Date: Fri, 23 Jan 2009 11:58:25 +0000 (UTC) From: Giorgos Keramidas <keramida@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org Subject: svn commit: r187629 - stable/7/bin/ln Message-ID: <200901231158.n0NBwPTG042277@svn.freebsd.org>
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Author: keramida (doc committer) Date: Fri Jan 23 11:58:24 2009 New Revision: 187629 URL: http://svn.freebsd.org/changeset/base/187629 Log: MFC 179603 and 179636 from /head Add a -w warning flag to ln(1). When the -w option is enabled, ln(1) checks to see if the source of a symlink, i.e. the file it should point to actually exists. The default is the old ln behavior, that does not check, to avoid surprising people who may be using ln(1) in scripts or other non-interactive places. PR: bin/7265 Submitted by: Joel Ray Holveck, detlev!joelh at mail.camalott.com Modified: stable/7/bin/ln/ (props changed) stable/7/bin/ln/ln.1 stable/7/bin/ln/ln.c Modified: stable/7/bin/ln/ln.1 ============================================================================== --- stable/7/bin/ln/ln.1 Fri Jan 23 11:54:31 2009 (r187628) +++ stable/7/bin/ln/ln.1 Fri Jan 23 11:58:24 2009 (r187629) @@ -32,7 +32,7 @@ .\" @(#)ln.1 8.2 (Berkeley) 12/30/93 .\" $FreeBSD$ .\" -.Dd February 14, 2006 +.Dd June 6, 2008 .Dt LN 1 .Os .Sh NAME @@ -42,13 +42,13 @@ .Sh SYNOPSIS .Nm .Op Fl s Op Fl F -.Op Fl f | i +.Op Fl f | iw .Op Fl hnv .Ar source_file .Op Ar target_file .Nm .Op Fl s Op Fl F -.Op Fl f | i +.Op Fl f | iw .Op Fl hnv .Ar source_file ... .Ar target_dir @@ -79,6 +79,8 @@ then unlink it so that the link may occu .Fl f option overrides any previous .Fl i +and +.Fl w options.) .It Fl F If the target file already exists and is a directory, then remove it @@ -134,6 +136,8 @@ Create a symbolic link. Cause .Nm to be verbose, showing files as they are processed. +.It Fl w +Warn if the source of a symbolic link does not currently exist. .El .Pp By default, @@ -194,9 +198,10 @@ operation using the two passed arguments The .Fl h , .Fl i , -.Fl n -and +.Fl n , .Fl v +and +.Fl w options are non-standard and their use in scripts is not recommended. They are provided solely for compatibility with other .Nm Modified: stable/7/bin/ln/ln.c ============================================================================== --- stable/7/bin/ln/ln.c Fri Jan 23 11:54:31 2009 (r187628) +++ stable/7/bin/ln/ln.c Fri Jan 23 11:58:24 2009 (r187629) @@ -58,6 +58,8 @@ int hflag; /* Check new name for syml int iflag; /* Interactive mode. */ int sflag; /* Symbolic, not hard, link. */ int vflag; /* Verbose output. */ +int wflag; /* Warn if symlink target does not + * exist, and -f is not enabled. */ /* System link call. */ int (*linkf)(const char *, const char *); char linkch; @@ -92,7 +94,7 @@ main(int argc, char *argv[]) exit(linkit(argv[0], argv[1], 0)); } - while ((ch = getopt(argc, argv, "Ffhinsv")) != -1) + while ((ch = getopt(argc, argv, "Ffhinsvw")) != -1) switch (ch) { case 'F': Fflag = 1; @@ -100,6 +102,7 @@ main(int argc, char *argv[]) case 'f': fflag = 1; iflag = 0; + wflag = 0; break; case 'h': case 'n': @@ -115,6 +118,9 @@ main(int argc, char *argv[]) case 'v': vflag = 1; break; + case 'w': + wflag = 1; + break; case '?': default: usage(); @@ -127,8 +133,10 @@ main(int argc, char *argv[]) linkch = sflag ? '-' : '='; if (sflag == 0) Fflag = 0; - if (Fflag == 1 && iflag == 0) + if (Fflag == 1 && iflag == 0) { fflag = 1; + wflag = 0; /* Implied when fflag != 0 */ + } switch(argc) { case 0: @@ -167,6 +175,7 @@ linkit(const char *target, const char *s const char *p; int ch, exists, first; char path[PATH_MAX]; + char wbuf[PATH_MAX]; if (!sflag) { /* If target doesn't exist, quit now. */ @@ -204,6 +213,32 @@ linkit(const char *target, const char *s exists = !lstat(source, &sb); /* + * If the link source doesn't exist, and a symbolic link was + * requested, and -w was specified, give a warning. + */ + if (sflag && wflag) { + if (*source == '/') { + /* Absolute link source. */ + if (stat(source, &sb) != 0) + warn("warning: %s inaccessible", source); + } else { + /* + * Relative symlink source. Try to construct the + * absolute path of the source, by appending `source' + * to the parent directory of the target. + */ + p = strrchr(target, '/'); + if (p != NULL) + p++; + else + p = target; + (void)snprintf(wbuf, sizeof(wbuf), "%.*s%s", + (int)(p - target), target, source); + if (stat(wbuf, &sb) != 0) + warn("warning: %s", source); + } + } + /* * If the file exists, then unlink it forcibly if -f was specified * and interactively if -i was specified. */
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