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import types, os, sys, isys, select, string
def getArch ():
arch = os.uname ()[4]
if (len (arch) == 4 and arch[0] == 'i' and
arch[2:4] == "86"):
arch = "i386"
if arch == "sparc64":
arch = "sparc"
return arch
def getfd(filespec, readOnly = 0):
if type(filespec) == types.IntType:
return filespec
if filespec == None:
filespec = "/dev/null"
flags = os.O_RDWR | os.O_CREAT
if (readOnly):
flags = os.O_RDONLY
return os.open(filespec, flags)
def execWithRedirect(command, argv, stdin = 0, stdout = 1, stderr = 2,
searchPath = 0, root = '/'):
stdin = getfd(stdin)
stdout = getfd(stdout)
stderr = getfd(stderr)
if not os.access (root + command, os.X_OK):
raise RuntimeError, command + " can not be run"
childpid = os.fork()
if (not childpid):
if (root != '/'): isys.chroot (root)
if type(stdin) == type("a"):
stdin == os.open(stdin, os.O_RDONLY)
if type(stdout) == type("a"):
stdout == os.open(stdout, os.O_RDWR)
if type(stderr) == type("a"):
stderr = os.open(stderr, os.O_RDWR)
if stdin != 0:
os.dup2(stdin, 0)
os.close(stdin)
if stdout != 1:
os.dup2(stdout, 1)
os.close(stdout)
if stderr != 2:
os.dup2(stderr, 2)
os.close(stderr)
if (searchPath):
os.execvp(command, argv)
else:
os.execv(command, argv)
sys.exit(1)
(pid, status) = os.waitpid(childpid, 0)
return status
def execWithCapture(command, argv, searchPath = 0, root = '/', stdin = 0):
if not os.access (root + command, os.X_OK):
raise RuntimeError, command + " can not be run"
(read, write) = os.pipe()
childpid = os.fork()
if (not childpid):
if (root != '/'): isys.chroot (root)
os.dup2(write, 1)
if stdin:
os.dup2(stdin, 0)
os.close(stdin)
if (searchPath):
os.execvp(command, argv)
else:
os.execv(command, argv)
sys.exit(1)
os.close(write)
rc = ""
s = "1"
while (s):
select.select([read], [], [])
s = os.read(read, 1000)
rc = rc + s
os.close(read)
os.waitpid(childpid, 0)
return rc
def copyFile(source, to):
f = os.open(source, os.O_RDONLY)
t = os.open(to, os.O_RDWR | os.O_TRUNC | os.O_CREAT)
count = os.read(f, 16384)
while (count):
os.write(t, count)
count = os.read(f, 16384)
os.close(f)
os.close(t)
def memInstalled():
f = open("/proc/meminfo", "r")
mem = f.readlines()[1]
del f
fields = string.split(mem)
return int(fields[1]) / 1024
# this is a mkdir that won't fail if a directory already exists and will
# happily make all of the directories leading up to it.
def mkdirChain(dir):
if (os.path.isdir(dir)): return
elements = string.splitfields(dir, "/")
if (len(elements[0])):
which = 1
path = elements[0]
else:
which = 2
path = "/" + elements[1]
if (not os.path.isdir(path)):
os.mkdir(path, 0755)
while (which < len(elements)):
path = path + "/" + elements[which]
which = which + 1
if (not os.path.isdir(path)):
os.mkdir(path, 0755)
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