Re: [Xen-devel] [PATCH v2 1/8] xen: calculate XEN_BUILD_TIME using XEN_BUILD_DATE value

[Ian Jackson <ian.jackson@xxxxxxxxxx>]

Daniel Kiper writes ("Re: [PATCH v2 1/8] xen: calculate XEN_BUILD_TIME using 
XEN_BUILD_DATE value"):
> Well, this complicates situation further and it seems to me that
> sed-ery cannot be sufficient. Anyway, I will take a look how to
> solve that.

Our other current host OS is FreeBSD.  FreeBSD's date(1) uses -d for
something utterly different (also, something mad).  Can we rely on
Perl yet ?  Perl can do this kind of thing easily enough.

Alternatively we could have a wrapper script.

Andrew Cooper:
> Why are we adding yet more Xen specific logic to implement the same as
> SOURCE_DATE_EPOCH from the reproducible-builds.org effort?

We should clearly honour SOURCE_DATE_EPOCH.  But that's a different
question.

I think the right thing is something like this:

export XEN_BUILD_POSIX_TIME     ?= $(shell echo $${SOURCE_DATE_EPOCH-date +%s})
export XEN_BUILD_DATE           ?= $(shell LC_ALL=C date_parsing_epoch 
$(XEN_BUILD_EPOCH))
export XEN_BUILD_TIME           ?= $(shell LC_ALL=C date_parsing_epoch 
$(XEN_BUILD_EPOCH) +%T)

Where date_parsing_epoch is this on GNU systems

   #!/bin/sh
   set -e
   epoch=$1; shift
   date -u -d "@$epoch" "$@"

and I think something like this on FreeBSD

   #!/bin/sh
   set -e
   epoch=$1; shift
   date -u -jn -f%s "$epoch" "$@"

Ian.

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