Add debugging features and improve error handling

- Add --test-github-token flag to validate GitHub authentication
- Improve error messages for 401 authentication failures
- Add merge conflict detection before sync attempts
- Stop sync on first error for easier debugging
- Add GitHub repo creation support for --sync and --sync-all commands
- Add detailed token loading debug output
- Create test script for GitHub token validation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/test/test_github_token.sh b/test/test_github_token.sh
new file mode 100755
index 0000000..3078f6f
--- /dev/null
+++ b/test/test_github_token.sh
@@ -0,0 +1,86 @@
+#!/bin/bash
+
+# Test script to validate GitHub token
+set -e
+
+echo "Testing GitHub token authentication..."
+
+# Try to load token from different sources
+TOKEN=""
+
+# 1. Environment variable
+if [ -n "$GITHUB_TOKEN" ]; then
+    echo "Found GITHUB_TOKEN environment variable"
+    TOKEN="$GITHUB_TOKEN"
+fi
+
+# 2. Token file
+if [ -z "$TOKEN" ] && [ -f ~/.gitsyncer_github_token ]; then
+    echo "Found ~/.gitsyncer_github_token file"
+    TOKEN=$(cat ~/.gitsyncer_github_token | tr -d '\n\r ')
+fi
+
+if [ -z "$TOKEN" ]; then
+    echo "ERROR: No GitHub token found!"
+    echo "Please set GITHUB_TOKEN environment variable or create ~/.gitsyncer_github_token file"
+    exit 1
+fi
+
+echo "Token length: ${#TOKEN}"
+echo "Token prefix: ${TOKEN:0:10}..."
+
+# Test the token
+echo ""
+echo "Testing token with GitHub API..."
+RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H "Accept: application/vnd.github.v3+json" \
+    https://api.github.com/user)
+
+HTTP_STATUS=$(echo "$RESPONSE" | grep HTTP_STATUS | cut -d: -f2)
+BODY=$(echo "$RESPONSE" | grep -v HTTP_STATUS)
+
+echo "HTTP Status: $HTTP_STATUS"
+
+if [ "$HTTP_STATUS" = "200" ]; then
+    echo "SUCCESS: Token is valid!"
+    echo "Authenticated as: $(echo "$BODY" | jq -r .login)"
+elif [ "$HTTP_STATUS" = "401" ]; then
+    echo "ERROR: Token is invalid (401 Unauthorized)"
+    echo "Response: $BODY"
+    echo ""
+    echo "Common issues:"
+    echo "1. Token has expired"
+    echo "2. Token doesn't have required scopes (need 'repo' scope)"
+    echo "3. Token was revoked"
+    echo ""
+    echo "To create a new token:"
+    echo "1. Go to https://github.com/settings/tokens"
+    echo "2. Click 'Generate new token (classic)'"
+    echo "3. Select 'repo' scope"
+    echo "4. Save the token to ~/.gitsyncer_github_token"
+else
+    echo "ERROR: Unexpected status code: $HTTP_STATUS"
+    echo "Response: $BODY"
+fi
+
+# Test specific repository access
+echo ""
+echo "Testing access to snonux/dtail repository..."
+REPO_RESPONSE=$(curl -s -w "\nHTTP_STATUS:%{http_code}" \
+    -H "Authorization: Bearer $TOKEN" \
+    -H "Accept: application/vnd.github.v3+json" \
+    https://api.github.com/repos/snonux/dtail)
+
+REPO_STATUS=$(echo "$REPO_RESPONSE" | grep HTTP_STATUS | cut -d: -f2)
+REPO_BODY=$(echo "$REPO_RESPONSE" | grep -v HTTP_STATUS)
+
+echo "Repository check status: $REPO_STATUS"
+if [ "$REPO_STATUS" = "200" ]; then
+    echo "SUCCESS: Can access repository"
+elif [ "$REPO_STATUS" = "404" ]; then
+    echo "Repository does not exist"
+elif [ "$REPO_STATUS" = "401" ]; then
+    echo "ERROR: Authentication failed for repository"
+    echo "Response: $REPO_BODY"
+fi
\ No newline at end of file