Merge branch 'jv-add-sql-migrations' into 'master'

Add sql-migrate subcommand to Praefect

See merge request gitlab-org/gitaly!1738

15 files changed, 331 insertions, 85 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 411af8927..7e2f4b9dc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -211,3 +211,4 @@ praefect_sql_connect:
     - PGPASSWORD=$POSTGRES_PASSWORD psql -h postgres -U $POSTGRES_USER -d $POSTGRES_DB -c 'select now()'
     - ruby -rerb -e 'ERB.new(ARGF.read).run' _support/config.praefect.toml.ci-sql-test.erb > config.praefect.toml
     - ./praefect -config config.praefect.toml sql-ping
+    - ./praefect -config config.praefect.toml sql-migrate
diff --git a/NOTICE b/NOTICE
index 01e9f6095..b872397a2 100644
--- a/NOTICE
+++ b/NOTICE
@@ -2380,6 +2380,53 @@ Copyright 2014-2015 The Prometheus Authors
 This product includes software developed at
 SoundCloud Ltd. (http://soundcloud.com/).
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+LICENSE - gitlab.com/gitlab-org/gitaly/vendor/github.com/rubenv/sql-migrate
+MIT License
+
+Copyright (C) 2014-2019 by Ruben Vermeersch <ruben@rocketeer.be>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+LICENSE - gitlab.com/gitlab-org/gitaly/vendor/github.com/rubenv/sql-migrate/sqlparse
+MIT License
+
+Copyright (C) 2014-2017 by Ruben Vermeersch <ruben@rocketeer.be>
+Copyright (C) 2012-2014 by Liam Staskawicz
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 LICENSE - gitlab.com/gitlab-org/gitaly/vendor/github.com/sebest/xff
 Copyright (c) 2015 Sebastien Estienne (sebastien.estienne@gmail.com)
 
@@ -2886,59 +2933,6 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-LICENSE - gitlab.com/gitlab-org/gitaly/vendor/golang.org/x/crypto
-Copyright (c) 2009 The Go Authors. All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-   * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-   * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-   * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-PATENTS - gitlab.com/gitlab-org/gitaly/vendor/golang.org/x/crypto
-Additional IP Rights Grant (Patents)
-
-"This implementation" means the copyrightable works distributed by
-Google as part of the Go project.
-
-Google hereby grants to You a perpetual, worldwide, non-exclusive,
-no-charge, royalty-free, irrevocable (except as stated in this section)
-patent license to make, have made, use, offer to sell, sell, import,
-transfer and otherwise run, modify and propagate the contents of this
-implementation of Go, where such license applies only to those patent
-claims, both currently owned or controlled by Google and acquired in
-the future, licensable by Google that are necessarily infringed by this
-implementation of Go.  This grant does not include claims that would be
-infringed only as a consequence of further modification of this
-implementation.  If you or your agent or exclusive licensee institute or
-order or agree to the institution of patent litigation against any
-entity (including a cross-claim or counterclaim in a lawsuit) alleging
-that this implementation of Go or any code incorporated within this
-implementation of Go constitutes direct or contributory patent
-infringement, or inducement of patent infringement, then any patent
-rights granted to you under this License for this implementation of Go
-shall terminate as of the date such litigation is filed.
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 LICENSE - gitlab.com/gitlab-org/gitaly/vendor/golang.org/x/net
 Copyright (c) 2009 The Go Authors. All rights reserved.
 
@@ -3588,6 +3582,30 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 LICENSE-3rdparty.csv - gitlab.com/gitlab-org/gitaly/vendor/gopkg.in/DataDog/dd-trace-go.v1
 Component,Origin,License,Copyright
 import,io.opentracing,Apache-2.0,Copyright 2016-2017 The OpenTracing Authors~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+LICENSE - gitlab.com/gitlab-org/gitaly/vendor/gopkg.in/gorp.v1
+(The MIT License)
+
+Copyright (c) 2012 James Cooper <james@bitmechanic.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 LICENSE - gitlab.com/gitlab-org/gitaly/vendor/gopkg.in/yaml.v2
                                  Apache License
                            Version 2.0, January 2004
diff --git a/_support/new-migration b/_support/new-migration
new file mode 100755
index 000000000..f08eec2a5
--- /dev/null
+++ b/_support/new-migration
@@ -0,0 +1,38 @@
+#!/usr/bin/env ruby
+require 'erb'
+
+PROGNAME = File.basename(__FILE__)
+MIGRATIONS_DIR = 'internal/praefect/datastore/migrations'
+
+def main(migration_name)
+  unless /\A[a-z0-9_]+\z/ =~ migration_name
+    abort "invalid migration name #{migration_name.inspect} (only a-z0-9_ are allowed)"
+  end
+
+  sequence_number = Time.now.utc.strftime('%Y%m%d%H%M%S')
+ 
+  migration_file =  File.join(MIGRATIONS_DIR, "#{sequence_number}_#{migration_name}.go")
+  warn "#{PROGNAME}: creating #{migration_file}"
+  IO.write(migration_file, ERB.new(DATA.read).result(binding))
+end
+
+unless ARGV.count == 1
+  abort "usage: #{PROGNAME} MIGRATION_NAME"
+end
+
+main(*ARGV)
+
+__END__
+package migrations
+
+import migrate "github.com/rubenv/sql-migrate"
+
+func init() {
+	m := &migrate.Migration{
+		Id:   "<%= sequence_number %>_<%= migration_name %>",
+		Up:   []string{},
+		Down: []string{},
+	}
+
+	allMigrations = append(allMigrations, m)
+}
diff --git a/changelogs/unreleased/jv-add-sql-migrations.yml b/changelogs/unreleased/jv-add-sql-migrations.yml
new file mode 100644
index 000000000..fe0eda517
--- /dev/null
+++ b/changelogs/unreleased/jv-add-sql-migrations.yml
@@ -0,0 +1,5 @@
+---
+title: Add sql-migrate subcommand to Praefect
+merge_request: 1738
+author:
+type: added
diff --git a/cmd/praefect/main.go b/cmd/praefect/main.go
index 451c56e65..8536cdbbe 100644
--- a/cmd/praefect/main.go
+++ b/cmd/praefect/main.go
@@ -205,26 +205,3 @@ func testSQLConnection(logger *logrus.Entry, conf config.Config) {
 		logger.Info("SQL connection check successful")
 	}
 }
-
-// subCommand returns an exit code, to be fed into os.Exit.
-func subCommand(conf config.Config, arg0 string, argRest []string) int {
-	switch arg0 {
-	case "sql-ping":
-		return sqlPing(conf)
-	default:
-		fmt.Printf("%s: unknown subcommand: %q\n", progname, arg0)
-		return 1
-	}
-}
-
-func sqlPing(conf config.Config) int {
-	const subCmd = progname + " sql-ping"
-
-	if err := datastore.CheckPostgresVersion(conf); err != nil {
-		fmt.Printf("%s: fail: %v\n", subCmd, err)
-		return 1
-	}
-
-	fmt.Printf("%s: OK\n", subCmd)
-	return 0
-}
diff --git a/cmd/praefect/subcommand.go b/cmd/praefect/subcommand.go
new file mode 100644
index 000000000..48f5b0387
--- /dev/null
+++ b/cmd/praefect/subcommand.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"gitlab.com/gitlab-org/gitaly/internal/praefect/config"
+	"gitlab.com/gitlab-org/gitaly/internal/praefect/datastore"
+)
+
+// subCommand returns an exit code, to be fed into os.Exit.
+func subCommand(conf config.Config, arg0 string, argRest []string) int {
+	switch arg0 {
+	case "sql-ping":
+		return sqlPing(conf)
+	case "sql-migrate":
+		return sqlMigrate(conf)
+	default:
+		fmt.Printf("%s: unknown subcommand: %q\n", progname, arg0)
+		return 1
+	}
+}
+
+func sqlPing(conf config.Config) int {
+	const subCmd = progname + " sql-ping"
+
+	if err := datastore.CheckPostgresVersion(conf); err != nil {
+		printfErr("%s: fail: %v\n", subCmd, err)
+		return 1
+	}
+
+	fmt.Printf("%s: OK\n", subCmd)
+	return 0
+}
+
+func sqlMigrate(conf config.Config) int {
+	const subCmd = progname + " sql-migrate"
+
+	n, err := datastore.Migrate(conf)
+	if err != nil {
+		printfErr("%s: fail: %v\n", subCmd, err)
+		return 1
+	}
+
+	fmt.Printf("%s: OK (applied %d migrations)\n", subCmd, n)
+	return 0
+}
+
+func printfErr(format string, a ...interface{}) (int, error) {
+	return fmt.Fprintf(os.Stderr, format, a...)
+}
diff --git a/doc/README.md b/doc/README.md
index d558b867e..66b327c09 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -16,6 +16,7 @@ The reference guide is documented in https://gitlab.com/gitlab-org/gitlab/blob/m
 - When developing on Gitaly-Ruby, read the [Gitaly-Ruby doc](doc/ruby_endpoint.md)
 - The Gitaly release process is described in [our process doc](doc/PROCESS.md)
 - Tests use Git repositories too, [read more about them](doc/test_repos.md)
+- Praefect uses SQL. To create a new SQL migration see [sql_migrations.md](sql_migrations.md)
 
 #### Gitaly HA
 
diff --git a/doc/sql_migrations.md b/doc/sql_migrations.md
new file mode 100644
index 000000000..a4d9b6fef
--- /dev/null
+++ b/doc/sql_migrations.md
@@ -0,0 +1,13 @@
+# SQL migrations in Praefect
+
+SQL migration files are stored in `/internal/praefect/datastore/migrations`.
+
+The underlying migration engine we use is [github.com/rubenv/sql-migrate](https://github.com/rubenv/sql-migrate).
+
+To generate a new migration, run the `_support/new-migration` script from the top level of your Gitaly checkout.
+
+Praefect SQL migrations should be applied automatically when you deploy Praefect. If you want to run them manually, run:
+
+```
+praefect -config /path/to/config.toml sql-migrate
+```
diff --git a/go.mod b/go.mod
index 3dfe1487c..4a24d1eac 100644
--- a/go.mod
+++ b/go.mod
@@ -14,18 +14,17 @@ require (
 	github.com/libgit2/git2go v0.0.0-20190104134018-ecaeb7a21d47
 	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/procfs v0.0.3 // indirect
-	github.com/sirupsen/logrus v1.3.0
+	github.com/rubenv/sql-migrate v0.0.0-20191213152630-06338513c237
+	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.4.0
 	github.com/tinylib/msgp v1.1.0 // indirect
 	gitlab.com/gitlab-org/labkit v0.0.0-20190902063225-3253d7975ca7
-	golang.org/x/net v0.0.0-20190613194153-d28f0bde5980
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58
+	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 	golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a
-	golang.org/x/text v0.3.2 // indirect
 	google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898 // indirect
 	google.golang.org/grpc v1.24.0
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
-	gopkg.in/yaml.v2 v2.2.2
+	gopkg.in/yaml.v2 v2.2.5
 )
 
 go 1.12
diff --git a/go.sum b/go.sum
index ffc6b5322..44de65a1d 100644
--- a/go.sum
+++ b/go.sum
@@ -8,6 +8,8 @@ github.com/Shopify/goreferrer v0.0.0-20181106222321-ec9c9a553398/go.mod h1:a1uqR
 github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/aymerick/raymond v2.0.2+incompatible/go.mod h1:osfaiScAUVup+UC9Nfq76eWqDhXlp+4UYaA8uhTBO6g=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
@@ -15,6 +17,7 @@ github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/certifi/gocertifi v0.0.0-20180905225744-ee1a9a0726d2 h1:MmeatFT1pTPSVb4nkPmBFN/LRZ97vPjsFKsZrU3KKTs=
 github.com/certifi/gocertifi v0.0.0-20180905225744-ee1a9a0726d2/go.mod h1:GJKEexRPVJrBSOjoqN5VNOIKJ5Q3RViH6eu3puDRwx4=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
@@ -25,11 +28,17 @@ github.com/cloudflare/tableflip v0.0.0-20190329062924-8392f1641731/go.mod h1:erh
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd h1:qMd81Ts1T2OTKmB4acZcyKaMtRnY5Y44NuXGX2GFJ1w=
 github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
 github.com/codegangsta/inject v0.0.0-20150114235600-33e0aa1cb7c0/go.mod h1:4Zcjuz89kmFXt9morQgcfYZAYZ5n8WHjt81YYWIwtTM=
+github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/denisenkom/go-mssqldb v0.0.0-20191001013358-cfbb681360f0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/eknkc/amber v0.0.0-20171010120322-cdade1c07385/go.mod h1:0vRUJqYpeSZifjYj7uP3BG/gKcuzL9xWVV/Y+cK33KM=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
 github.com/flosch/pongo2 v0.0.0-20190707114632-bbf5a6c351f4/go.mod h1:T9YF2M40nIgbVgp3rreNmTged+9HrbNTIQf1PsaIiTA=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
@@ -46,9 +55,21 @@ github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-martini/martini v0.0.0-20170121215854-22fa46961aab/go.mod h1:/P9AEU963A2AYjv4d1V5eVL1CQbEJq6aCNHDDjibzu8=
+github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
+github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/gobuffalo/envy v1.7.0/go.mod h1:n7DRkBerg/aorDM8kbduw5dN3oXGswK5liaSCx4T5NI=
+github.com/gobuffalo/envy v1.7.1 h1:OQl5ys5MBea7OGCdvPbBJWRgnhC/fGona6QKfvFeau8=
+github.com/gobuffalo/envy v1.7.1/go.mod h1:FurDp9+EDPE4aIUS3ZLyD+7/9fpx7YRt/ukY6jIHf0w=
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@@ -142,6 +181,7 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
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@@ -188,6 +244,7 @@ github.com/uber/jaeger-client-go v2.15.0+incompatible/go.mod h1:WVhlPFC8FDjOFMMW
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@@ -196,18 +253,24 @@ github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV
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 gitlab.com/gitlab-org/labkit v0.0.0-20190902063225-3253d7975ca7 h1:SjRvqPKdE28stndKtjq2uxqWuxd66LHVlgNo3Bee6J0=
 gitlab.com/gitlab-org/labkit v0.0.0-20190902063225-3253d7975ca7/go.mod h1:sbAEvWjYMLbm6k0ZY3wS6anrwVCPslOv0CvfLmIbFZU=
 go.uber.org/atomic v1.3.2 h1:2Oa65PReHzfn29GpvgsYwloV9AVFHPDk8tYxt2c2tr4=
 go.uber.org/atomic v1.3.2/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
+golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 h1:HuIa8hRrWRSrqYzx1qI49NNxhdi2PrY7gxVSq1JjLDc=
 golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
@@ -223,8 +286,9 @@ golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190613194153-d28f0bde5980 h1:dfGZHvZk057jK2MCeWus/TowKpJ8y4AmooUzdBSR9GU=
-golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be h1:vEDujvNQGv4jgYKudGeI/+DAX4Jffq6hpD55MmoEvKs=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
@@ -234,15 +298,21 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FY
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190306220723-b294cbcfc56d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190515120540-06a5c4944438/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
@@ -255,8 +325,12 @@ golang.org/x/tools v0.0.0-20181221001348-537d06c36207/go.mod h1:n7NCudcB/nEzxVGm
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20191004055002-72853e10c5a3/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0 h1:igQkv0AAhEIvTEpD5LIpAfav2eeVO9HBTjvKHVJPRSs=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.6.5 h1:tycE03LOZYQNhDpS27tcQdAzLCVMaj7QT2SXxebnpCM=
+google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898 h1:yvw+zsSmSM02Z5H3ZdEV7B7Ql7eFrjQTnmByJvK+3J8=
 google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
@@ -271,15 +345,20 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
+gopkg.in/gorp.v1 v1.7.2 h1:j3DWlAyGVv8whO7AcIWznQ2Yj7yJkn34B8s63GViAAw=
+gopkg.in/gorp.v1 v1.7.2/go.mod h1:Wo3h+DBQZIxATwftsglhdD/62zRFPhGhTiu5jUJmCaw=
 gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/internal/praefect/datastore/db.go b/internal/praefect/datastore/db.go
index 2a0fa1cfd..d84d9b3ee 100644
--- a/internal/praefect/datastore/db.go
+++ b/internal/praefect/datastore/db.go
@@ -8,14 +8,16 @@ import (
 
 	// Blank import to enable integration of github.com/lib/pq into database/sql
 	_ "github.com/lib/pq"
+	migrate "github.com/rubenv/sql-migrate"
 	"gitlab.com/gitlab-org/gitaly/internal/praefect/config"
+	"gitlab.com/gitlab-org/gitaly/internal/praefect/datastore/migrations"
 )
 
 // CheckPostgresVersion checks the server version of the Postgres DB
 // specified in conf. This is a diagnostic for the Praefect Postgres
 // rollout. https://gitlab.com/gitlab-org/gitaly/issues/1755
 func CheckPostgresVersion(conf config.Config) error {
-	db, err := sql.Open("postgres", conf.DB.ToPQString())
+	db, err := openDB(conf)
 	if err != nil {
 		return fmt.Errorf("sql open: %v", err)
 	}
@@ -36,3 +38,18 @@ func CheckPostgresVersion(conf config.Config) error {
 
 	return nil
 }
+
+func openDB(conf config.Config) (*sql.DB, error) { return sql.Open("postgres", conf.DB.ToPQString()) }
+
+// Migrate will apply all pending SQL migrations
+func Migrate(conf config.Config) (int, error) {
+	db, err := openDB(conf)
+	if err != nil {
+		return 0, fmt.Errorf("sql open: %v", err)
+	}
+	defer db.Close()
+
+	migrationSource := &migrate.MemoryMigrationSource{Migrations: migrations.All()}
+
+	return migrate.Exec(db, "postgres", migrationSource, migrate.Up)
+}
diff --git a/internal/praefect/datastore/migrations/20200109161404_hello_world.go b/internal/praefect/datastore/migrations/20200109161404_hello_world.go
new file mode 100644
index 000000000..e96de5232
--- /dev/null
+++ b/internal/praefect/datastore/migrations/20200109161404_hello_world.go
@@ -0,0 +1,13 @@
+package migrations
+
+import migrate "github.com/rubenv/sql-migrate"
+
+func init() {
+	m := &migrate.Migration{
+		Id:   "20200109161404_hello_world",
+		Up:   []string{"CREATE TABLE hello_world (id integer)"},
+		Down: []string{"DROP TABLE hello_world"},
+	}
+
+	allMigrations = append(allMigrations, m)
+}
diff --git a/internal/praefect/datastore/migrations/20200113151438_1_test_migration.go b/internal/praefect/datastore/migrations/20200113151438_1_test_migration.go
new file mode 100644
index 000000000..1dd6ea7ae
--- /dev/null
+++ b/internal/praefect/datastore/migrations/20200113151438_1_test_migration.go
@@ -0,0 +1,13 @@
+package migrations
+
+import migrate "github.com/rubenv/sql-migrate"
+
+func init() {
+	m := &migrate.Migration{
+		Id:   "20200113151438_1_test_migration",
+		Up:   []string{"INSERT INTO hello_world (id) VALUES (1)"},
+		Down: []string{"DELETE FROM hello_world WHERE id = 1"},
+	}
+
+	allMigrations = append(allMigrations, m)
+}
diff --git a/internal/praefect/datastore/migrations/README.md b/internal/praefect/datastore/migrations/README.md
new file mode 100644
index 000000000..0354ba71e
--- /dev/null
+++ b/internal/praefect/datastore/migrations/README.md
@@ -0,0 +1,3 @@
+# Praefect SQL migrations
+
+This direction holds the Praefect SQL migration definitions. See [sql_migrations.md](../../../../doc/sql_migrations.md).
diff --git a/internal/praefect/datastore/migrations/migrations.go b/internal/praefect/datastore/migrations/migrations.go
new file mode 100644
index 000000000..1d5c0c0a2
--- /dev/null
+++ b/internal/praefect/datastore/migrations/migrations.go
@@ -0,0 +1,18 @@
+package migrations
+
+import (
+	migrate "github.com/rubenv/sql-migrate"
+)
+
+const migrationTableName = "schema_migrations"
+
+var allMigrations []*migrate.Migration
+
+func init() {
+	migrate.SetTable(migrationTableName)
+}
+
+// All returns all migrations defined in the package
+func All() []*migrate.Migration {
+	return allMigrations
+}