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import stat, os, shutil, urllib, subprocess
from itertools import dropwhile
def create_directory(path, ignore_failure=True, uid=-1, gid=-1, modes=""):
try:
os.makedirs(path)
except OSError, e:
if ignore_failure:
pass
else:
raise
if uid != -1 or gid != -1:
os.chown(path, uid, gid)
if modes != "":
set_modes(path, modes)
def copy_file(source, destination, ignore_failure=True, uid=-1, gid=-1, modes=""):
if ignore_failure == False:
if os.path.exists(destination):
raise Exception("Destination path already exists.")
try:
shutil.copy(source, destination)
except IOError, e:
if ignore_failure:
pass
else:
raise
if uid != -1 or gid != -1:
os.chown(destination, uid, gid)
if modes != "":
set_modes(destination, modes)
def copy_directory(source, destination, ignore_failure=True, uid=-1, gid=-1, modes=""):
if ignore_failure == False:
if os.path.exists(destination):
raise Exception("Destination path already exists.")
try:
shutil.copytree(source, destination)
except IOError, e:
if ignore_failure:
pass
else:
raise
if uid != -1 or gid != -1:
os.chown(destination, uid, gid)
if modes != "":
set_modes(destination, modes)
def create_file(path, contents="", uid=-1, gid=-1, modes=""):
f = open(path, "w")
if contents != "":
f.write(contents)
f.close()
if uid != -1 or gid != -1:
os.chown(path, uid, gid)
if modes != "":
set_modes(path, modes)
def set_modes(path, modes):
mode_map = {
"u": {
"r": stat.S_IRUSR,
"w": stat.S_IWUSR,
"x": stat.S_IXUSR
},
"g": {
"r": stat.S_IRGRP,
"w": stat.S_IWGRP,
"x": stat.S_IXGRP
},
"o": {
"r": stat.S_IROTH,
"w": stat.S_IWOTH,
"x": stat.S_IXOTH
}
}
chunks = modes.split(" ")
mode = 0
for chunk in chunks:
usertype, changes = chunk.split("+")
if usertype in mode_map:
for change in list(changes):
if change in mode_map[usertype]:
mode = mode | mode_map[usertype][change]
else:
raise Exception("Unknown permission in modes specification.")
elif usertype == "a":
for change in list(changes):
for i in mode_map:
if change in mode_map[i]:
mode = mode | mode_map[i][change]
else:
raise Exception("Unknown user type in modes specification.")
os.chmod(path, mode)
def download_file(name, mirrors):
try:
file_mirrors = mirrors[name]
except KeyError, e:
raise Exception("No such file exists in the mirror list.")
for url in file_mirrors:
try:
urllib.urlretrieve(url, name)
except:
continue
else:
return name
raise Exception("No functional mirrors found for this file.")
def install_rpm(path):
stfu = open("/dev/null", "wb")
result = subprocess.call(["yum", "--nogpgcheck", "install", "-y", path], stdout=stfu, stderr=stfu)
stfu.close()
if result != 0:
raise Exception("Failed to install package.")
def install_remote_rpm(name, mirrors):
download_file(name, mirrors)
install_rpm(name)
def rindex(lst, item):
# http://stackoverflow.com/a/6892096/1332715
try:
return dropwhile(lambda x: lst[x].strip() != item, reversed(xrange(len(lst)))).next()
except StopIteration:
raise ValueError, "rindex(lst, item): item not in list"