pkg.c revision 257309 
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 257309 2013-10-29 07:33:53Z 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 <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	snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", packagesite);
172
173	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
174	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
175
176	if ((fd = mkstemp(tmppkg)) == -1) {
177		warn("mkstemp()");
178		return (-1);
179	}
180
181	retry = max_retry;
182
183	u = fetchParseURL(url);
184	while (remote == NULL) {
185		if (retry == max_retry) {
186			if (strcmp(u->scheme, "file") != 0 &&
187			    strcasecmp(mirror_type, "srv") == 0) {
188				snprintf(zone, sizeof(zone),
189				    "_%s._tcp.%s", u->scheme, u->host);
190				mirrors = dns_getsrvinfo(zone);
191				current = mirrors;
192			}
193		}
194
195		if (mirrors != NULL) {
196			strlcpy(u->host, current->host, sizeof(u->host));
197			u->port = current->port;
198		}
199
200		remote = fetchXGet(u, &st, "");
201		if (remote == NULL) {
202			--retry;
203			if (retry <= 0)
204				goto fetchfail;
205			if (mirrors == NULL) {
206				sleep(1);
207			} else {
208				current = current->next;
209				if (current == NULL)
210					current = mirrors;
211			}
212		}
213	}
214
215	if (remote == NULL)
216		goto fetchfail;
217
218	while (done < st.size) {
219		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
220			break;
221
222		if (write(fd, buf, r) != r) {
223			warn("write()");
224			goto cleanup;
225		}
226
227		done += r;
228		now = time(NULL);
229		if (now > last || done == st.size)
230			last = now;
231	}
232
233	if (ferror(remote))
234		goto fetchfail;
235
236	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
237		ret = install_pkg_static(pkgstatic, tmppkg);
238
239	snprintf(conf, MAXPATHLEN, "%s/etc/pkg.conf",
240	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
241
242	if (access(conf, R_OK) == -1) {
243		site = strrchr(url, '/');
244		if (site == NULL)
245			goto cleanup;
246		site[0] = '\0';
247		site = strrchr(url, '/');
248		if (site == NULL)
249			goto cleanup;
250		site[0] = '\0';
251
252		config = fopen(conf, "w+");
253		if (config == NULL)
254			goto cleanup;
255		fprintf(config, "packagesite: %s\n", url);
256		fclose(config);
257	}
258
259	goto cleanup;
260
261fetchfail:
262	warnx("Error fetching %s: %s", url, fetchLastErrString);
263	fprintf(stderr, "A pre-built version of pkg could not be found for your system.\n");
264	fprintf(stderr, "Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.\n");
265
266cleanup:
267	if (remote != NULL)
268		fclose(remote);
269	close(fd);
270	unlink(tmppkg);
271
272	return (ret);
273}
274
275static const char confirmation_message[] =
276"The package management tool is not yet installed on your system.\n"
277"Do you want to fetch and install it now? [y/N]: ";
278
279static int
280pkg_query_yes_no(void)
281{
282	int ret, c;
283
284	c = getchar();
285
286	if (c == 'y' || c == 'Y')
287		ret = 1;
288	else
289		ret = 0;
290
291	while (c != '\n' && c != EOF)
292		c = getchar();
293
294	return (ret);
295}
296
297int
298main(__unused int argc, char *argv[])
299{
300	char pkgpath[MAXPATHLEN];
301	char pkgstatic[MAXPATHLEN];
302	bool yes = false;
303	int fd, ret;
304
305	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
306	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
307
308	if (access(pkgpath, X_OK) == -1) {
309		/*
310		 * To allow 'pkg -N' to be used as a reliable test for whether
311		 * a system is configured to use pkg, don't bootstrap pkg
312		 * when that argument is given as argv[1].
313		 */
314		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
315			errx(EXIT_FAILURE, "pkg is not installed");
316
317		if (argc > 2 && strcmp(argv[1], "add") == 0 &&
318		    access(argv[2], R_OK) == 0) {
319			fd = open(argv[2], O_RDONLY);
320			if (fd == -1)
321				err(EXIT_FAILURE, "Unable to open %s", argv[2]);
322
323			if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
324				ret = install_pkg_static(pkgstatic, argv[2]);
325			close(fd);
326			if (ret != 0)
327				exit(EXIT_FAILURE);
328			exit(EXIT_SUCCESS);
329		}
330		/*
331		 * Do not ask for confirmation if either of stdin or stdout is
332		 * not tty. Check the environment to see if user has answer
333		 * tucked in there already.
334		 */
335		config_init();
336		config_bool(ASSUME_ALWAYS_YES, &yes);
337		if (!yes) {
338			printf("%s", confirmation_message);
339			if (!isatty(fileno(stdin)))
340				exit(EXIT_FAILURE);
341
342			if (pkg_query_yes_no() == 0)
343				exit(EXIT_FAILURE);
344		}
345		if (bootstrap_pkg() != 0)
346			exit(EXIT_FAILURE);
347		config_finish();
348	}
349
350	execv(pkgpath, argv);
351
352	/* NOT REACHED */
353	return (EXIT_FAILURE);
354}
355