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#!/usr/bin/python
#remove_storage.py removes disks that were added using add_storage.py
#
#Only disks that have a conf file in /etc/storage.d/ are presented
#as choices to remove.
# Version 2.0.0
import os,sys,subprocess
import configparser
from configparser import ConfigParser
import glob
from socket import gethostname
from MythTV import MythDB
storage_dir = "/etc/storage.d"
def runcmd(cmd):
if True :
pass
else:
cmd = "echo "+cmd
#print cmd
cmdout = subprocess.getstatusoutput(cmd)
#logging.debug(" %s", cmdout)
return cmdout
def read_fstab():
f = open('/etc/fstab', 'r')
fstab=f.readlines()
f.close()
return fstab
def unmount_disk(conf):
if os.path.ismount(conf[1]):
print("Unmounting " + conf[1] + ".")
cmd = "umount %s" %conf[1]
runcmd(cmd)
def remove_fstab_entry(conf):
fstab=read_fstab()
f = open('/etc/fstab', 'w')
for line in fstab:
if not line.startswith("#"):
if line.find(conf[1]) > -1 and line.find(conf[2]) > -1 :
print("Removing " + conf[1] + " from fstab.")
else:
f.write(line)
else:
f.write(line)
f.close()
def remove_SG_entries(conf):
DB = MythDB()
host=gethostname()
with DB as c:
print("Removing " + conf[1] + " storage group\n paths from MythTV database.")
c.execute("""delete from storagegroup where hostname = %s and dirname like %s""", (host,conf[1] + '%'))
c.execute("""delete from settings where hostname = %s and value like %s""", (host,'SGweightPerDir:' + host + ':' + conf[1] + '%'))
def remove_disk_link(conf):
if os.path.islink("/data/storage/disk" + str(conf[0])):
print("Removing link /data/storage/disk%s." %(conf[0]))
cmd = "rm -f /data/storage/disk%s" %(conf[0])
runcmd(cmd)
def remove_disk_mount(conf):
print("Removing mountpoint %s." %(conf[1]))
cmd = "rm -rf %s" %(conf[1])
runcmd(cmd)
def update_conf_file(conf):
print("Updating %s file." %(conf[4]))
parser = ConfigParser()
parser.read(conf[4])
parser.set('storage','shareable',"False")
parser.set('storage','removed',"True")
with open(conf[4], 'w') as conf[4]:
parser.write(conf[4])
def usage():
help='''
remove_storage.py removes disks that were added using add_storage.py.
Only disks that have a conf file in /etc/storage.d/ are presented
as choices to remove.
Disks removed from the system are not erased or formatted.
Normal operations include (in this order):
Ask which disk to remove
Unmount the disk if mounted
Remove disk from /etc/fstab
Remove MythTV storage group paths in MythTV database
Remove disk# symlink at /data/storage/
Remove disk name mountpoint at /data/storage/
Make shareable = False in /etc/storage.d/DISKNAME.conf
Add removed = True in /etc/stoarge.d/DISKNAME.conf
Options:
-h, --help: Show this help message.
'''
print(help)
sys.exit(0)
#--------------------------------------------
def main():
all_confs = []
# get conf files that are not disk0 or not removed
for conf_file in glob.glob('%s/*.conf' %storage_dir):
this_conf = []
parser = ConfigParser()
parser.read(conf_file)
mounted = ""
try:
disk_num = parser.get('storage', 'disk_num')
except:
print("\nSkipping: " + conf_file + " is missing disk_num")
continue
try:
removed = parser.get('storage', 'removed')
except:
removed = False
if disk_num == "0" or removed:
continue
this_conf.append(int(disk_num)) #0
this_conf.append(parser.get('storage', 'mountpoint')) #1
this_conf.append(parser.get('storage', 'uuid')) #2
if os.path.ismount(this_conf[1]):
this_conf.append("(mounted)") #3
else:
this_conf.append("") #3
this_conf.append(conf_file) #4
all_confs.append(this_conf)
# sort confs on disk num
all_confs.sort(key=lambda x: x[0])
# exit if no disks found
if len(all_confs) == 0:
print("\nThere are no disks to remove. Exiting.")
sys.exit(0)
print("\nDisks found in /etc/storage.d/:\n")
# print list of disks to remove
for i,conf in enumerate(all_confs):
print(str(i+1) + ": " + conf[1] + " (disk" + str(conf[0]) + ") " + conf[3])
# get user input of disk to remove
try:
conf_select=input("\nEnter the number of the disk to remove: ")
conf_select=int(conf_select)
if conf_select > len(all_confs) or conf_select < 1:
conf_select=int("e")
except ValueError:
print("You must enter a number between 1 and " + str(len(all_confs)) + ". Exiting.")
sys.exit(0)
selected_conf = all_confs[conf_select-1]
# confirm selection
confirm_select=input("\nDisk " + selected_conf[1] + " (disk" + str(selected_conf[0]) + ") will be removed.\nAre you sure you want to remove it (yes/no)? ")
if confirm_select != "yes":
print("Exiting.")
sys.exit(0)
print("")
unmount_disk(selected_conf)
remove_fstab_entry(selected_conf)
remove_SG_entries(selected_conf)
remove_disk_link(selected_conf)
remove_disk_mount(selected_conf)
update_conf_file(selected_conf)
print("\nDisk " + selected_conf[1] + " has been removed.")
if __name__ == "__main__":
if not os.geteuid()==0:
sys.exit("\nRoot access is required to run this program.\n")
if "--help" in sys.argv or "-h" in sys.argv:
usage()
else:
main()
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