commands: add prune command

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

commands/diskusage.go

@@ -0,0 +1,98 @@
+package commands
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"text/tabwriter"
+
+	"github.com/moby/buildkit/client"
+	"github.com/tonistiigi/units"
+)
+
+func printKV(w io.Writer, k string, v interface{}) {
+	fmt.Fprintf(w, "%s:\t%v\n", k, v)
+}
+
+func printVerbose(tw *tabwriter.Writer, du []*client.UsageInfo) {
+	for _, di := range du {
+		printKV(tw, "ID", di.ID)
+		if di.Parent != "" {
+			printKV(tw, "Parent", di.Parent)
+		}
+		printKV(tw, "Created at", di.CreatedAt)
+		printKV(tw, "Mutable", di.Mutable)
+		printKV(tw, "Reclaimable", !di.InUse)
+		printKV(tw, "Shared", di.Shared)
+		printKV(tw, "Size", fmt.Sprintf("%.2f", units.Bytes(di.Size)))
+		if di.Description != "" {
+			printKV(tw, "Description", di.Description)
+		}
+		printKV(tw, "Usage count", di.UsageCount)
+		if di.LastUsedAt != nil {
+			printKV(tw, "Last used", di.LastUsedAt)
+		}
+		if di.RecordType != "" {
+			printKV(tw, "Type", di.RecordType)
+		}
+
+		fmt.Fprintf(tw, "\n")
+	}
+
+	tw.Flush()
+}
+
+func printTable(tw *tabwriter.Writer, du []*client.UsageInfo) {
+	printTableHeader(tw)
+
+	for _, di := range du {
+		printTableRow(tw, di)
+	}
+
+	tw.Flush()
+}
+
+func printTableHeader(tw *tabwriter.Writer) {
+	fmt.Fprintln(tw, "ID\tRECLAIMABLE\tSIZE\tLAST ACCESSED")
+}
+
+func printTableRow(tw *tabwriter.Writer, di *client.UsageInfo) {
+	id := di.ID
+	if di.Mutable {
+		id += "*"
+	}
+	size := fmt.Sprintf("%.2f", units.Bytes(di.Size))
+	if di.Shared {
+		size += "*"
+	}
+	fmt.Fprintf(tw, "%-71s\t%-11v\t%s\t\n", id, !di.InUse, size)
+}
+
+func printSummary(tw *tabwriter.Writer, du []*client.UsageInfo) {
+	total := int64(0)
+	reclaimable := int64(0)
+	shared := int64(0)
+
+	for _, di := range du {
+		if di.Size > 0 {
+			total += di.Size
+			if !di.InUse {
+				reclaimable += di.Size
+			}
+		}
+		if di.Shared {
+			shared += di.Size
+		}
+	}
+
+	tw = tabwriter.NewWriter(os.Stdout, 1, 8, 1, '\t', 0)
+
+	if shared > 0 {
+		fmt.Fprintf(tw, "Shared:\t%.2f\n", units.Bytes(shared))
+		fmt.Fprintf(tw, "Private:\t%.2f\n", units.Bytes(total-shared))
+	}
+
+	fmt.Fprintf(tw, "Reclaimable:\t%.2f\n", units.Bytes(reclaimable))
+	fmt.Fprintf(tw, "Total:\t%.2f\n", units.Bytes(total))
+	tw.Flush()
+}