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vfs: fix failed to _ensure cache internal error: downloaders is nil error

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This error was caused by renaming an open file.

When the file was renamed in the cache, the downloaders were cleared,
however the downloaders were not re-opened when needed again, instead
this error was generated.

This fix re-opens the downloaders if they have been closed by renaming
the file.

Fixes #5984
This commit is contained in:
Nick Craig-Wood 2022-02-18 16:23:26 +00:00
parent 2339172df2
commit ec72432cec
1 changed files with 4 additions and 1 deletions
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5
vfs/vfscache/item.go
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@ -1128,7 +1128,10 @@ func (item *Item) _ensure(offset, size int64) (err error) {
return item.downloaders.EnsureDownloader(r)
}
if item.downloaders == nil {
return errors.New("internal error: downloaders is nil")
// Downloaders can be nil here if the file has been
// renamed, so need to make some more downloaders
// OK to call downloaders constructor with item.mu held
item.downloaders = downloaders.New(item, item.c.opt, item.name, item.o)
}
return item.downloaders.Download(r)
}