Upgrade libgit2 to libgit2-1.3.0-1

Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>

Dockerfile

@@ -3,7 +3,7 @@ ARG GO_VERSION=1.17
 ARG XX_VERSION=1.1.0
 
 ARG LIBGIT2_IMG=ghcr.io/fluxcd/golang-with-libgit2
-ARG LIBGIT2_TAG=libgit2-1.1.1-6
+ARG LIBGIT2_TAG=libgit2-1.3.0-1
 
 FROM ${LIBGIT2_IMG}:${LIBGIT2_TAG} AS libgit2-libs
 

Makefile

@@ -4,7 +4,7 @@ TAG ?= latest
 
 # Base image used to build the Go binary
 LIBGIT2_IMG ?= ghcr.io/fluxcd/golang-with-libgit2
-LIBGIT2_TAG ?= libgit2-1.1.1-6
+LIBGIT2_TAG ?= libgit2-1.3.0-1
 
 # Allows for defining additional Docker buildx arguments,
 # e.g. '--push'.
@@ -208,6 +208,12 @@ ifneq ($(shell grep -o 'LIBGIT2_IMG ?= \w.*' Makefile | cut -d ' ' -f 3):$(shell
 	exit 1; \
 	}
 endif
+ifneq ($(shell grep -o 'LIBGIT2_TAG ?= \w.*' Makefile | cut -d ' ' -f 3), $(shell grep -o "libgit2-.*" tests/fuzz/oss_fuzz_build.sh | cut -d'}' -f1))
+	@{ \
+	echo "LIBGIT2_TAG must match in both Makefile and tests/fuzz/oss_fuzz_build.sh"; \
+	exit 1; \
+	}
+endif
 ifneq (, $(shell git status --porcelain --untracked-files=no))
 	@{ \
 	echo "working directory is dirty:"; \

hack/install-libraries.sh

@@ -45,8 +45,6 @@ function setup_current() {
     mkdir -p "./build/libgit2"
     if [[ $OSTYPE == 'darwin'* ]]; then
         # For MacOS development environments, download the amd64 static libraries released from from golang-with-libgit2.
-
-        #TODO: update URL with official URL + TAG:
         curl -o output.tar.gz -LO "https://github.com/fluxcd/golang-with-libgit2/releases/download/${TAG}/darwin-libs.tar.gz"
 
         DIR=libgit2-darwin

pkg/git/libgit2/checkout_test.go

@@ -26,12 +26,13 @@ import (
 	"testing"
 	"time"
 
-	"github.com/fluxcd/pkg/gittestserver"
-	"github.com/fluxcd/pkg/ssh"
 	git2go "github.com/libgit2/git2go/v33"
 	. "github.com/onsi/gomega"
 	corev1 "k8s.io/api/core/v1"
 
+	"github.com/fluxcd/pkg/gittestserver"
+	"github.com/fluxcd/pkg/ssh"
+
 	"github.com/fluxcd/source-controller/pkg/git"
 )
 

pkg/git/libgit2/transport.go

@@ -68,7 +68,7 @@ func transferProgressCallback(ctx context.Context) git2go.TransferProgressCallba
 		}
 		select {
 		case <-ctx.Done():
-			return fmt.Errorf("transport close - potentially due to a timeout")
+			return fmt.Errorf("transport close (potentially due to a timeout)")
 		default:
 			return nil
 		}
@@ -158,7 +158,7 @@ func x509Callback(caBundle []byte) git2go.CertificateCheckCallback {
 	return func(cert *git2go.Certificate, valid bool, hostname string) error {
 		roots := x509.NewCertPool()
 		if ok := roots.AppendCertsFromPEM(caBundle); !ok {
-			return fmt.Errorf("x509 cert could not be appended")
+			return fmt.Errorf("PEM CA bundle could not be appended to x509 cert pool")
 		}
 
 		opts := x509.VerifyOptions{
@@ -167,7 +167,7 @@ func x509Callback(caBundle []byte) git2go.CertificateCheckCallback {
 			CurrentTime: now(),
 		}
 		if _, err := cert.X509.Verify(opts); err != nil {
-			return fmt.Errorf("x509 cert could not be verified")
+			return fmt.Errorf("x509 cert could not be verified: %w", err)
 		}
 		return nil
 	}
@@ -200,7 +200,7 @@ func knownHostsCallback(host string, knownHosts []byte) git2go.CertificateCheckC
 		}
 
 		if hostnameWithoutPort != hostWithoutPort {
-			return fmt.Errorf("host mismatch: %q %q\n", hostWithoutPort, hostnameWithoutPort)
+			return fmt.Errorf("host mismatch: %q %q", hostWithoutPort, hostnameWithoutPort)
 		}
 
 		// We are now certain that the configured host and the hostname

pkg/git/libgit2/transport_test.go

@@ -159,28 +159,28 @@ func Test_x509Callback(t *testing.T) {
 			certificate: googleLeafWithInvalidHashFixture,
 			host:        "www.google.com",
 			caBundle:    []byte(giag2IntermediateFixture + "\n" + geoTrustRootFixture),
-			want:        fmt.Errorf("x509 cert could not be verified"),
+			want:        fmt.Errorf(`x509 cert could not be verified: x509: certificate signed by unknown authority (possibly because of "x509: cannot verify signature: algorithm unimplemented" while trying to verify candidate authority certificate "Google Internet Authority G2")`),
 		},
 		{
 			name:        "Invalid certificate authority bundle",
 			certificate: googleLeafFixture,
 			host:        "www.google.com",
 			caBundle:    bytes.Trim([]byte(giag2IntermediateFixture+"\n"+geoTrustRootFixture), "-"),
-			want:        fmt.Errorf("x509 cert could not be appended"),
+			want:        fmt.Errorf("PEM CA bundle could not be appended to x509 cert pool"),
 		},
 		{
 			name:        "Missing intermediate in bundle",
 			certificate: googleLeafFixture,
 			host:        "www.google.com",
 			caBundle:    []byte(geoTrustRootFixture),
-			want:        fmt.Errorf("x509 cert could not be verified"),
+			want:        fmt.Errorf("x509 cert could not be verified: x509: certificate signed by unknown authority"),
 		},
 		{
 			name:        "Invalid host",
 			certificate: googleLeafFixture,
 			host:        "www.google.co",
 			caBundle:    []byte(giag2IntermediateFixture + "\n" + geoTrustRootFixture),
-			want:        fmt.Errorf("x509 cert could not be verified"),
+			want:        fmt.Errorf("x509 cert could not be verified: x509: certificate is valid for www.google.com, not www.google.co"),
 		},
 	}
 	for _, tt := range tests {
@@ -195,11 +195,11 @@ func Test_x509Callback(t *testing.T) {
 			}
 
 			callback := x509Callback(tt.caBundle)
-			result := g.Expect(callback(cert, false, tt.host))
+			result := callback(cert, false, tt.host)
 			if tt.want == nil {
-				result.To(BeNil())
+				g.Expect(result).To(BeNil())
 			} else {
-				result.To(Equal(tt.want))
+				g.Expect(result.Error()).To(Equal(tt.want.Error()))
 			}
 		})
 	}
@@ -236,7 +236,7 @@ func Test_knownHostsCallback(t *testing.T) {
 			knownHosts:   []byte(knownHostsFixture),
 			hostkey:      git2go.HostkeyCertificate{Kind: git2go.HostkeySHA1 | git2go.HostkeyMD5, HashSHA1: sha1Fingerprint("v2toJdKXfFEaR1u++4iq1UqSrHM")},
 			expectedHost: "example.com",
-			want:         fmt.Errorf("host mismatch: %q %q\n", "example.com", "github.com"),
+			want:         fmt.Errorf("host mismatch: %q %q", "example.com", "github.com"),
 		},
 		{
 			name:         "Hostkey mismatch",
@@ -399,7 +399,7 @@ func Test_transferProgressCallback(t *testing.T) {
 				ReceivedObjects: 21,
 			},
 			cancelFunc: func(cf context.CancelFunc) { cf() },
-			wantErr:    fmt.Errorf("transport close - potentially due to a timeout"),
+			wantErr:    fmt.Errorf("transport close (potentially due to a timeout)"),
 		},
 	}
 

tests/fuzz/oss_fuzz_build.sh

@@ -16,7 +16,7 @@
 
 set -euxo pipefail
 
-LIBGIT2_TAG="${LIBGIT2_TAG:-libgit2-1.1.1-6}"
+LIBGIT2_TAG="${LIBGIT2_TAG:-libgit2-1.3.0-1}"
 GOPATH="${GOPATH:-/root/go}"
 GO_SRC="${GOPATH}/src"
 PROJECT_PATH="github.com/fluxcd/source-controller"
@@ -34,19 +34,35 @@ export PKG_CONFIG_PATH="${TARGET_DIR}/lib/pkgconfig:${TARGET_DIR}/lib64/pkgconfi
 export CGO_CFLAGS="-I${TARGET_DIR}/include -I${TARGET_DIR}/include/openssl"
 export CGO_LDFLAGS="$(pkg-config --libs --static --cflags libssh2 openssl libgit2)"
 
-go mod tidy -compat=1.17
+go mod tidy
+
+# The implementation of libgit2 is sensitive to the versions of git2go.
+# Leaving it to its own devices, the minimum version of git2go used may not
+# be compatible with the currently implemented version. Hence the modifications
+# of the existing go.mod. 
+sed "s;\./api;$(/bin/pwd)/api;g" go.mod > tests/fuzz/go.mod
+sed -i 's;module github.com/fluxcd/source-controller;module github.com/fluxcd/source-controller/tests/fuzz;g' tests/fuzz/go.mod
+echo "replace github.com/fluxcd/source-controller => $(/bin/pwd)/" >> tests/fuzz/go.mod
+
+cp go.sum tests/fuzz/go.sum
 
 popd
 
 pushd "${PROJECT_PATH}/tests/fuzz"
 
+go mod download
+
+go get -d github.com/AdaLogics/go-fuzz-headers
+go get -d github.com/fluxcd/source-controller
+
 # Setup files to be embedded into controllers_fuzzer.go's testFiles variable.
 mkdir -p testdata/crd
 cp ../../config/crd/bases/*.yaml testdata/crd/
 cp -r ../../controllers/testdata/certs testdata/
 
-go mod tidy -compat=1.17
-
+# In order to manually link the statically libraries use go-fuzz and clang manually
+# instead of using the compile_go_fuzzer wrapper.
+#
 # ref: https://github.com/google/oss-fuzz/blob/master/infra/base-images/base-builder/compile_go_fuzzer
 go-fuzz -tags gofuzz -func=FuzzRandomGitFiles -o gitrepository_fuzzer.a .
 clang -o /out/fuzz_random_git_files \
@@ -69,6 +85,7 @@ clang -o /out/fuzz_git_resource_object \
     -fsanitize=fuzzer
 
 # By now testdata is embedded in the binaries and no longer needed.
+# Remove them given that inside the container this is run as root.
 rm -rf testdata/
 
 popd