From 4f650ddd5703a3665b95dc1b66de99dcd57a8b53 Mon Sep 17 00:00:00 2001
From: RelaxJonh <92573950+RelaxJonh@users.noreply.github.com>
Date: Thu, 6 Aug 2026 13:53:07 +0700
Subject: [PATCH] fix(update): preserve --depth 1 on shallow installs during
 update
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The `--check` path correctly detects shallow repos and appends
`--depth 1` to fetch commands (line 2238-2247), but the actual
update path at line 3749 did a bare `git fetch origin branch`
without depth args. On shallow installs (the default from the
installer), this unshallows the repo and drags in the entire git
history — causing `hermes update` to hang for 20+ minutes on slow
networks while downloading 179K+ objects.

Add the same shallow detection before the update fetch so that
`--depth 1` is preserved when the repo is shallow.

Fixes #80049
---
 hermes_cli/update_cmd.py | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/hermes_cli/update_cmd.py b/hermes_cli/update_cmd.py
index c99d56a81e18b..148bdba7b4f04 100644
--- a/hermes_cli/update_cmd.py
+++ b/hermes_cli/update_cmd.py
@@ -3744,9 +3744,22 @@ def _cmd_update_impl(args, gateway_mode: bool):
         # against.
         branch = _m()._resolve_update_branch(args)
 
+        # Detect shallow repo — a plain `git fetch` would unshallow it,
+        # dragging in the entire history (the exact cost `--depth 1` avoided).
+        is_shallow = (
+            subprocess.run(
+                git_cmd + ["rev-parse", "--is-shallow-repository"],
+                cwd=_m().PROJECT_ROOT,
+                capture_output=True,
+                text=True, encoding="utf-8", errors="replace",
+            ).stdout.strip()
+            == "true"
+        )
+        depth_args = ["--depth", "1"] if is_shallow else []
+
         print("→ Fetching updates...")
         fetch_result = subprocess.run(
-            git_cmd + ["fetch", "origin", branch],
+            git_cmd + ["fetch"] + depth_args + ["origin", branch],
             cwd=_m().PROJECT_ROOT,
             capture_output=True,
             text=True, encoding="utf-8", errors="replace",