pkg.c revision 257328 
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: stable/10/usr.sbin/pkg/pkg.c 257328 2013-10-29 12:25:22Z bdrewery $");
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 <fcntl.h>
38#include <fetch.h>
39#include <paths.h>
40#include <stdbool.h>
41#include <stdlib.h>
42#include <stdio.h>
43#include <string.h>
44#include <time.h>
45#include <unistd.h>
46
47#include "dns_utils.h"
48#include "config.h"
49
50static int
51extract_pkg_static(int fd, char *p, int sz)
52{
53	struct archive *a;
54	struct archive_entry *ae;
55	char *end;
56	int ret, r;
57
58	ret = -1;
59	a = archive_read_new();
60	if (a == NULL) {
61		warn("archive_read_new");
62		return (ret);
63	}
64	archive_read_support_filter_all(a);
65	archive_read_support_format_tar(a);
66
67	if (lseek(fd, 0, 0) == -1) {
68		warn("lseek");
69		goto cleanup;
70	}
71
72	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
73		warnx("archive_read_open_fd: %s", archive_error_string(a));
74		goto cleanup;
75	}
76
77	ae = NULL;
78	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
79		end = strrchr(archive_entry_pathname(ae), '/');
80		if (end == NULL)
81			continue;
82
83		if (strcmp(end, "/pkg-static") == 0) {
84			r = archive_read_extract(a, ae,
85			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
86			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
87			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
88			strlcpy(p, archive_entry_pathname(ae), sz);
89			break;
90		}
91	}
92
93	if (r == ARCHIVE_OK)
94		ret = 0;
95	else
96		warnx("fail to extract pkg-static");
97
98cleanup:
99	archive_read_free(a);
100	return (ret);
101
102}
103
104static int
105install_pkg_static(char *path, char *pkgpath)
106{
107	int pstat;
108	pid_t pid;
109
110	switch ((pid = fork())) {
111	case -1:
112		return (-1);
113	case 0:
114		execl(path, "pkg-static", "add", pkgpath, (char *)NULL);
115		_exit(1);
116	default:
117		break;
118	}
119
120	while (waitpid(pid, &pstat, 0) == -1)
121		if (errno != EINTR)
122			return (-1);
123
124	if (WEXITSTATUS(pstat))
125		return (WEXITSTATUS(pstat));
126	else if (WIFSIGNALED(pstat))
127		return (128 & (WTERMSIG(pstat)));
128	return (pstat);
129}
130
131static int
132bootstrap_pkg(void)
133{
134	struct url *u;
135	FILE *remote;
136	FILE *config;
137	char *site;
138	struct dns_srvinfo *mirrors, *current;
139	/* To store _https._tcp. + hostname + \0 */
140	char zone[MAXHOSTNAMELEN + 13];
141	char url[MAXPATHLEN];
142	char conf[MAXPATHLEN];
143	char tmppkg[MAXPATHLEN];
144	const char *packagesite, *mirror_type;
145	char buf[10240];
146	char pkgstatic[MAXPATHLEN];
147	int fd, retry, ret, max_retry;
148	struct url_stat st;
149	off_t done, r;
150	time_t now;
151	time_t last;
152
153	done = 0;
154	last = 0;
155	max_retry = 3;
156	ret = -1;
157	remote = NULL;
158	config = NULL;
159	current = mirrors = NULL;
160
161	printf("Bootstrapping pkg please wait\n");
162
163	if (config_string(PACKAGESITE, &packagesite) != 0) {
164		warnx("No PACKAGESITE defined");
165		return (-1);
166	}
167	if (config_string(MIRROR_TYPE, &mirror_type) != 0) {
168		warnx("No MIRROR_TYPE defined");
169		return (-1);
170	}
171
172	/* Support pkg+http:// for PACKAGESITE which is the new format
173	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
174	   no A record. */
175	if (strncmp(URL_SCHEME_PREFIX, packagesite,
176	    strlen(URL_SCHEME_PREFIX)) == 0)
177		packagesite += strlen(URL_SCHEME_PREFIX);
178	snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", packagesite);
179
180	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
181	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
182
183	if ((fd = mkstemp(tmppkg)) == -1) {
184		warn("mkstemp()");
185		return (-1);
186	}
187
188	retry = max_retry;
189
190	u = fetchParseURL(url);
191	while (remote == NULL) {
192		if (retry == max_retry) {
193			if (strcmp(u->scheme, "file") != 0 &&
194			    strcasecmp(mirror_type, "srv") == 0) {
195				snprintf(zone, sizeof(zone),
196				    "_%s._tcp.%s", u->scheme, u->host);
197				mirrors = dns_getsrvinfo(zone);
198				current = mirrors;
199			}
200		}
201
202		if (mirrors != NULL) {
203			strlcpy(u->host, current->host, sizeof(u->host));
204			u->port = current->port;
205		}
206
207		remote = fetchXGet(u, &st, "");
208		if (remote == NULL) {
209			--retry;
210			if (retry <= 0)
211				goto fetchfail;
212			if (mirrors == NULL) {
213				sleep(1);
214			} else {
215				current = current->next;
216				if (current == NULL)
217					current = mirrors;
218			}
219		}
220	}
221
222	if (remote == NULL)
223		goto fetchfail;
224
225	while (done < st.size) {
226		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
227			break;
228
229		if (write(fd, buf, r) != r) {
230			warn("write()");
231			goto cleanup;
232		}
233
234		done += r;
235		now = time(NULL);
236		if (now > last || done == st.size)
237			last = now;
238	}
239
240	if (ferror(remote))
241		goto fetchfail;
242
243	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
244		ret = install_pkg_static(pkgstatic, tmppkg);
245
246	snprintf(conf, MAXPATHLEN, "%s/etc/pkg.conf",
247	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
248
249	if (access(conf, R_OK) == -1) {
250		site = strrchr(url, '/');
251		if (site == NULL)
252			goto cleanup;
253		site[0] = '\0';
254		site = strrchr(url, '/');
255		if (site == NULL)
256			goto cleanup;
257		site[0] = '\0';
258
259		config = fopen(conf, "w+");
260		if (config == NULL)
261			goto cleanup;
262		fprintf(config, "packagesite: %s\n", url);
263		fclose(config);
264	}
265
266	goto cleanup;
267
268fetchfail:
269	warnx("Error fetching %s: %s", url, fetchLastErrString);
270	fprintf(stderr, "A pre-built version of pkg could not be found for your system.\n");
271	fprintf(stderr, "Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.\n");
272
273cleanup:
274	if (remote != NULL)
275		fclose(remote);
276	close(fd);
277	unlink(tmppkg);
278
279	return (ret);
280}
281
282static const char confirmation_message[] =
283"The package management tool is not yet installed on your system.\n"
284"Do you want to fetch and install it now? [y/N]: ";
285
286static int
287pkg_query_yes_no(void)
288{
289	int ret, c;
290
291	c = getchar();
292
293	if (c == 'y' || c == 'Y')
294		ret = 1;
295	else
296		ret = 0;
297
298	while (c != '\n' && c != EOF)
299		c = getchar();
300
301	return (ret);
302}
303
304int
305main(__unused int argc, char *argv[])
306{
307	char pkgpath[MAXPATHLEN];
308	char pkgstatic[MAXPATHLEN];
309	bool yes = false;
310	int fd, ret;
311
312	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
313	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
314
315	if (access(pkgpath, X_OK) == -1) {
316		/*
317		 * To allow 'pkg -N' to be used as a reliable test for whether
318		 * a system is configured to use pkg, don't bootstrap pkg
319		 * when that argument is given as argv[1].
320		 */
321		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
322			errx(EXIT_FAILURE, "pkg is not installed");
323
324		if (argc > 2 && strcmp(argv[1], "add") == 0 &&
325		    access(argv[2], R_OK) == 0) {
326			fd = open(argv[2], O_RDONLY);
327			if (fd == -1)
328				err(EXIT_FAILURE, "Unable to open %s", argv[2]);
329
330			if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
331				ret = install_pkg_static(pkgstatic, argv[2]);
332			close(fd);
333			if (ret != 0)
334				exit(EXIT_FAILURE);
335			exit(EXIT_SUCCESS);
336		}
337		/*
338		 * Do not ask for confirmation if either of stdin or stdout is
339		 * not tty. Check the environment to see if user has answer
340		 * tucked in there already.
341		 */
342		config_init();
343		config_bool(ASSUME_ALWAYS_YES, &yes);
344		if (!yes) {
345			printf("%s", confirmation_message);
346			if (!isatty(fileno(stdin)))
347				exit(EXIT_FAILURE);
348
349			if (pkg_query_yes_no() == 0)
350				exit(EXIT_FAILURE);
351		}
352		if (bootstrap_pkg() != 0)
353			exit(EXIT_FAILURE);
354		config_finish();
355	}
356
357	execv(pkgpath, argv);
358
359	/* NOT REACHED */
360	return (EXIT_FAILURE);
361}
362