Re: [gentoo-dev] unpacker.eclass

[Michał Górny]

On Wed, 1 Feb 2012 15:05:40 -0500
Mike Frysinger <vapier@g.o> wrote:

> # You have to specify the off_t size ... I have no idea how to
> extract that # information out of the binary executable myself.
> Basically you pass in # the size of the off_t type (in bytes) on the
> machine that built the pdv # archive.

Can't you use 'file' to determine the host type and just assume off_t
for it?

> # @FUNCTION: unpack_makeself
> # @USAGE: [file to unpack] [offset] [tail|dd]
> # @DESCRIPTION:
> # Unpack those pesky makeself generated files ...
> # They're shell scripts with the binary package tagged onto
> # the end of the archive.  Loki utilized the format as does
> # many other game companies.
> #
> # If the file is not specified, then ${A} is used.  If the
> # offset is not specified then we will attempt to extract
> # the proper offset from the script itself.

The third argument is not explained.

> unpack_makeself() {
> 	local src_input=${1:-${A}}

What if ${A} contains more than a single file? Well, what is this for
anyway?

> 	case ${exe} in
> 		tail)	exe="tail -n +${skip} '${src}'";;
> 		dd)		exe="dd ibs=${skip} skip=1
> if='${src}'";; *)		die "makeself cant handle exe
> '${exe}'" esac

What is the use of that?

> # @FUNCTION: unpacker

Wrong name.

> # @USAGE: [archives that we will unpack]
> # @RETURN: Dependencies needed to unpack all the archives
> # @DESCRIPTION:
> # Walk all the specified files (defaults to $SRC_URI) and figure out
> the # dependencies that are needed to unpack things.
> #
> # Note: USE flags are not yet handled.
> unpacker_src_uri_depends() {
> 	local uri deps d
>
> 	[[ $# -eq 0 ]] && set -- ${SRC_URI}
>
> 	for uri in "$@" ; do
> 		case ${uri} in
> 		*.rar|*.RAR)
> 			d="app-arch/unrar" ;;
> 		*.7z)
> 			d="app-arch/p7zip" ;;

Where are those file formats handled? You don't seem to fallback to
'unpack' anywhere too.

And I think you should consider using 'file --mime' rather than
relying on format descriptions not ever changing/differing due to
subtle differences.

-- 
Best regards,
Michał Górny