archive_entry *"
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.Ft void
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.Fn archive_entry_set_fflags "struct archive_entry *" "unsigned long set" "unsigned long clear"
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.Ft void
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.Fn archive_entry_set_gid "struct archive_entry *" "gid_t"
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.Ft void
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.Fn archive_entry_set_gname "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_set_hardlink "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_set_link "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_set_mode "struct archive_entry *" "mode_t"
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.Ft void
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.Fn archive_entry_set_mtime "struct archive_entry *" "time_t" "long nanos"
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.Ft void
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.Fn archive_entry_set_pathname "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_set_rdevmajor "struct archive_entry *" "dev_t"
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.Ft void
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.Fn archive_entry_set_rdevminor "struct archive_entry *" "dev_t"
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.Ft void
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.Fn archive_entry_set_size "struct archive_entry *" "int64_t"
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.Ft void
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.Fn archive_entry_set_symlink "struct archive_entry *" "const char *"
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.Ft void
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.Fn archive_entry_set_uid "struct archive_entry *" "uid_t"
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.Ft void
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.Fn archive_entry_set_uname "struct archive_entry *" "const char *"
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.Ft int64_t
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.Fn archive_entry_size "struct archive_entry *"
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.Ft const struct stat *
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.Fn archive_entry_stat "struct archive_entry *"
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.Ft const char *
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.Fn archive_entry_symlink "struct archive_entry *"
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.Ft const char *
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.Fn archive_entry_uname "struct archive_entry *"
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.Sh DESCRIPTION
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These functions create and manipulate data objects that
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represent entries within an archive.
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You can think of a
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.Tn struct archive_entry
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as a heavy-duty version of
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.Tn struct stat :
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it includes everything from
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.Tn struct stat
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plus associated pathname, textual group and user names, etc.
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These objects are used by
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.Xr libarchive 3
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to represent the metadata associated with a particular
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entry in an archive.
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.Ss Create and Destroy
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There are functions to allocate, destroy, clear, and copy
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.Va archive_entry
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objects:
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.Bl -tag -compact -width indent
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.It Fn archive_entry_clear
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Erases the object, resetting all internal fields to the
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same state as a newly-created object.
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This is provided to allow you to quickly recycle objects
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without thrashing the heap.
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.It Fn archive_entry_clone
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A deep copy operation; all text fields are duplicated.
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.It Fn archive_entry_free
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Releases the
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.Tn struct archive_entry
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object.
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.It Fn archive_entry_new
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Allocate and return a blank
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.Tn struct archive_entry
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object.
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.El
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.Ss Set and Get Functions
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Most of the functions here set or read entries in an object.
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Such functions have one of the following forms:
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.Bl -tag -compact -width indent
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.It Fn archive_entry_set_XXXX
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Stores the provided data in the object.
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In particular, for strings, the pointer is stored,
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not the referenced string.
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.It Fn archive_entry_copy_XXXX
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As above, except that the referenced data is copied
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into the object.
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.It Fn archive_entry_XXXX
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Returns the specified data.
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In the case of strings, a const-qualified pointer to
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the string is returned.
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.El
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String data can be set or accessed as wide character strings
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or normal
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.Va char
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strings.
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The functions that use wide character strings are suffixed with
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.Cm _w .
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Note that these are different representations of the same data:
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For example, if you store a narrow string and read the corresponding
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wide string, the object will transparently convert formats
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using the current locale.
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Similarly, if you store a wide string and then store a
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narrow string for the same data, the previously-set wide string will
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be discarded in favor of the new data.
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.Pp
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There are a few set/get functions that merit additional description:
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.Bl -tag -compact -width indent
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.It Fn archive_entry_set_link
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This function sets the symlink field if it is already set.
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Otherwise, it sets the hardlink field.
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.El
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.Ss File Flags
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File flags are transparently converted between a bitmap
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representation and a textual format.
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For example, if you set the bitmap and ask for text, the library
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will build a canonical text format.
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However, if you set a text format and request a text format,
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you will get back the same text, even if it is ill-formed.
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If you need to canonicalize a textual flags string, you should first set the
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text form, then request the bitmap form, then use that to set the bitmap form.
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Setting the bitmap format will clear the internal text representation
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and force it to be reconstructed when you next request the text form.
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.Pp
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The bitmap format consists of two integers, one containing bits
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that should be set, the other specifying bits that should be
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cleared.
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Bits not mentioned in either bitmap will be ignored.
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Usually, the bitmap of bits to be cleared will be set to zero.
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In unusual circumstances, you can force a fully-specified set
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of file flags by setting the bitmap of flags to clear to the complement
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of the bitmap of flags to set.
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(This differs from
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.Xr fflagstostr 3 ,
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which only includes names for set bits.)
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Converting a bitmap to a textual string is a platform-specific
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operation; bits that are not meaningful on the current platform
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will be ignored.
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.Pp
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The canonical text format is a comma-separated list of flag names.
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The
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.Fn archive_entry_copy_fflags_text_w
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function parses the provided text and sets the internal bitmap values.
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This is a platform-specific operation; names that are not meaningful
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on the current platform will be ignored.
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The function returns a pointer to the start of the first name that was not
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recognized, or NULL if every name was recognized.
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Note that every name--including names that follow an unrecognized name--will
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be evaluated, and the bitmaps will be set to reflect every name that is
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recognized.
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(In particular, this differs from
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.Xr strtofflags 3 ,
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which stops parsing at the first unrecognized name.)
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.Ss ACL Handling
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XXX This needs serious help.
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XXX
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.Pp
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An
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.Dq Access Control List
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(ACL) is a list of permissions that grant access to particular users or
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groups beyond what would normally be provided by standard POSIX mode bits.
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The ACL handling here addresses some deficiencies in the POSIX.1e draft 17 ACL
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specification.
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In particular, POSIX.1e draft 17 specifies several different formats, but
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none of those formats include both textual user/group names and numeric
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UIDs/GIDs.
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.Pp
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XXX explain ACL stuff XXX
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.\" .Sh EXAMPLE
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.\" .Sh RETURN VALUES
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.\" .Sh ERRORS
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.Sh SEE ALSO
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.Xr archive 3
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.Sh HISTORY
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The
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.Nm libarchive
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library first appeared in
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.Fx 5.3 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm libarchive
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library was written by
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.An Tim Kientzle Aq kientzle@acm.org .
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.\" .Sh BUGS
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