Ceph

Just a note that you can set the id via the argument to libcephfs's ceph_create()...

Looking a bit further I don't think any other early arguments apply... -i is the only useful one, and that is passed in explicitly to ceph_create().

(Otherwise, a patch like this would fix it:

diff --git a/src/libcephfs.cc b/src/libcephfs.cc
index 261ee695499..d1c0130ea22 100644
--- a/src/libcephfs.cc
+++ b/src/libcephfs.cc
@@ -412,7 +412,16 @@ extern "C" int ceph_create_from_rados(struct ceph_mount_info **cmount,

 extern "C" int ceph_create(struct ceph_mount_info **cmount, const char * const id)
 {
-  CephInitParameters iparams(CEPH_ENTITY_TYPE_CLIENT);
+  std::string cluster, conf_file_list;  // note: these are ignored
+  std::vector<const char*> env_args;
+  if (getenv("CEPH_ARGS")) {
+    env_to_vec(env_args, "CEPH_ARGS");
+  }
+  CephInitParameters iparams = ceph_argparse_early_args(
+    args,
+    CEPH_ENTITY_TYPE_CLIENT,
+    &cluster,
+    &conf_file_list);
   if (id) {
     iparams.name.set(CEPH_ENTITY_TYPE_CLIENT, id);
   }

Sage Weil wrote:

Just a note that you can set the id via the argument to libcephfs's ceph_create()...

This is for libcephsqlite not libcephfs. libcephsqlite may be loaded as an extension: https://sqlite.org/loadext.html

In that situation, it creates its own CephContext as a library: https://github.com/ceph/ceph/pull/39191/files#diff-ded8375ff66b37ff397079257b05404cba3936aac2f67dad1f98134d07a7f17bR119-R140

But it does not have access to argv. So the only way to set an --id is via $CEPH_ARGS (AFAIK).