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Fix panic when the prefix is > 61 chars #182

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Feb 26, 2016
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Fix panic when the prefix is > 61 chars #182

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7 changes: 7 additions & 0 deletions registry/fetch.go
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Original file line number Diff line number Diff line change
Expand Up @@ -414,7 +414,14 @@ func (r Registry) download(url, path, label string) error {
func newIoprogress(label string, size int64, rdr io.Reader) io.Reader {
prefix := "Downloading " + label
fmtBytesSize := 18

// if barSize < 2, drawing the bar will panic; 3 will at least give a spinny
// thing.
barSize := int64(80 - len(prefix) - fmtBytesSize)
if barSize < 2 {
barSize = 2
}

bar := ioprogress.DrawTextFormatBarForW(barSize, os.Stderr)
fmtfunc := func(progress, total int64) string {
// Content-Length is set to -1 when unknown.
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