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provenance: convert from enum to freeform string

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The Provenance enum couldn't represent agents defined outside the
source code. Replace it with a Text field in the capnp schema so any
agent can write its own provenance label (e.g. "extractor:write",
"rename:tombstone") without a code change.

Schema: rename old enum fields to provenanceOld, add new Text
provenance fields. Old enum kept for reading legacy records.
Migration: from_capnp_migrate() falls back to old enum when the
new text field is empty.

Also adds `poc-memory tail` command for viewing recent store writes.

Co-Authored-By: ProofOfConcept <poc@bcachefs.org>
This commit is contained in:
Kent Overstreet 2026-03-11 01:19:52 -04:00
parent de204e3075
commit d76b14dfcd
14 changed files with 160 additions and 67 deletions
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8
poc-memory/src/store/persist.rs
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@ -117,7 +117,7 @@ impl Store {
.map_err(|e| format!("read node log: {}", e))?;
for node_reader in log.get_nodes()
.map_err(|e| format!("get nodes: {}", e))? {
let node = Node::from_capnp(node_reader)?;
let node = Node::from_capnp_migrate(node_reader)?;
let existing_version = self.nodes.get(&node.key)
.map(|n| n.version)
.unwrap_or(0);
@ -164,7 +164,7 @@ impl Store {
.map_err(|e| format!("read relation log: {}", e))?;
for rel_reader in log.get_relations()
.map_err(|e| format!("get relations: {}", e))? {
let rel = Relation::from_capnp(rel_reader)?;
let rel = Relation::from_capnp_migrate(rel_reader)?;
let existing_version = by_uuid.get(&rel.uuid)
.map(|r| r.version)
.unwrap_or(0);
@ -199,7 +199,7 @@ impl Store {
.map_err(|e| format!("read node log: {}", e))?;
for node_reader in log.get_nodes()
.map_err(|e| format!("get nodes: {}", e))? {
let node = Node::from_capnp(node_reader)?;
let node = Node::from_capnp_migrate(node_reader)?;
let dominated = by_uuid.get(&node.uuid)
.map(|n| node.version >= n.version)
.unwrap_or(true);
@ -276,7 +276,7 @@ impl Store {
.map_err(|e| format!("read node log delta: {}", e))?;
for node_reader in log.get_nodes()
.map_err(|e| format!("get nodes delta: {}", e))? {
let node = Node::from_capnp(node_reader)?;
let node = Node::from_capnp_migrate(node_reader)?;
let dominated = self.nodes.get(&node.key)
.map(|n| node.version >= n.version)
.unwrap_or(true);