Supply real volume data to propolis

Instance creation now can specify that existing disks be attached to
the instance (disk creation during instance creation is not yet
implemented).

There's a few important changes here.

Nexus will instruct the sled agent to send volume construction requests
when it ensures the instance, and therefore has to build these requests.
This is done in sdc_regions_ensure as regions are allocated.

sic_create_instance_record no longer returns the runtime of an instance,
but the instance's name.

Importantly, the instance creation saga now calls Nexus'
instance_set_runtime instead of duplicating the logic to call
instance_put. Nexus' instance_set_runtime will populate the
InstanceHardware with NICs and disks.

Nexus' disk_set_runtime now *optionally* calls the sled agent's
disk_put if the instance is running already, otherwise the disk will be
attached as part of the instance ensure by specifying volume requests.

request_body_max_bytes had to be increased to 1M because the volume
requests could be arbitrarily large (and eventually, the cloud init
bytes will add to the body size too).

common/src/api/external/error.rs

@@ -296,6 +296,12 @@ impl<T: ClientError> From<progenitor::progenitor_client::Error<T>> for Error {
     }
 }
 
+impl From<serde_json::Error> for Error {
+    fn from(e: serde_json::Error) -> Self {
+        Error::internal_error(&e.to_string())
+    }
+}
+
 /// Like [`assert!`], except that instead of panicking, this function returns an
 /// `Err(Error::InternalError)` with an appropriate message if the given
 /// condition is not true.

common/src/api/external/mod.rs

@@ -467,6 +467,10 @@ impl Generation {
         assert!(next_gen <= u64::try_from(i64::MAX).unwrap());
         Generation(next_gen)
     }
+
+    pub fn get(&self) -> u64 {
+        self.0
+    }
 }
 
 impl Display for Generation {

nexus/Cargo.toml

@@ -11,9 +11,10 @@ path = "../rpaths"
 anyhow = "1.0"
 async-bb8-diesel = { git = "https://github.com/oxidecomputer/async-bb8-diesel", rev = "c849b717be" }
 async-trait = "0.1.51"
+base64 = "0.13.0"
 bb8 = "0.7.1"
 cookie = "0.16"
-crucible-agent-client = { git = "https://github.com/oxidecomputer/crucible", rev = "3e7e49eeb88fa8ad74375b0642aabd4224b1f2cb" }
+crucible-agent-client = { git = "https://github.com/oxidecomputer/crucible", rev = "32e603bdc3b6e5eb6b880a2ddde7e05f043b5357" }
 # Tracking pending 2.0 version.
 diesel = { git = "https://github.com/diesel-rs/diesel", rev = "ce77c382", features = ["postgres", "r2d2", "chrono", "serde_json", "network-address", "uuid"] }
 futures = "0.3.21"