pkg.c revision 247841 
1/*-
2 * Copyright (c) 2012-2013 Baptiste Daroussin <bapt@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/usr.sbin/pkg/pkg.c 247841 2013-03-05 13:31:06Z bapt $");
29
30#include <sys/param.h>
31#include <sys/wait.h>
32
33#include <archive.h>
34#include <archive_entry.h>
35#include <err.h>
36#include <errno.h>
37#include <fetch.h>
38#include <paths.h>
39#include <stdbool.h>
40#include <stdlib.h>
41#include <stdio.h>
42#include <string.h>
43#include <time.h>
44#include <unistd.h>
45
46#include "dns_utils.h"
47#include "config.h"
48
49static int
50extract_pkg_static(int fd, char *p, int sz)
51{
52	struct archive *a;
53	struct archive_entry *ae;
54	char *end;
55	int ret, r;
56
57	ret = -1;
58	a = archive_read_new();
59	if (a == NULL) {
60		warn("archive_read_new");
61		return (ret);
62	}
63	archive_read_support_filter_all(a);
64	archive_read_support_format_tar(a);
65
66	if (lseek(fd, 0, 0) == -1) {
67		warn("lseek");
68		goto cleanup;
69	}
70
71	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
72		warnx("archive_read_open_fd: %s", archive_error_string(a));
73		goto cleanup;
74	}
75
76	ae = NULL;
77	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
78		end = strrchr(archive_entry_pathname(ae), '/');
79		if (end == NULL)
80			continue;
81
82		if (strcmp(end, "/pkg-static") == 0) {
83			r = archive_read_extract(a, ae,
84			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
85			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
86			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
87			strlcpy(p, archive_entry_pathname(ae), sz);
88			break;
89		}
90	}
91
92	if (r == ARCHIVE_OK)
93		ret = 0;
94	else
95		warnx("fail to extract pkg-static");
96
97cleanup:
98	archive_read_free(a);
99	return (ret);
100
101}
102
103static int
104install_pkg_static(char *path, char *pkgpath)
105{
106	int pstat;
107	pid_t pid;
108
109	switch ((pid = fork())) {
110	case -1:
111		return (-1);
112	case 0:
113		execl(path, "pkg-static", "add", pkgpath, (char *)NULL);
114		_exit(1);
115	default:
116		break;
117	}
118
119	while (waitpid(pid, &pstat, 0) == -1)
120		if (errno != EINTR)
121			return (-1);
122
123	if (WEXITSTATUS(pstat))
124		return (WEXITSTATUS(pstat));
125	else if (WIFSIGNALED(pstat))
126		return (128 & (WTERMSIG(pstat)));
127	return (pstat);
128}
129
130static int
131bootstrap_pkg(void)
132{
133	struct url *u;
134	FILE *remote;
135	FILE *config;
136	char *site;
137	struct dns_srvinfo *mirrors, *current;
138	/* To store _https._tcp. + hostname + \0 */
139	char zone[MAXHOSTNAMELEN + 13];
140	char url[MAXPATHLEN];
141	char conf[MAXPATHLEN];
142	char tmppkg[MAXPATHLEN];
143	const char *packagesite, *mirror_type;
144	char buf[10240];
145	char pkgstatic[MAXPATHLEN];
146	int fd, retry, ret, max_retry;
147	struct url_stat st;
148	off_t done, r;
149	time_t now;
150	time_t last;
151
152	done = 0;
153	last = 0;
154	max_retry = 3;
155	ret = -1;
156	remote = NULL;
157	config = NULL;
158	current = mirrors = NULL;
159
160	printf("Bootstrapping pkg please wait\n");
161
162	if (config_string(PACKAGESITE, &packagesite) != 0) {
163		warnx("No PACKAGESITE defined");
164		return (-1);
165	}
166	if (config_string(MIRROR_TYPE, &mirror_type) != 0) {
167		warnx("No MIRROR_TYPE defined");
168		return (-1);
169	}
170	snprintf(url, MAXPATHLEN, "%s/latest/Latest/pkg.txz", packagesite);
171
172	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
173	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
174
175	if ((fd = mkstemp(tmppkg)) == -1) {
176		warn("mkstemp()");
177		return (-1);
178	}
179
180	retry = max_retry;
181
182	u = fetchParseURL(url);
183	while (remote == NULL) {
184		if (retry == max_retry) {
185			if (strcmp(u->scheme, "file") != 0 &&
186			    strcasecmp(mirror_type, "srv") == 0) {
187				snprintf(zone, sizeof(zone),
188				    "_%s._tcp.%s", u->scheme, u->host);
189				mirrors = dns_getsrvinfo(zone);
190				current = mirrors;
191			}
192		}
193
194		if (mirrors != NULL)
195			strlcpy(u->host, current->host, sizeof(u->host));
196
197		remote = fetchXGet(u, &st, "");
198		if (remote == NULL) {
199			--retry;
200			if (retry <= 0)
201				goto fetchfail;
202			if (mirrors == NULL) {
203				sleep(1);
204			} else {
205				current = current->next;
206				if (current == NULL)
207					current = mirrors;
208			}
209		}
210	}
211
212	if (remote == NULL)
213		goto fetchfail;
214
215	while (done < st.size) {
216		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
217			break;
218
219		if (write(fd, buf, r) != r) {
220			warn("write()");
221			goto cleanup;
222		}
223
224		done += r;
225		now = time(NULL);
226		if (now > last || done == st.size)
227			last = now;
228	}
229
230	if (ferror(remote))
231		goto fetchfail;
232
233	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
234		ret = install_pkg_static(pkgstatic, tmppkg);
235
236	snprintf(conf, MAXPATHLEN, "%s/etc/pkg.conf",
237	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
238
239	if (access(conf, R_OK) == -1) {
240		site = strrchr(url, '/');
241		if (site == NULL)
242			goto cleanup;
243		site[0] = '\0';
244		site = strrchr(url, '/');
245		if (site == NULL)
246			goto cleanup;
247		site[0] = '\0';
248
249		config = fopen(conf, "w+");
250		if (config == NULL)
251			goto cleanup;
252		fprintf(config, "packagesite: %s\n", url);
253		fclose(config);
254	}
255
256	goto cleanup;
257
258fetchfail:
259	warnx("Error fetching %s: %s", url, fetchLastErrString);
260	fprintf(stderr, "A pre-built version of pkg could not be found for your system.\n");
261	fprintf(stderr, "Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.\n");
262
263cleanup:
264	if (remote != NULL)
265		fclose(remote);
266	close(fd);
267	unlink(tmppkg);
268
269	return (ret);
270}
271
272static const char confirmation_message[] =
273"The package management tool is not yet installed on your system.\n"
274"Do you want to fetch and install it now? [y/N]: ";
275
276static int
277pkg_query_yes_no(void)
278{
279	int ret, c;
280
281	c = getchar();
282
283	if (c == 'y' || c == 'Y')
284		ret = 1;
285	else
286		ret = 0;
287
288	while (c != '\n' && c != EOF)
289		c = getchar();
290
291	return (ret);
292}
293
294int
295main(__unused int argc, char *argv[])
296{
297	char pkgpath[MAXPATHLEN];
298	bool yes = false;
299
300	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
301	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
302
303	if (access(pkgpath, X_OK) == -1) {
304		/*
305		 * To allow 'pkg -N' to be used as a reliable test for whether
306		 * a system is configured to use pkg, don't bootstrap pkg
307		 * when that argument is given as argv[1].
308		 */
309		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
310			errx(EXIT_FAILURE, "pkg is not installed");
311
312		/*
313		 * Do not ask for confirmation if either of stdin or stdout is
314		 * not tty. Check the environment to see if user has answer
315		 * tucked in there already.
316		 */
317		config_init();
318		config_bool(ASSUME_ALWAYS_YES, &yes);
319		if (!yes) {
320			printf("%s", confirmation_message);
321			if (!isatty(fileno(stdin)))
322				exit(EXIT_FAILURE);
323
324			if (pkg_query_yes_no() == 0)
325				exit(EXIT_FAILURE);
326		}
327		if (bootstrap_pkg() != 0)
328			exit(EXIT_FAILURE);
329		config_finish();
330	}
331
332	execv(pkgpath, argv);
333
334	/* NOT REACHED */
335	return (EXIT_FAILURE);
336}
337