cryptsetup: don't add unit dependency on /dev/null devices when it is listed as passw...

As special magic, don't create device dependencies for /dev/null. Of
course, there might be similar devices we might want to include, but
given that none of them really make sense to specify as password source
there's really no point in checking for anything else here.

https://bugs.freedesktop.org/show_bug.cgi?id=75816

diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 9530e44..da16324 100644 (file)
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -29,6 +29,7 @@
 #include "mkdir.h"
 #include "strv.h"
 #include "fileio.h"
+#include "path-util.h"
 
 static const char *arg_dest = "/tmp";
 static bool arg_enabled = true;
@@ -144,16 +145,19 @@ static int create_disk(
                         if (!uu)
                                 return log_oom();
 
-                        if (is_device_path(uu)) {
-                                _cleanup_free_ char *dd;
+                        if (!path_equal(uu, "/dev/null")) {
 
-                                dd = unit_name_from_path(uu, ".device");
-                                if (!dd)
-                                        return log_oom();
+                                if (is_device_path(uu)) {
+                                        _cleanup_free_ char *dd;
 
-                                fprintf(f, "After=%1$s\nRequires=%1$s\n", dd);
-                        } else
-                                fprintf(f, "RequiresMountsFor=%s\n", password);
+                                        dd = unit_name_from_path(uu, ".device");
+                                        if (!dd)
+                                                return log_oom();
+
+                                        fprintf(f, "After=%1$s\nRequires=%1$s\n", dd);
+                                } else
+                                        fprintf(f, "RequiresMountsFor=%s\n", password);
+                        }
                 }
         }