[pacman-dev] [PATCH] makepkg: add mtree file into package

Florian Pritz bluewind at xinu.at
Mon Apr 30 05:55:21 EDT 2012

On 30.04.2012 08:22, Allan McRae wrote:
> Add an mtree file to the package with all file information. This
> can be added to the local pacman database on install allowing full
> package verification.
> Signed-off-by: Allan McRae <allan at archlinux.org>
> ---
> Two things I want to query here...
> 1) bsdtar -czf .MTREE ....
> When creating the package, we use gzip instead of bsdtar's -z option due
> to it including time stamps.  From memory this was important due to package
> deltas.  So I guess that does not apply here?
> 2) The timestamps are interesting....
>  - etc/bash_completion.d/burp time=1335764490.307580112
>  - etc/bash_completion.d/burp time=1335764490.0
> The first is from creating the .MTREE file before compressing the package.
> The second is creating the mtree file from files on the filesystem after the
> package is installed.  Does anyone know what is going on here? 

Tar saves the time as a UNIX timestamp so the precision is seconds. file
systems range from 1 second precision to (for whatever reason) 1
nanosecond. Therefore if you extract the tarball the extra precision you
had before will simply be cut off.

> I guess we
> can just round the times in the mtree file to the nearest second when checking.

IMHO convert to int, don't round, but since we also have md5 sums, I
think checking should better use those.

Florian Pritz

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