Importing bin/ln
Change-Id: I318e79f2d02dcff10bda8af335d286a78be5c5a2
This commit is contained in:
Lionel Sambuc
parent
7104bb23a9
commit
c31c70743a
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@ -1,7 +1,7 @@
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# $NetBSD: Makefile,v 1.22 2007/12/31 15:31:24 ad Exp $
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# @(#)Makefile 8.1 (Berkeley) 5/31/93
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SUBDIR= cat date echo ed expr kill \
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SUBDIR= cat date echo ed expr kill ln \
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mkdir pax pwd rm rmdir test
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.include <bsd.subdir.mk>
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@ -0,0 +1,7 @@
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# $NetBSD: Makefile,v 1.10 1999/09/27 17:44:50 jdolecek Exp $
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# @(#)Makefile 8.2 (Berkeley) 5/31/93
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PROG= ln
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MAN= ln.1
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.include <bsd.prog.mk>
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@ -0,0 +1,173 @@
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.\" $NetBSD: ln.1,v 1.25 2012/03/22 07:58:17 wiz Exp $
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.\"
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.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" @(#)ln.1 8.2 (Berkeley) 12/30/93
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.\"
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.Dd October 29, 2007
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.Dt LN 1
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.Os
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.Sh NAME
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.Nm ln
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.Nd make links
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.Sh SYNOPSIS
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.Nm
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.Op Fl fhinsv
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.Ar source_file
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.Op Ar target_file
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.Nm
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.Op Fl fhinsv
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.Ar source_file ... target_dir
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.Sh DESCRIPTION
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The
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.Nm
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utility creates a new directory entry (linked file) which has the
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same modes as the original file.
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It is useful for maintaining multiple copies of a file in many places
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at once without using up storage for the
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.Dq copies ;
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instead, a link
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.Dq points
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to the original copy.
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There are two types of links: hard links and symbolic links.
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How a link
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.Dq points
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to a file is one of the differences between a hard or symbolic link.
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.Pp
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The options are as follows:
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.Bl -tag -width flag
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.It Fl f
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Unlink any already existing file, permitting the link to occur.
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.It Fl h
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If the
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.Ar target_file
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or
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.Ar target_dir
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is a symbolic link, do not follow it.
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This is most useful with the
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.Fl f
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option, to replace a symlink which may point to a directory.
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.It Fl i
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Cause
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.Nm
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to write a prompt to standard error if the target file exists.
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If the response from the standard input begins with the character
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.Sq Li y
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or
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.Sq Li Y ,
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then unlink the target file so that the link may occur.
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Otherwise, do not attempt the link.
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(The
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.Fl i
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option overrides any previous
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.Fl f
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options.)
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.It Fl n
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Same as
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.Fl h ,
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for compatibility with other
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.Nm
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implementations, namely GNU coreutils.
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.It Fl s
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Create a symbolic link.
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.It Fl v
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Cause
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.Nm
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to be verbose, showing files as they are processed.
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.El
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.Pp
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By default
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.Nm
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makes
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.Em hard
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links.
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A hard link to a file is indistinguishable from the original directory entry;
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any changes to a file are effective independent of the name used to reference
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the file.
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Hard links may not normally refer to directories and may not span file systems.
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.Pp
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A symbolic link contains the name of the file to
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which it is linked.
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The referenced file is used when an
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.Xr open 2
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operation is performed on the link.
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A
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.Xr stat 2
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on a symbolic link will return the linked-to file; an
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.Xr lstat 2
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must be done to obtain information about the link.
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The
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.Xr readlink 2
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call may be used to read the contents of a symbolic link.
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Symbolic links may span file systems and may refer to directories.
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.Pp
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Given one or two arguments,
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.Nm
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creates a link to an existing file
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.Ar source_file .
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If
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.Ar target_file
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is given, the link has that name;
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.Ar target_file
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may also be a directory in which to place the link;
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otherwise it is placed in the current directory.
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If only the directory is specified, the link will be made
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to the last component of
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.Ar source_file .
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.Pp
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Given more than two arguments,
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.Nm
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makes links in
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.Ar target_dir
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to all the named source files.
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The links made will have the same name as the files being linked to.
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.Sh SEE ALSO
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.Xr link 2 ,
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.Xr lstat 2 ,
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.Xr readlink 2 ,
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.Xr stat 2 ,
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.Xr symlink 2 ,
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.Xr symlink 7
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.2-92 .
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.Pp
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The
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.Fl v
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option is an extension to
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.St -p1003.2-92 .
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v6 .
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@ -0,0 +1,230 @@
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/* $NetBSD: ln.c,v 1.35 2011/08/29 14:38:30 joerg Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94";
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#else
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__RCSID("$NetBSD: ln.c,v 1.35 2011/08/29 14:38:30 joerg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static int fflag; /* Unlink existing files. */
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static int hflag; /* Check new name for symlink first. */
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static int iflag; /* Interactive mode. */
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static int sflag; /* Symbolic, not hard, link. */
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static int vflag; /* Verbose output */
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/* System link call. */
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static int (*linkf)(const char *, const char *);
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static char linkch;
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static int linkit(const char *, const char *, int);
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__dead static void usage(void);
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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int ch, exitval;
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char *sourcedir;
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setprogname(argv[0]);
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(void)setlocale(LC_ALL, "");
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while ((ch = getopt(argc, argv, "fhinsv")) != -1)
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switch (ch) {
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'h':
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case 'n':
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hflag = 1;
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break;
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case 'i':
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iflag = 1;
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fflag = 0;
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break;
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case 's':
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sflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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argv += optind;
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argc -= optind;
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if (sflag) {
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linkf = symlink;
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linkch = '-';
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} else {
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linkf = link;
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linkch = '=';
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}
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switch(argc) {
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case 0:
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usage();
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/* NOTREACHED */
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case 1: /* ln target */
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exit(linkit(argv[0], ".", 1));
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/* NOTREACHED */
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case 2: /* ln target source */
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exit(linkit(argv[0], argv[1], 0));
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/* NOTREACHED */
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}
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/* ln target1 target2 directory */
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sourcedir = argv[argc - 1];
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if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) {
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/* we were asked not to follow symlinks, but found one at
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the target--simulate "not a directory" error */
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errno = ENOTDIR;
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err(EXIT_FAILURE, "%s", sourcedir);
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/* NOTREACHED */
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}
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if (stat(sourcedir, &sb)) {
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err(EXIT_FAILURE, "%s", sourcedir);
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/* NOTREACHED */
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}
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if (!S_ISDIR(sb.st_mode)) {
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usage();
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/* NOTREACHED */
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}
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for (exitval = 0; *argv != sourcedir; ++argv)
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exitval |= linkit(*argv, sourcedir, 1);
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exit(exitval);
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/* NOTREACHED */
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}
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static int
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linkit(const char *target, const char *source, int isdir)
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{
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struct stat sb;
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const char *p;
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char path[MAXPATHLEN];
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int ch, exists, first;
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if (!sflag) {
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/* If target doesn't exist, quit now. */
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if (stat(target, &sb)) {
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warn("%s", target);
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return (1);
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}
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}
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/* If the source is a directory (and not a symlink if hflag),
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append the target's name. */
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if (isdir ||
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(!lstat(source, &sb) && S_ISDIR(sb.st_mode)) ||
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(!hflag && !stat(source, &sb) && S_ISDIR(sb.st_mode))) {
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if ((p = strrchr(target, '/')) == NULL)
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p = target;
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else
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++p;
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(void)snprintf(path, sizeof(path), "%s/%s", source, p);
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source = path;
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}
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exists = !lstat(source, &sb);
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/*
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* If the file exists, then unlink it forcibly if -f was specified
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* and interactively if -i was specified.
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*/
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if (fflag && exists) {
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if (unlink(source)) {
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warn("%s", source);
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return (1);
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}
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} else if (iflag && exists) {
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fflush(stdout);
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(void)fprintf(stderr, "replace %s? ", source);
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first = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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if (first != 'y' && first != 'Y') {
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(void)fprintf(stderr, "not replaced\n");
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return (1);
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}
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if (unlink(source)) {
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warn("%s", source);
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return (1);
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}
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}
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/* Attempt the link. */
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if ((*linkf)(target, source)) {
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warn("%s", source);
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return (1);
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}
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if (vflag)
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(void)printf("%s %c> %s\n", source, linkch, target);
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return (0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage:\t%s [-fhinsv] file1 file2\n\t%s [-fhinsv] file ... directory\n",
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getprogname(), getprogname());
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exit(1);
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/* NOTREACHED */
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}
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@ -5,7 +5,6 @@ BINDIR= /bin
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MAN=
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LINKS+= ${BINDIR}/cp ${BINDIR}/mv
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LINKS+= ${BINDIR}/cp ${BINDIR}/ln
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LINKS+= ${BINDIR}/cp ${BINDIR}/clone
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LINKS+= ${BINDIR}/cp ${BINDIR}/cpdir
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@ -1,3 +1,16 @@
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20130201:
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Replace our native ln with NetBSD version.
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As our native ln is a hard link to cp, simply overwriting ln with
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the new version would cause mv, cp, etc to stop working.
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Do this BEFORE a 'make build':
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# rm /bin/ln
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# cp /bin/cp /bin/ln
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Then 'make build' as usual.
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20130130:
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With the shell update, and following update of 'test', some
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modifications are needed in .profile and .ashrc.
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@ -12,6 +12,7 @@
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2012/01/16 18:47:57,bin/ed
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2012/10/17 12:00:00,bin/expr
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2012/10/17 12:00:00,bin/kill
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2012/10/17 12:00:00,bin/ln
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2012/10/17 12:00:00,bin/Makefile
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2012/10/17 12:00:00,bin/Makefile.inc
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2008/07/20 00:52:40,bin/mkdir
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