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/* $OpenBSD: extract.c,v 1.12 2001/04/08 16:45:46 espie Exp $ */
#ifndef lint
static const char *rcsid = "$OpenBSD: extract.c,v 1.12 2001/04/08 16:45:46 espie Exp $";
#endif
/*
* FreeBSD install - a package for the installation and maintainance
* of non-core utilities.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Jordan K. Hubbard
* 18 July 1993
*
* This is the package extraction code for the add module.
*
*/
#include <err.h>
#include "lib.h"
#include "add.h"
#define STARTSTRING "tar cf - "
#define TOOBIG(str) ((strlen(str) + FILENAME_MAX + where_count > maxargs) \
|| (strlen(str) + FILENAME_MAX + perm_count > maxargs))
#define PUSHOUT(todir) /* push out string */ \
if (where_count > sizeof(STARTSTRING)-1) { \
strcat(where_args, "|tar xpf - -C "); \
strcat(where_args, todir); \
if (system(where_args)) { \
cleanup(0); \
errx(2, "can not invoke %lu byte tar pipeline: %s", \
(u_long)strlen(where_args), where_args); \
} \
strcpy(where_args, STARTSTRING); \
where_count = sizeof(STARTSTRING)-1; \
} \
if (perm_count) { \
apply_perms(todir, perm_args); \
perm_args[0] = 0; \
perm_count = 0; \
}
static void
rollback(char *name, char *home, plist_t *start, plist_t *stop)
{
plist_t *q;
char try[FILENAME_MAX], bup[FILENAME_MAX], *dir;
dir = home;
for (q = start; q != stop; q = q->next) {
if (q->type == PLIST_FILE) {
snprintf(try, FILENAME_MAX, "%s/%s", dir, q->name);
if (make_preserve_name(bup, FILENAME_MAX, name, try) && fexists(bup)) {
(void)chflags(try, 0);
(void)unlink(try);
if (rename(bup, try))
pwarnx("rollback: unable to rename %s back to %s", bup, try);
}
}
else if (q->type == PLIST_CWD) {
if (strcmp(q->name, "."))
dir = q->name;
else
dir = home;
}
}
}
static int
preserve(const char *fname)
{
char copy[FILENAME_MAX];
int i;
for (i = 0; i < 50; i++) {
snprintf(copy, sizeof(copy), "%s-%d", fname, i);
if (fexists(copy))
continue;
if (rename(fname, copy) == 0) {
pwarnx("conflict: renamed existing %s to %s", fname, copy);
return 0;
}
}
return -1;
}
void
extract_plist(char *home, package_t *pkg)
{
plist_t *p = pkg->head;
char *last_file;
char *where_args, *perm_args, *last_chdir;
int maxargs, where_count = 0, perm_count = 0, add_count;
maxargs = sysconf(_SC_ARG_MAX) / 2; /* Just use half the argument space */
where_args = alloca(maxargs);
if (!where_args) {
cleanup(0);
errx(2, "can't get argument list space");
}
perm_args = alloca(maxargs);
if (!perm_args) {
cleanup(0);
errx(2, "can't get argument list space");
}
strcpy(where_args, STARTSTRING);
where_count = sizeof(STARTSTRING)-1;
perm_args[0] = 0;
last_chdir = 0;
/* Reset the world */
Owner = NULL;
Group = NULL;
Mode = NULL;
last_file = NULL;
Directory = home;
/* Do it */
while (p) {
char cmd[FILENAME_MAX];
switch(p->type) {
case PLIST_NAME:
PkgName = p->name;
if (Verbose)
printf("extract: Package name is %s\n", p->name);
break;
case PLIST_FILE:
last_file = p->name;
if (Verbose)
printf("extract: %s/%s\n", Directory, p->name);
if (!Fake) {
char try[FILENAME_MAX];
if (strrchr(p->name,'\'')) {
cleanup(0);
errx(2, "Bogus filename \"%s\"", p->name);
}
/* first try to rename it into place */
snprintf(try, FILENAME_MAX, "%s/%s", Directory, p->name);
if (fexists(try)) {
if (preserve(try) == -1) {
pwarnx("unable to back up %s, aborting pkg_add", try);
rollback(PkgName, home, pkg->head, p);
return;
}
}
if (rename(p->name, try) == 0) {
/* try to add to list of perms to be changed and run in bulk. */
if (p->name[0] == '/' || TOOBIG(p->name)) {
PUSHOUT(Directory);
}
add_count = snprintf(&perm_args[perm_count], maxargs - perm_count, "'%s' ", p->name);
if (add_count > maxargs - perm_count) {
cleanup(0);
errx(2, "oops, miscounted strings!");
}
perm_count += add_count;
} else {
/* rename failed, try copying with a big tar command */
if (last_chdir != Directory) {
PUSHOUT(last_chdir);
last_chdir = Directory;
}
else if (p->name[0] == '/' || TOOBIG(p->name)) {
PUSHOUT(Directory);
}
add_count = snprintf(&where_args[where_count], maxargs - where_count, " '%s'", p->name);
if (add_count > maxargs - where_count) {
cleanup(0);
errx(2, "oops, miscounted strings!");
}
where_count += add_count;
add_count = snprintf(&perm_args[perm_count],
maxargs - perm_count,
"'%s' ", p->name);
if (add_count > maxargs - perm_count) {
cleanup(0);
errx(2, "oops, miscounted strings!");
}
perm_count += add_count;
}
}
break;
case PLIST_CWD:
if (Verbose)
printf("extract: CWD to %s\n", p->name);
PUSHOUT(Directory);
if (strcmp(p->name, ".")) {
if (!Fake && make_hierarchy(p->name) == FAIL) {
cleanup(0);
errx(2, "unable to make directory '%s'", p->name);
}
Directory = p->name;
} else
Directory = home;
break;
case PLIST_CMD:
if (!format_cmd(cmd, sizeof(cmd), p->name, Directory, last_file)) {
cleanup(0);
if (last_file == NULL)
errx(2, "no last file specified for '%s' command", p->name);
else
errx(2, "'%s' command could not expand", p->name);
}
PUSHOUT(Directory);
if (Verbose)
printf("extract: execute '%s'\n", cmd);
if (!Fake && system(cmd))
pwarnx("command '%s' failed", cmd);
break;
case PLIST_CHMOD:
PUSHOUT(Directory);
Mode = p->name;
break;
case PLIST_CHOWN:
PUSHOUT(Directory);
Owner = p->name;
break;
case PLIST_CHGRP:
PUSHOUT(Directory);
Group = p->name;
break;
case PLIST_COMMENT:
break;
case PLIST_IGNORE:
p = p->next;
break;
default:
break;
}
p = p->next;
}
PUSHOUT(Directory);
}
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