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#!/usr/bin/python
# repofs.py - Export the contents of a package repo as a readonly filesystem.
#
# Copyright 2009 Red Hat, Inc. GPLv2+ BOILERPLATE GOES HERE.
#
# Author: Will Woods <wwoods@redhat.com>
#
# Exports the contents of the repo(s) in a filesystem that looks like this:
# $PACKAGE_UID/[package contents]
# where $PACKAGE_UID is some unique package identifier (e.g. ENVRA in RPM)
import os
import glob
from stat import *
import errno
import subprocess
import time
import fuse
fuse.fuse_python_api = (0, 2)
fuse.feature_assert('stateful_files', 'has_init')
from fuse import Fuse
from sqlite3 import dbapi2 as sqlite
import bz2, gzip
import yum.repoMDObject
FILEMODE = S_IRUSR|S_IRGRP|S_IROTH
DIRMODE = FILEMODE|S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH
def bunzip(infile,outfile):
(p,f) = os.path.split(outfile)
if not os.path.isdir(p):
os.makedirs(p)
outf = open(outfile,"w")
inf = bz2.BZ2File(infile)
data = inf.read(4096)
while data:
outf.write(data)
data = inf.read(4096)
inf.close()
outf.close()
def flag2mode(flags):
md = {os.O_RDONLY: 'r', os.O_WRONLY: 'w', os.O_RDWR: 'w+'}
m = md[flags & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR)]
if flags | os.O_APPEND:
m = m.replace('w', 'a', 1)
return m
def fuseclonestat(stat):
s = fuse.Stat()
(s.st_mode, s.st_ino, s.st_dev, s.st_nlink, s.st_uid, s.st_gid, s.st_size,
s.st_atime, s.st_mtime, s.st_ctime) = stat
return s
def leading_paths(dir):
dirlist = []
while dir:
dirlist.append(dir)
if dir == '/':
break
(dir, dummy) = os.path.split(dir)
return dirlist
class SimpleYumRepo(object):
def __init__(self, path=None, cachedir=None):
self.path = path
self.cachedir = cachedir
self.pkgkey = {}
if path:
self.parse_repomd()
def parse_repomd(self):
repomd = os.path.join(self.path, "repodata/repomd.xml")
repoXML = yum.repoMDObject.RepoMD(self.path, repomd)
for t in ('primary_db', 'filelists_db'):
if t in repoXML.fileTypes():
d = repoXML.getData(t)
(base,dbpath) = d.location
dbfile = os.path.join(self.path,dbpath)
# TODO check for existing db file
if dbfile.endswith(".bz2"):
outfile = os.path.join(self.cachedir,".repodata",
os.path.basename(dbfile)[:-4])
bunzip(dbfile,outfile)
dbfile = outfile
# TODO: elif .gz, else...
con = sqlite.connect(dbfile)
setattr(self,t,con)
for p in self.package_uids():
pass
# This is kind of stupid - we need this cached to use files_for_package..
# Maybe this should populate the cache and package_uids() can just return
# pkgkey.keys()
def package_uids(self):
'''Generator for package UIDs in this repo'''
c = self.primary_db.cursor()
c.execute("SELECT epoch, name, version, release, arch, pkgKey FROM packages")
for (e,n,v,r,a,key) in c:
nevra = "%s-%s:%s-%s.%s" % (n,e,v,r,a)
self.pkgkey[nevra] = key
yield nevra
def files_for_package(self, packageuid):
'''Generator for files in the given packageuid.
Each item is a tuple of the form (abspath,type) where type is
'd' or 'f' (dir/file).'''
c = self.filelists_db.cursor()
key = self.pkgkey.get(packageuid)
if not key:
raise StopIteration # like returning an empty list
c.execute("SELECT dirname, filenames, filetypes FROM filelist "
"WHERE pkgKey=?",(key,))
dirs = []
for (dir,names,types) in c:
if dir not in dirs:
for d in leading_paths(dir):
if d not in dirs:
dirs.append(d)
yield (d,'d')
for (n,t) in zip(names.split('/'),types):
f = os.path.join(dir,n)
if t == 'd' and f in dirs:
continue
else:
dirs.append(f)
yield (f,t)
def unpack(self,rpm,targetdir=None):
if targetdir:
if not os.path.isdir(targetdir):
os.makedirs(targetdir)
else:
targetdir = self.cachedir
inf = open(rpm)
# Find RPM header and read compression algorithm
# Skip forward to gzipped CPIO archive
# FIXME: Awful. Just awful. At least use rpm2cpio.
header = inf.read(409600)
offset = header.index("\x1f\x8b")
del header
inf.seek(offset)
gz = gzip.GzipFile(fileobj=inf, mode="rb")
# Open a pipe to "cpio -iumd --quiet"
cpio = subprocess.Popen(args=["cpio","-iumd","--quiet"],
cwd=targetdir, stdin=subprocess.PIPE)
data = gz.read(4096)
while data:
cpio.stdin.write(data)
data = gz.read(4096)
gz.close()
inf.close()
cpio.stdin.close()
cpio.wait()
class FuseRO(Fuse):
'''A Fuse subclass for implementing readonly filesystems.'''
# chmod chown create link mkdir mknod rename rmdir setxattr(?) symlink
# truncate unlink write
def __rofs(self, *args):
'''Raises OSError(EROFS,"Read-only filesystem")'''
raise OSError(errno.EROFS, "Read-only filesystem")
chmod = __rofs
chown = __rofs
link = __rofs
mkdir = __rofs
rename = __rofs
rmdir = __rofs
setxattr = __rofs # You might override this so you can store xattrs
symlink = __rofs
truncate = __rofs
unlink = __rofs
def write(self, *args):
'''write() function that raises IOError(EBADF)
You can't open files for writing; this is a readonly filesystem!'''
raise IOError(errno.EBADF, "write() on readonly filesystem")
def _check_open(self, flags):
'''checks the open() flags, and returns False if write access
was requested. Returns True otherwise.'''
accmode = os.O_RDONLY | os.O_WRONLY | os.O_RDWR
return (flags & accmode) == os.O_RDONLY
class Repofs(FuseRO):
def __init__(self, *args, **kw):
Fuse.__init__(self, *args, **kw)
# FIXME: this logging is terrible
def log(self,message):
self.logfile.write("%s %s\n" % (time.asctime(), message))
def fsinit(self):
if not os.path.isdir(self.cachedir):
os.makedirs(self.cachedir)
# FIXME this logging is awful
self.logfile = open(os.path.join(self.cachedir,".log"),"a",0)
self.log("fsinit(path=%s). Hang on.." % self.repopath)
# TODO: figure out the repo type (Yum, etc) and use the right class.
# That way we can support other distros. Yay!
self.repos = []
for rp in self.repopath.split(":"):
r = SimpleYumRepo(path=rp, cachedir=self.cachedir)
self.repos.append(r)
self.log(" cachedir=%s, repopath=%s" % (r.cachedir, r.path))
def _splitpath(self, path):
'''Split an absolute path into (packageuid, path)'''
path = path.lstrip('/')
p = path.split('/',1)
if len(p) == 1:
p.append('')
p[1] = '/' + p[1]
return p
def readdir(self, path, offset):
self.log("readdir('%s', %s)" % (path, str(offset)))
for repo in self.repos:
if path == "/":
for uid in repo.package_uids():
d = fuse.Direntry(str(uid))
d.type = S_IFDIR
yield d
else:
(packageuid, path) = self._splitpath(path)
for (f,t) in repo.files_for_package(packageuid):
(dir, basename) = os.path.split(f)
if dir == path and basename:
d = fuse.Direntry(str(basename))
if t == 'd':
d.type = S_IFDIR
else:
d.type = S_IFREG
yield d
def getattr(self, path):
self.log("getattr('%s')" % path)
attr = fuse.Stat()
attr.st_mode = None
attr.st_nlink = 2 # sure, why not
if (path == '/'):
attr.st_mode = DIRMODE
return attr
(packageuid, path) = self._splitpath(path)
for repo in self.repos:
for (f,t) in repo.files_for_package(packageuid):
if f == path:
# found it! set mode to -r--r--r--
attr.st_mode = FILEMODE
if t == 'd': # change mode to dr-xr-xr-x
attr.st_mode = DIRMODE
# TODO: set some more attributes
return attr
#raise OSError(errno.ENOENT, "No such file or directory")
# SourceForge FUSE Python reference says to use this instead:
return -errno.ENOENT
# # FIXME actually use the provided arg
# def utime(self, path, times):
# self.log("utime(%s, %s)" % path, str(times))
# return os.utime(self._cachefile(path))
# def access(self, path, mode):
# self.log("access(%s, %s)" % path, mode)
# if not os.access(self._cachefile(path)):
# return -errno.EACCES
#
def statfs(self):
#self.log("statfs()")
s = fuse.StatVFS()
local_s = os.statvfs(self.cachedir)
# FIXME modify s using info from local_s
return local_s
#
# # XXX explicitly declare other functions that return proper error codes?
#
# # FIXME: use file objects instead?
#
# def open(self, path, flags):
# self.log("open(%s,%s)" % (path,flags))
# return open(self._cachefile(path),flag2mode(flags))
#
# def read(self, path, length, offset, fh=None):
# self.log("read(%s,%s,%s)" % (path,length,offset))
# fh.seek(offset)
# return fh.read(length)
#
# def release(self, path, fh=None):
# self.log("release(%s)" % path)
# fh.close()
#
# def fgetattr(self, path, fh=None):
# self.log("fgetattr(%s)" % path)
# return os.fstat(fh.fileno())
def main(self, *a, **kw):
return Fuse.main(self, *a, **kw)
def main():
usage = 'Repofs: mount a package repo and export all the files in the packages.\n\n' + Fuse.fusage
server = Repofs(version="%prog " + fuse.__version__, usage=usage,
dash_s_do='setsingle')
server.parser.add_option(mountopt="repo", metavar="PATH", dest="repopath",
help="Package repo to mount")
server.parser.add_option(mountopt="cachedir", metavar="PATH",
help="Cache dir for expanded packages")
server.parse(values=server, errex=1)
server.main()
if __name__ == '__main__':
main()
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