[Bug debuginfod/25583] New: Use libarchive to extract packages?

[ross at burtonini dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25583

            Bug ID: 25583
           Summary: Use libarchive to extract packages?
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: debuginfod
          Assignee: unassigned at sourceware dot org
          Reporter: ross at burtonini dot com
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

Using rpm2cpio to extract an RPM isn't ideal because the machine serving the
RPMs may not actually have that tool on.

However, libarchive which is already a dependency can extract RPMs directly as
demonstrated with the libarchive example tool bsdtar:

$ bsdtar -tvf
/home/ross/Yocto/openbmc/build/tmp/deploy/rpm/noarch/os-release-1.0-r0.noarch.rpm
drwxr-xr-x  1 0      0           0 Nov  8 16:41 ./etc
lrwxrwxrwx  1 0      0          21 Nov  8 16:41 ./etc/os-release ->
../usr/lib/os-release
drwxr-xr-x  1 0      0           0 Nov  8 16:41 ./usr
drwxr-xr-x  1 0      0           0 Nov  8 16:41 ./usr/lib
-rw-r--r--  1 0      0         287 Nov  8 16:41 ./usr/lib/os-release

Ditto for debs, dpkg-deb may not be present but libarchive can unpack the outer
and give you access to the internals:

$ bsdtar  -tvf /var/cache/apt/archives/gdb_8.2.1-2+b1_amd64.deb
-rw-r--r--  0 0      0           4 Aug 28 16:18 debian-binary
-rw-r--r--  0 0      0        3024 Aug 28 16:18 control.tar.xz
-rw-r--r--  0 0      0     3131068 Aug 28 16:18 data.tar.xz

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