extract.c revision 22997 
1#ifndef lint
2static const char *rcsid = "$Id$";
3#endif
4
5/*
6 * FreeBSD install - a package for the installation and maintainance
7 * of non-core utilities.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * Jordan K. Hubbard
19 * 18 July 1993
20 *
21 * This is the package extraction code for the add module.
22 *
23 */
24
25#include "lib.h"
26#include "add.h"
27
28
29#define STARTSTRING "tar cf -"
30#define TOOBIG(str) ((strlen(str) + 6 + strlen(home) + where_count > maxargs) \
31		|| (strlen(str) + 6 + strlen(home) + perm_count > maxargs))
32
33#define PUSHOUT(todir) /* push out string */ \
34	if (strlen(where_args) > sizeof(STARTSTRING)-1) { \
35		    strcat(where_args, "|tar xf - -C "); \
36		    strcat(where_args, todir); \
37		    if (system(where_args)) \
38			barf("can't invoke tar pipeline"); \
39		    strcpy(where_args, STARTSTRING); \
40		    where_count = sizeof(STARTSTRING)-1; \
41	} \
42	if (perm_count) { \
43		    apply_perms(todir, perm_args); \
44		    perm_args[0] = 0;\
45		    perm_count = 0; \
46	}
47
48void
49extract_plist(char *home, Package *pkg)
50{
51    PackingList p = pkg->head;
52    char *last_file;
53    char *where_args, *perm_args, *last_chdir;
54    int maxargs, where_count = 0, perm_count = 0, add_count;
55
56    maxargs = sysconf(_SC_ARG_MAX);
57    maxargs -= 64;			/* some slop for the tar cmd text,
58					   and sh -c */
59    where_args = alloca(maxargs);
60    if (!where_args)
61	barf("can't get argument list space");
62    perm_args = alloca(maxargs);
63    if (!perm_args)
64	barf("can't get argument list space");
65
66    strcpy(where_args, STARTSTRING);
67    where_count = sizeof(STARTSTRING)-1;
68    perm_args[0] = 0;
69
70    last_chdir = 0;
71
72    /* Reset the world */
73    Owner = NULL;
74    Group = NULL;
75    Mode = NULL;
76    last_file = NULL;
77    Directory = home;
78
79    /* Do it */
80    while (p) {
81	char cmd[FILENAME_MAX];
82
83	switch(p->type) {
84	case PLIST_NAME:
85	    PkgName = p->name;
86	    if (Verbose)
87		printf("extract: Package name is %s\n", p->name);
88	    break;
89
90	case PLIST_FILE:
91	    last_file = p->name;
92	    if (Verbose)
93		printf("extract: %s/%s\n", Directory, p->name);
94	    if (!Fake) {
95		char try[FILENAME_MAX];
96
97		/* first try to rename it into place */
98		sprintf(try, "%s/%s", Directory, p->name);
99		if (rename(p->name, try) == 0) {
100		    /* try to add to list of perms to be changed,
101		       and run in bulk. */
102		    if (p->name[0] == '/' || TOOBIG(p->name))
103			PUSHOUT(Directory);
104		    add_count = snprintf(&perm_args[perm_count],
105					 maxargs - perm_count,
106					 "%s ", p->name);
107		    if (add_count > maxargs - perm_count)
108			barf("oops, miscounted strings!");
109		    perm_count += add_count;
110		}
111		else {
112		    /* rename failed, try copying with a big tar command */
113		    if (p->name[0] == '/' || TOOBIG(p->name) ||
114			last_chdir != Directory) {
115			PUSHOUT(last_chdir);
116			last_chdir = Directory;
117		    }
118		    add_count = snprintf(&where_args[where_count],
119					 maxargs - where_count,
120					 " %s", p->name);
121		    if (add_count > maxargs - where_count)
122			barf("oops, miscounted strings!");
123		    where_count += add_count;
124		    add_count = snprintf(&perm_args[perm_count],
125					 maxargs - perm_count,
126					 "%s ", p->name);
127		    if (add_count > maxargs - perm_count)
128			barf("oops, miscounted strings!");
129		    perm_count += add_count;
130		    if (p->name[0] == '/') {
131			PUSHOUT(Directory);
132		    }
133		}
134	    }
135	    break;
136
137	case PLIST_CWD:
138	    if (Verbose)
139		printf("extract: CWD to %s\n", p->name);
140	    PUSHOUT(Directory);
141	    if (strcmp(p->name, ".")) {
142		if (!Fake && make_hierarchy(p->name) == FAIL)
143		    barf("Unable make directory '%s'.", p->name);
144		Directory = p->name;
145	    }
146	    else
147		Directory = home;
148	    break;
149
150	case PLIST_CMD:
151	    format_cmd(cmd, p->name, Directory, last_file);
152	    PUSHOUT(Directory);
153	    if (Verbose)
154		printf("extract: execute '%s'\n", cmd);
155	    if (!Fake && system(cmd))
156		whinge("Command '%s' failed.", cmd);
157	    break;
158
159	case PLIST_CHMOD:
160	    PUSHOUT(Directory);
161	    Mode = p->name;
162	    break;
163
164	case PLIST_CHOWN:
165	    PUSHOUT(Directory);
166	    Owner = p->name;
167	    break;
168
169	case PLIST_CHGRP:
170	    PUSHOUT(Directory);
171	    Group = p->name;
172	    break;
173
174	case PLIST_COMMENT:
175	    break;
176
177	case PLIST_IGNORE:
178	    p = p->next;
179	    break;
180	}
181	p = p->next;
182    }
183    PUSHOUT(Directory);
184}
185