Check two RPMs and print which is the newer of the two.

rpm_vercmp.py

"""
Usage:

rpm_vercmp.py <rpmfile1> <rpmfile2>

Result:

RPM which is newer of the two  or
'Same version'
"""

import sys
import rpm

def get_header(rpm_file):
    """Returns rpm information by querying a rpm"""

    ts = rpm.ts()
    with open(rpm_file) as f:
        try:
            hdr = ts.hdrFromFdno(f.fileno())
        except rpm.error:
            ts.setVSFlags(rpm._RPMVSF_NOSIGNATURES)
            f.seek(0)
            hdr = ts.hdrFromFdno(f.fileno())

    return hdr

hdr1 = get_header(sys.argv[1])
hdr2 = get_header(sys.argv[2])

cmp_result = rpm.versionCompare(hdr1, hdr2)

#http://rpm.org/api/4.7.0/rpmlib_8h.html
# 1 if hdr1 is newer
# -1 if hdr2 is newer
# 0 if same

if cmp_result == -1:
    print(sys.argv[2])
elif cmp_result == 1:
    print(sys.argv[1])
elif cmp_result == 0:
    print('Same version')