Function ensureUpstreamIsSet

src/utils/teleport.tsx:215–246

* Ensures that the current branch has an upstream set * If not, sets it to origin/ if that remote branch exists

(branchName: string)

 * If not, sets it to origin/<branchName> if that remote branch exists
 */
async function ensureUpstreamIsSet(branchName: string): Promise<void> {
  // Check if upstream is already set
  const {
    code: upstreamCheckCode
  } = await execFileNoThrow(gitExe(), ['rev-parse', '--abbrev-ref', `${branchName}@{upstream}`]);
  if (upstreamCheckCode === 0) {
    // Upstream is already set
    logForDebugging(`Branch '${branchName}' already has upstream set`);
    return;
  }

  // Check if origin/<branchName> exists
  const {
    code: remoteCheckCode
  } = await execFileNoThrow(gitExe(), ['rev-parse', '--verify', `origin/${branchName}`]);
  if (remoteCheckCode === 0) {
    // Remote branch exists, set upstream
    logForDebugging(`Setting upstream for '${branchName}' to 'origin/${branchName}'`);
    const {
      code: setUpstreamCode,
      stderr: setUpstreamStderr
    } = await execFileNoThrow(gitExe(), ['branch', '--set-upstream-to', `origin/${branchName}`, branchName]);
    if (setUpstreamCode !== 0) {
      logForDebugging(`Failed to set upstream for '${branchName}': ${setUpstreamStderr}`);
      // Don't throw, just log - this is not critical
    } else {
      logForDebugging(`Successfully set upstream for '${branchName}'`);
    }
  } else {
    logForDebugging(`Remote branch 'origin/${branchName}' does not exist, skipping upstream setup`);
  }
}

/**
 * Checks out a specific branch