cp,mv: reinstate that -n exits with success if files skipped

* src/cp.c (main): Adjust so that -n will exit success if skipped files.
* src/mv.c (main): Likewise.
* doc/coreutils.texi (cp invocation): Adjust the description of -n.
* src/system.h (emit_update_parameters_note): Adjust --update=none
comparison.
* tests/cp/cp-i.sh: Adjust -n exit status checks.
* tests/mv/mv-n.sh: Likewise.
* NEWS: Mention the change in behavior.
Fixes https://bugs.gnu.org/62572

NEWS

@@ -43,6 +43,10 @@ GNU coreutils NEWS                                    -*- outline -*-
   basenc --base16 -d now supports lower case hexadecimal characters.
   Previously an error was given for lower case hex digits.
 
+  cp --no-clobber, and mv -n no longer exit with failure status if
+  existing files are encountered in the destination.  Instead they revert
+  to the behavior from before v9.2, silently skipping existing files.
+
   ls --dired now implies long format output without hyperlinks enabled,
   and will take precedence over previously specified formats or hyperlink mode.
 

doc/coreutils.texi

@@ -9057,12 +9057,10 @@ a regular file in the destination tree.
 @itemx --no-clobber
 @opindex -n
 @opindex --no-clobber
-Do not overwrite an existing file; silently fail instead.
-This option overrides a previous
-@option{-i} option.  This option is mutually exclusive with @option{-b} or
-@option{--backup} option.
-See also the @option{--update=none} option which will
-skip existing files but not fail.
+Do not overwrite an existing file; silently skip instead.
+This option overrides a previous @option{-i} option.
+This option is mutually exclusive with @option{-b} or @option{--backup} option.
+See also the @option{--update} option.
 
 @item -P
 @itemx --no-dereference
@@ -9333,8 +9331,8 @@ This is the default operation when an @option{--update} option is not specified,
 and results in all existing files in the destination being replaced.
 
 @item none
-This is similar to the @option{--no-clobber} option, in that no files in the
-destination are replaced, but also skipping a file does not induce a failure.
+This is like the deprecated @option{--no-clobber} option, where no files in the
+destination are replaced, and also skipping a file does not induce a failure.
 
 @item older
 This is the default operation when @option{--update} is specified, and results

src/cp.c

@@ -195,8 +195,8 @@ Copy SOURCE to DEST, or multiple SOURCE(s) to DIRECTORY.\n\
   -L, --dereference            always follow symbolic links in SOURCE\n\
 "), stdout);
       fputs (_("\
-  -n, --no-clobber             ensure no existing files overwritten, and fail\n\
-                                 silently instead. See also --update\n\
+  -n, --no-clobber             silently skip existing files.\n\
+                                 See also --update\n\
 "), stdout);
       fputs (_("\
   -P, --no-dereference         never follow symbolic links in SOURCE\n\
@@ -984,6 +984,7 @@ main (int argc, char **argv)
   char *target_directory = nullptr;
   bool no_target_directory = false;
   char const *scontext = nullptr;
+  bool no_clobber = false;
 
   initialize_main (&argc, &argv);
   set_program_name (argv[0]);
@@ -1074,7 +1075,8 @@ main (int argc, char **argv)
           break;
 
         case 'n':
-          x.interactive = I_ALWAYS_NO;
+          x.interactive = I_ALWAYS_SKIP;
+          no_clobber = true;
           break;
 
         case 'P':
@@ -1140,7 +1142,7 @@ main (int argc, char **argv)
         case 'u':
           if (optarg == nullptr)
             x.update = true;
-          else if (x.interactive != I_ALWAYS_NO)  /* -n takes precedence.  */
+          else if (! no_clobber)  /* -n takes precedence.  */
             {
               enum Update_type update_opt;
               update_opt = XARGMATCH ("--update", optarg,
@@ -1225,10 +1227,10 @@ main (int argc, char **argv)
       usage (EXIT_FAILURE);
     }
 
-  if (x.interactive == I_ALWAYS_NO)
+  if (x.interactive == I_ALWAYS_SKIP)
     x.update = false;
 
-  if (make_backups && x.interactive == I_ALWAYS_NO)
+  if (make_backups && x.interactive == I_ALWAYS_SKIP)
     {
       error (0, 0,
              _("options --backup and --no-clobber are mutually exclusive"));

src/mv.c

@@ -322,6 +322,7 @@ main (int argc, char **argv)
   int n_files;
   char **file;
   bool selinux_enabled = (0 < is_selinux_enabled ());
+  bool no_clobber = false;
 
   initialize_main (&argc, &argv);
   set_program_name (argv[0]);
@@ -353,7 +354,8 @@ main (int argc, char **argv)
           x.interactive = I_ASK_USER;
           break;
         case 'n':
-          x.interactive = I_ALWAYS_NO;
+          x.interactive = I_ALWAYS_SKIP;
+          no_clobber = true;
           break;
         case DEBUG_OPTION:
           x.debug = x.verbose = true;
@@ -375,7 +377,7 @@ main (int argc, char **argv)
         case 'u':
           if (optarg == nullptr)
             x.update = true;
-          else if (x.interactive != I_ALWAYS_NO)  /* -n takes precedence.  */
+          else if (! no_clobber)  /* -n takes precedence.  */
             {
               enum Update_type update_opt;
               update_opt = XARGMATCH ("--update", optarg,
@@ -506,10 +508,10 @@ main (int argc, char **argv)
     for (int i = 0; i < n_files; i++)
       strip_trailing_slashes (file[i]);
 
-  if (x.interactive == I_ALWAYS_NO)
+  if (x.interactive == I_ALWAYS_SKIP)
     x.update = false;
 
-  if (make_backups && x.interactive == I_ALWAYS_NO)
+  if (make_backups && x.interactive == I_ALWAYS_SKIP)
     {
       error (0, 0,
              _("options --backup and --no-clobber are mutually exclusive"));

src/system.h

@@ -596,8 +596,8 @@ emit_update_parameters_note (void)
 UPDATE controls which existing files in the destination are replaced.\n\
 'all' is the default operation when an --update option is not specified,\n\
 and results in all existing files in the destination being replaced.\n\
-'none' is similar to the --no-clobber option, in that no files in the\n\
-destination are replaced, but also skipped files do not induce a failure.\n\
+'none' is like the --no-clobber option, in that no files in the\n\
+destination are replaced, and skipped files do not induce a failure.\n\
 'older' is the default operation when --update is specified, and results\n\
 in files being replaced if they're older than the corresponding source file.\n\
 "), stdout);

tests/cp/cp-i.sh

@@ -29,7 +29,6 @@ echo n | returns_ 1 cp -iR a b 2>/dev/null || fail=1
 # test miscellaneous combinations of -f -i -n parameters
 touch c d || framework_failure_
 echo "'c' -> 'd'" > out_copy || framework_failure_
-echo "cp: not replacing 'd'" > err_skip || framework_failure_
 touch out_empty || framework_failure_
 
 # ask for overwrite, answer no
@@ -45,24 +44,24 @@ echo y | cp -vni c d 2>/dev/null > out3 || fail=1
 compare out3 out_copy  || fail=1
 
 # -n wins over -i
-echo y | returns_ 1 cp -vin c d 2>/dev/null > out4 || fail=1
+echo y | cp -vin c d 2>/dev/null > out4 || fail=1
 compare out4 out_empty || fail=1
 
 # -n wins over -i non verbose
-echo y | returns_ 1 cp -in c d 2>err4 > out4 || fail=1
-compare err4 err_skip || fail=1
+echo y | cp -in c d 2>err4 > out4 || fail=1
+compare /dev/null err4 || fail=1
 compare out4 out_empty || fail=1
 
 # ask for overwrite, answer yes
 echo y | cp -vfi c d 2>/dev/null > out5 || fail=1
 compare out5 out_copy  || fail=1
 
 # do not ask, prevent from overwrite
-echo n | returns_ 1 cp -vfn c d 2>/dev/null > out6 || fail=1
+echo n | cp -vfn c d 2>/dev/null > out6 || fail=1
 compare out6 out_empty || fail=1
 
 # do not ask, prevent from overwrite
-echo n | returns_ 1 cp -vnf c d 2>/dev/null > out7 || fail=1
+echo n | cp -vnf c d 2>/dev/null > out7 || fail=1
 compare out7 out_empty || fail=1
 
 # options --backup and --no-clobber are mutually exclusive

tests/mv/mv-n.sh

@@ -23,7 +23,6 @@ print_ver_ mv
 # test miscellaneous combinations of -f -i -n parameters
 touch a b || framework_failure_
 echo "renamed 'a' -> 'b'" > out_move
-echo "mv: not replacing 'b'" > err_skip || framework_failure_
 > out_empty
 
 # ask for overwrite, answer no
@@ -38,23 +37,23 @@ compare out2 out_move || fail=1
 
 # -n wins (as the last option)
 touch a b || framework_failure_
-echo y | returns_ 1 mv -vin a b 2>/dev/null > out3 || fail=1
+echo y | mv -vin a b 2>/dev/null > out3 || fail=1
 compare out3 out_empty || fail=1
 
 # -n wins (non verbose)
 touch a b || framework_failure_
-echo y | returns_ 1 mv -in a b 2>err3 > out3 || fail=1
+echo y | mv -in a b 2>err3 > out3 || fail=1
 compare out3 out_empty || fail=1
-compare err3 err_skip || fail=1
+compare /dev/null err3 || fail=1
 
 # -n wins (as the last option)
 touch a b || framework_failure_
-echo y | returns_ 1 mv -vfn a b 2>/dev/null > out4 || fail=1
+echo y | mv -vfn a b 2>/dev/null > out4 || fail=1
 compare out4 out_empty || fail=1
 
 # -n wins (as the last option)
 touch a b || framework_failure_
-echo y | returns_ 1 mv -vifn a b 2>/dev/null > out5 || fail=1
+echo y | mv -vifn a b 2>/dev/null > out5 || fail=1
 compare out5 out_empty || fail=1
 
 # options --backup and --no-clobber are mutually exclusive