1 /*
2 * FreeBSD install - a package for the installation and maintenance
3 * of non-core utilities.
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 * Maxim Sobolev
15 * 14 March 2001
16 *
17 * Routines used to do various operations with dependencies
18 * among installed packages.
19 *
20 */
21
22 #include <sys/cdefs.h>
23 __FBSDID("$FreeBSD$");
24
25 #include "lib.h"
26 #include <err.h>
27 #include <stdio.h>
28
29 void list_deps(const char *pkgname, char **pkgs, char *listed,
30 char *check_loop, char **newpkgs, int *nrnewpkgs,
31 int *err_cnt);
32
33 /*
34 * Sort given NULL-terminated list of installed packages (pkgs) in
35 * such a way that if package A depends on package B then after
36 * sorting A will be listed before B no matter how they were
37 * originally positioned in the list.
38 *
39 * Works by performing a recursive depth-first search on the
40 * required-by lists.
41 */
42
43 int
sortdeps(char ** pkgs)44 sortdeps(char **pkgs)
45 {
46 int i, err_cnt=0;
47 int nrpkgs, nrnewpkgs;
48 char *listed, *check_loop, **newpkgs;
49 char *cp;
50
51 if (pkgs[0] == NULL || pkgs[1] == NULL)
52 return (0);
53
54 nrpkgs = 0;
55 while (pkgs[nrpkgs]) nrpkgs++;
56 listed = alloca(nrpkgs);
57 if (listed == NULL) {
58 warnx("%s(): alloca() failed", __func__);
59 return 1;
60 }
61 bzero(listed,nrpkgs);
62 check_loop = alloca(nrpkgs);
63 if (check_loop == NULL) {
64 warnx("%s(): alloca() failed", __func__);
65 return 1;
66 }
67 bzero(check_loop,nrpkgs);
68 newpkgs = alloca(nrpkgs*sizeof(char*));
69 if (newpkgs == NULL) {
70 warnx("%s(): alloca() failed", __func__);
71 return 1;
72 }
73 nrnewpkgs = 0;
74
75 for (i = 0; pkgs[i]; i++) if (!listed[i]) {
76 check_loop[i] = 1;
77 cp = strchr(pkgs[i], ':');
78 if (cp != NULL)
79 *cp = '\0';
80 list_deps(pkgs[i],pkgs,listed,check_loop,newpkgs,&nrnewpkgs,&err_cnt);
81 if (cp != NULL)
82 *cp = ':';
83 listed[i] = 1;
84 newpkgs[nrnewpkgs] = pkgs[i];
85 nrnewpkgs++;
86 }
87
88 if (nrnewpkgs != nrpkgs) {
89 fprintf(stderr,"This shouldn't happen, and indicates a huge error in the code.\n");
90 exit(1);
91 }
92 for (i = 0; i < nrnewpkgs; i++) pkgs[i] = newpkgs[i];
93
94 return err_cnt;
95 }
96
97 /*
98 * This recursive function lists the dependencies (that is, the
99 * "required-by"s) for pkgname, putting them into newpkgs.
100 */
101
list_deps(const char * pkgname,char ** pkgs,char * listed,char * check_loop,char ** newpkgs,int * nrnewpkgs,int * err_cnt)102 void list_deps(const char *pkgname, char **pkgs, char *listed,
103 char *check_loop, char **newpkgs, int *nrnewpkgs,
104 int *err_cnt) {
105 char **rb, **rbtmp;
106 char *cp;
107 int errcode, i, j;
108 struct reqr_by_entry *rb_entry;
109 struct reqr_by_head *rb_list;
110
111 if (isinstalledpkg(pkgname) <= 0)
112 return;
113
114 errcode = requiredby(pkgname, &rb_list, FALSE, TRUE);
115 if (errcode < 0)
116 return;
117 /*
118 * We put rb_list into an argv style NULL terminated list,
119 * because requiredby uses some static storage, and list_deps
120 * is a recursive function.
121 */
122
123 rbtmp = rb = alloca((errcode + 1) * sizeof(*rb));
124 if (rb == NULL) {
125 warnx("%s(): alloca() failed", __func__);
126 (*err_cnt)++;
127 return;
128 }
129 STAILQ_FOREACH(rb_entry, rb_list, link) {
130 *rbtmp = alloca(strlen(rb_entry->pkgname) + 1);
131 if (*rbtmp == NULL) {
132 warnx("%s(): alloca() failed", __func__);
133 (*err_cnt)++;
134 return;
135 }
136 strcpy(*rbtmp, rb_entry->pkgname);
137 rbtmp++;
138 }
139 *rbtmp = NULL;
140
141 for (i = 0; rb[i]; i++)
142 for (j = 0; pkgs[j]; j++) if (!listed[j]) {
143 cp = strchr(pkgs[j], ':');
144 if (cp != NULL)
145 *cp = '\0';
146 if (strcmp(rb[i], pkgs[j]) == 0) { /*match */
147 /*
148 * Try to avoid deadlock if package A depends on B which in
149 * turn depends on C and C due to an error depends on A.
150 * It Should Never Happen[tm] in real life.
151 */
152 if (check_loop[j]) {
153 warnx("dependency loop detected for package %s", pkgs[j]);
154 (*err_cnt)++;
155 }
156 else {
157 check_loop[j] = 1;
158 list_deps(pkgs[j],pkgs,listed,check_loop,newpkgs,nrnewpkgs,err_cnt);
159 listed[j] = 1;
160 newpkgs[*nrnewpkgs] = pkgs[j];
161 (*nrnewpkgs)++;
162 }
163 }
164 if (cp != NULL)
165 *cp = ':';
166 }
167 }
168
169 /*
170 * Load +REQUIRED_BY file and return a list with names of
171 * packages that require package referred to by `pkgname'.
172 *
173 * Optionally check that packages listed there are actually
174 * installed and filter out those that don't (filter == TRUE).
175 *
176 * strict argument controls whether the caller want warnings
177 * to be emitted when there are some non-fatal conditions,
178 * i.e. package doesn't have +REQUIRED_BY file or some packages
179 * listed in +REQUIRED_BY don't exist.
180 *
181 * Result returned in the **list, while return value is equal
182 * to the number of entries in the resulting list. Print error
183 * message and return -1 on error.
184 */
185 int
requiredby(const char * pkgname,struct reqr_by_head ** list,Boolean strict,Boolean filter)186 requiredby(const char *pkgname, struct reqr_by_head **list, Boolean strict, Boolean filter)
187 {
188 FILE *fp;
189 char fbuf[FILENAME_MAX], fname[FILENAME_MAX];
190 int retval;
191 struct reqr_by_entry *rb_entry;
192 static struct reqr_by_head rb_list = STAILQ_HEAD_INITIALIZER(rb_list);
193
194 *list = &rb_list;
195 /* Deallocate any previously allocated space */
196 while (!STAILQ_EMPTY(&rb_list)) {
197 rb_entry = STAILQ_FIRST(&rb_list);
198 STAILQ_REMOVE_HEAD(&rb_list, link);
199 free(rb_entry);
200 }
201
202 if (isinstalledpkg(pkgname) <= 0) {
203 if (strict == TRUE)
204 warnx("no such package '%s' installed", pkgname);
205 return -1;
206 }
207
208 snprintf(fname, sizeof(fname), "%s/%s/%s", LOG_DIR, pkgname,
209 REQUIRED_BY_FNAME);
210 fp = fopen(fname, "r");
211 if (fp == NULL) {
212 /* Probably pkgname doesn't have any packages that depend on it */
213 if (strict == TRUE)
214 warnx("couldn't open dependency file '%s'", fname);
215 return 0;
216 }
217
218 retval = 0;
219 while (fgets(fbuf, sizeof(fbuf), fp) != NULL) {
220 if (fbuf[strlen(fbuf) - 1] == '\n')
221 fbuf[strlen(fbuf) - 1] = '\0';
222 if (filter == TRUE && isinstalledpkg(fbuf) <= 0) {
223 if (strict == TRUE)
224 warnx("package '%s' is recorded in the '%s' but isn't "
225 "actually installed", fbuf, fname);
226 continue;
227 }
228 retval++;
229 rb_entry = malloc(sizeof(*rb_entry));
230 if (rb_entry == NULL) {
231 warnx("%s(): malloc() failed", __func__);
232 retval = -1;
233 break;
234 }
235 strlcpy(rb_entry->pkgname, fbuf, sizeof(rb_entry->pkgname));
236 STAILQ_INSERT_TAIL(&rb_list, rb_entry, link);
237 }
238 fclose(fp);
239
240 return retval;
241 }
242