copy_file: handle "cp /dev/foo file" (almost) compatibly to coreutils.

(almost because we do not copy mode, which is probably wasn't intended).
+61 bytes.

1 files changed, 5 insertions, 1 deletions

diff --git a/coreutils/mv.c b/coreutils/mv.c
index 5d02196e3..613d4ac46 100644
--- a/coreutils/mv.c
+++ b/coreutils/mv.c
@@ -71,7 +71,8 @@ int mv_main(int argc, char **argv)
                 }
 
  DO_MOVE:
-                if (dest_exists && !(flags & OPT_FILEUTILS_FORCE)
+                if (dest_exists
+                 && !(flags & OPT_FILEUTILS_FORCE)
                  && ((access(dest, W_OK) < 0 && isatty(0))
                     || (flags & OPT_FILEUTILS_INTERACTIVE))
                 ) {
@@ -108,6 +109,9 @@ int mv_main(int argc, char **argv)
                                                 goto RET_1;
                                         }
                                 }
+                                /* FILEUTILS_RECUR also prevents nasties like 
+                                 * "read from device and write contents to dst"
+                                 * instead of "create same device node" */
                                 copy_flag = FILEUTILS_RECUR | FILEUTILS_PRESERVE_STATUS;
 #if ENABLE_SELINUX
                                 copy_flag |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;