Add database driver for SQLCipher

[klingtnet]

This is a copy of the existing sqlite3 driver, except that it imports _ "github.com/mutecomm/go-sqlcipher/v4" as database driver. This allows to use migrate with encrypted sqlite databases.

[klingtnet]

Here's a small demo application that I used against my local fork:

package main

import (
        "database/sql"
        "errors"
        "fmt"
        "log"
        "net/url"

        "github.com/golang-migrate/migrate/database/sqlcipher"
        "github.com/golang-migrate/migrate/v4"
        _ "github.com/golang-migrate/migrate/v4/source/file"
        _ "github.com/mutecomm/go-sqlcipher/v4"
)

func main() {
        key := url.QueryEscape("secret")
        dbname := fmt.Sprintf("file:example.db?_pragma_key=%s&_pragma_cipher_page_size=4096", key)
        db, err := sql.Open("sqlite3", dbname)
        if err != nil {
                log.Fatal("sql.Open: ", err)
        }
        driver, err := sqlcipher.WithInstance(db, &sqlcipher.Config{})
        if err != nil {
                log.Fatal("sqlcipher.WithInstance: ", err)
        }

        m, err := migrate.NewWithDatabaseInstance(
                "file://migrations",
                "sqlcipher", driver)
        if err != nil {
                log.Fatal("migrate.NewWithDatabaseInstance: ", err)
        }
        err = m.Up()
        if err != nil {
                if errors.Is(err, migrate.ErrNoChange) {
                        log.Println("already migrated, nothing to do")
                } else {
                        log.Fatal(err)
                }
        }
}

[klingtnet]

/cc @frankbraun

[coveralls]

Pull Request Test Coverage Report for Build 853

• 118 of 176 (67.05%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.5%) to 53.733%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
database/sqlcipher/sqlcipher.go	118	176	67.05%

Totals
Change from base Build 846:	0.5%
Covered Lines:	2764
Relevant Lines:	5144

---

💛 - Coveralls

[klingtnet]

Pull Request Test Coverage Report for Build 851

* **118** of **176**   **(67.05%)**  changed or added relevant lines in **1** file are covered.

* No unchanged relevant lines lost coverage.

* Overall coverage increased (+**0.5%**) to **53.733%**

Changes Missing Coverage Covered Lines Changed/Added Lines %
database/sqlcipher/sqlcipher.go 118 176 67.05%
Totals
Change from base Build 846: 0.5%
Covered Lines: 2764
Relevant Lines: 5144

yellow_heart - Coveralls

I could not find a failing even though the CI run with Go 1.14 exited with 1.

[dhui]

Thanks for the PR!

Add sqlcipher to DATABASE_TEST in the Makefile.

If you want sqlcipher in the CLI, you'll also need to add the proper build_sqlcipher.go file in internal/cli.

[dhui]

link to the sqlite3 db driver

[klingtnet]

Everything done.

[dhui]

Waiting for tests to pass