#!/usr/bin/env sh
set -eu

: "${CGO_ENABLED=}"
: "${GO_LINKMODE=static}"
: "${GO_BUILDMODE=}"
: "${GO_BUILDTAGS=}"
: "${GO_STRIP=}"

TARGET=${TARGET:-"build"}

PLATFORM=${PLATFORM:-}
VERSION=${VERSION:-$(git describe --match 'v[0-9]*' --dirty='.m' --always --tags | sed 's/^v//' 2>/dev/null || echo "unknown-version" )}
GITCOMMIT=${GITCOMMIT:-$(git rev-parse --short HEAD 2> /dev/null || true)}

if [ "$(uname)" = "Darwin" ]; then
    # Using BSD date (macOS), which doesn't suppoort the --date option
    # date -jf "<input format>" "<input value>" +"<output format>" (https://unix.stackexchange.com/a/86510)
    BUILDTIME=${BUILDTIME:-$(TZ=UTC date -jf "%s" "${SOURCE_DATE_EPOCH:-$(date +%s)}" +"%Y-%m-%dT%H:%M:%SZ")}
else
    # Using GNU date (Linux)
    BUILDTIME=${BUILDTIME:-$(TZ=UTC date -u --date="@${SOURCE_DATE_EPOCH:-$(date +%s)}" +"%Y-%m-%dT%H:%M:%SZ")}
fi

case "$VERSION" in
	refs/tags/v*) VERSION=${VERSION#refs/tags/v} ;;
	refs/tags/*) VERSION=${VERSION#refs/tags/} ;;
	refs/heads/*) VERSION=$(echo "${VERSION#refs/heads/}" | sed -r 's#/+#-#g') ;;
	refs/pull/*) VERSION=pr-$(echo "$VERSION" | grep -o '[0-9]\+') ;;
esac

GOOS="$(go env GOOS)"
GOARCH="$(go env GOARCH)"
if [ "${GOARCH}" = "arm" ]; then
    GOARM="$(go env GOARM)"
fi

TARGET="$TARGET/docker-${GOOS}-${GOARCH}"
if [ "${GOARCH}" = "arm" ] && [ -n "${GOARM}" ]; then
    TARGET="${TARGET}-v${GOARM}"
fi
if [ "${GOOS}" = "windows" ]; then
    TARGET="${TARGET}.exe"
fi
export TARGET

# No CGO when cross building to darwin
if [ "$(go env GOOS)" = "darwin" ] && [ "$(uname)" != "Darwin" ]; then
    if [ -z "$CGO_ENABLED" ]; then
        CGO_ENABLED=0
    elif [ "$CGO_ENABLED" = "1" ]; then
        echo "CGO_ENABLED=1 not supported when cross-compiling for Darwin"
        exit 1
    fi
fi

if [ -z "$CGO_ENABLED" ]; then
    case "$(go env GOOS)" in
        linux)
            case "$(go env GOARCH)" in
                amd64|arm64|arm|s390x|riscv64|loong64)
                    CGO_ENABLED=1
                ;;
                *)
                    CGO_ENABLED=0
                ;;
            esac
        ;;
        darwin|windows)
            CGO_ENABLED=1
        ;;
        *)
            CGO_ENABLED=0
        ;;
    esac
fi
export CGO_ENABLED

if [ "$CGO_ENABLED" = "1" ] && [ "$(go env GOOS)" != "windows" ]; then
    case "$(go env GOARCH)" in
        mips*|ppc64)
            # pie build mode is not supported on mips architectures
            ;;
        *)
            GO_BUILDMODE="-buildmode=pie"
            ;;
    esac
fi
export GO_BUILDMODE

GO_LDFLAGS="${GO_LDFLAGS:-}"
GO_LDFLAGS="$GO_LDFLAGS -X \"github.com/docker/cli/cli/version.GitCommit=${GITCOMMIT}\""
GO_LDFLAGS="$GO_LDFLAGS -X \"github.com/docker/cli/cli/version.BuildTime=${BUILDTIME}\""
GO_LDFLAGS="$GO_LDFLAGS -X \"github.com/docker/cli/cli/version.Version=${VERSION}\""
if test -n "${PLATFORM}"; then
    GO_LDFLAGS="$GO_LDFLAGS -X \"github.com/docker/cli/cli/version.PlatformName=${PLATFORM}\""
fi
if [ "$CGO_ENABLED" = "1" ] && [ "$GO_LINKMODE" = "static" ] && [ "$(go env GOOS)" = "linux" ]; then
    GO_LDFLAGS="$GO_LDFLAGS -linkmode external -extldflags -static"
fi
if [ "$CGO_ENABLED" = "1" ] && [ "$GO_LINKMODE" = "static" ]; then
    # compiling statically with CGO enabled requires osusergo and netgo to be set.
    GO_BUILDTAGS="$GO_BUILDTAGS osusergo netgo"
fi
# XXX: Disable netgo on Windows and use Windows system resolver instead.
#
# go1.19 and newer added support for netgo on Windows (https://go.dev/doc/go1.19#net),
# which may not respect VPN adaptors (such as Twingate) due to resolver ordering,
# resulting in queries being sent through the local network adapter instead of the
# VPN tunnel. See https://github.com/docker/cli/issues/6665
if [ "$(go env GOOS)" = "windows" ]; then
    GO_BUILDTAGS=$(echo "$GO_BUILDTAGS" | sed 's/\(^\| \)netgo\( \|$\)/\1/g')
fi
if [ -n "$GO_STRIP" ]; then
    # if stripping enabled and building with llvm < 12 against darwin/amd64
    # platform, it will fail with:
    #  # github.com/docker/cli/cmd/docker
    #  /usr/local/go/pkg/tool/linux_amd64/link: /usr/local/go/pkg/tool/linux_amd64/link: running strip failed: exit status 1
    #  llvm-strip: error: unsupported load command (cmd=0x5)
    # more info: https://github.com/docker/cli/pull/3717
    GO_LDFLAGS="$GO_LDFLAGS -s -w"
fi
export GO_LDFLAGS="$GO_LDFLAGS" # https://github.com/koalaman/shellcheck/issues/2064

export SOURCE="github.com/docker/cli/cmd/docker"
