improve snapshotting speed further

packages/opencode/.gitignore

@@ -1,4 +1,3 @@
-node_modules
 research
 dist
 gen

packages/opencode/src/snapshot/index.ts

@@ -1,14 +1,7 @@
 import { App } from "../app/app"
-import {
-  add,
-  commit,
-  init,
-  checkout,
-  statusMatrix,
-  remove,
-} from "isomorphic-git"
+import { $ } from "bun"
 import path from "path"
-import fs from "fs"
+import fs from "fs/promises"
 import { Ripgrep } from "../file/ripgrep"
 import { Log } from "../util/log"
 
@@ -19,76 +12,52 @@ export namespace Snapshot {
     log.info("creating snapshot")
     const app = App.info()
     const git = gitdir(sessionID)
-    const files = await Ripgrep.files({
-      cwd: app.path.cwd,
-      limit: app.git ? undefined : 1000,
-    })
-    log.info("found files", { count: files.length })
-    // not a git repo and too big to snapshot
-    if (!app.git && files.length === 1000) return
-    await init({
-      dir: app.path.cwd,
-      gitdir: git,
-      fs,
-    })
-    log.info("initialized")
-    const status = await statusMatrix({
-      fs,
-      gitdir: git,
-      dir: app.path.cwd,
-    })
-    log.info("matrix", {
-      count: status.length,
-    })
-    const added = []
-    for (const [file, head, workdir, stage] of status) {
-      if (workdir === 0 && stage === 1) {
-        log.info("remove", { file })
-        await remove({
-          fs,
-          gitdir: git,
-          dir: app.path.cwd,
-          filepath: file,
-        })
-        continue
-      }
-      if (workdir !== head) {
-        added.push(file)
-      }
+
+    // not a git repo, check if too big to snapshot
+    if (!app.git) {
+      const files = await Ripgrep.files({
+        cwd: app.path.cwd,
+        limit: 1000,
+      })
+      log.info("found files", { count: files.length })
+      if (files.length > 1000) return
     }
-    log.info("removed files")
-    await add({
-      fs,
-      gitdir: git,
-      parallel: true,
-      dir: app.path.cwd,
-      filepath: added,
-    })
+
+    if (await fs.mkdir(git, { recursive: true })) {
+      await $`git init`
+        .env({
+          ...process.env,
+          GIT_DIR: git,
+          GIT_WORK_TREE: app.path.root,
+        })
+        .quiet()
+        .nothrow()
+      log.info("initialized")
+    }
+
+    await $`git --git-dir ${git} add .`.quiet().cwd(app.path.cwd).nothrow()
     log.info("added files")
-    const result = await commit({
-      fs,
-      gitdir: git,
-      dir: app.path.cwd,
-      message: "snapshot",
-      author: {
-        name: "opencode",
-        email: "mail@opencode.ai",
-      },
-    })
-    log.info("commit", { result })
-    return result
+
+    const result =
+      await $`git --git-dir ${git} commit --allow-empty -m "snapshot" --author="opencode <mail@opencode.ai>"`
+        .quiet()
+        .cwd(app.path.cwd)
+        .nothrow()
+    log.info("commit")
+
+    // Extract commit hash from output like "[main abc1234] snapshot"
+    const match = result.stdout.toString().match(/\[.+ ([a-f0-9]+)\]/)
+    if (!match) throw new Error("Failed to extract commit hash")
+    return match[1]
   }
 
   export async function restore(sessionID: string, commit: string) {
     log.info("restore", { commit })
     const app = App.info()
-    await checkout({
-      fs,
-      gitdir: gitdir(sessionID),
-      dir: app.path.cwd,
-      ref: commit,
-      force: true,
-    })
+    const git = gitdir(sessionID)
+    await $`git --git-dir=${git} checkout ${commit} --force`
+      .quiet()
+      .cwd(app.path.root)
   }
 
   function gitdir(sessionID: string) {