{"comment":{"url":"https://api.github.com/repos/Microsoft/docker/comments/16802346","html_url":"https://github.com/Microsoft/docker/commit/ac932c079e35f8f3459d9b63405431e6be71e2d8#commitcomment-16802346","id":16802346,"user":{"login":"swernli","id":10567287,"avatar_url":"https://avatars.githubusercontent.com/u/10567287?v=3","gravatar_id":"","url":"https://api.github.com/users/swernli","html_url":"https://github.com/swernli","followers_url":"https://api.github.com/users/swernli/followers","following_url":"https://api.github.com/users/swernli/following{/other_user}","gists_url":"https://api.github.com/users/swernli/gists{/gist_id}","starred_url":"https://api.github.com/users/swernli/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/swernli/subscriptions","organizations_url":"https://api.github.com/users/swernli/orgs","repos_url":"https://api.github.com/users/swernli/repos","events_url":"https://api.github.com/users/swernli/events{/privacy}","received_events_url":"https://api.github.com/users/swernli/received_events","type":"User","site_admin":false},"position":16,"line":260,"path":"daemon/graphdriver/windows/windows.go","commit_id":"ac932c079e35f8f3459d9b63405431e6be71e2d8","created_at":"2016-03-22T15:43:55Z","updated_at":"2016-03-22T15:43:55Z","body":"Well, I do like the idea that with the additional check you added we have the chance to give a more specific error message rather than some weird storage failure that may be much harder to find a root cause for.  This at least will tell us that some code is calling into TarStream without the layer mounted, which is a big step forward in fixing it.  I'd be in favor of keeping it for now."}}