cli: add windows amd64 build target (#1835)

cli/internal/cmd/miniup_linux_amd64.go

@@ -0,0 +1,87 @@
+//go:build linux && amd64
+
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package cmd
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"runtime"
+	"strings"
+
+	"golang.org/x/sys/unix"
+)
+
+// checkSystemRequirements checks if the system meets the requirements for running a MiniConstellation cluster.
+// We do so by verifying that the host:
+// - arch/os is linux/amd64.
+// - has access to /dev/kvm.
+// - has at least 4 CPU cores.
+// - has at least 4GB of memory.
+// - has at least 20GB of free disk space.
+func (m *miniUpCmd) checkSystemRequirements(out io.Writer) error {
+	// check arch/os
+	if runtime.GOARCH != "amd64" || runtime.GOOS != "linux" {
+		return fmt.Errorf("creation of a QEMU based Constellation is not supported for %s/%s, a linux/amd64 platform is required", runtime.GOOS, runtime.GOARCH)
+	}
+
+	m.log.Debugf("Checked arch and os")
+	// check if /dev/kvm exists
+	if _, err := os.Stat("/dev/kvm"); err != nil {
+		return fmt.Errorf("unable to access KVM device: %w", err)
+	}
+	m.log.Debugf("Checked that /dev/kvm exists")
+	// check CPU cores
+	if runtime.NumCPU() < 4 {
+		return fmt.Errorf("insufficient CPU cores: %d, at least 4 cores are required by MiniConstellation", runtime.NumCPU())
+	}
+	if runtime.NumCPU() < 6 {
+		fmt.Fprintf(out, "WARNING: Only %d CPU cores available. This may cause performance issues.\n", runtime.NumCPU())
+	}
+	m.log.Debugf("Checked CPU cores - there are %d", runtime.NumCPU())
+
+	// check memory
+	f, err := os.Open("/proc/meminfo")
+	if err != nil {
+		return fmt.Errorf("determining available memory: failed to open /proc/meminfo: %w", err)
+	}
+	defer f.Close()
+	var memKB int
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		if strings.HasPrefix(scanner.Text(), "MemTotal:") {
+			_, err = fmt.Sscanf(scanner.Text(), "MemTotal:%d", &memKB)
+			if err != nil {
+				return fmt.Errorf("determining available memory: failed to parse /proc/meminfo: %w", err)
+			}
+		}
+	}
+	m.log.Debugf("Scanned for available memory")
+	memGB := memKB / 1024 / 1024
+	if memGB < 4 {
+		return fmt.Errorf("insufficient memory: %dGB, at least 4GB of memory are required by MiniConstellation", memGB)
+	}
+	if memGB < 6 {
+		fmt.Fprintln(out, "WARNING: Less than 6GB of memory available. This may cause performance issues.")
+	}
+	m.log.Debugf("Checked available memory, you have %dGB available", memGB)
+
+	var stat unix.Statfs_t
+	if err := unix.Statfs(".", &stat); err != nil {
+		return err
+	}
+	freeSpaceGB := stat.Bavail * uint64(stat.Bsize) / 1024 / 1024 / 1024
+	if freeSpaceGB < 20 {
+		return fmt.Errorf("insufficient disk space: %dGB, at least 20GB of disk space are required by MiniConstellation", freeSpaceGB)
+	}
+	m.log.Debugf("Checked for free space available, you have %dGB available", freeSpaceGB)
+
+	return nil
+}