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#!/usr/bin/python -u
import os
import sys
import commands
import getopt
import re
def run_or_die(command):
(status, stdio) = commands.getstatusoutput(command)
if status != 0:
raise Exception("command '%s' failed with exit status %d and output '%s'" %
(command, status, stdio))
return stdio
def rpmblob_cmp(a, b):
"""cmp() implementation for rpmblobs, suitable for use with sort()."""
ret = cmp(a['name'], b['name'])
if ret == 0:
ret = verstr_cmp(a['version'], b['version'])
if ret == 0:
ret = verstr_cmp(a['release'], b['release'])
return ret
def verstr_cmp(a, b):
"""cmp() implementation for version strings, suitable for use with sort()."""
ret = 0
index = 0
a_parts = subdivide(a)
b_parts = subdivide(b)
prerelease_pattern = re.compile('rc|pre')
while ret == 0 and index < min(len(a_parts), len(b_parts)):
subindex = 0
a_subparts = a_parts[index]
b_subparts = b_parts[index]
while ret == 0 and subindex < min(len(a_subparts), len(b_subparts)):
ret = cmp(a_subparts[subindex], b_subparts[subindex])
if ret != 0:
return ret
subindex = subindex + 1
if len(a_subparts) != len(b_subparts):
# handle prerelease special case at subpart level (ie, '4.0.2rc5').
if len(a_subparts) > len(b_subparts) and prerelease_pattern.match(str(a_subparts[subindex])):
return -1
elif len(a_subparts) < len(b_subparts) and prerelease_pattern.match(str(b_subparts[subindex])):
return 1
else:
return len(a_subparts) - len(b_subparts)
index = index + 1
if len(a_parts) != len(b_parts):
# handle prerelease special case at part level (ie, '4.0.2.rc5).
if len(a_parts) > len(b_parts) and prerelease_pattern.match(str(a_parts[index][0])):
return -1
elif len(a_parts) < len(b_parts) and prerelease_pattern.match(str(b_parts[index][0])):
return 1
else:
return len(a_parts) - len(b_parts)
return ret
def subdivide(verstr):
"""subdivide takes a version or release string and attempts to subdivide it into components to facilitate sorting. The string is divided into a two level hierarchy of sub-parts. The upper level is subdivided by periods, and the lower level is subdivided by boundaries between digit, alpha, and other character groupings."""
parts = []
# parts is a list of lists representing the subsections which make up a version string.
# example:
# 4.0.2b3 would be represented as [[4],[0],[2,'b',3]].
major_parts = verstr.split('.')
for major_part in major_parts:
minor_parts = []
index = 0
while index < len(major_part):
# handle digit subsection
if major_part[index].isdigit():
digit_str_part = ""
while index < len(major_part) and major_part[index].isdigit():
digit_str_part = digit_str_part + major_part[index]
index = index + 1
digit_part = int(digit_str_part)
minor_parts.append(digit_part)
# handle alpha subsection
elif major_part[index].isalpha():
alpha_part = ""
while index < len(major_part) and major_part[index].isalpha():
alpha_part = alpha_part + major_part[index]
index = index + 1
minor_parts.append(alpha_part)
# handle other characters. this should only be '_', but we will treat is as a subsection to keep it general.
elif not major_part[index].isalnum():
other_part = ""
while index < len(major_part) and not major_part[index].isalnum():
other_part = other_part + major_part[index]
index = index + 1
minor_parts.append(other_part)
parts.append(minor_parts)
return parts
def get_pkgs(rpmdir):
"""scan a dir of rpms and generate a pkgs structure."""
pkgs = {}
"""
pkgs structure:
* pkgs is a dict of package name, rpmblob list pairs:
pkgs = {name:[rpmblob,rpmblob...], name:[rpmblob,rpmblob...]}
* rpmblob is a dict describing an rpm file:
rpmblob = {'file':'foo-0.1-5.i386.rpm', 'name':'foo', 'version':'0.1', 'release':'5', 'arch':'i386'},
example:
pkgs = {
'foo' : [
{'file':'foo-0.1-5.i386.rpm', 'name':'foo', 'version':'0.1', 'release':'5', 'arch':'i386'},
{'file':'foo-0.2-3.i386.rpm', 'name':'foo', 'version':'0.2', 'release':'3', 'arch':'i386'}],
'bar' : [
{'file':'bar-3.2a-12.mips.rpm', 'name':'bar', 'version':'3.2a', 'release':'12', 'arch':'mips'},
{'file':'bar-3.7j-4.mips.rpm', 'name':'bar', 'version':'3.7j', 'release':'4', 'arch':'mips'}]
}
"""
rpms = [item for item in os.listdir(rpmdir) if item.endswith('.rpm')]
for rpm in rpms:
cmd = 'rpm --nosignature --queryformat \'%%{NAME} %%{VERSION} %%{RELEASE} %%{ARCH}\' -q -p %s/%s' % (rpmdir, rpm)
output = run_or_die(cmd)
try:
(name, version, release, arch) = output.split()
except:
print "cmd:", cmd
print "output:", output
raise
rpmblob = {'file':rpm, 'name':name, 'version':version, 'release':release, 'arch':arch}
if pkgs.has_key(name):
pkgs[name].append(rpmblob)
else:
pkgs[name] = [rpmblob]
return pkgs
def prune_pkgs(pkgs):
"""prune a pkgs structure to contain only the latest version of each package (includes multiarch results)."""
latest_pkgs = {}
for rpmblobs in pkgs.values():
(major, minor) = sys.version_info[:2]
if major >= 2 and minor >= 4:
rpmblobs.sort(rpmblob_cmp, reverse=True)
else:
rpmblobs.sort(rpmblob_cmp)
rpmblobs.reverse()
pkg_name = rpmblobs[0]['name']
all_archs = [blob for blob in rpmblobs if blob['version'] == rpmblobs[0]['version'] and
blob['release'] == rpmblobs[0]['release']]
latest_pkgs[pkg_name] = all_archs
return latest_pkgs
def prune_archs(pkgs):
"""prune a pkgs structure to contain no more than one subarch per architecture for each set of packages."""
subarch_mapping = {'x86':['i686','i586','i386'], 'x86_64':['x86_64'], 'noarch':['noarch']}
arch_mapping = {'i686':'x86', 'i586':'x86', 'i386':'x86', 'x86_64':'x86_64', 'noarch':'noarch'}
pruned_pkgs = {}
for rpmblobs in pkgs.values():
pkg_name = rpmblobs[0]['name']
arch_sifter = {}
for challenger in rpmblobs:
arch = arch_mapping[challenger['arch']]
incumbent = arch_sifter.get(arch)
if incumbent == None:
arch_sifter[arch] = challenger
else:
subarchs = subarch_mapping[arch]
challenger_index = subarchs.index(challenger['arch'])
incumbent_index = subarchs.index(incumbent['arch'])
if challenger_index < incumbent_index:
arch_sifter[arch] = challenger
pruned_pkgs[pkg_name] = arch_sifter.values()
return pruned_pkgs
def scan_rpm_dir(rpmdir, uri, group, priority=0, output=sys.stdout):
"""the meat of this library."""
output.write('<PackageList uri="%s" type="rpm" priority="%s">\n' % (uri, priority))
output.write(' <Group name="%s">\n' % group)
pkgs = prune_archs(prune_pkgs(get_pkgs(rpmdir)))
for rpmblobs in pkgs.values():
if len(rpmblobs) == 1:
# regular pkgmgr entry
rpmblob = rpmblobs[0]
output.write(' <Package name="%s" simplefile="%s" version="%s-%s"/>\n' %
(rpmblob['name'], rpmblob['file'], rpmblob['version'], rpmblob['release']))
else:
# multiarch pkgmgr entry
rpmblob = rpmblobs[0]
archs = [blob['arch'] for blob in rpmblobs]
archs.sort()
multiarch_string = ' '.join(archs)
pattern_string = '\.(%s)\.rpm$' % '|'.join(archs) # e.g., '\.(i386|x86_64)\.rpm$'
pattern = re.compile(pattern_string)
multiarch_file = pattern.sub('.%(arch)s.rpm', rpmblob['file']) # e.g., 'foo-1.0-1.%(arch)s.rpm'
output.write(' <Package name="%s" file="%s" version="%s-%s" multiarch="%s"/>\n' %
(rpmblob['name'], multiarch_file, rpmblob['version'], rpmblob['release'], multiarch_string))
output.write(' </Group>\n')
output.write('</PackageList>\n')
def usage(output=sys.stdout):
output.write("Usage: %s [-g <groupname>] [-u <uri>] [-d <dir>] [-p <priority>] [-o <output>]\n" % sys.argv[0])
if __name__ == "__main__":
try:
opts, args = getopt.getopt(sys.argv[1:], "g:u:d:p:o:",
["group=", "uir=", "dir=", "priority=", "output="])
except getopt.GetoptError:
usage(sys.stderr)
sys.exit(1)
group = "base"
uri = "http://localhost/rpms"
rpmdir = "."
priority = "0"
output = None
for opt, arg in opts:
if opt in ['-g', '--group']:
group = arg
elif opt in ['-u', '--uri']:
uri = arg
elif opt in ['-d', '--dir']:
rpmdir = arg
elif opt in ['-p', '--priority']:
priority = arg
elif opt in ['-o', '--output']:
output = arg
if output == None:
output = sys.stdout
else:
output = file(output,"w")
scan_rpm_dir(rpmdir, uri, group, priority, output)
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