Merge pull request #31 from buildpacks/fix/warn-container-daemon

Warn if NOT --pull-policy=always in container

Author: Natalie Arellano

go.mod

@@ -2,6 +2,7 @@ module github.com/buildpacks/pack
 
 require (
 	github.com/BurntSushi/toml v1.3.2
+	github.com/GoogleContainerTools/kaniko v1.22.0
 	github.com/Masterminds/semver v1.5.0
 	github.com/Microsoft/go-winio v0.6.2
 	github.com/apex/log v1.9.0
@@ -108,7 +109,7 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/mitchellh/mapstructure v1.4.1 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/moby/buildkit v0.13.2 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
 	github.com/moby/patternmatcher v0.6.0 // indirect

go.sum

@@ -31,6 +31,8 @@ github.com/Azure/go-autorest/tracing v0.6.0 h1:TYi4+3m5t6K48TGI9AUdb+IzbnSxvnvUM
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8=
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/GoogleContainerTools/kaniko v1.22.0 h1:WIL8Wuc+lQW8sv1R+zOZsCy4lQtTzrVJ76K2VMkB++0=
+github.com/GoogleContainerTools/kaniko v1.22.0/go.mod h1:Kki7uX+HlskobmD7PRrGZvL0S9Aejf8kzfzoQUv68pQ=
 github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
 github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
@@ -272,8 +274,8 @@ github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/ioprogress v0.0.0-20180201004757-6a23b12fa88e h1:Qa6dnn8DlasdXRnacluu8HzPts0S1I9zvvUPDbBnXFI=
 github.com/mitchellh/ioprogress v0.0.0-20180201004757-6a23b12fa88e/go.mod h1:waEya8ee1Ro/lgxpVhkJI4BVASzkm3UZqkx/cFJiYHM=
-github.com/mitchellh/mapstructure v1.4.1 h1:CpVNEelQCZBooIPDn+AR3NpivK/TIKU8bDxdASFVQag=
-github.com/mitchellh/mapstructure v1.4.1/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
+github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/moby/buildkit v0.13.2 h1:nXNszM4qD9E7QtG7bFWPnDI1teUQFQglBzon/IU3SzI=
 github.com/moby/buildkit v0.13.2/go.mod h1:2cyVOv9NoHM7arphK9ZfHIWKn9YVZRFd1wXB8kKmEzY=
 github.com/moby/docker-image-spec v1.3.1 h1:jMKff3w6PgbfSa69GfNg+zN/XLhfXJGnEx3Nl2EsFP0=
@@ -533,8 +535,8 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/genproto v0.0.0-20240213162025-012b6fc9bca9 h1:9+tzLLstTlPTRyJTh+ah5wIMsBW5c4tQwGTN3thOW9Y=
-google.golang.org/genproto/googleapis/api v0.0.0-20231016165738-49dd2c1f3d0b h1:CIC2YMXmIhYw6evmhPxBKJ4fmLbOFtXQN/GV3XOZR8k=
-google.golang.org/genproto/googleapis/api v0.0.0-20231016165738-49dd2c1f3d0b/go.mod h1:IBQ646DjkDkvUIsVq/cc03FUFQ9wbZu7yE396YcL870=
+google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2 h1:rIo7ocm2roD9DcFIX67Ym8icoGCKSARAiPljFhh5suQ=
+google.golang.org/genproto/googleapis/api v0.0.0-20240311132316-a219d84964c2/go.mod h1:O1cOfN1Cy6QEYr7VxtjOyP5AdAuR0aJ/MYZaaof623Y=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c h1:lfpJ/2rWPa/kJgxyyXM8PrNnfCzcmxJ265mADgwmvLI=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c/go.mod h1:WtryC6hu0hhx87FDGxWCDptyssuo68sk10vYjF+T9fY=
 google.golang.org/grpc v1.62.1 h1:B4n+nfKzOICUXMgyrNd19h/I9oH0L1pizfk1d4zSgTk=
@@ -561,5 +563,5 @@ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gotest.tools/v3 v3.0.3 h1:4AuOwCGf4lLR9u3YOe2awrHygurzhO/HeQ6laiA6Sx0=
-gotest.tools/v3 v3.0.3/go.mod h1:Z7Lb0S5l+klDB31fvDQX8ss/FlKDxtlFlw3Oa8Ymbl8=
+gotest.tools/v3 v3.4.0 h1:ZazjZUfuVeZGLAmlKKuyv3IKP5orXcwtOwDQH6YVr6o=
+gotest.tools/v3 v3.4.0/go.mod h1:CtbdzLSsqVhDgMtKsx03ird5YTGB3ar27v0u/yKBW5g=

pkg/client/build.go

@@ -16,6 +16,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/GoogleContainerTools/kaniko/pkg/util/proc"
 	"github.com/Masterminds/semver"
 	"github.com/buildpacks/imgutil"
 	"github.com/buildpacks/imgutil/layout"
@@ -55,6 +56,10 @@ const (
 	minLifecycleVersionSupportingCreatorWithExtensions = "0.19.0"
 )
 
+var RunningInContainer = func() bool {
+	return proc.GetContainerRuntime(0, 0) != proc.RuntimeNotFound
+}
+
 // LifecycleExecutor executes the lifecycle which satisfies the Cloud Native Buildpacks Lifecycle specification.
 // Implementations of the Lifecycle must execute the following phases by calling the
 // phase-specific lifecycle binary in order:
@@ -284,6 +289,13 @@ type layoutPathConfig struct {
 func (c *Client) Build(ctx context.Context, opts BuildOptions) error {
 	var pathsConfig layoutPathConfig
 
+	if RunningInContainer() && !(opts.PullPolicy == image.PullAlways) {
+		c.logger.Warnf("Detected pack is running in a container; if using a shared docker host, failing to pull build inputs from a remote registry is insecure - " +
+			"other tenants may have compromised build inputs stored in the daemon." +
+			"This configuration is insecure and may become unsupported in the future." +
+			"Re-run with '--pull-policy=always' to silence this warning.")
+	}
+
 	imageRef, err := c.parseReference(opts)
 	if err != nil {
 		return errors.Wrapf(err, "invalid image name '%s'", opts.Image)

pkg/client/build_test.go

@@ -2379,6 +2379,38 @@ api = "0.2"
 				})
 			})
 
+			when("containerized pack", func() {
+				it.Before(func() {
+					RunningInContainer = func() bool {
+						return true
+					}
+				})
+
+				when("--pull-policy=always", func() {
+					it("does not warn", func() {
+						h.AssertNil(t, subject.Build(context.TODO(), BuildOptions{
+							Image:      "some/app",
+							Builder:    defaultBuilderName,
+							PullPolicy: image.PullAlways,
+						}))
+
+						h.AssertNotContains(t, outBuf.String(), "failing to pull build inputs from a remote registry is insecure")
+					})
+				})
+
+				when("not --pull-policy=always", func() {
+					it("warns", func() {
+						h.AssertNil(t, subject.Build(context.TODO(), BuildOptions{
+							Image:      "some/app",
+							Builder:    defaultBuilderName,
+							PullPolicy: image.PullNever,
+						}))
+
+						h.AssertContains(t, outBuf.String(), "failing to pull build inputs from a remote registry is insecure")
+					})
+				})
+			})
+
 			when("always", func() {
 				it("uses pulls the builder and run image before using them", func() {
 					h.AssertNil(t, subject.Build(context.TODO(), BuildOptions{