Can't get license from RPM file

[ice799]

Hi:

I am unable to use the [] method to get the license string from RPM packages with licenses. For example: strace-4.8-4.3.x86_64.rpm (which you can get here: ftp://rpmfind.net/linux/opensuse/factory/repo/oss/suse/x86_64/strace-4.8-4.3.x86_64.rpm)

[joe@mawu:/tmp]% md5sum strace-4.8-4.3.x86_64.rpm
MD5 (strace-4.8-4.3.x86_64.rpm) = 63fc4a8049b7833d65255487b64256ac
[joe@mawu:/tmp]% irb  
irb(main):001:0> require 'rubygems'
=> false
irb(main):002:0> require 'rpm'
=> true
irb(main):003:0> pkg = RPM::Package.open("strace-4.8-4.3.x86_64.rpm")
warning: strace-4.8-4.3.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 3dbdc284: NOKEY
=> #<RPM::Package:0x007f8f8c071bd8 @hdr=#<FFI::AutoPointer address=0x007f8f8b95be80>>
irb(main):004:0> pkg[:arch]
=> "x86_64"
irb(main):005:0> pkg[:name]
=> "strace"
irb(main):006:0> pkg[:license]
=> nil

Yet if I use rpm on the command line and queryformat:

[joe@mawu:/tmp]% rpm -q -p ./strace-4.8-4.3.x86_64.rpm --queryformat "%{LICENSE}\n"
warning: ./strace-4.8-4.3.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 3dbdc284: NOKEY
BSD-3-Clause

Same for other RPMs.

I am using rpm version: RPM version 4.9.1.1

Thanks

[dmacvicar]

For some reason FFI is not working with the enum in symbol mode. It works with eg. :name but not with :license:

RPM::C.headerGet(ptr, :license, tagc, RPM::C::HEADERGET_MINMEM)
=> 0
RPM::C.headerGet(ptr, 1014, tagc, RPM::C::HEADERGET_MINMEM)
=> 1
RPM::C.rpmtdGetString(tagc)
=> "GPL"
RPM::C.headerGet(ptr, 1000, tagc, RPM::C::HEADERGET_MINMEM)
=> 1
RPM::C.rpmtdGetString(tagc)
=> "simple"
RPM::C.headerGet(ptr, :name, tagc, RPM::C::HEADERGET_MINMEM)
=> 1
RPM::C.rpmtdGetString(tagc)
=> "simple"