commit fb95fd0c68eb260b671839f74235d03b252b19d7
Author: Maciek "mab122" Bator <maciek+git@mbator.pl>
Date:   Tue Jul 14 12:29:36 2026 +0200

    Initial commit: rad-lfs-transfer, a Git LFS custom transfer agent backed by IPFS
    
    Implements the Git LFS custom-transfer-agent protocol (init/upload/download/
    terminate over stdin/stdout JSON), storing large file content in a local
    IPFS (Kubo) daemon rather than a central server. The oid to CID mapping is
    carried in git notes on refs/notes/rad-lfs, keyed by each LFS pointer's own
    git blob hash, so it replicates with the repository via normal git sync.
    
    Companion to the rad lfs init / seed / unseed support in the paired
    heartwood fork.

diff --git a/.gitignore b/.gitignore
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+checksum = "625dc425cab0dca6dc3c3319506e6593dcb08a9f387ea3b284dbd52a92c40555"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "29666d0abbfad1e3dc4dcf6144730dd3a3ab225bbbdac83319345b1b44ccfc1b"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..68f3f86
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "radicle-lfs-transfer"
+version = "0.1.0"
+edition = "2024"
+description = "Git LFS custom transfer agent backing large files with IPFS, for Radicle"
+license = "MIT OR Apache-2.0"
+
+[[bin]]
+name = "rad-lfs-transfer"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1.0.103"
+reqwest = { version = "0.13.4", features = ["multipart", "stream", "json", "query"] }
+serde = { version = "1.0.228", features = ["derive"] }
+serde_json = "1.0.150"
+tokio = { version = "1.52.3", features = ["full"] }
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..1b5ec8b
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,176 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
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+   "You" (or "Your") shall mean an individual or Legal Entity
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+   "Work" shall mean the work of authorship, whether in Source or
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+   You may add Your own copyright statement to Your modifications and
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+   for use, reproduction, or distribution of Your modifications, or
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+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
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+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
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+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
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+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
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+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
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+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..23ceaac
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 the radicle-lfs-transfer contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..06298a5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,63 @@
+# radicle-lfs-transfer
+
+A [Git LFS custom transfer agent][custom-transfer] that backs large file storage with
+[IPFS](https://ipfs.tech), for use with [Radicle](https://radicle.xyz) repositories.
+
+This is the companion binary for the `rad lfs` support added to a
+[fork of `heartwood`](../radicle-heartwood-lfs) (Radicle's core node/CLI). It is not meant to
+be invoked directly — `git lfs` spawns it automatically once a repository has been set up with
+`rad lfs init`.
+
+[custom-transfer]: https://github.com/git-lfs/git-lfs/blob/main/docs/custom-transfers.md
+
+## How it works
+
+Instead of a shared, seed-hosted LFS server, every peer uses their own local IPFS node:
+
+- On `git add`/`git commit`, a pre-commit hook (installed by `rad lfs init`) adds each staged
+  LFS-tracked file to your local IPFS daemon, pins it, and records the resulting CID as a git
+  note (`refs/notes/rad-lfs`) attached to the LFS pointer file's own git blob hash. That notes
+  ref travels with the repository via Radicle's normal replication, alongside everything else.
+- `rad-lfs-transfer` implements the other half: when `git lfs push`/`pull` runs, it's invoked
+  per-object over stdin/stdout JSON (the standard Git LFS custom-transfer-agent protocol) and:
+  - **upload**: confirms the object is already pinned in IPFS (it should be, from the
+    pre-commit hook) or adds it if the hook was bypassed.
+  - **download**: reconstructs the expected pointer blob hash from the requested oid/size,
+    looks up its `cid=` note, and fetches the content from your local IPFS daemon (which will
+    pull it from the wider IPFS network if it isn't local yet).
+
+There is no central server anywhere in this design — see the companion `heartwood` fork's
+documentation for the full rationale and how `rad seed`/`rad unseed` tie IPFS pinning to
+Radicle's existing seeding lifecycle.
+
+## Requirements
+
+- Only needed **at runtime**, not to build or install this binary: a local IPFS (Kubo) daemon
+  reachable at `http://127.0.0.1:5001` (or wherever `KUBO_API_URL` points). If it's not
+  running when `git lfs push`/`pull` tries to use it, you'll get a clear error telling you to
+  start one (`ipfs daemon`) — nothing fails silently, and nothing about building or installing
+  this binary requires IPFS to be present at all.
+- [Git LFS](https://git-lfs.com) installed (`git-lfs` on your `PATH`).
+
+## Build & install
+
+```sh
+cargo install --path .
+```
+
+This installs the `rad-lfs-transfer` binary to `~/.cargo/bin` (make sure that's on your
+`PATH` — it's needed there so `git lfs` can find it once `rad lfs init` configures it).
+
+## Configuration
+
+| Environment variable | Default                   | Purpose                                  |
+|-----------------------|----------------------------|-------------------------------------------|
+| `KUBO_API_URL`         | `http://127.0.0.1:5001`   | Base URL of your local Kubo HTTP RPC API |
+
+You normally don't need to set this yourself — `rad lfs init` wires up everything else
+(the transfer-agent config, the pre-commit hook, and the notes-ref refspecs) automatically.
+
+## License
+
+Licensed under either of [Apache License, Version 2.0](LICENSE-APACHE) or
+[MIT license](LICENSE-MIT) at your option.
diff --git a/src/kubo.rs b/src/kubo.rs
new file mode 100644
index 0000000..47051f6
--- /dev/null
+++ b/src/kubo.rs
@@ -0,0 +1,103 @@
+use anyhow::{Context, bail};
+use serde::Deserialize;
+
+#[derive(Clone)]
+pub struct Kubo {
+    client: reqwest::Client,
+    api_url: String,
+}
+
+#[derive(Deserialize)]
+struct AddResponse {
+    #[serde(rename = "Hash")]
+    hash: String,
+}
+
+impl Kubo {
+    pub fn new(api_url: String) -> Self {
+        Self {
+            client: reqwest::Client::new(),
+            api_url,
+        }
+    }
+
+    /// Adds bytes to IPFS using Kubo's normal chunked UnixFS add (default
+    /// params — no raw-leaves / single-block tricks) and returns the CID.
+    pub async fn add(&self, bytes: Vec<u8>) -> anyhow::Result<String> {
+        let part = reqwest::multipart::Part::bytes(bytes).file_name("blob");
+        let form = reqwest::multipart::Form::new().part("file", part);
+
+        let resp = self
+            .client
+            .post(format!("{}/api/v0/add", self.api_url))
+            .multipart(form)
+            .send()
+            .await
+            .context("failed to reach Kubo daemon for /api/v0/add")?;
+
+        if !resp.status().is_success() {
+            bail!("kubo add failed: HTTP {}", resp.status());
+        }
+
+        let body = resp.text().await?;
+        let line = body
+            .lines()
+            .find(|l| !l.trim().is_empty())
+            .context("empty response from kubo add")?;
+        let parsed: AddResponse = serde_json::from_str(line)
+            .with_context(|| format!("failed to parse kubo add response: {line}"))?;
+        Ok(parsed.hash)
+    }
+
+    /// Explicitly (recursively) pins a CID, decoupled from add-time pinning.
+    pub async fn pin_add(&self, cid: &str) -> anyhow::Result<()> {
+        let resp = self
+            .client
+            .post(format!("{}/api/v0/pin/add", self.api_url))
+            .query(&[("arg", cid), ("recursive", "true")])
+            .send()
+            .await
+            .context("failed to reach Kubo daemon for /api/v0/pin/add")?;
+
+        if !resp.status().is_success() {
+            bail!("kubo pin/add failed for {cid}: HTTP {}", resp.status());
+        }
+        Ok(())
+    }
+
+    /// Streams the full reassembled file content for a CID via /api/v0/cat.
+    pub async fn cat(&self, cid: &str) -> anyhow::Result<reqwest::Response> {
+        let resp = self
+            .client
+            .post(format!("{}/api/v0/cat", self.api_url))
+            .query(&[("arg", cid)])
+            .send()
+            .await
+            .context("failed to reach Kubo daemon for /api/v0/cat")?;
+
+        if !resp.status().is_success() {
+            bail!("kubo cat failed for {cid}: HTTP {}", resp.status());
+        }
+        Ok(resp)
+    }
+
+    /// Verifies the local Kubo daemon is actually reachable, for a clear
+    /// upfront error instead of a confusing failure mid-transfer.
+    pub async fn healthcheck(&self) -> anyhow::Result<()> {
+        let resp = self
+            .client
+            .post(format!("{}/api/v0/id", self.api_url))
+            .send()
+            .await
+            .with_context(|| {
+                format!(
+                    "no IPFS (Kubo) daemon reachable at {} — start one with `ipfs daemon`",
+                    self.api_url
+                )
+            })?;
+        if !resp.status().is_success() {
+            bail!("kubo daemon at {} returned HTTP {}", self.api_url, resp.status());
+        }
+        Ok(())
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b8d443d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,173 @@
+mod kubo;
+mod notes;
+
+use serde_json::{Value, json};
+use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
+
+use kubo::Kubo;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    let kubo = Kubo::new(
+        std::env::var("KUBO_API_URL").unwrap_or_else(|_| "http://127.0.0.1:5001".to_string()),
+    );
+
+    let stdin = tokio::io::stdin();
+    let mut lines = BufReader::new(stdin).lines();
+    let mut stdout = tokio::io::stdout();
+
+    while let Some(line) = lines.next_line().await? {
+        if line.trim().is_empty() {
+            continue;
+        }
+        let msg: Value = serde_json::from_str(&line)?;
+        let event = msg.get("event").and_then(Value::as_str).unwrap_or("");
+
+        match event {
+            "init" => {
+                let resp = match kubo.healthcheck().await {
+                    Ok(()) => json!({}),
+                    Err(e) => json!({"error": {"code": 1, "message": format!("{e:#}")}}),
+                };
+                write_line(&mut stdout, &resp).await?;
+            }
+            "upload" => {
+                let resp = handle_upload(&kubo, &msg).await;
+                write_line(&mut stdout, &resp).await?;
+            }
+            "download" => {
+                let resp = handle_download(&kubo, &msg).await;
+                write_line(&mut stdout, &resp).await?;
+            }
+            "terminate" => break,
+            other => {
+                write_line(
+                    &mut stdout,
+                    &json!({"error": {"code": 2, "message": format!("unknown event: {other}")}}),
+                )
+                .await?;
+            }
+        }
+    }
+
+    Ok(())
+}
+
+async fn handle_upload(kubo: &Kubo, msg: &Value) -> Value {
+    match upload_inner(kubo, msg).await {
+        Ok(oid) => json!({"event": "complete", "oid": oid}),
+        Err((oid, e)) => json!({
+            "event": "complete",
+            "oid": oid,
+            "error": {"code": 3, "message": format!("{e:#}")},
+        }),
+    }
+}
+
+async fn upload_inner(kubo: &Kubo, msg: &Value) -> Result<String, (String, anyhow::Error)> {
+    let oid = field_str(msg, "oid").map_err(|e| (String::new(), e))?;
+    let size = field_i64(msg, "size").map_err(|e| (oid.clone(), e))?;
+    let path = field_str(msg, "path").map_err(|e| (oid.clone(), e))?;
+
+    let blob_sha = notes::pointer_blob_hash(&oid, size)
+        .await
+        .map_err(|e| (oid.clone(), e))?;
+
+    // The pre-commit hook should already have added+pinned this and written
+    // the note. If it did, just confirm the pin (idempotent). If not (e.g.
+    // the hook was bypassed with `--no-verify`), self-heal by adding it now.
+    match notes::read_cid(&blob_sha).await {
+        Ok(Some(cid)) => {
+            kubo.pin_add(&cid).await.map_err(|e| (oid.clone(), e))?;
+        }
+        Ok(None) | Err(_) => {
+            let bytes = tokio::fs::read(&path).await.map_err(|e| {
+                (
+                    oid.clone(),
+                    anyhow::Error::from(e).context(format!("failed to read {path}")),
+                )
+            })?;
+            let cid = kubo.add(bytes).await.map_err(|e| (oid.clone(), e))?;
+            kubo.pin_add(&cid).await.map_err(|e| (oid.clone(), e))?;
+            notes::write_cid(&blob_sha, &cid)
+                .await
+                .map_err(|e| (oid.clone(), e))?;
+        }
+    }
+
+    Ok(oid)
+}
+
+async fn handle_download(kubo: &Kubo, msg: &Value) -> Value {
+    match download_inner(kubo, msg).await {
+        Ok((oid, path)) => json!({"event": "complete", "oid": oid, "path": path}),
+        Err((oid, e)) => json!({
+            "event": "complete",
+            "oid": oid,
+            "error": {"code": 3, "message": format!("{e:#}")},
+        }),
+    }
+}
+
+async fn download_inner(kubo: &Kubo, msg: &Value) -> Result<(String, String), (String, anyhow::Error)> {
+    let oid = field_str(msg, "oid").map_err(|e| (String::new(), e))?;
+    let size = field_i64(msg, "size").map_err(|e| (oid.clone(), e))?;
+
+    let blob_sha = notes::pointer_blob_hash(&oid, size)
+        .await
+        .map_err(|e| (oid.clone(), e))?;
+
+    let cid = notes::read_cid(&blob_sha)
+        .await
+        .map_err(|e| (oid.clone(), e))?
+        .ok_or_else(|| {
+            (
+                oid.clone(),
+                anyhow::anyhow!(
+                    "no CID recorded for oid {oid} (no rad-lfs note on pointer blob {blob_sha}); \
+                     the peer that has this object needs to push its refs/notes/rad-lfs ref"
+                ),
+            )
+        })?;
+
+    let mut resp = kubo.cat(&cid).await.map_err(|e| (oid.clone(), e))?;
+
+    let tmp_path = std::env::temp_dir().join(format!("rad-lfs-{oid}"));
+    let mut file = tokio::fs::File::create(&tmp_path)
+        .await
+        .map_err(|e| (oid.clone(), anyhow::Error::from(e)))?;
+
+    while let Some(chunk) = resp
+        .chunk()
+        .await
+        .map_err(|e| (oid.clone(), anyhow::Error::from(e)))?
+    {
+        file.write_all(&chunk)
+            .await
+            .map_err(|e| (oid.clone(), anyhow::Error::from(e)))?;
+    }
+    file.flush().await.map_err(|e| (oid.clone(), anyhow::Error::from(e)))?;
+
+    Ok((oid, tmp_path.to_string_lossy().to_string()))
+}
+
+fn field_str(msg: &Value, key: &str) -> anyhow::Result<String> {
+    msg.get(key)
+        .and_then(Value::as_str)
+        .map(String::from)
+        .ok_or_else(|| anyhow::anyhow!("missing/invalid field: {key}"))
+}
+
+fn field_i64(msg: &Value, key: &str) -> anyhow::Result<i64> {
+    msg.get(key)
+        .and_then(Value::as_i64)
+        .ok_or_else(|| anyhow::anyhow!("missing/invalid field: {key}"))
+}
+
+async fn write_line(stdout: &mut tokio::io::Stdout, value: &Value) -> anyhow::Result<()> {
+    let mut s = serde_json::to_string(value)?;
+    s.push('\n');
+    stdout.write_all(s.as_bytes()).await?;
+    stdout.flush().await?;
+    Ok(())
+}
diff --git a/src/notes.rs b/src/notes.rs
new file mode 100644
index 0000000..0db4250
--- /dev/null
+++ b/src/notes.rs
@@ -0,0 +1,89 @@
+use anyhow::{Context, bail};
+use tokio::process::Command;
+
+pub const NOTES_REF: &str = "refs/notes/rad-lfs";
+
+/// Computes the git blob hash for the standard 3-line LFS pointer text for a
+/// given oid/size, without needing the file itself or a repo search — the
+/// pointer format is fully deterministic. Shells out to `git hash-object`
+/// rather than hand-rolling the hash so this automatically respects the
+/// repo's actual object format (SHA-1 vs SHA-256).
+pub async fn pointer_blob_hash(oid: &str, size: i64) -> anyhow::Result<String> {
+    let pointer = pointer_text(oid, size);
+
+    let mut child = Command::new("git")
+        .args(["hash-object", "--stdin", "-t", "blob"])
+        .stdin(std::process::Stdio::piped())
+        .stdout(std::process::Stdio::piped())
+        .stderr(std::process::Stdio::piped())
+        .spawn()
+        .context("failed to spawn `git hash-object`")?;
+
+    {
+        use tokio::io::AsyncWriteExt;
+        let stdin = child.stdin.as_mut().context("no stdin for git hash-object")?;
+        stdin.write_all(pointer.as_bytes()).await?;
+    }
+
+    let output = child.wait_with_output().await?;
+    if !output.status.success() {
+        bail!(
+            "git hash-object failed: {}",
+            String::from_utf8_lossy(&output.stderr)
+        );
+    }
+    Ok(String::from_utf8(output.stdout)?.trim().to_string())
+}
+
+pub fn pointer_text(oid: &str, size: i64) -> String {
+    format!("version https://git-lfs.github.com/spec/v1\noid sha256:{oid}\nsize {size}\n")
+}
+
+/// Reads the `cid=<cid>` note attached to a blob, if any.
+pub async fn read_cid(blob_sha: &str) -> anyhow::Result<Option<String>> {
+    let output = Command::new("git")
+        .args(["notes", "--ref", NOTES_REF, "show", blob_sha])
+        .output()
+        .await
+        .context("failed to spawn `git notes show`")?;
+
+    if !output.status.success() {
+        // Non-zero exit typically means no note exists for this object.
+        return Ok(None);
+    }
+
+    let text = String::from_utf8(output.stdout)?;
+    Ok(parse_cid(&text))
+}
+
+/// Writes/overwrites the `cid=<cid>` note on a blob.
+pub async fn write_cid(blob_sha: &str, cid: &str) -> anyhow::Result<()> {
+    let output = Command::new("git")
+        .args([
+            "notes",
+            "--ref",
+            NOTES_REF,
+            "add",
+            "-f",
+            "-m",
+            &format!("cid={cid}"),
+            blob_sha,
+        ])
+        .output()
+        .await
+        .context("failed to spawn `git notes add`")?;
+
+    if !output.status.success() {
+        bail!(
+            "git notes add failed: {}",
+            String::from_utf8_lossy(&output.stderr)
+        );
+    }
+    Ok(())
+}
+
+fn parse_cid(note: &str) -> Option<String> {
+    note.lines()
+        .find_map(|line| line.strip_prefix("cid="))
+        .map(|s| s.trim().to_string())
+}