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Backport #29298 Fixes the reason why #29101 is hard to replicate. Related #29297 Create a repo with a file with minimum size 4097 bytes (I use 10000) and execute the following code: ```go gitRepo, err := gitrepo.OpenRepository(db.DefaultContext, <repo>) assert.NoError(t, err) commit, err := gitRepo.GetCommit(<sha>) assert.NoError(t, err) entry, err := commit.GetTreeEntryByPath(<file>) assert.NoError(t, err) b := entry.Blob() // Create a reader r, err := b.DataAsync() assert.NoError(t, err) defer r.Close() // Create a second reader r2, err := b.DataAsync() assert.NoError(t, err) // Should be no error but is ErrNotExist defer r2.Close() ``` The problem is the check in `CatFileBatch`: https://github.com/go-gitea/gitea/blob/79217ea63c1f77de7ca79813ae45950724e63d02/modules/git/repo_base_nogogit.go#L81-L87 `Buffered() > 0` is used to check if there is a "operation" in progress at the moment. This is a problem because we can't control the internal buffer in the `bufio.Reader`. The code above demonstrates a sequence which initiates an operation for which the code thinks there is no active processing. The second call to `DataAsync()` therefore reuses the existing instances instead of creating a new batch reader.
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