docs: rewrite COPY --chown/--chmod, add non-octal --chmod (labs) #6430
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Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>
dvdksn
commented
Dec 19, 2025
| not translate between Linux and Windows, the use of `/etc/passwd` and `/etc/group` for | ||
| translating user and group names to IDs restricts this feature to only be viable for | ||
| Linux OS-based containers. | ||
| The `--chmod` flag is not supported when building Windows containers. |
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idk if this is worth mentioning still, it was probably a leftover from when this doc described the legacy builder. But I guess it doesn't hurt; still applies in the (experimental) wcow case.
tonistiigi
reviewed
Dec 19, 2025
| ``` | ||
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| The `--chmod` flag supports octal notation (e.g., `755`, `644`). | ||
| Symbolic notation (e.g., `+x`, `g=u`) requires the `docker/dockerfile:1-labs` |
| The `--chmod` flag supports octal notation (e.g., `755`, `644`). | ||
| Symbolic notation (e.g., `+x`, `g=u`) requires the `docker/dockerfile:1-labs` | ||
| syntax directive. This is useful when octal isn't flexible enough. For example, | ||
| `u=rwX,go=rX` sets directories to 755 and files to 644, while preserving the |
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Maybe link to man chmod like https://man.freebsd.org/cgi/man.cgi?chmod for a longer explanation.
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