Default runtime now checks out code on demand (#1563)

* Default runtime now checks out code on demand

* Go mod tidy

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/fsouza/go-dockerclient v1.6.0
 	github.com/ghodss/yaml v1.0.0
 	github.com/go-acme/lego/v3 v3.3.0
+	github.com/go-git/go-git/v5 v5.0.0
 	github.com/go-telegram-bot-api/telegram-bot-api v4.6.4+incompatible // indirect
 	github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee
 	github.com/gobwas/pool v0.2.0 // indirect
@@ -61,7 +62,7 @@ require (
 	go.etcd.io/bbolt v1.3.4
 	go.uber.org/zap v1.13.0
 	golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59
-	golang.org/x/net v0.0.0-20200222125558-5a598a2470a0
+	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect
 	google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1
 	google.golang.org/grpc v1.26.0

go.sum

@@ -101,6 +101,7 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
 github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 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=
@@ -146,6 +147,14 @@ github.com/go-acme/lego/v3 v3.3.0 h1:6BePZsOiYA4/w+M7QDytxQtMfCipMPGnWAHs9pWks98
 github.com/go-acme/lego/v3 v3.3.0/go.mod h1:iGSY2vQrvQs3WezicSB/oVbO2eCrD88dpWPwb1qLqu0=
 github.com/go-cmd/cmd v1.0.5/go.mod h1:y8q8qlK5wQibcw63djSl/ntiHUHXHGdCkPk0j4QeW4s=
 github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
+github.com/go-git/gcfg v1.5.0 h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=
+github.com/go-git/gcfg v1.5.0/go.mod h1:5m20vg6GwYabIxaOonVkTdrILxQMpEShl1xiMF4ua+E=
+github.com/go-git/go-billy/v5 v5.0.0 h1:7NQHvd9FVid8VL4qVUMm8XifBK+2xCoZ2lSk0agRrHM=
+github.com/go-git/go-billy/v5 v5.0.0/go.mod h1:pmpqyWchKfYfrkb/UVH4otLvyi/5gJlGI4Hb3ZqZ3W0=
+github.com/go-git/go-git-fixtures/v4 v4.0.1 h1:q+IFMfLx200Q3scvt2hN79JsEzy4AmBTp/pqnefH+Bc=
+github.com/go-git/go-git-fixtures/v4 v4.0.1/go.mod h1:m+ICp2rF3jDhFgEZ/8yziagdT1C+ZpZcrJjappBCDSw=
+github.com/go-git/go-git/v5 v5.0.0 h1:k5RWPm4iJwYtfWoxIJy4wJX9ON7ihPeZZYC1fLYDnpg=
+github.com/go-git/go-git/v5 v5.0.0/go.mod h1:oYD8y9kWsGINPFJoLdaScGCN6dlKg23blmClfZwtUVA=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-ini/ini v1.44.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
@@ -263,6 +272,8 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/pty v1.1.8/go.mod h1:O1sed60cT9XZ5uDucP5qwvh+TE3NnUj51EiZO/lmSfw=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/labbsr0x/bindman-dns-webhook v1.0.2/go.mod h1:p6b+VCXIR8NYKpDr8/dg1HKfQoRHCdcsROXKvmoehKA=
 github.com/labbsr0x/goh v1.0.1/go.mod h1:8K2UhVoaWXcCU7Lxoa2omWnC8gyW8px7/lmO61c027w=
 github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=
@@ -317,6 +328,8 @@ github.com/nats-io/nkeys v0.1.4/go.mod h1:XdZpAbhgyyODYqjTawOnIOI7VlbKSarI9Gfy1t
 github.com/nats-io/nuid v1.0.1 h1:5iA8DT8V7q8WK2EScv2padNa/rTESc1KdnPw4TC2paw=
 github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
 github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/nlopes/slack v0.6.1-0.20191106133607-d06c2a2b3249 h1:Pr5gZa2VcmktVwq0lyC39MsN5tz356vC/pQHKvq+QBo=
 github.com/nlopes/slack v0.6.1-0.20191106133607-d06c2a2b3249/go.mod h1:JzQ9m3PMAqcpeCam7UaHSuBuupz7CmpjehYMayT6YOk=
 github.com/nrdcg/auroradns v1.0.0/go.mod h1:6JPXKzIRzZzMqtTDgueIhTi6rFf1QvYE/HzqidhOhjw=
@@ -385,6 +398,8 @@ github.com/sacloud/libsacloud v1.26.1/go.mod h1:79ZwATmHLIFZIMd7sxA3LwzVy/B77uj3
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
+github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
+github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
@@ -456,6 +471,7 @@ golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4/go.mod h1:yigFU9vqHzYiE8U
 golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190927123631-a832865fa7ad/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 h1:3zb4D3T4G8jdExgVU/95+vQXfpEPiMdCaZgmGVxjNHM=
 golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -500,8 +516,8 @@ golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191027093000-83d349e8ac1a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200222125558-5a598a2470a0 h1:MsuvTghUPjX762sGLnGsxC3HM0B5r83wEtYcYR8/vRs=
+golang.org/x/net v0.0.0-20200301022130-244492dfa37a h1:GuSPYbZzB5/dcLNCwLQLsg3obCJtX9IJhpXkvY7kzk0=
-golang.org/x/net v0.0.0-20200222125558-5a598a2470a0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -539,6 +555,8 @@ golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe h1:6fAMxZRR6sl1Uq8U61gxU+kPT
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 h1:LfCXLvNmTYH9kEmVgqbnsWfruoXZIrh4YBgqVHtDvw0=
 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 h1:uYVVQ9WP/Ds2ROhcaGPeIdVq0RIXVLwsHlnvJ+cT1So=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
@@ -612,6 +630,9 @@ gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLks
 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/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/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=
@@ -639,6 +660,8 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 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 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

runtime/default.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/hpcloud/tail"
 	"github.com/micro/go-micro/v2/logger"
+	"github.com/micro/go-micro/v2/runtime/local/git"
 )
 
 type runtime struct {
@@ -52,6 +53,21 @@ func NewRuntime(opts ...Option) Runtime {
 	}
 }
 
+// @todo move this to runtime default
+func (r *runtime) checkoutSourceIfNeeded(s *Service) error {
+	source, err := git.ParseSourceLocal("", s.Source)
+	if err != nil {
+		return err
+	}
+	source.Ref = s.Version
+	err = git.CheckoutSource(os.TempDir(), source)
+	if err != nil {
+		return err
+	}
+	s.Source = source.FullPath
+	return nil
+}
+
 // Init initializes runtime options
 func (r *runtime) Init(opts ...Option) error {
 	r.Lock()
@@ -193,6 +209,7 @@ func serviceKey(s *Service) string {
 
 // Create creates a new service which is then started by runtime
 func (r *runtime) Create(s *Service, opts ...CreateOption) error {
+	r.checkoutSourceIfNeeded(s)
 	r.Lock()
 	defer r.Unlock()
 
@@ -336,6 +353,7 @@ func (r *runtime) Read(opts ...ReadOption) ([]*Service, error) {
 
 // Update attemps to update the service
 func (r *runtime) Update(s *Service, opts ...UpdateOption) error {
+	r.checkoutSourceIfNeeded(s)
 	r.Lock()
 	service, ok := r.services[serviceKey(s)]
 	r.Unlock()

runtime/local/git/git.go

@@ -0,0 +1,333 @@
+package git
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
+)
+
+type Gitter interface {
+	Clone(repo string) error
+	FetchAll(repo string) error
+	Checkout(repo, branchOrCommit string) error
+	RepoDir(repo string) string
+}
+
+type libGitter struct {
+	folder string
+}
+
+func (g libGitter) Clone(repo string) error {
+	fold := filepath.Join(g.folder, dirifyRepo(repo))
+	exists, err := pathExists(fold)
+	if err != nil {
+		return err
+	}
+	if exists {
+		return nil
+	}
+	_, err = git.PlainClone(fold, false, &git.CloneOptions{
+		URL:      repo,
+		Progress: os.Stdout,
+	})
+	return err
+}
+
+func (g libGitter) FetchAll(repo string) error {
+	repos, err := git.PlainOpen(filepath.Join(g.folder, dirifyRepo(repo)))
+	if err != nil {
+		return err
+	}
+	remotes, err := repos.Remotes()
+	if err != nil {
+		return err
+	}
+
+	err = remotes[0].Fetch(&git.FetchOptions{
+		RefSpecs: []config.RefSpec{"refs/*:refs/*", "HEAD:refs/heads/HEAD"},
+		Progress: os.Stdout,
+		Depth:    1,
+	})
+	if err != nil && err != git.NoErrAlreadyUpToDate {
+		return err
+	}
+	return nil
+}
+
+func (g libGitter) Checkout(repo, branchOrCommit string) error {
+	if branchOrCommit == "latest" {
+		branchOrCommit = "master"
+	}
+	repos, err := git.PlainOpen(filepath.Join(g.folder, dirifyRepo(repo)))
+	if err != nil {
+		return err
+	}
+	worktree, err := repos.Worktree()
+	if err != nil {
+		return err
+	}
+	isCommit := func(s string) bool {
+		return strings.ContainsAny(s, "0123456789") && len(s) == 40
+	}
+	if isCommit(branchOrCommit) {
+		err = worktree.Checkout(&git.CheckoutOptions{
+			Hash:  plumbing.NewHash(branchOrCommit),
+			Force: true,
+		})
+		if err != nil {
+			return err
+		}
+	} else {
+		err = worktree.Checkout(&git.CheckoutOptions{
+			Branch: plumbing.NewBranchReferenceName(branchOrCommit),
+			Force:  true,
+		})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (g libGitter) RepoDir(repo string) string {
+	return filepath.Join(g.folder, dirifyRepo(repo))
+}
+
+type binaryGitter struct {
+	folder string
+}
+
+func (g binaryGitter) Clone(repo string) error {
+	fold := filepath.Join(g.folder, dirifyRepo(repo))
+	exists, err := pathExists(fold)
+	if err != nil {
+		return err
+	}
+	if exists {
+		return nil
+	}
+	cmd := exec.Command("git", "clone", repo, ".")
+
+	err = os.MkdirAll(fold, 0777)
+	if err != nil {
+		return err
+	}
+	cmd.Dir = fold
+	_, err = cmd.Output()
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (g binaryGitter) FetchAll(repo string) error {
+	cmd := exec.Command("git", "fetch", "--all")
+	cmd.Dir = filepath.Join(g.folder, dirifyRepo(repo))
+	_, err := cmd.Output()
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (g binaryGitter) Checkout(repo, branchOrCommit string) error {
+	if branchOrCommit == "latest" {
+		branchOrCommit = "master"
+	}
+	cmd := exec.Command("git", "checkout", "-f", branchOrCommit)
+	cmd.Dir = filepath.Join(g.folder, dirifyRepo(repo))
+	_, err := cmd.Output()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (g binaryGitter) RepoDir(repo string) string {
+	return filepath.Join(g.folder, dirifyRepo(repo))
+}
+
+func NewGitter(folder string) Gitter {
+	if commandExists("git") {
+		return binaryGitter{folder}
+	}
+	return libGitter{folder}
+}
+
+func commandExists(cmd string) bool {
+	_, err := exec.LookPath(cmd)
+	return err == nil
+}
+
+func dirifyRepo(s string) string {
+	s = strings.ReplaceAll(s, "https://", "")
+	s = strings.ReplaceAll(s, "/", "-")
+	return s
+}
+
+// exists returns whether the given file or directory exists
+func pathExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return true, err
+}
+
+// GetRepoRoot determines the repo root from a full path.
+// Returns empty string and no error if not found
+func GetRepoRoot(fullPath string) (string, error) {
+	// traverse parent directories
+	prev := fullPath
+	for {
+		current := prev
+		exists, err := pathExists(filepath.Join(current, ".git"))
+		if err != nil {
+			return "", err
+		}
+		if exists {
+			return current, nil
+		}
+		prev = filepath.Dir(current)
+		// reached top level, see:
+		// https://play.golang.org/p/rDgVdk3suzb
+		if current == prev {
+			break
+		}
+	}
+	return "", nil
+}
+
+const defaultRepo = "github.com/micro/services"
+
+// Source is not just git related @todo move
+type Source struct {
+	// is it a local folder intended for a local runtime?
+	Local bool
+	// absolute path to service folder in local mode
+	FullPath string
+	// path of folder to repo root
+	// be it local or github repo
+	Folder string
+	// github ref
+	Ref string
+	// for cloning purposes
+	// blank for local
+	Repo string
+	// dir to repo root
+	// blank for non local
+	LocalRepoRoot string
+}
+
+// Name to be passed to RPC call runtime.Create Update Delete
+// eg: `helloworld/api`, `crufter/myrepo/helloworld/api`, `localfolder`
+func (s *Source) RuntimeName() string {
+	if s.Repo == "github.com/micro/services" || s.Repo == "" {
+		return s.Folder
+	}
+	return fmt.Sprintf("%v/%v", strings.ReplaceAll(s.Repo, "github.com/", ""), s.Folder)
+}
+
+// Source to be passed to RPC call runtime.Create Update Delete
+// eg: `helloworld`, `github.com/crufter/myrepo/helloworld`, `/path/to/localrepo/localfolder`
+func (s *Source) RuntimeSource() string {
+	if s.Local {
+		return s.FullPath
+	}
+	if s.Repo == "github.com/micro/services" || s.Repo == "" {
+		return s.Folder
+	}
+	return fmt.Sprintf("%v/%v", s.Repo, s.Folder)
+}
+
+// ParseSource parses a `micro run/update/kill` source.
+func ParseSource(source string) (*Source, error) {
+	// If github is not present, we got a shorthand for `micro/services`
+	if !strings.Contains(source, "github.com") {
+		source = "github.com/micro/services/" + source
+	}
+	if !strings.Contains(source, "@") {
+		source += "@latest"
+	}
+	ret := &Source{}
+	refs := strings.Split(source, "@")
+	ret.Ref = refs[1]
+	parts := strings.Split(refs[0], "/")
+	ret.Repo = strings.Join(parts[0:3], "/")
+	if len(parts) > 1 {
+		ret.Folder = strings.Join(parts[3:], "/")
+	}
+
+	return ret, nil
+}
+
+// ParseSourceLocal detects and handles local pathes too
+// workdir should be used only from the CLI @todo better interface for this function
+func ParseSourceLocal(workDir, source string) (*Source, error) {
+	var localFullPath string
+	if len(workDir) > 0 {
+		localFullPath = filepath.Join(workDir, source)
+	} else {
+		localFullPath = source
+	}
+	if exists, err := pathExists(localFullPath); err == nil && exists {
+		localRepoRoot, err := GetRepoRoot(localFullPath)
+		if err != nil {
+			return nil, err
+		}
+		folder := strings.ReplaceAll(localFullPath, localRepoRoot+string(filepath.Separator), "")
+		return &Source{
+			Local:         true,
+			Folder:        folder,
+			FullPath:      localFullPath,
+			LocalRepoRoot: localRepoRoot,
+			Ref:           "latest", // @todo consider extracting branch from git here
+		}, nil
+	}
+	return ParseSource(source)
+}
+
+// CheckoutSource for the local runtime server
+// folder is the folder to check out the source code to
+// Modifies source path to set it to checked out repo absolute path locally.
+func CheckoutSource(folder string, source *Source) error {
+	// if it's a local folder, do nothing
+	if exists, err := pathExists(source.FullPath); err == nil && exists {
+		return nil
+	}
+	gitter := NewGitter(folder)
+	repo := source.Repo
+	if !strings.Contains(repo, "https://") {
+		repo = "https://" + repo
+	}
+	// Always clone, it's idempotent and only clones if needed
+	err := gitter.Clone(repo)
+	if err != nil {
+		return err
+	}
+	source.FullPath = filepath.Join(gitter.RepoDir(source.Repo), source.Folder)
+	return gitter.Checkout(repo, source.Ref)
+}
+
+// code below is not used yet
+
+var nameExtractRegexp = regexp.MustCompile(`((micro|web)\.Name\(")(.*)("\))`)
+
+func extractServiceName(fileContent []byte) string {
+	hits := nameExtractRegexp.FindAll(fileContent, 1)
+	if len(hits) == 0 {
+		return ""
+	}
+	hit := string(hits[0])
+	return strings.Split(hit, "\"")[1]
+}

runtime/local/git/git_test.go

@@ -0,0 +1,95 @@
+package git
+
+import (
+	"testing"
+)
+
+type parseCase struct {
+	url      string
+	expected *Source
+}
+
+func TestParseSource(t *testing.T) {
+	cases := []parseCase{
+		{
+			url: "helloworld",
+			expected: &Source{
+				Repo:   "github.com/micro/services",
+				Folder: "helloworld",
+				Ref:    "latest",
+			},
+		},
+		{
+			url: "github.com/micro/services/helloworld",
+			expected: &Source{
+				Repo:   "github.com/micro/services",
+				Folder: "helloworld",
+				Ref:    "latest",
+			},
+		},
+		{
+			url: "github.com/micro/services/helloworld@v1.12.1",
+			expected: &Source{
+				Repo:   "github.com/micro/services",
+				Folder: "helloworld",
+				Ref:    "v1.12.1",
+			},
+		},
+		{
+			url: "github.com/micro/services/helloworld@branchname",
+			expected: &Source{
+				Repo:   "github.com/micro/services",
+				Folder: "helloworld",
+				Ref:    "branchname",
+			},
+		},
+		{
+			url: "github.com/crufter/reponame/helloworld@branchname",
+			expected: &Source{
+				Repo:   "github.com/crufter/reponame",
+				Folder: "helloworld",
+				Ref:    "branchname",
+			},
+		},
+	}
+	for i, c := range cases {
+		result, err := ParseSource(c.url)
+		if err != nil {
+			t.Fatalf("Failed case %v: %v", i, err)
+		}
+		if result.Folder != c.expected.Folder {
+			t.Fatalf("Folder does not match for '%v', expected '%v', got '%v'", i, c.expected.Folder, result.Folder)
+		}
+		if result.Repo != c.expected.Repo {
+			t.Fatalf("Repo address does not match for '%v', expected '%v', got '%v'", i, c.expected.Repo, result.Repo)
+		}
+		if result.Ref != c.expected.Ref {
+			t.Fatalf("Ref does not match for '%v', expected '%v', got '%v'", i, c.expected.Ref, result.Ref)
+		}
+	}
+}
+
+type nameCase struct {
+	fileContent string
+	expected    string
+}
+
+func TestServiceNameExtract(t *testing.T) {
+	cases := []nameCase{
+		{
+			fileContent: `func main() {
+			// New Service
+			service := micro.NewService(
+				micro.Name("go.micro.service.helloworld"),
+				micro.Version("latest"),
+			)`,
+			expected: "go.micro.service.helloworld",
+		},
+	}
+	for i, c := range cases {
+		result := extractServiceName([]byte(c.fileContent))
+		if result != c.expected {
+			t.Fatalf("Case %v, expected: %v, got: %v", i, c.expected, result)
+		}
+	}
+}