Gitea will migrate the database model version automatically, but it
should be able to be disabled and keep Gitea shutdown if the version is
not matched.

Change all license headers to comply with REUSE specification.

Fix #16132

Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

Found using
`find . -type f -name '*.go' -print -exec vim {} -c
':%s/fmt\.Errorf(\(.*\)%v\(.*\)err/fmt.Errorf(\1%w\2err/g' -c ':wq' \;`

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Co-authored-by: Andrew Thornton <art27@cantab.net>

* Use default values when provided values are empty

- When provided values are empty like `:3000` would imply that host is
empty, use the default value.
- Resolves #20316

* Update database.go

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

* gofumpt -w -l .

* gofumpt -w -l -extra .

* Add linter

* manual fix

* change make fmt

* Refactor install page (db type)

* set correct default DB HOST for different DB TYPE
* remove legacy TiDB from documents
* unify the usage of DB TYPE, in code we only use "mysql". "MySQL" is only shown to users for friendly name.

* Gitea can use TiDB via MySQL protocol

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

One perennial issue is users running the install page,
changing the database dialect and then suffering with issues

This PR simply resets all of the database.Use flags on
initDBConfig. This should prevent this issue from occuring.

Fix #13788
Fix #5480

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Avatar support minio

* Support repo avatar minio storage

* Add missing migration

* Fix bug

* Fix test

* Add test for minio store type on avatars and repo avatars; Add documents

* Fix bug

* Fix bug

* Add back missed avatar link method

* refactor codes

* Simplify the codes

* Code improvements

* Fix lint

* Fix test mysql

* Fix test mysql

* Fix test mysql

* Fix settings

* Fix test

* fix test

* Fix bug

MySQL in its infinite wisdom determines that UTF8 does not
mean UTF8. Our install scripts know about this and will set
CHARSET to utf8mb4 if we users choose this but... users who
do not explicitly set this variable will default to utf8mb3
without knowing it.

This PR changes the unset CHARSET value to utf8mb4 if users
choose to use mysql.

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Signed-off-by: Andrew Thornton <art27@cantab.net>

Fix #11633

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Test locking immediate for SQLite3

* fix url field separator

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>

* Add support for database schema

* Require setting search_path for the db user

* Add schema setting to admin/config.tmpl

* Use a schema different from default for psql tests

* Update postgres scripts to use custom schema

* Update to xorm/core 0.7.3 and xorm/xorm c37aff9b3a

* Fix migration test

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

* Expose db.SetMaxOpenConns and allow other dbs to set their connection params
* Add note about port exhaustion

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

* move database settings from models to setting

* update docs

* fix checkout pr

* fix tests

* fix lint

* remove unsupported tidb options

* correct wrong variable name

* remove tidb totally