cp,mv: add --update=none to always skip existing files

Add --update=none which is equivalent to the --no-clobber behavior
from before coreutils 9.2.  I.e. existing files are unconditionally
skipped, and them not being replaced does not affect the exit status.

* src/copy.h [enum Update_type]: A new type to support parameters
to the --update command line option.
[enum Interactive]: Add I_ALWAYS_SKIP.
* src/copy.c: Treat I_ALWAYS_SKIP like I_ALWAYS_NO (-n),
except that we don't fail when skipping.
* src/system.h (emit_update_parameters_note): A new function
to output the description of the new --update parameters.
* src/cp.c (main): Parse --update arguments, ensuring that
-n takes precedence if specified.
(usage): Describe the new option.  Also allude that
-u is related in the -n description.
* src/mv.c: Accept the new --update parameters and
update usage() accordingly.
* doc/coreutils.texi (cp invocation): Describe the new --update
parameters.  Also reference --update from the --no-clobber description.
(mv invocation): Likewise.
* tests/mv/update.sh: Test the new parameters.
* NEWS: Mention the new feature.
Addresses https://bugs.gnu.org/62572

1 files changed, 15 insertions, 1 deletions

diff --git a/src/copy.h b/src/copy.h
index b02aa2bbb..ea5023cdb 100644
--- a/src/copy.h
+++ b/src/copy.h
@@ -57,11 +57,25 @@ enum Reflink_type
   REFLINK_ALWAYS
 };
 
+/* Control how existing destination files are updated.  */
+enum Update_type
+{
+  /* Always update..  */
+  UPDATE_ALL,
+
+  /* Update if dest older.  */
+  UPDATE_OLDER,
+
+  /* Leave existing files.  */
+  UPDATE_NONE,
+};
+
 /* This type is used to help mv (via copy.c) distinguish these cases.  */
 enum Interactive
 {
   I_ALWAYS_YES = 1,
-  I_ALWAYS_NO,
+  I_ALWAYS_NO,       /* Skip and fail.   */
+  I_ALWAYS_SKIP,     /* Skip and ignore. */
   I_ASK_USER,
   I_UNSPECIFIED
 };