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210 lines
7.6 KiB
210 lines
7.6 KiB
.\" Copyright (c) 2003-2007 Tim Kientzle
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.\" Copyright (c) 2010 Joerg Sonnenberger
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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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.Dd February 2, 2012
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.Dt ARCHIVE_ENTRY_PERMS 3
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.Os
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.Sh NAME
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.Nm archive_entry_gid ,
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.Nm archive_entry_set_gid ,
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.Nm archive_entry_uid ,
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.Nm archive_entry_set_uid ,
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.Nm archive_entry_perm ,
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.Nm archive_entry_set_perm ,
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.Nm archive_entry_strmode ,
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.Nm archive_entry_uname ,
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.Nm archive_entry_uname_w ,
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.Nm archive_entry_set_uname ,
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.Nm archive_entry_copy_uname ,
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.Nm archive_entry_copy_uname_w ,
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.Nm archive_entry_update_uname_utf8 ,
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.Nm archive_entry_gname ,
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.Nm archive_entry_gname_w ,
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.Nm archive_entry_set_gname ,
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.Nm archive_entry_copy_gname ,
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.Nm archive_entry_copy_gname_w ,
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.Nm archive_entry_update_gname_utf8 ,
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.Nm archive_entry_fflags ,
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.Nm archive_entry_fflags_text ,
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.Nm archive_entry_set_fflags ,
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.Nm archive_entry_copy_fflags_text ,
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.Nm archive_entry_copy_fflags_text_w
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.Nd functions for manipulating ownership and permissions in archive entry descriptions
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.Sh LIBRARY
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Streaming Archive Library (libarchive, -larchive)
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.Sh SYNOPSIS
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.In archive_entry.h
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.Ft gid_t
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.Fn archive_entry_gid "struct archive_entry *a"
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.Ft void
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.Fn archive_entry_set_gid "struct archive_entry *a" "gid_t gid"
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.Ft uid_t
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.Fn archive_entry_uid "struct archive_entry *a"
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.Ft void
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.Fn archive_entry_set_uid "struct archive_entry *a" "uid_t uid"
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.Ft mode_t
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.Fn archive_entry_perm "struct archive_entry *a"
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.Ft void
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.Fn archive_entry_set_perm "struct archive_entry *a" "mode_t mode"
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.Ft const char *
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.Fn archive_entry_strmode "struct archive_entry *a"
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.Ft const char *
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.Fn archive_entry_gname "struct archive_entry *a"
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.Ft const wchar_t *
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.Fn archive_entry_gname_w "struct archive_entry *a"
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.Ft void
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.Fn archive_entry_set_gname "struct archive_entry *a" "const char *a"
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.Ft void
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.Fn archive_entry_copy_gname "struct archive_entry *a" "const char *name"
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.Ft void
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.Fn archive_entry_copy_gname_w "struct archive_entry *a" "const wchar_t *name"
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.Ft int
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.Fn archive_entry_update_gname_utf8 "struct archive_entry *a" "const char *name"
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.Ft const char *
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.Fn archive_entry_uname "struct archive_entry *a"
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.Ft const wchar_t *
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.Fn archive_entry_uname_w "struct archive_entry *a"
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.Ft void
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.Fn archive_entry_set_uname "struct archive_entry *a" "const char *name"
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.Ft void
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.Fn archive_entry_copy_uname "struct archive_entry *a" "const char *name"
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.Ft void
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.Fn archive_entry_copy_uname_w "struct archive_entry *a" "const wchar_t *name"
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.Ft int
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.Fn archive_entry_update_uname_utf8 "struct archive_entry *a" "const char *name"
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.Ft void
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.Fo archive_entry_fflags
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.Fa "struct archive_entry *a"
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.Fa "unsigned long *set_bits"
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.Fa "unsigned long *clear_bits"
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.Fc
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.Ft const char *
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.Fn archive_entry_fflags_text "struct archive_entry *a"
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.Ft void
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.Fo archive_entry_set_fflags
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.Fa "struct archive_entry *a"
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.Fa "unsigned long set_bits"
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.Fa "unsigned long clear_bits"
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.Fc
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.Ft const char *
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.Fn archive_entry_copy_fflags_text "struct archive_entry *a" "const char *text"
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.Ft const wchar_t *
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.Fn archive_entry_copy_fflags_text_w "struct archive_entry *a" "const wchar_t *text"
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.Sh DESCRIPTION
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.Ss User id, group id and mode
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The functions
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.Fn archive_entry_uid ,
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.Fn archive_entry_gid ,
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and
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.Fn archive_entry_perm
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can be used to extract the user id, group id and permission from the given entry.
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The corresponding functions
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.Fn archive_entry_set_uid ,
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.Fn archive_entry_set_gid ,
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and
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.Fn archive_entry_set_perm
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store the given user id, group id and permission in the entry.
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The permission is also set as a side effect of calling
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.Fn archive_entry_set_mode .
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.Pp
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.Fn archive_entry_strmode
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returns a string representation of the permission as used by the long mode of
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.Xr ls 1 .
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.Ss User and group name
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User and group names can be provided in one of three different ways:
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.Bl -tag -width "wchar_t *"
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.It char *
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Multibyte strings in the current locale.
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.It wchar_t *
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Wide character strings in the current locale.
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The accessor functions are named
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.Fn XXX_w .
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.It UTF-8
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Unicode strings encoded as UTF-8.
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These are convenience functions to update both the multibyte and wide
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character strings at the same time.
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.El
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.Pp
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.Fn archive_entry_set_XXX
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is an alias for
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.Fn archive_entry_copy_XXX .
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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
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and
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.Fn archive_entry_copy_fflags_text_w
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functions parse the provided text and set 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 \(em including names that follow an unrecognized
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name \(em will be evaluated, and the bitmaps will be set to reflect
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every name that is 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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.Sh SEE ALSO
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.Xr archive_entry 3 ,
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.Xr archive_entry_acl 3 ,
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.Xr archive_read_disk 3 ,
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.Xr archive_write_disk 3 ,
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.Xr libarchive 3
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.Sh BUGS
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The platform types
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.Vt uid_t
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and
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.Vt gid_t
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are often 16 or 32 bit wide.
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In this case it is possible that the ids can not be correctly restored
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from archives and get truncated.
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