Re: [Qemu-devel] [PATCH v3] scripts: use git archive in archive-source

[Gerd Hoffmann <kraxel@redhat.com>]

  Hi,

> >  tar_file=$(realpath "$1")
> > -list_file="${tar_file}.list"
> > -vroot_dir="${tar_file}.vroot"
> > +sub_file=$(mktemp "${tar_file%.tar}.sub.XXXXXXXX.tar")
> > +sub_tdir=$(mktemp -d "${tar_file%.tar}.sub.XXXXXXXX")
> 
> mktemp is not specified by POSIX; and FreeBSD man pages for mktemp
> suggest that if you don't use XXXXXX as the suffix that you are not
> guaranteed correct behavior.  Are you sure this is portable enough?  Do
> you need both a temp file and dir, or can you create the file name of
> your choice inside a temp dir, where only the dir has to have a
> randomized name?

Yes, storing temp tar in the temp dir should work.

> > +	status="$(git submodule status "$sm")"
> > +	smhash="${status# }"
> > +	smhash="${smhash#+}"
> > +	smhash="${smhash#-}"
> 
> These three lines can be consolidated into one:
> smhash=${status#[ +-]}

Ah, cool.  Learned a new trick.

> > +		smdir="$sub_tdir/$sm"
> > +		smurl="$(git config -f .gitmodules submodule.${sm}.url)"
> > +		echo "NOTICE: using temporary clone for submodule $sm"
> > +		git clone "$smurl" "$smdir"
> > +		test $? -ne 0 && error "failed to clone submodule $sm"
> 
> I know we don't want to affect the developer's normal checkout, but is
> it worth storing the temporary clone in a specifically-named
> subdirectory of their checkout instead

Hmm, we could do "git submodule init + git archive + git submodule
deinit".  With git storing a bare repo in .git/modules/$submodule these
days (and not deleting it on deinit) that'll effectively cache things.
It's a (temporary) modification of the checkout though.

Alternatively we could clone to $HOME/.cache/$somewhere, similar to the
vm tests which store downloads (and soon vm images too) below
$HOME/.cache/qemu-vm/.

cheers,
  Gerd