Fix: Gitea provider returns str instead of bytes, causing repo settings loading failure

[Harrishp]

Fix: Gitea provider returns str instead of bytes, causing repo settings loading failure

Bug Description

When using pr-agent with a Gitea provider, the repository-level configuration file (.pr_agent.toml) fails to load due to a type mismatch. The Gitea provider's get_file_content() returns a str, but utils.py expects bytes — unlike the GitHub provider which returns bytes.

This causes two cascading errors:

1. os.write() fails with "a bytes-like object is required, not 'str'"
2. Error handler crashes with "'str' object has no attribute 'decode'"

As a result, repo-level settings (model, response_language, etc.) are never applied, and pr-agent falls back to global defaults.

Steps to Reproduce

1. Configure pr-agent with git_provider = "gitea" and a local Gitea instance
2. Push a .pr_agent.toml config file to the Gitea repository
3. Run any pr-agent command, e.g.: pr-agent --pr_url="http://gitea-host/owner/repo/pulls/1" review

Expected Behavior

The .pr_agent.toml file should be loaded and its settings should override global defaults.

Actual Behavior

Settings loading fails silently (then crashes the error handler), and global defaults are used instead.

Error Logs

WARNING  | Failed to apply repo local settings, error: a bytes-like object is required, not 'str'
ERROR    | Failed to handle configurations errors
Traceback (most recent call last):
  ...
  File "pr_agent/git_providers/utils.py", line 38, in apply_repo_settings
    os.write(fd, repo_settings)
TypeError: a bytes-like object is required, not 'str'

  File "pr_agent/git_providers/utils.py", line 100, in handle_configurations_errors
    configuration_file_content = err['settings'].decode()
AttributeError: 'str' object has no attribute 'decode'

Root Cause

In pr_agent/git_providers/utils.py:

Line 38 — os.write(fd, repo_settings) expects bytes, but Gitea's get_file_content() returns str.

Line 100 — err['settings'].decode() assumes bytes, but when Gitea is the provider, the value is already a str.

The GitHub provider returns bytes from its file content API, so this issue only affects Gitea.

Suggested Fix

File: pr_agent/git_providers/utils.py

Line 38:

# Before:
os.write(fd, repo_settings)

# After:
os.write(fd, repo_settings if isinstance(repo_settings, bytes) else repo_settings.encode())

Line 100:

# Before:
configuration_file_content = err['settings'].decode()

# After:
configuration_file_content = err['settings'].decode() if isinstance(err['settings'], bytes) else err['settings']

Environment

• pr-agent version: v0.3.1 (branch: gitea-pr-agent, commit: bc1d2362)
• Git provider: Gitea (self-hosted)
• Python: 3.12
• OS: Windows 10