radicle: use `git push` to avoid `libgit2` push

In issue #[2836] of `libgit2`, the speed of `libgit2`'s `file://` protocol for
git operations is found to be very slow. This is further corrobarated by `rad
init` taking 13 hours to initialise the hardenedbsd [ports] repository.

There are two areas where the `heartwood` project uses `libgit2` to push using
the file protocol. The first is when via the `trasnport::local` smart transport
registration and the second is the final push to storage in the `git-remote-rad`
binary.

When both these `push` operations are changed to use the `git` binary instead,
the [ports] repository can be initialised in less than 10 minutes (nearly 100x
speed up).

This change is clearly required if `heartwood` wishes to support larger
repositories.

[2836]: https://github.com/libgit2/libgit2/issues/2836
[ports]: https://git.hardenedbsd.org/hardenedbsd/ports

radicle-remote-helper/src/push.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::too_many_arguments)]
 use std::collections::HashMap;
 use std::io::IsTerminal;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::str::FromStr;
 use std::{assert_eq, io};
 
@@ -30,6 +30,10 @@ use crate::{hint, read_line, warn, Options};
 
 #[derive(Debug, Error)]
 pub enum Error {
+    #[error(
+        "the Git repository found at {path:?} is a bare repository, expected a working directory"
+    )]
+    BareRepository { path: PathBuf },
     /// Public key doesn't match the remote namespace we're pushing to.
     #[error("cannot push to remote namespace owned by {0}")]
     KeyMismatch(Did),
@@ -777,12 +781,32 @@ fn push_ref(
     working: &git::raw::Repository,
     stored: &git::raw::Repository,
 ) -> Result<(), Error> {
-    let mut remote = working.remote_anonymous(&git::url::File::new(stored.path()).to_string())?;
-    let refspec = git::Refspec { src, dst, force };
-
+    let url = git::url::File::new(stored.path()).to_string();
     // Nb. The *force* indicator (`+`) is processed by Git tooling before we even reach this code.
     // This happens during the `list for-push` phase.
-    remote.push(&[refspec.to_string().as_str()], None)?;
+    let refspec = git::Refspec { src, dst, force };
+    let repo = working.workdir().ok_or(Error::BareRepository {
+        path: working.path().to_path_buf(),
+    })?;
+
+    radicle::git::run::<_, _, &str, &str>(
+        repo,
+        [
+            "push",
+            url.to_string().as_str(),
+            refspec.to_string().as_str(),
+        ],
+        [],
+    )
+    .map_err(|err| {
+        Error::Io(std::io::Error::new(
+            std::io::ErrorKind::Other,
+            format!(
+                "failed to run `git push {url} {refspec}` in {:?}: {err}",
+                working.path()
+            ),
+        ))
+    })?;
 
     Ok(())
 }

radicle/src/rad.rs

@@ -1,6 +1,6 @@
 #![allow(clippy::let_unit_value)]
 use std::io;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::str::FromStr;
 
 use once_cell::sync::Lazy;
@@ -29,6 +29,10 @@ pub static PATCHES_REFNAME: Lazy<git::RefString> = Lazy::new(|| git::refname!("r
 
 #[derive(Error, Debug)]
 pub enum InitError {
+    #[error(
+        "the Git repository found at {path:?} is a bare repository, expected a working directory"
+    )]
+    BareRepository { path: PathBuf },
     #[error("doc: {0}")]
     Doc(#[from] DocError),
     #[error("repository: {0}")]
@@ -103,13 +107,36 @@ where
 
     git::configure_repository(repo)?;
     git::configure_remote(repo, &REMOTE_NAME, url, &url.clone().with_namespace(*pk))?;
-    git::push(
-        repo,
-        &REMOTE_NAME,
-        [(
-            &git::fmt::lit::refs_heads(default_branch).into(),
-            &git::fmt::lit::refs_heads(default_branch).into(),
-        )],
+    let branch = git::Qualified::from(git::fmt::lit::refs_heads(default_branch));
+    // Pushes to default branch to the namespace of the `signer`
+    let pushspec = git::Refspec {
+        src: branch.clone(),
+        dst: branch.with_namespace(git::Component::from(pk)),
+        force: false,
+    };
+    git::run::<_, _, &str, &str>(
+        repo.workdir().ok_or(InitError::BareRepository {
+            path: repo.path().to_path_buf(),
+        })?,
+        [
+            "push",
+            &format!("{}", stored.path().canonicalize()?.display()),
+            &pushspec.to_string(),
+        ],
+        [],
+    )?;
+    // N.b. we need to create the remote branch for the default branch
+    let rad_remote =
+        git::Qualified::from(git::lit::refs_remotes(&*REMOTE_COMPONENT)).join(default_branch);
+    let oid = repo.refname_to_id(branch.as_str())?;
+    repo.reference(
+        rad_remote.as_str(),
+        oid,
+        false,
+        &format!(
+            "radicle: remote branch {}/{}",
+            *REMOTE_COMPONENT, default_branch
+        ),
     )?;
     stored.set_remote_identity_root_to(pk, identity)?;
     stored.set_identity_head_to(identity)?;