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Re: [Xen-devel] [PATCH 1/5] tools/mkrpm: improve version.release handling

On 03/20/2015 05:24 PM, Olaf Hering wrote:
> An increasing version and/or release number helps to update existing
> packages without --force as in "rpm Uvh --force xen.rpm". Instead its
> possible to do "rpm -Fvh *.rpm" to update only already installed
> packages.
> The usage of --force disables essentials checks such as file conflict
> detection. As a result the new xen.rpm may overwrite files owned by
> other packages.
> With the current way of calculating version-release it is difficult to
> get an increasing release number into the spec file. The release is
> always zero unless "make make XEN_VENDORVERSION=`date +.%s`" is used,
> which has the bad side effect that xen.gz always gets a different
> filename every time.
> Since the value of release has no meaning its fine to have an ever
> increasing number. This could be either the number of seconds (+%s), or
> some representation which could mean something to a human. The change
> uses a representation of date+time.
> Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

Hey Olaf,

Sorry for not getting back to you with this before.

I applied this patch, and the name came out looking like this:


I'm not really happy with having the massive number show up
automatically when anyone makes an rpm.  What would you think about
adding a variable where you could set this as part of the build process?
  XEN_RPM_RELEASE="$(date +%Y%m%d%H%M%S)" make rpmball


> ---
>  tools/misc/mkrpm | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> diff --git a/tools/misc/mkrpm b/tools/misc/mkrpm
> index 9b8c6d9..b54de24 100644
> --- a/tools/misc/mkrpm
> +++ b/tools/misc/mkrpm
> @@ -13,13 +13,11 @@ fi
>  xenroot="$1"
> -# rpmbuild doesn't like dashes in the version; break it down into
> -# version and release.  Default to "0" if there isn't a release.
> -v=(${2/-/ })
> -version=${v[0]}
> -release=${v[1]}
> -
> -[[ -n "$release" ]] || release="0"
> +# rpmbuild doesn't support dashes in the version;
> +version=${2//-/_}
> +# Use an ever increasing release number for this devel pkg.
> +# This makes sure rpm -Fvh xen$PKG_SUFFIX.rpm can be updated wihtout --force.
> +release="`date +%Y%m%d%H%M%S`"
>  cd $xenroot

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