1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
# portage.py -- core Portage functionality
# Copyright 1998-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-src/portage/pym/portage_exec.py,v 1.13.2.4 2005/04/17 09:01:56 jstubbs Exp $
cvs_id_string="$Id: portage_exec.py,v 1.13.2.4 2005/04/17 09:01:56 jstubbs Exp $"[5:-2]
import os,types,atexit,string,stat
import signal
import portage_data
import portage_util
try:
import resource
max_fd_limit=resource.getrlimit(RLIMIT_NOFILE)
except SystemExit, e:
raise
except:
# hokay, no resource module.
max_fd_limit=256
spawned_pids = []
def cleanup():
global spawned_pids
while spawned_pids:
pid = spawned_pids.pop()
try:
os.kill(pid,SIGKILL)
except SystemExit, e:
raise
except:
pass
atexit.register(cleanup)
from portage_const import BASH_BINARY,SANDBOX_BINARY,SANDBOX_PIDS_FILE
sandbox_capable = (os.path.exists(SANDBOX_BINARY) and os.access(SANDBOX_BINARY, os.X_OK))
def spawn_bash(mycommand,env={},debug=False,opt_name=None,**keywords):
args=[BASH_BINARY]
if not opt_name:
opt_name=mycommand.split()[0]
if not env.has_key("BASH_ENV"):
env["BASH_ENV"] = "/etc/spork/is/not/valid/profile.env"
if debug:
args.append("-x")
args.append("-c")
args.append(mycommand)
return spawn(args,env=env,opt_name=opt_name,**keywords)
def spawn_sandbox(mycommand,uid=None,opt_name=None,**keywords):
if not sandbox_capable:
return spawn_bash(mycommand,opt_name=opt_name,**keywords)
args=[SANDBOX_BINARY]
if not opt_name:
opt_name=mycommand.split()[0]
args.append(mycommand)
if not uid:
uid=os.getuid()
try:
os.chown(SANDBOX_PIDS_FILE,uid,portage_data.portage_gid)
os.chmod(SANDBOX_PIDS_FILE,0664)
except SystemExit, e:
raise
except:
pass
return spawn(args,uid=uid,opt_name=opt_name,**keywords)
# base spawn function
def spawn(mycommand,env={},opt_name=None,fd_pipes=None,returnpid=False,uid=None,gid=None,groups=None,umask=None,logfile=None,path_lookup=True):
if type(mycommand)==types.StringType:
mycommand=mycommand.split()
myc = mycommand[0]
if not os.access(myc, os.X_OK):
if not path_lookup:
return None
myc = find_binary(myc)
if myc == None:
return None
mypid=[]
if logfile:
pr,pw=os.pipe()
mypid.extend(spawn(('tee','-i','-a',logfile),returnpid=True,fd_pipes={0:pr,1:1,2:2}))
retval=os.waitpid(mypid[-1],os.WNOHANG)[1]
if retval != 0:
# he's dead jim.
if (retval & 0xff)==0:
return (retval >> 8) # exit code
else:
return ((retval & 0xff) << 8) # signal
if not fd_pipes:
fd_pipes={}
fd_pipes[0] = 0
fd_pipes[1]=pw
fd_pipes[2]=pw
if not opt_name:
opt_name = mycommand[0]
myargs=[opt_name]
myargs.extend(mycommand[1:])
mypid.append(os.fork())
if mypid[-1] == 0:
# this may look ugly, but basically it moves file descriptors around to ensure no
# handles that are needed are accidentally closed during the final dup2 calls.
trg_fd=[]
if type(fd_pipes)==types.DictType:
src_fd=[]
k=fd_pipes.keys()
k.sort()
for x in k:
trg_fd.append(x)
src_fd.append(fd_pipes[x])
for x in range(0,len(trg_fd)):
if trg_fd[x] == src_fd[x]:
continue
if trg_fd[x] in src_fd[x+1:]:
new=os.dup2(trg_fd[x],max(src_fd) + 1)
os.close(trg_fd[x])
try:
while True:
src_fd[s.index(trg_fd[x])]=new
except SystemExit, e:
raise
except:
pass
for x in range(0,len(trg_fd)):
if trg_fd[x] != src_fd[x]:
os.dup2(src_fd[x], trg_fd[x])
else:
trg_fd=[0,1,2]
for x in range(0,max_fd_limit):
if x not in trg_fd:
try:
os.close(x)
except SystemExit, e:
raise
except:
pass
# note this order must be preserved- can't change gid/groups if you change uid first.
if gid:
os.setgid(gid)
if groups:
os.setgroups(groups)
if uid:
os.setuid(uid)
if umask:
os.umask(umask)
try:
# XXX: We would do this to stop ebuild.sh from getting any
# XXX: output, and consequently, we'd get to handle the sigINT.
#os.close(sys.stdin.fileno())
pass
except SystemExit, e:
raise
except:
pass
try:
#print "execing", myc, myargs
os.execve(myc,myargs,env)
except SystemExit, e:
raise
except Exception, e:
raise str(e)+":\n "+myc+" "+string.join(myargs)
# If the execve fails, we need to report it, and exit
# *carefully* --- report error here
os._exit(1)
sys.exit(1)
return # should never get reached
if logfile:
os.close(pr)
os.close(pw)
if returnpid:
global spawned_pids
spawned_pids.append(mypid[-1])
return mypid
while len(mypid):
retval=os.waitpid(mypid[-1],0)[1]
if retval != 0:
for x in mypid[0:-1]:
try:
os.kill(x,signal.SIGTERM)
if os.waitpid(x,os.WNOHANG)[1] == 0:
# feisty bugger, still alive.
os.kill(x,signal.SIGKILL)
os.waitpid(x,0)
except OSError, oe:
if oe.errno not in (10,3):
raise oe
# at this point we've killed all other kid pids generated via this call.
# return now.
if (retval & 0xff)==0:
return (retval >> 8) # return exit code
else:
return ((retval & 0xff) << 8) # interrupted by signal
else:
mypid.pop(-1)
return 0
def find_binary(myc):
p=os.getenv("PATH")
if p == None:
return None
for x in p.split(":"):
# if it exists, and is executable
if os.access("%s/%s" % (x,myc), os.X_OK):
return "%s/%s" % (x,myc)
return None
|
GitWeb