container: allow an empty --cidfile path from mktemp - #7239
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newCIDFile currently errors if the path already exists, even when the file is empty. mktemp creates that empty file first, so `docker run --cidfile=$(mktemp)` always fails. Keep refusing a path that already holds a container ID. Open/create otherwise so an empty file can be reused. Fixes docker#5954 Signed-off-by: Dean Chen <862469039@qq.com>
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--cidfilecurrently errors if the path already exists, even when the file is empty.that's a pain with
mktemp, which creates the file first:only refuse the path if it already has content (another container's id). empty files get reused.
Fixes #5954