ccon: Only create target files for non-dir bind mounts

For example, if you're mounting /dev/sda1 (a block device, so not a
directory), you'll still want a target directory.

Author: wking

README.md

@@ -352,9 +352,10 @@ interpreted as paths relative to ccon's [current working
 directory][getcwd.3].
 
 If **`target`** does not exist, ccon will attempt to create it by
-calling [`mkdir`][mkdir.3p], making multiple calls if necessary.  If
-**`source`** is set to a non-directory and **`target`** does not exit,
-ccon will create an empty file at **`target`** to mount over.
+calling [`mkdir`][mkdir.3p], making multiple calls if necessary.  For
+bind mounts where **`source`** is set to a non-directory and
+**`target`** does not exit, ccon will create an empty file at
+**`target`** to mount over.
 
 In addition to the usual types supported by [`mount`][mount.2], ccon
 supports a `pivot-root` **`type`** that invokes the

ccon.c

@@ -2386,7 +2386,9 @@ static int handle_mounts(json_t * config)
 					PERROR("stat");
 					return 1;
 				}
-				mkdir = S_ISDIR(buf.st_mode);
+				if (flags | MS_BIND && !S_ISDIR(buf.st_mode)) {
+					mkdir = 0;
+				}
 			}
 			if (mkdir) {
 				if (mkdir_all(target, 0777) == -1) {