1. docker
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update docs/reference/commandline/cp.md

Close #22020

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

Akihiro Suda authored on 2016/05/23 18:10:14
Showing 2 changed files
docs/reference/commandline/cp.md
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@@ -81,7 +81,17 @@ you must be explicit with a relative or absolute path, for example:
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     `/path/to/file:name.txt` or `./file:name.txt`
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 It is not possible to copy certain system files such as resources under
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-`/proc`, `/sys`, `/dev`, and mounts created by the user in the container.
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+`/proc`, `/sys`, `/dev`, [tmpfs](run.md#mount-tmpfs-tmpfs), and mounts created by
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+the user in the container. However, you can still copy such files by manually
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+running `tar` in `docker exec`. For example (consider `SRC_PATH` and `DEST_PATH`
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+are directories):
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+
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+    $ docker exec foo tar Ccf $(dirname SRC_PATH) - $(basename SRC_PATH) | tar Cxf DEST_PATH -
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+
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+or
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+
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+    $ tar Ccf $(dirname SRC_PATH) - $(basename SRC_PATH) | docker exec -i foo tar Cxf DEST_PATH -
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+
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 Using `-` as the `SRC_PATH` streams the contents of `STDIN` as a tar archive.
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 The command extracts the content of the tar to the `DEST_PATH` in container's
man/docker-cp.1.md
History View file @ cb1635c
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@@ -78,7 +78,16 @@ you must be explicit with a relative or absolute path, for example:
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     `/path/to/file:name.txt` or `./file:name.txt`
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 It is not possible to copy certain system files such as resources under
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-`/proc`, `/sys`, `/dev`, and mounts created by the user in the container.
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+`/proc`, `/sys`, `/dev`, tmpfs, and mounts created by the user in the container.
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+However, you can still copy such files by manually running `tar` in `docker exec`.
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+For example (consider `SRC_PATH` and `DEST_PATH` are directories):
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+
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+    $ docker exec foo tar Ccf $(dirname SRC_PATH) - $(basename SRC_PATH) | tar Cxf DEST_PATH -
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+
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+or
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+
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+    $ tar Ccf $(dirname SRC_PATH) - $(basename SRC_PATH) | docker exec -i foo tar Cxf DEST_PATH -
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+
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 Using `-` as the `SRC_PATH` streams the contents of `STDIN` as a tar archive.
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 The command extracts the content of the tar to the `DEST_PATH` in container's