diff --git a/eden/scm/lib/edenapi/types/Cargo.toml b/eden/scm/lib/edenapi/types/Cargo.toml
index 4c1c014c61..22bdaeac51 100644
--- a/eden/scm/lib/edenapi/types/Cargo.toml
+++ b/eden/scm/lib/edenapi/types/Cargo.toml
@@ -10,6 +10,7 @@ default = ["for-tests"]
 for-tests = []
 
 [dependencies]
+dag = { path = "../../dag", features = ["for-tests"] }
 revisionstore_types = { path = "../../revisionstore/types" }
 types = { path = "../../types" }
 anyhow = "1.0"
diff --git a/eden/scm/lib/edenapi/types/src/lib.rs b/eden/scm/lib/edenapi/types/src/lib.rs
index fd426c6170..08076ed1d7 100644
--- a/eden/scm/lib/edenapi/types/src/lib.rs
+++ b/eden/scm/lib/edenapi/types/src/lib.rs
@@ -50,6 +50,9 @@ pub use crate::metadata::{
 pub use crate::tree::{TreeChildEntry, TreeEntry, TreeError, TreeRequest};
 pub use crate::wire::{ToApi, ToWire, WireToApiConversionError};
 
+// re-export CloneData
+pub use dag::{CloneData, FlatSegment, PreparedFlatSegments};
+
 #[cfg(any(test, feature = "for-tests"))]
 use quickcheck::Arbitrary;
 use thiserror::Error;
diff --git a/eden/scm/lib/edenapi/types/src/wire/clone.rs b/eden/scm/lib/edenapi/types/src/wire/clone.rs
new file mode 100644
index 0000000000..894ec0cc6d
--- /dev/null
+++ b/eden/scm/lib/edenapi/types/src/wire/clone.rs
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This software may be used and distributed according to the terms of the
+ * GNU General Public License version 2.
+ */
+
+use std::collections::HashMap;
+
+#[cfg(any(test, feature = "for-tests"))]
+use quickcheck::Arbitrary;
+use serde_derive::{Deserialize, Serialize};
+
+use types::HgId;
+
+use crate::wire::{ToApi, ToWire, WireDagId, WireHgId, WireToApiConversionError};
+use crate::{CloneData, FlatSegment, PreparedFlatSegments};
+
+// Only when an id has more than one parent it is sent over the wire.
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]
+pub struct WireCloneData {
+    #[serde(rename = "1")]
+    pub head_id: WireDagId,
+    #[serde(rename = "2")]
+    pub flat_segments: Vec<WireFlatSegment>,
+    #[serde(rename = "3")]
+    pub idmap: Vec<WireIdMapEntry>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]
+pub struct WireFlatSegment {
+    #[serde(rename = "1")]
+    pub low: WireDagId,
+    #[serde(rename = "2")]
+    pub high: WireDagId,
+    #[serde(rename = "3")]
+    pub parents: Vec<WireDagId>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]
+pub struct WireIdMapEntry {
+    #[serde(rename = "1")]
+    pub dag_id: WireDagId,
+    #[serde(rename = "2")]
+    pub hg_id: WireHgId,
+}
+
+impl ToWire for CloneData<HgId> {
+    type Wire = WireCloneData;
+
+    fn to_wire(self) -> Self::Wire {
+        let idmap = self
+            .idmap
+            .into_iter()
+            .map(|(k, v)| WireIdMapEntry {
+                dag_id: k.to_wire(),
+                hg_id: v.to_wire(),
+            })
+            .collect();
+        WireCloneData {
+            head_id: self.head_id.to_wire(),
+            flat_segments: self.flat_segments.segments.to_wire(),
+            idmap,
+        }
+    }
+}
+
+impl ToApi for WireCloneData {
+    type Api = CloneData<HgId>;
+    type Error = WireToApiConversionError;
+
+    fn to_api(self) -> Result<Self::Api, Self::Error> {
+        let mut idmap = HashMap::new();
+        for wie in self.idmap {
+            idmap.insert(wie.dag_id.to_api()?, wie.hg_id.to_api()?);
+        }
+        let flat_segments = PreparedFlatSegments {
+            segments: self.flat_segments.to_api()?,
+        };
+        Ok(CloneData {
+            head_id: self.head_id.to_api()?,
+            flat_segments,
+            idmap,
+        })
+    }
+}
+
+impl ToWire for FlatSegment {
+    type Wire = WireFlatSegment;
+
+    fn to_wire(self) -> Self::Wire {
+        WireFlatSegment {
+            low: self.low.to_wire(),
+            high: self.high.to_wire(),
+            parents: self.parents.to_wire(),
+        }
+    }
+}
+
+impl ToApi for WireFlatSegment {
+    type Api = FlatSegment;
+    type Error = WireToApiConversionError;
+
+    fn to_api(self) -> Result<Self::Api, Self::Error> {
+        Ok(FlatSegment {
+            low: self.low.to_api()?,
+            high: self.high.to_api()?,
+            parents: self.parents.to_api()?,
+        })
+    }
+}
+
+#[cfg(any(test, feature = "for-tests"))]
+impl Arbitrary for WireFlatSegment {
+    fn arbitrary<G: quickcheck::Gen>(g: &mut G) -> Self {
+        FlatSegment::arbitrary(g).to_wire()
+    }
+}
+
+#[cfg(any(test, feature = "for-tests"))]
+impl Arbitrary for WireCloneData {
+    fn arbitrary<G: quickcheck::Gen>(g: &mut G) -> Self {
+        CloneData::arbitrary(g).to_wire()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::wire::tests::{check_serialize_roundtrip, check_wire_roundtrip};
+
+    use quickcheck::quickcheck;
+
+    quickcheck! {
+        fn test_request_roundtrip_serialize(v: WireCloneData) -> bool {
+            check_serialize_roundtrip(v)
+        }
+
+        fn test_request_roundtrip_wire(v: CloneData<HgId>) -> bool {
+            check_wire_roundtrip(v)
+        }
+    }
+}
diff --git a/eden/scm/lib/edenapi/types/src/wire/mod.rs b/eden/scm/lib/edenapi/types/src/wire/mod.rs
index d02c34e344..53b5df644e 100644
--- a/eden/scm/lib/edenapi/types/src/wire/mod.rs
+++ b/eden/scm/lib/edenapi/types/src/wire/mod.rs
@@ -45,6 +45,7 @@
 //! 7. If the type has a corresponding API type, add a quickcheck wire-API round
 //! trip test.
 
+pub mod clone;
 pub mod complete_tree;
 pub mod file;
 pub mod history;
@@ -52,6 +53,7 @@ pub mod metadata;
 pub mod tree;
 
 pub use crate::wire::{
+    clone::{WireCloneData, WireIdMapEntry},
     complete_tree::WireCompleteTreeRequest,
     file::{WireFileEntry, WireFileRequest},
     history::{WireHistoryRequest, WireHistoryResponseChunk, WireWireHistoryEntry},
@@ -427,6 +429,26 @@ impl ToApi for u32 {
     }
 }
 
+#[derive(Clone, Copy, Default, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct WireDagId(u64);
+
+impl ToWire for dag::Id {
+    type Wire = WireDagId;
+
+    fn to_wire(self) -> Self::Wire {
+        WireDagId(self.0)
+    }
+}
+
+impl ToApi for WireDagId {
+    type Api = dag::Id;
+    type Error = Infallible;
+
+    fn to_api(self) -> Result<Self::Api, Self::Error> {
+        Ok(dag::Id(self.0))
+    }
+}
+
 fn is_default<T: Default + PartialEq>(v: &T) -> bool {
     v == &T::default()
 }
@@ -482,6 +504,13 @@ impl Arbitrary for WireRevisionstoreMetadata {
     }
 }
 
+#[cfg(any(test, feature = "for-tests"))]
+impl Arbitrary for WireDagId {
+    fn arbitrary<G: quickcheck::Gen>(g: &mut G) -> Self {
+        dag::Id::arbitrary(g).to_wire()
+    }
+}
+
 #[cfg(test)]
 pub mod tests {
     use super::*;
@@ -530,6 +559,10 @@ pub mod tests {
             check_serialize_roundtrip(v)
         }
 
+        fn test_dagid_roundtrip_serialize(v: WireDagId) -> bool {
+            check_serialize_roundtrip(v)
+        }
+
         // API-Wire roundtrips
         fn test_hgid_roundtrip_wire(v: HgId) -> bool {
             check_wire_roundtrip(v)
@@ -550,5 +583,9 @@ pub mod tests {
         fn test_meta_roundtrip_wire(v: RevisionstoreMetadata) -> bool {
             check_wire_roundtrip(v)
         }
+
+        fn test_dagid_roundtrip_wire(v: dag::Id) -> bool {
+            check_wire_roundtrip(v)
+        }
     }
 }
diff --git a/eden/scm/lib/hgcommits/Cargo.toml b/eden/scm/lib/hgcommits/Cargo.toml
index d76ff94e03..d412319a23 100644
--- a/eden/scm/lib/hgcommits/Cargo.toml
+++ b/eden/scm/lib/hgcommits/Cargo.toml
@@ -6,7 +6,7 @@ version = "0.1.0"
 include = ["src/**/*.rs"]
 
 [dependencies]
-dag = { path = "../dag" }
+dag = { path = "../dag", features = ["for-tests"] }
 edenapi = { path = "../edenapi" }
 gitdag = { path = "../dag/gitdag" }
 metalog = { path = "../metalog" }