FreeBSD-5.3/usr.sbin/pkg_install/create/pl.c
/*
* 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
*
* Routines for dealing with the packing list.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.sbin/pkg_install/create/pl.c,v 1.27 2004/06/29 19:06:41 eik Exp $");
#include "lib.h"
#include "create.h"
#include <errno.h>
#include <err.h>
#include <md5.h>
/* Add an MD5 checksum entry for a file or link */
void
add_cksum(Package *pkg, PackingList p, const char *fname)
{
char *cp = NULL, buf[33];
if (issymlink(fname)) {
int len;
char lnk[FILENAME_MAX];
if ((len = readlink(fname, lnk, FILENAME_MAX)) > 0)
cp = MD5Data((unsigned char *)lnk, len, buf);
} else if (isfile(fname)) {
/* Don't record MD5 checksum for device nodes and such */
cp = MD5File(fname, buf);
}
if (cp != NULL) {
PackingList tmp = new_plist_entry();
tmp->name = copy_string(strconcat("MD5:", cp));
tmp->type = PLIST_COMMENT;
tmp->next = p->next;
tmp->prev = p;
p->next = tmp;
if (pkg->tail == p)
pkg->tail = tmp;
}
}
/* Check a list for files that require preconversion */
void
check_list(const char *home, Package *pkg)
{
const char *where = home;
const char *there = NULL;
char name[FILENAME_MAX];
PackingList p;
for (p = pkg->head; p != NULL; p = p->next)
switch (p->type) {
case PLIST_CWD:
where = p->name;
break;
case PLIST_IGNORE:
p = p->next;
break;
case PLIST_SRC:
there = p->name;
break;
case PLIST_FILE:
if (there)
snprintf(name, sizeof(name), "%s/%s", there, p->name);
else
snprintf(name, sizeof(name), "%s%s/%s",
BaseDir && where && where[0] == '/' ? BaseDir : "", where, p->name);
add_cksum(pkg, p, name);
break;
default:
break;
}
}
static int
trylink(const char *from, const char *to)
{
if (link(from, to) == 0)
return 0;
if (errno == ENOENT) {
/* try making the container directory */
char *cp = strrchr(to, '/');
if (cp)
vsystem("/bin/mkdir -p %.*s", cp - to,
to);
return link(from, to);
}
return -1;
}
#define STARTSTRING "/usr/bin/tar cf -"
#define TOOBIG(str) (int)strlen(str) + 6 + (int)strlen(home) + where_count > maxargs
#define PUSHOUT() /* push out string */ \
if (where_count > (int)sizeof(STARTSTRING)-1) { \
strcat(where_args, "|/usr/bin/tar xpf -"); \
if (system(where_args)) { \
cleanup(0); \
errx(2, "%s: can't invoke tar pipeline", __func__); \
} \
memset(where_args, 0, maxargs); \
last_chdir = NULL; \
strcpy(where_args, STARTSTRING); \
where_count = sizeof(STARTSTRING)-1; \
}
/*
* Copy unmarked files in packing list to playpen - marked files
* have already been copied in an earlier pass through the list.
*/
void
copy_plist(const char *home, Package *plist)
{
PackingList p = plist->head;
const char *where = home;
const char *there = NULL, *mythere;
char *where_args;
const char *last_chdir, *root = "/";
int maxargs, where_count = 0, add_count;
struct stat stb;
dev_t curdir;
maxargs = sysconf(_SC_ARG_MAX);
maxargs -= 64; /*
* Some slop for the tar cmd text,
* and sh -c
*/
where_args = malloc(maxargs);
if (!where_args) {
cleanup(0);
errx(2, "%s: can't get argument list space", __func__);
}
memset(where_args, 0, maxargs);
strcpy(where_args, STARTSTRING);
where_count = sizeof(STARTSTRING)-1;
last_chdir = 0;
if (stat(".", &stb) == 0)
curdir = stb.st_dev;
else
curdir = (dev_t) -1; /*
* It's ok if this is a valid dev_t;
* this is just a hint for an
* optimization.
*/
while (p) {
if (p->type == PLIST_CWD)
where = p->name;
else if (p->type == PLIST_SRC)
there = p->name;
else if (p->type == PLIST_IGNORE)
p = p->next;
else if (p->type == PLIST_FILE && !p->marked) {
char fn[FILENAME_MAX];
/* First, look for it in the "home" dir */
sprintf(fn, "%s/%s", home, p->name);
if (fexists(fn)) {
if (lstat(fn, &stb) == 0 && stb.st_dev == curdir &&
S_ISREG(stb.st_mode)) {
/*
* If we can link it to the playpen, that avoids a copy
* and saves time.
*/
if (p->name[0] != '/') {
/*
* Don't link abspn stuff--it doesn't come from
* local dir!
*/
if (trylink(fn, p->name) == 0) {
p = p->next;
continue;
}
}
}
if (TOOBIG(fn)) {
PUSHOUT();
}
if (p->name[0] == '/') {
add_count = snprintf(&where_args[where_count],
maxargs - where_count,
" %s %s",
last_chdir == root ? "" : "-C /",
p->name);
last_chdir = root;
} else {
add_count = snprintf(&where_args[where_count],
maxargs - where_count,
" %s%s %s",
last_chdir == home ? "" : "-C ",
last_chdir == home ? "" : home,
p->name);
last_chdir = home;
}
if (add_count < 0 || add_count >= maxargs - where_count) {
cleanup(0);
errx(2, "%s: oops, miscounted strings!", __func__);
}
where_count += add_count;
}
/*
* Otherwise, try along the actual extraction path..
*/
else {
if (p->name[0] == '/')
mythere = root;
else mythere = there;
if (mythere)
snprintf(fn, sizeof(fn), "%s/%s", mythere, p->name);
else
snprintf(fn, sizeof(fn), "%s%s/%s",
BaseDir && where && where[0] == '/' ? BaseDir : "", where, p->name);
if (lstat(fn, &stb) == 0 && stb.st_dev == curdir &&
S_ISREG(stb.st_mode)) {
/*
* If we can link it to the playpen, that avoids a copy
* and saves time.
*/
if (trylink(fn, p->name) == 0) {
p = p->next;
continue;
}
}
if (TOOBIG(p->name)) {
PUSHOUT();
}
if (last_chdir == (mythere ? mythere : where))
add_count = snprintf(&where_args[where_count],
maxargs - where_count,
" %s", p->name);
else
add_count = snprintf(&where_args[where_count],
maxargs - where_count,
" -C %s %s",
mythere ? mythere : where,
p->name);
if (add_count < 0 || add_count >= maxargs - where_count) {
cleanup(0);
errx(2, "%s: oops, miscounted strings!", __func__);
}
where_count += add_count;
last_chdir = (mythere ? mythere : where);
}
}
p = p->next;
}
PUSHOUT();
free(where_args);
}