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moby--moby/daemon/graphdriver/copy
Sebastiaan van Stijn c7a38c2c06
Graphdriver: fix "device" mode not being detected if "character-device" bit is set
Due to a bug in Golang (github.com/golang#27640), the "character device"
bit was omitted when checking file-modes with `os.ModeType`.

This bug was resolved in Go 1.12, but as a result, graphdrivers
would no longer recognize "device" files, causing pulling of
images that have a file with this filemode to fail;

    failed to register layer:
    unknown file type for /var/lib/docker/vfs/dir/.../dev/console

The current code checked for an exact match of Modes to be set. The
`os.ModeCharDevice` and `os.ModeDevice` bits will always be set in
tandem, however, because the code was only looking for an exact
match, this detection broke now that `os.ModeCharDevice` was added.

This patch changes the code to be more defensive, and instead
check if the `os.ModeDevice` bit is set (either with, or without
the `os.ModeCharDevice` bit).

In addition, some information was added to the error-message if
no type was matched, to assist debugging in case additional types
are added in future.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2019-02-20 11:08:58 +01:00
..
copy.go Graphdriver: fix "device" mode not being detected if "character-device" bit is set 2019-02-20 11:08:58 +01:00
copy_test.go Update tests to use gotest.tools 👼 2018-06-13 09:04:30 +02:00