Add progress bar to example program

Most users will want to integrate a progress bar and this serve as a
good example of how to do this. This also makes it more fun to work on
this project.

Ubuntu 24.04 image in qcow2 compressed format:

    % ./go-qcow2reader-example convert /var/tmp/images/test.zlib.qcow2 /tmp/tmp.img
    6.00 GiB / 6.00 GiB [-------------------------------------] 100.00% 2.86 GiB p/s

Ubuntu 24.04 image in qcow2 format:

    % ./go-qcow2reader-example convert /var/tmp/images/test.qcow2 /tmp/tmp.img
    6.00 GiB / 6.00 GiB [------------------------------------] 100.00% 15.73 GiB p/s

16 TiB empty qcow2 image:

    % ./go-qcow2reader-example convert /var/tmp/images/test.0p.qcow2 /tmp/tmp.img
    16.00 TiB / 16.00 TiB [---------------------------------] 100.00% 152.46 TiB p/s

The pb module brings too many dependencies. Maybe we can find another
library or write a very simple progress instead.

Signed-off-by: Nir Soffer <[email protected]>

Author: nirs

cmd/go-qcow2reader-example/convert.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/cheggaaa/pb/v3"
 	"github.com/lima-vm/go-qcow2reader"
 	"github.com/lima-vm/go-qcow2reader/convert"
 	"github.com/lima-vm/go-qcow2reader/log"
@@ -76,7 +77,12 @@ func cmdConvert(args []string) error {
 	if err != nil {
 		return err
 	}
-	if err := c.Convert(t, img, img.Size(), nil); err != nil {
+
+	bar := newProgressBar(img.Size())
+	bar.Start()
+	defer bar.Finish()
+
+	if err := c.Convert(t, img, img.Size(), bar); err != nil {
 		return err
 	}
 
@@ -86,3 +92,18 @@ func cmdConvert(args []string) error {
 
 	return t.Close()
 }
+
+// progressBar adapts pb.ProgressBar to the Updater interface.
+type progressBar struct {
+	*pb.ProgressBar
+}
+
+func newProgressBar(size int64) *progressBar {
+	b := &progressBar{pb.New64(size)}
+	b.Set(pb.Bytes, true)
+	return b
+}
+
+func (b *progressBar) Update(n int64) {
+	b.ProgressBar.Add64(n)
+}

cmd/go-qcow2reader-example/go.mod

@@ -3,8 +3,19 @@ module github.com/lima-vm/go-qcow2reader/cmd/go-qcow2reader-example
 go 1.22
 
 require (
+	github.com/cheggaaa/pb/v3 v3.1.5
 	github.com/klauspost/compress v1.16.5
 	github.com/lima-vm/go-qcow2reader v0.0.0-00010101000000-000000000000
 )
 
+require (
+	github.com/VividCortex/ewma v1.2.0 // indirect
+	github.com/fatih/color v1.15.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
+	github.com/mattn/go-runewidth v0.0.15 // indirect
+	github.com/rivo/uniseg v0.2.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+)
+
 replace github.com/lima-vm/go-qcow2reader => ../../

cmd/go-qcow2reader-example/go.sum

@@ -1,2 +1,20 @@
+github.com/VividCortex/ewma v1.2.0 h1:f58SaIzcDXrSy3kWaHNvuJgJ3Nmz59Zji6XoJR/q1ow=
+github.com/VividCortex/ewma v1.2.0/go.mod h1:nz4BbCtbLyFDeC9SUHbtcT5644juEuWfUAUnGx7j5l4=
+github.com/cheggaaa/pb/v3 v3.1.5 h1:QuuUzeM2WsAqG2gMqtzaWithDJv0i+i6UlnwSCI4QLk=
+github.com/cheggaaa/pb/v3 v3.1.5/go.mod h1:CrxkeghYTXi1lQBEI7jSn+3svI3cuc19haAj6jM60XI=
+github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
+github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
 github.com/klauspost/compress v1.16.5 h1:IFV2oUNUzZaz+XyusxpLzpzS8Pt5rh0Z16For/djlyI=
 github.com/klauspost/compress v1.16.5/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
+github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
+github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
+github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=