On 11/2/14, 4:48 AM, Peter A. Bigot wrote:
A classic approach to building SD card images with varying rootfs sizes
is to create the filesystem and unpack a tar rootfs image onto it. When
done outside pseudo the encoded user and group names from the tar file
are converted to identifiers using host files, which often result in
incorrect assignment for common names like messagebus and ntp.
A solution is to create the rootfs archive using the numeric values
obtained from the target /etc files under pseudo, rather than the
corresponding names. This series provides this function as a new image
file format "nug.tar".
Peter A. Bigot (2):
image_types.bbclass: whitespace and reorder
image_types.bbclass: add tar --numeric-owner support
meta/classes/image_types.bbclass | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
I think this is incorrect.
The current tar archives contain both the uname/gname -and- uid/gid. When you
extract, if you pass --numeric-owner it will switch from name to number. (At
least it has whenever I've done it.) The default though is to use the uname/gname.
The issue with switching to uid/gid is that you can end up changing the default
and you may enough end up dumping the name version. This can cause security
issues if you do partial extracts and there was some type of a mismatch between
the original system and the one being extracted. (Think field
upgrade/debug/update cycle.)
--Mark
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