[Libguestfs] [PATCH RFC supermin] ext2_initrd: error out if we can't add anything

From: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; If we failed to add something to initrd, just error out. Signed-off-by: Chen Hanxiao <chenhanxiao(a)gmail.com&gt; --- src/ext2_initrd.ml | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/src/ext2_initrd.ml b/src/ext2_initrd.ml index d4a4e2f..d9a3a99 100644 --- a/src/ext2_initrd.ml +++ b/src/ext2_initrd.ml @@ -151,8 +151,12 @@ let rec build_initrd debug tmpdir modpath initrd = visit topset; close_out chan; + let num_visted = StringSet.cardinal !visited in if debug >= 1 then - printf "supermin: ext2: wrote %d modules to minimal initrd\n%!" (StringSet.cardinal !visited); + printf "supermin: ext2: wrote %d modules to minimal initrd\n%!" num_visted; + + if num_visited == 0 then + error "failed to write any modules into minimal initrd, try 'depmod -a'" (* This is the binary blob containing the init "script". *) let init = binary_init () in -- 1.8.3.1