Dockerfile for cross compilation

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.dockerignore

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+/bin
+/release

.gitignore

@@ -1,2 +1,2 @@
-bin
+/bin
-release
+/release

Dockerfile

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+# syntax=docker/dockerfile:1
+
+ARG GO_VERSION=1.16.7
+ARG XX_VERSION=1.1.2
+ARG OSXCROSS_VERSION=11.3-r7-alpine
+
+ARG PKG=github.com/docker/docker-credential-helpers
+
+# xx is a helper for cross-compilation
+FROM --platform=$BUILDPLATFORM tonistiigi/xx:${XX_VERSION} AS xx
+
+# osxcross contains the MacOSX cross toolchain for xx
+FROM crazymax/osxcross:${OSXCROSS_VERSION} AS osxcross
+
+FROM --platform=$BUILDPLATFORM golang:${GO_VERSION}-alpine AS gobase
+COPY --from=xx / /
+RUN apk add --no-cache clang file git lld llvm pkgconf
+ENV GOFLAGS="-mod=vendor"
+ENV CGO_ENABLED="1"
+WORKDIR /src
+
+FROM gobase AS version
+ARG PKG
+RUN --mount=target=. \
+    VERSION=$(git describe --match 'v[0-9]*' --dirty='.m' --always --tags); \
+    echo "-s -w -X ${PKG}/credentials.Version=${VERSION}" | tee /tmp/.ldflags; \
+    echo -n "${VERSION}" | tee /tmp/.version;
+
+FROM gobase AS base
+ARG TARGETPLATFORM
+RUN xx-apk add musl-dev gcc libsecret-dev pass
+
+FROM base AS build-linux
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETVARIANT
+RUN --mount=type=bind,target=. \
+    --mount=type=cache,target=/root/.cache \
+    --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=bind,from=version,source=/tmp/.ldflags,target=/tmp/.ldflags <<EOT
+  set -ex
+  mkdir /out
+  xx-go build -ldflags "$(cat /tmp/.ldflags)" -o /out/docker-credential-pass-${TARGETOS}-${TARGETARCH}${TARGETVARIANT} ./pass/cmd/main.go
+  xx-verify /out/docker-credential-pass-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}
+  xx-go build -ldflags "$(cat /tmp/.ldflags)" -o /out/docker-credential-secretservice-${TARGETOS}-${TARGETARCH}${TARGETVARIANT} ./secretservice/cmd/main_linux.go
+  xx-verify /out/docker-credential-secretservice-${TARGETOS}-${TARGETARCH}${TARGETVARIANT}
+EOT
+
+FROM base AS build-darwin
+ARG TARGETARCH
+ARG TARGETVARIANT
+RUN --mount=type=bind,target=. \
+    --mount=type=cache,target=/root/.cache \
+    --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=bind,from=osxcross,src=/osxsdk,target=/xx-sdk \
+    --mount=type=bind,from=version,source=/tmp/.ldflags,target=/tmp/.ldflags <<EOT
+  set -ex
+  mkdir /out
+  xx-go install std
+  xx-go build -ldflags "$(cat /tmp/.ldflags)" -o /out/docker-credential-osxkeychain-${TARGETARCH}${TARGETVARIANT} ./osxkeychain/cmd/main_darwin.go
+  xx-verify /out/docker-credential-osxkeychain-${TARGETARCH}${TARGETVARIANT}
+EOT
+
+FROM base AS build-windows
+ARG TARGETARCH
+ARG TARGETVARIANT
+RUN --mount=type=bind,target=. \
+    --mount=type=cache,target=/root/.cache \
+    --mount=type=cache,target=/go/pkg/mod \
+    --mount=type=bind,from=version,source=/tmp/.ldflags,target=/tmp/.ldflags <<EOT
+  set -ex
+  mkdir /out
+  xx-go build -ldflags "$(cat /tmp/.ldflags)" -o /out/docker-credential-wincred-${TARGETARCH}${TARGETVARIANT}.exe ./wincred/cmd/main_windows.go
+  xx-verify /out/docker-credential-wincred-${TARGETARCH}${TARGETVARIANT}.exe
+EOT
+
+FROM build-$TARGETOS AS build
+
+FROM scratch AS binaries
+COPY --from=build /out /

docker-bake.hcl

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+variable "GO_VERSION" {
+  default = "1.16.7"
+}
+variable "DESTDIR" {
+  default = "./bin"
+}
+
+target "_common" {
+  args = {
+    GO_VERSION = GO_VERSION
+  }
+}
+
+group "default" {
+  targets = ["binaries"]
+}
+
+target "binaries" {
+  inherits = ["_common"]
+  target = "binaries"
+  output = [DESTDIR]
+  platforms = [
+    "darwin/amd64",
+    "darwin/arm64",
+    "linux/amd64",
+    "linux/arm64",
+    "linux/arm/v7",
+    "linux/arm/v6",
+    "windows/amd64"
+  ]
+}