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# portage.py -- core Portage functionality
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# Copyright 1998-2003 Daniel Robbins, Gentoo Technologies, Inc.
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# Distributed under the GNU Public License v2
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# $Header: /var/cvsroot/gentoo-src/portage/pym/portage_md5.py,v 1.3 2004/08/17 01:12:56 carpaski Exp $
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from portage_const import PRIVATE_PATH,PRELINK_BINARY
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import os
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import shutil
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import portage_exec
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import portage_util
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import portage_locks
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import commands
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prelink_capable = False
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results = commands.getstatusoutput(PRELINK_BINARY+" --version > /dev/null 2>&1")
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if (results[0] >> 8) == 0:
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prelink_capable=1
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del results
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def perform_md5(x, calc_prelink=0):
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return perform_checksum(x, calc_prelink)[0]
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# We _try_ to load this module. If it fails we do the slow fallback.
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try:
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import fchksum
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def perform_checksum(filename, calc_prelink=False):
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prelink_tmpfile = PRIVATE_PATH+"/prelink-checksum.tmp"
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if calc_prelink and prelink_capable:
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# Create non-prelinked temporary file to md5sum.
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mylock = portage_locks.lockfile(prelink_tmpfile, wantnewlockfile=1)
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try:
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shutil.copy2(filename,prelink_tmpfile)
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except Exception,e:
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writemsg("!!! Unable to copy file '"+str(filename)+"'.\n")
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writemsg("!!! "+str(e)+"\n")
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sys.exit(1)
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portage_exec.spawn(PRELINK_BINARY+" --undo "+prelink_tmpfile+" &>/dev/null", free=1)
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retval = fchksum.fmd5t(prelink_tmpfile)
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os.unlink(prelink_tmpfile)
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portage_locks.unlockfile(mylock)
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return retval
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else:
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return fchksum.fmd5t(filename)
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except ImportError:
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import md5
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def perform_checksum(filename, calc_prelink=prelink_capable):
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prelink_tmpfile = PRIVATE_PATH+"/prelink-checksum.tmp"
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mylock = portage_locks.lockfile(prelink_tmpfile, wantnewlockfile=1)
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myfilename=filename
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if calc_prelink and prelink_capable:
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# Create non-prelinked temporary file to md5sum.
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# Raw data is returned on stdout, errors on stderr.
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# Non-prelinks are just returned.
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try:
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shutil.copy2(filename,prelink_tmpfile)
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except Exception,e:
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writemsg("!!! Unable to copy file '"+str(filename)+"'.\n")
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writemsg("!!! "+str(e)+"\n")
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sys.exit(1)
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portage_exec.spawn(PRELINK_BINARY+" --undo "+prelink_tmpfile+" &>/dev/null", free=1)
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myfilename=prelink_tmpfile
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f = open(myfilename, 'rb')
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blocksize=32768
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data = f.read(blocksize)
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size = 0L
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sum = md5.new()
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while data:
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sum.update(data)
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size = size + len(data)
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data = f.read(blocksize)
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f.close()
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if calc_prelink and prelink_capable:
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os.unlink(prelink_tmpfile)
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portage_locks.unlockfile(mylock)
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return (sum.hexdigest(),size)
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