SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
SPDX-FileCopyrightText: 2009 Eric Blake <ebb9@byu.net>

SPDX-License-Identifier: GPL-2.0-or-later

touch: add -h to change symlink timestamps, where supported

diff -r -U3 coreutils-5.0.orig/src/touch.c coreutils-5.0/src/touch.c
--- src/touch.c	2002-12-20 20:09:22.000000000 +0000
+++ src/touch.c	2022-05-16 20:31:37.801988595 +0100
@@ -77,6 +77,9 @@
 /* (-r) If nonzero, use times from a reference file. */
 static int use_ref;
 
+/* (-h) If true, change the times of an existing symlink, if possible.  */
+static int no_dereference;
+
 /* (-t) If nonzero, date supplied on command line in POSIX format. */
 static int posix_date;
 
@@ -110,6 +113,7 @@
   {"date", required_argument, 0, 'd'},
   {"file", required_argument, 0, 'r'}, /* FIXME: phase out --file */
   {"reference", required_argument, 0, 'r'},
+  {"no-dereference", no_argument, NULL, 'h'},
   {GETOPT_HELP_OPTION_DECL},
   {GETOPT_VERSION_OPTION_DECL},
   {0, 0, 0, 0}
@@ -138,7 +142,7 @@
   int fd = -1;
   int open_errno = 0;
 
-  if (! no_create)
+  if (! (no_create || no_dereference))
     {
       /* Try to open FILE, creating it if necessary.  */
       fd = open (file, O_WRONLY | O_CREAT | O_NONBLOCK | O_NOCTTY,
@@ -158,7 +162,7 @@
 	 the other one.  If we have the file descriptor already, use fstat.
 	 Otherwise, either we're in no-create mode (and hence didn't call open)
 	 or FILE is inaccessible or a directory, so we have to use stat.  */
-      if (fd != -1 ? fstat (fd, &sbuf) : stat (file, &sbuf))
+      if (fd != -1 ? fstat (fd, &sbuf) : (no_dereference ? lstat (file, &sbuf) : stat (file, &sbuf)))
 	{
 	  if (open_errno)
 	    error (0, open_errno, _("creating %s"), quote (file));
@@ -223,7 +227,7 @@
 	}
       else
 	{
-	  if (no_create && errno == ENOENT)
+	  if ((no_create || no_dereference) && errno == ENOENT)
 	    return 0;
 	  error (0, errno, _("setting times of %s"), quote (file));
 	}
@@ -254,6 +258,9 @@
   -c, --no-create        do not create any files\n\
   -d, --date=STRING      parse STRING and use it instead of current time\n\
   -f                     (ignored)\n\
+  -h, --no-dereference   affect each symbolic link instead of any referenced\n\
+                         file (useful only on systems that can change the\n\
+                         timestamps of a symlink)\n\
   -m                     change only the modification time\n\
 "), stdout);
       fputs (_("\
@@ -289,7 +296,7 @@
 
   change_times = no_create = use_ref = posix_date = flexible_date = 0;
 
-  while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, NULL)) != -1)
+  while ((c = getopt_long (argc, argv, "acd:fhmr:t:", longopts, NULL)) != -1)
     {
       switch (c)
 	{
@@ -315,6 +322,10 @@
 	case 'f':
 	  break;
 
+	case 'h':
+	  no_dereference = true;
+	  break;
+
 	case 'm':
 	  change_times |= CH_MTIME;
 	  break;
@@ -358,7 +369,10 @@
 
   if (use_ref)
     {
-      if (stat (ref_file, &ref_stats))
+      /* Don't use (no_dereference ? lstat : stat) (args), since stat
+         might be an object-like macro.  */
+      if (no_dereference ? lstat (ref_file, &ref_stats)
+          : stat (ref_file, &ref_stats))
 	error (EXIT_FAILURE, errno,
 	       _("failed to get attributes of %s"), quote (ref_file));
       date_set++;