Add HEAD fix to gitea doctor (#21352)

[ghost]

Backport #21352

Due to a bug in presumably an older version of Gitea, multiple of my repositories still have their HEADs pointing to a master branch while the default branch on the UI is listed as main. This adds a gitea doctor command that will fix all of the HEAD references for repos when they're not synchronized with the default branch in the DB.

This will help with cloning to ensure that git automatically checks out the right branch, instead of a nonexistent one.

Note: I'm not sure if I actually need to do more other than add a file here. Will try testing this out on my server soon.

Co-authored-by: zeripath [email protected]
Co-authored-by: wxiaoguang [email protected]

[delvh]

Suggested change

	if defaultBranchErr != nil {
	numDefaultBranchesBroken++
	}
	// if default branch is broken, let the user fix that in the UI
	if defaultBranchErr != nil {
	// if default branch is broken, let the user fix that in the UI
	if defaultBranchErr != nil {
	numDefaultBranchesBroken++

[delvh]

Suggested change

	logger.Info("Out of %d repos, HEADs for %d are now fixed and HEADS for %d are still broken", numRepos, numReposUpdated, numDefaultBranchesBroken+numHeadsBroken-numReposUpdated)
	} else {
	if numHeadsBroken == 0 && numDefaultBranchesBroken == 0 {
	logger.Info("All %d repos have their HEADs in the correct state")
	} else {
	if numHeadsBroken == 0 && numDefaultBranchesBroken != 0 {
	logger.Critical("Default branches are broken for %d/%d repos", numDefaultBranchesBroken, numRepos)
	} else if numHeadsBroken != 0 && numDefaultBranchesBroken == 0 {
	logger.Warn("HEADs are broken for %d/%d repos", numHeadsBroken, numRepos)
	} else {
	logger.Critical("Out of %d repos, HEADS are broken for %d and default branches are broken for %d", numRepos, numHeadsBroken, numDefaultBranchesBroken)
	}
	}
	logger.Info("Out of %d repos, HEADs for %d are now fixed and HEADS for %d are still broken", numRepos, numReposUpdated, numDefaultBranchesBroken+numHeadsBroken-numReposUpdated)
	return nil
	}
	if numHeadsBroken == 0 && numDefaultBranchesBroken == 0 {
	logger.Info("All %d repos have their HEADs in the correct state")
	return nil
	}
	if numHeadsBroken == 0 && numDefaultBranchesBroken != 0 {
	logger.Critical("Default branches are broken for %d/%d repos", numDefaultBranchesBroken, numRepos)
	} else if numHeadsBroken != 0 && numDefaultBranchesBroken == 0 {
	logger.Warn("HEADs are broken for %d/%d repos", numHeadsBroken, numRepos)
	} else {
	logger.Critical("Out of %d repos, HEADS are broken for %d and default branches are broken for %d", numRepos, numHeadsBroken, numDefaultBranchesBroken)
	}

[delvh]

Oh wait, I just noticed that this is a backport.
Ignore the stylistic things then 😓

[lunny]

make L-G-T-M work