cp: improve status message when omitting directories

* src/copy.h (cp_options): Add a new flag for install(1).
* src/copy.c (copy_internal): For cp, also output remediation
advice which also indicates why directories aren't copied by default.
The message is unchanged for install(1).
* src/cp.c (cp_option_init): Init install_mode to false.
* src/mv.c (cp_option_init): Likewise.
* src/install.c (cp_option_init): Init install_mode to true.
* tests/install/basic-1.sh: Add a test case.
* tests/cp/link-deref.sh: Adjust test case.
Fixes http://bugs.gnu.org/24958

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mv.c b/src/mv.c
index 6a3d0d277..04d2be3ec 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -114,6 +114,7 @@ cp_option_init (struct cp_options *x)
   x->hard_link = false;
   x->interactive = I_UNSPECIFIED;
   x->move_mode = true;
+  x->install_mode = false;
   x->one_file_system = false;
   x->preserve_ownership = true;
   x->preserve_links = true;