Map dependencies to new URIs with dependency-mapping bindings

Signed-off-by: Emily Casey <[email protected]>

README.md

@@ -29,6 +29,14 @@ The buildpack will do the following for NodeJS applications:
 | `$BPL_GOOGLE_STACKDRIVER_MODULE` | Configure the name of the application.  Defaults to `default-module`.
 | `$BPL_GOOGLE_STACKDRIVER_VERSION` | Configure the version of the application.  Defaults to `<EMPTY>`.
 
+## Bindings
+The buildpack optionally accepts the following bindings:
+
+### Type: `dependency-mapping`
+|Key                   | Value   | Description
+|----------------------|---------|------------
+|`<dependency-digest>` | `<uri>` | If needed, the buildpack will fetch the dependency with digest `<dependency-digest>` from `<uri>`
+
 ## License
 This buildpack is released under version 2.0 of the [Apache License][a].
 

go.mod

@@ -5,8 +5,9 @@ go 1.14
 require (
 	github.com/buildpacks/libcnb v1.15.2
 	github.com/onsi/gomega v1.10.1
-	github.com/paketo-buildpacks/libpak v1.38.0
+	github.com/paketo-buildpacks/libpak v1.39.0
 	github.com/rakyll/statik v0.1.7
 	github.com/sclevine/spec v1.4.0
 	github.com/stretchr/testify v1.6.1
+	golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c // indirect
 )

go.sum

@@ -31,6 +31,8 @@ github.com/heroku/color v0.0.6/go.mod h1:ZBvOcx7cTF2QKOv4LbmoBtNl5uB17qWxGuzZrsi
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/imdario/mergo v0.3.9 h1:UauaLniWCFHWd+Jp9oCEkTBj8VO/9DKg3PV3VCNMDIg=
 github.com/imdario/mergo v0.3.9/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
+github.com/imdario/mergo v0.3.10 h1:6q5mVkdH/vYmqngx7kZQTjJ5HRsx+ImorDIEQ+beJgc=
+github.com/imdario/mergo v0.3.10/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 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=
@@ -55,6 +57,8 @@ github.com/onsi/gomega v1.10.1 h1:o0+MgICZLuZ7xjH7Vx6zS/zcu93/BEp1VwkIW1mEXCE=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/paketo-buildpacks/libpak v1.38.0 h1:kzvONCQySmthbiwORiy9F6wxGMGk+dgV1KOp677L5PE=
 github.com/paketo-buildpacks/libpak v1.38.0/go.mod h1:JUx7gJUOJLjchYmsoWMEEM5UULzwdybF101eg8eDD+E=
+github.com/paketo-buildpacks/libpak v1.39.0 h1:oY9ChX4G1xAneIat7pBXsHgX/qWxlvjdY96b6/22qMo=
+github.com/paketo-buildpacks/libpak v1.39.0/go.mod h1:ocnHm9a5NTeKS34FUC57HSVImrWzTqZDCmZEPN0Q2Ps=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rakyll/statik v0.1.7 h1:OF3QCZUuyPxuGEP7B4ypUa7sB/iHtqOTDYZXGM8KOdQ=
@@ -65,6 +69,8 @@ github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.2.0 h1:Hbg2NidpLE8veEBkEZTL3CvlkUIVzuU9jDplZO54c48=
 github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/objx v0.3.0 h1:NGXK3lHquSN08v5vWalVI/L8XU9hdzE/G6xsrze47As=
+github.com/stretchr/objx v0.3.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -85,6 +91,8 @@ golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae h1:Ih9Yo4hSPImZOpfGuA4bR/ORKTAbhZo2AbWNRCnevdo=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c h1:UIcGWL6/wpCfyGuJnRFJRurA+yj8RrW7Q6x2YMCXt6c=
+golang.org/x/sys v0.0.0-20200724161237-0e2f3a69832c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=

stackdriver/build.go

@@ -44,7 +44,10 @@ func (b Build) Build(context libcnb.BuildContext) (libcnb.BuildResult, error) {
 		return libcnb.BuildResult{}, fmt.Errorf("unable to create dependency resolver\n%w", err)
 	}
 
-	dc := libpak.NewDependencyCache(context.Buildpack)
+	dc, err := libpak.NewDependencyCache(context)
+	if err != nil {
+		return libcnb.BuildResult{}, fmt.Errorf("unable to create dependency cache\n%w", err)
+	}
 	dc.Logger = b.Logger
 
 	if _, ok, err := pr.Resolve("google-stackdriver-debugger-java"); err != nil {