6 # Copyright (c) 2003 Intel Corporation
9 # Copyright (c) 2004-2006 The Trustees of Princeton University
10 # All rights reserved.
14 from Exceptions import *
20 ---------------------------------------------------------
21 This machine has entered a temporary debug state, so
22 Planetlab Support can login and fix any problems that
25 Please do not reboot this machine at this point, unless
26 specifically asked to.
29 ---------------------------------------------------------
33 # either at the end of the bm logic, because something failed (last_resort = True)
34 # and/or it can be invoked as a fallback very early in the bootmanager logic,
35 # so we can reach the node regardless of what happens (e.g. bm sometimes hangs)
37 def Run( vars, log, last_resort = True):
40 Bring up sshd inside the boot cd environment for debug purposes.
42 Once its running, touch the file /tmp/SSHD_RUNNING so future
43 calls to this function don't do anything.
45 Expect the following variables in vars to be set:
46 BM_SOURCE_DIR The source dir for the boot manager sources that
47 we are currently running from
51 message="Starting debug mode"
53 message="Starting fallback sshd"
56 log.write( "\n\nStep: %s.\n"%message )
58 # make sure we have the variables we need
60 BM_SOURCE_DIR= vars["BM_SOURCE_DIR"]
61 if BM_SOURCE_DIR == "":
62 raise ValueError, "BM_SOURCE_DIR"
65 raise BootManagerException, "Missing variable in vars: %s\n" % var
66 except ValueError, var:
67 raise BootManagerException, "Variable in vars, shouldn't be: %s\n" % var
70 ssh_source_files= "%s/debug_files/" % BM_SOURCE_DIR
72 ssh_home= "/root/.ssh"
73 cancel_boot_flag= "/tmp/CANCEL_BOOT"
74 sshd_started_flag= "/tmp/SSHD_RUNNING"
77 pre_sshd_script= os.path.join(ssh_source_files, "pre-sshd")
78 if os.path.exists(pre_sshd_script):
79 utils.sysexec_noerr( pre_sshd_script, log )
81 # create host keys if needed
82 if not os.path.isdir (ssh_dir):
83 utils.makedirs (ssh_dir)
84 key=ssh_dir+"/ssh_host_key"
85 if not os.path.isfile (key):
86 log.write("Creating host rsa1 key %s\n"%key)
87 utils.sysexec( "ssh-keygen -t rsa1 -b 1024 -f %s -N ''" % key, log )
88 key=ssh_dir+"/ssh_host_rsa_key"
89 if not os.path.isfile (key):
90 log.write("Creating host rsa key %s\n"%key)
91 utils.sysexec( "ssh-keygen -t rsa -f %s -N ''" % key, log )
92 key=ssh_dir+"/ssh_host_dsa_key"
93 if not os.path.isfile (key):
94 log.write("Creating host dsa key %s\n"%key)
95 utils.sysexec( "ssh-keygen -d -f %s -N ''" % key, log )
97 # (over)write sshd config
98 utils.sysexec( "cp -f %s/sshd_config %s/sshd_config" % (ssh_source_files,ssh_dir), log )
100 ### xxx ### xxx ### xxx ### xxx ### xxx
102 # always update the key, may have changed in this instance of the bootmanager
103 log.write( "Installing debug ssh key for root user\n" )
104 if not os.path.isdir ( ssh_home):
105 utils.makedirs( ssh_home )
106 utils.sysexec( "cp -f %s/debug_root_ssh_key %s/authorized_keys" % (ssh_source_files,ssh_home), log )
107 utils.sysexec( "chmod 700 %s" % ssh_home, log )
108 utils.sysexec( "chmod 600 %s/authorized_keys" % ssh_home, log )
111 if not os.path.isfile(sshd_started_flag):
112 log.write( "Starting sshd\n" )
113 utils.sysexec( "service sshd start", log )
114 # flag that ssh is running
115 utils.sysexec( "touch %s" % sshd_started_flag, log )
117 # it is expected that sshd is already running when last_resort==True
119 log.write( "sshd is already running\n" )
122 # this will make the initial script stop requesting scripts from PLC
123 utils.sysexec( "touch %s" % cancel_boot_flag, log )
126 print warning_message