[PATCH b4 4/6] fake-am: use the scratch-worktree overrides in the staging worktree

make_fake_am_range() has a throwaway worktree of its own. It stages the
blobs the series expects to find, commits that tree, resets onto it and
ams the patches on top to get a commit range b4 can diff against. b4
diff goes through it, and so do the review TUI's range-diff and its
three-way merge prep.

The reset recurses like any other. A series that touches a submodule
puts a gitlink into the synthesized tree, and the reset then dies in
the same fresh worktree with no submodule clones. The am is worse.
Those commits exist to compute a diff range and nothing ever references
them, but git still reaches for the user's signing key, and with a card
that is not plugged in the whole range fails.

Both get SCRATCH_GIT_OPTS.

Signed-off-by: Christian Brauner (Amutable) <[email protected]>
---
 src/b4/__init__.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/b4/__init__.py b/src/b4/__init__.py
index 1a883b4..d418cee 100644
--- a/src/b4/__init__.py
+++ b/src/b4/__init__.py
@@ -1449,13 +1449,15 @@ class LoreSeries:
                 return None, None
             start_commit = out.strip()
             logger.debug('start_commit=%s', start_commit)
-            git_run_command(dfn, ['reset', '--hard', start_commit])
+            git_run_command(dfn, [*SCRATCH_GIT_OPTS, 'reset', '--hard', start_commit])
 
             ifh = io.BytesIO()
             save_git_am_mbox(msgs, ifh)
             ambytes = ifh.getvalue()
 
-            ecode, out = git_run_command(dfn, ['am'], stdin=ambytes, logstderr=True)
+            ecode, out = git_run_command(
+                dfn, [*SCRATCH_GIT_OPTS, 'am'], stdin=ambytes, logstderr=True
+            )
             if ecode > 0:
                 logger.critical('ERROR: Could not fake-am version v%s', self.revision)
                 return None, None

-- 
2.53.0