Panic on sha256 object format repo

[feefladder]

Description of the bug

When initializing a repo with git init --object-format=sha256, git-branchless init panics.

Expected behavior

git-branchless initializes.

Actual behavior

It panics because compatobjectformat extension is not supported

Message:  A fatal error occurred: 
   0: could not open repository: unsupported extension name extensions.compatobjectformat; class=Repository (6)
   1: unsupported extension name extensions.compatobjectformat; class=Repository (6)


Location:
   /home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/git-branchless-init-0.10.0/src/lib.rs:609

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ SPANTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

   0: git_branchless_init::command_init with effects=<Output fancy=true> git_run_info=<GitRunInfo path_to_git="git" working_directory="/home/user/git/NGodoT" env=not shown> main_branch_name=None
      at /home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/git-branchless-init-0.10.0/src/lib.rs:602
   1: git_branchless_init::command_main with ctx=CommandContext { effects: <Output fancy=true>, git_run_info: <GitRunInfo path_to_git="git" working_directory="/home/user/git/NGodoT" env=not shown> } args=InitArgs { uninstall: false, main_branch_name: None }
      at /home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/git-branchless-init-0.10.0/src/lib.rs:671

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                                ⋮ 3 frames hidden ⋮                               
   4: git_branchless_init::command_main::h99002ef25cb9130f
      at <unknown source file>:<unknown line>
   5: git_branchless::commands::command_main::hf52f5ca85a6d7010
      at <unknown source file>:<unknown line>
   6: git_branchless_invoke::do_main_and_drop_locals::heb4a7056cf11877e
      at <unknown source file>:<unknown line>
   7: git_branchless::commands::main::h4c8324ab2e7acc2a
      at <unknown source file>:<unknown line>
   8: std::sys::backtrace::__rust_begin_short_backtrace::h0eb54fb2c20464ef
      at <unknown source file>:<unknown line>
   9: std::rt::lang_start::{{closure}}::h7c49020a9b1d4651
      at <unknown source file>:<unknown line>
  10: std::rt::lang_start_internal::ha8ef919ae4984948
      at <unknown source file>:<unknown line>
  11: main<unknown>
      at <unknown source file>:<unknown line>
  12: __libc_start_call_main<unknown>
      at ./csu/../sysdeps/nptl/libc_start_call_main.h:58
  13: __libc_start_main_impl<unknown>
      at ./csu/../csu/libc-start.c:360
  14: _start<unknown>
      at <unknown source file>:<unknown line>

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
Run with RUST_BACKTRACE=full to include source snippets.
Location: /home/user/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/git-branchless-0.10.0/src/commands/mod.rs:235

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                                ⋮ 8 frames hidden ⋮                               
   9: core::result::Result<T,E>::expect::h02ee06867496db48
      at <unknown source file>:<unknown line>
  10: git_branchless::commands::main::h4c8324ab2e7acc2a
      at <unknown source file>:<unknown line>
  11: std::sys::backtrace::__rust_begin_short_backtrace::h0eb54fb2c20464ef
      at <unknown source file>:<unknown line>
  12: std::rt::lang_start::{{closure}}::h7c49020a9b1d4651
      at <unknown source file>:<unknown line>
  13: std::rt::lang_start_internal::ha8ef919ae4984948
      at <unknown source file>:<unknown line>
  14: main<unknown>
      at <unknown source file>:<unknown line>
  15: __libc_start_call_main<unknown>
      at ./csu/../sysdeps/nptl/libc_start_call_main.h:58
  16: __libc_start_main_impl<unknown>
      at ./csu/../csu/libc-start.c:360
  17: _start<unknown>
      at <unknown source file>:<unknown line>

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
Run with RUST_BACKTRACE=full to include source snippets.

Version of rustc

rustc 1.88.0 (6b00bc388 2025-06-23)

Automated bug report

Software version

git-branchless 0.10.0

Operating system

• OS: Linux (Ubuntu 25.04)
• Kernel: 6.14.0-35-generic

Command-line

/home/user/.cargo/bin/git-branchless bug-report 

Environment variables

SHELL=/bin/bash
EDITOR=<not set>

Git version

> git version 
git version 2.48.1

Hooks

Error: could not open repository: unsupported extension name extensions.compatobjectformat; class=Repository (6)

Events

Error: could not open repository: unsupported extension name extensions.compatobjectformat; class=Repository (6)

Version of git-branchless

git-branchless-opts 0.10.0

Version of git

git version 2.48.1