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1479465f GJ |
1 | /* |
2 | * dselect - Debian package maintenance user interface | |
3 | * method.cc - access method handling | |
4 | * | |
5 | * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> | |
6 | * Copyright © 2001,2002 Wichert Akkerman <wakkerma@debian.org> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <config.h> | |
23 | #include <compat.h> | |
24 | ||
25 | #include <sys/types.h> | |
26 | #include <sys/stat.h> | |
27 | #include <sys/file.h> | |
28 | #include <sys/wait.h> | |
29 | ||
30 | #include <assert.h> | |
31 | #include <errno.h> | |
32 | #include <limits.h> | |
33 | #include <string.h> | |
34 | #include <fcntl.h> | |
35 | #include <dirent.h> | |
36 | #include <signal.h> | |
37 | #include <unistd.h> | |
38 | #include <stdlib.h> | |
39 | #include <stdio.h> | |
40 | ||
41 | #include <dpkg/i18n.h> | |
42 | #include <dpkg/dpkg.h> | |
43 | #include <dpkg/dpkg-db.h> | |
44 | #include <dpkg/subproc.h> | |
45 | #include <dpkg/command.h> | |
46 | ||
47 | #include "dselect.h" | |
48 | #include "method.h" | |
49 | ||
50 | static const char *const methoddirectories[]= { | |
51 | LIBDIR "/" METHODSDIR, | |
52 | LOCALLIBDIR "/" METHODSDIR, | |
53 | nullptr | |
54 | }; | |
55 | ||
56 | static char *methodlockfile = nullptr; | |
57 | static int methlockfd= -1; | |
58 | ||
59 | static void | |
60 | sthfailed(const char * reasoning) | |
61 | { | |
62 | curseson(); | |
63 | clear(); | |
64 | printw(_("\n\n%s: %s\n"), DSELECT, reasoning); | |
65 | attrset(A_BOLD); | |
66 | addstr(_("\nPress <enter> to continue.")); | |
67 | attrset(A_NORMAL); | |
68 | refresh(); getch(); | |
69 | } | |
70 | ||
71 | static void cu_unlockmethod(int, void**) { | |
72 | struct flock fl; | |
73 | ||
74 | assert(methodlockfile); | |
75 | assert(methlockfd); | |
76 | fl.l_type=F_UNLCK; fl.l_whence= SEEK_SET; fl.l_start=fl.l_len=0; | |
77 | if (fcntl(methlockfd,F_SETLK,&fl) == -1) | |
78 | sthfailed(_("cannot unlock access method area")); | |
79 | } | |
80 | ||
81 | static enum urqresult ensureoptions(void) { | |
82 | const char *const *ccpp; | |
83 | dselect_option *newoptions; | |
84 | int nread; | |
85 | ||
86 | if (!options) { | |
87 | newoptions = nullptr; | |
88 | nread= 0; | |
89 | for (ccpp= methoddirectories; *ccpp; ccpp++) | |
90 | readmethods(*ccpp, &newoptions, &nread); | |
91 | if (!newoptions) { | |
92 | sthfailed(_("no access methods are available")); | |
93 | return urqr_fail; | |
94 | } | |
95 | options= newoptions; | |
96 | noptions= nread; | |
97 | } | |
98 | return urqr_normal; | |
99 | } | |
100 | ||
101 | static enum urqresult lockmethod(void) { | |
102 | struct flock fl; | |
103 | ||
104 | if (methodlockfile == nullptr) | |
105 | methodlockfile = dpkg_db_get_path(METHLOCKFILE); | |
106 | ||
107 | if (methlockfd == -1) { | |
108 | methlockfd= open(methodlockfile, O_RDWR|O_CREAT|O_TRUNC, 0660); | |
109 | if (methlockfd == -1) { | |
110 | if ((errno == EPERM) || (errno == EACCES)) { | |
111 | sthfailed(_("requested operation requires superuser privilege")); | |
112 | return urqr_fail; | |
113 | } | |
114 | sthfailed(_("cannot open or create access method lockfile")); | |
115 | return urqr_fail; | |
116 | } | |
117 | } | |
118 | fl.l_type=F_WRLCK; fl.l_whence=SEEK_SET; fl.l_start=fl.l_len=0; | |
119 | if (fcntl(methlockfd,F_SETLK,&fl) == -1) { | |
120 | if (errno == EACCES || errno == EAGAIN) { | |
121 | sthfailed(_("the access method area is already locked")); | |
122 | return urqr_fail; | |
123 | } | |
124 | sthfailed(_("cannot lock access method area")); | |
125 | return urqr_fail; | |
126 | } | |
127 | push_cleanup(cu_unlockmethod, ~0, nullptr, 0, 0); | |
128 | return urqr_normal; | |
129 | } | |
130 | ||
131 | static urqresult | |
132 | falliblesubprocess(struct command *cmd) | |
133 | { | |
134 | pid_t pid; | |
135 | int i, c; | |
136 | ||
137 | cursesoff(); | |
138 | ||
139 | subproc_signals_ignore(cmd->name); | |
140 | ||
141 | pid = subproc_fork(); | |
142 | if (pid == 0) { | |
143 | subproc_signals_cleanup(0, nullptr); | |
144 | command_exec(cmd); | |
145 | } | |
146 | ||
147 | fprintf(stderr, "\n"); | |
148 | ||
149 | i = subproc_reap(pid, cmd->name, SUBPROC_WARN); | |
150 | ||
151 | subproc_signals_restore(); | |
152 | ||
153 | if (i == 0) { | |
154 | sleep(1); | |
155 | return urqr_normal; | |
156 | } | |
157 | fprintf(stderr,_("Press <enter> to continue.\n")); | |
158 | m_output(stderr, _("<standard error>")); | |
159 | do { | |
160 | c = fgetc(stdin); | |
161 | } while ((c == EOF && errno == EINTR) || (c != '\n' && c != EOF)); | |
162 | if (c == EOF) | |
163 | ohshite(_("error reading acknowledgement of program failure message")); | |
164 | return urqr_fail; | |
165 | } | |
166 | ||
167 | static urqresult runscript(const char *exepath, const char *name) { | |
168 | urqresult ur; | |
169 | ||
170 | ur= ensureoptions(); if (ur != urqr_normal) return ur; | |
171 | ur=lockmethod(); if (ur != urqr_normal) return ur; | |
172 | getcurrentopt(); | |
173 | ||
174 | if (coption) { | |
175 | struct command cmd; | |
176 | ||
177 | strcpy(coption->meth->pathinmeth,exepath); | |
178 | ||
179 | command_init(&cmd, coption->meth->path, name); | |
180 | command_add_args(&cmd, exepath, dpkg_db_get_dir(), | |
181 | coption->meth->name, coption->name, nullptr); | |
182 | ur = falliblesubprocess(&cmd); | |
183 | command_destroy(&cmd); | |
184 | } else { | |
185 | sthfailed(_("no access method is selected or configured")); | |
186 | ur= urqr_fail; | |
187 | } | |
188 | pop_cleanup(ehflag_normaltidy); | |
189 | ||
190 | return ur; | |
191 | } | |
192 | ||
193 | urqresult urq_update(void) { | |
194 | return runscript(METHODUPDATESCRIPT,_("update available list script")); | |
195 | } | |
196 | ||
197 | urqresult urq_install(void) { | |
198 | return runscript(METHODINSTALLSCRIPT,_("installation script")); | |
199 | } | |
200 | ||
201 | static urqresult rundpkgauto(const char *name, const char *dpkgmode) { | |
202 | urqresult ur; | |
203 | struct command cmd; | |
204 | ||
205 | command_init(&cmd, DPKG, name); | |
206 | command_add_args(&cmd, DPKG, "--admindir", dpkg_db_get_dir(), "--pending", | |
207 | dpkgmode, nullptr); | |
208 | ||
209 | cursesoff(); | |
210 | printf("running dpkg --pending %s ...\n",dpkgmode); | |
211 | fflush(stdout); | |
212 | ur = falliblesubprocess(&cmd); | |
213 | command_destroy(&cmd); | |
214 | ||
215 | return ur; | |
216 | } | |
217 | ||
218 | urqresult urq_remove(void) { | |
219 | return rundpkgauto("dpkg --remove","--remove"); | |
220 | } | |
221 | ||
222 | urqresult urq_config(void) { | |
223 | return rundpkgauto("dpkg --configure","--configure"); | |
224 | } | |
225 | ||
226 | urqresult urq_setup(void) { | |
227 | quitaction qa; | |
228 | urqresult ur; | |
229 | ||
230 | ur= ensureoptions(); if (ur != urqr_normal) return ur; | |
231 | ur=lockmethod(); if (ur != urqr_normal) return ur; | |
232 | getcurrentopt(); | |
233 | ||
234 | curseson(); | |
235 | methodlist *l= new methodlist(); | |
236 | qa= l->display(); | |
237 | delete l; | |
238 | ||
239 | if (qa == qa_quitchecksave) { | |
240 | struct command cmd; | |
241 | ||
242 | strcpy(coption->meth->pathinmeth,METHODSETUPSCRIPT); | |
243 | ||
244 | command_init(&cmd, coption->meth->path, _("query/setup script")); | |
245 | command_add_args(&cmd, METHODSETUPSCRIPT, dpkg_db_get_dir(), | |
246 | coption->meth->name, coption->name, nullptr); | |
247 | ur = falliblesubprocess(&cmd); | |
248 | command_destroy(&cmd); | |
249 | if (ur == urqr_normal) writecurrentopt(); | |
250 | } else { | |
251 | ur= urqr_fail; | |
252 | } | |
253 | ||
254 | pop_cleanup(ehflag_normaltidy); | |
255 | return ur; | |
256 | } |