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>
hydrargyrum
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Aug 26, 2026
| return nil, errors.New("container ID file found, make sure the other container isn't running or delete " + cidPath) | ||
| // mktemp (and similar) create an empty file first. Only refuse the path | ||
| // when it already holds a container ID from another run. | ||
| f, err := os.OpenFile(cidPath, os.O_RDWR|os.O_CREATE, 0o644) |
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If the file does not exist, it is created with mode 0o666 (before umask)
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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