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/*
* dpkg - main program for package management
* filesdb.c - management of database of files installed on system
*
* Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
* Copyright © 2000,2001 Wichert Akkerman <wakkerma@debian.org>
* Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#ifdef HAVE_LINUX_FIEMAP_H
#include <linux/fiemap.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <sys/vfs.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <dpkg/i18n.h>
#include <dpkg/dpkg.h>
#include <dpkg/dpkg-db.h>
#include <dpkg/string.h>
#include <dpkg/path.h>
#include <dpkg/dir.h>
#include <dpkg/fdio.h>
#include <dpkg/pkg-array.h>
#include <dpkg/progress.h>
#include "filesdb.h"
#include "infodb.h"
#include "main.h"
/*** filepackages support for tracking packages owning a file. ***/
struct filepackages_iterator {
struct pkg_list *pkg_node;
};
struct filepackages_iterator *
filepackages_iter_new(struct filenamenode *fnn)
{
struct filepackages_iterator *iter;
iter = m_malloc(sizeof(*iter));
iter->pkg_node = fnn->packages;
return iter;
}
struct pkginfo *
filepackages_iter_next(struct filepackages_iterator *iter)
{
struct pkg_list *pkg_node;
if (iter->pkg_node == NULL)
return NULL;
pkg_node = iter->pkg_node;
iter->pkg_node = pkg_node->next;
return pkg_node->pkg;
}
void
filepackages_iter_free(struct filepackages_iterator *iter)
{
free(iter);
}
/*** Generic data structures and routines. ***/
static bool allpackagesdone = false;
static int nfiles= 0;
void
ensure_package_clientdata(struct pkginfo *pkg)
{
if (pkg->clientdata)
return;
pkg->clientdata = nfmalloc(sizeof(struct perpackagestate));
pkg->clientdata->istobe = PKG_ISTOBE_NORMAL;
pkg->clientdata->color = PKG_CYCLE_WHITE;
pkg->clientdata->fileslistvalid = false;
pkg->clientdata->files = NULL;
pkg->clientdata->replacingfilesandsaid = 0;
pkg->clientdata->listfile_phys_offs = 0;
pkg->clientdata->trigprocdeferred = NULL;
}
void note_must_reread_files_inpackage(struct pkginfo *pkg) {
allpackagesdone = false;
ensure_package_clientdata(pkg);
pkg->clientdata->fileslistvalid = false;
}
enum pkg_filesdb_load_status {
PKG_FILESDB_LOAD_NONE = 0,
PKG_FILESDB_LOAD_INPROGRESS = 1,
PKG_FILESDB_LOAD_DONE = 2,
};
static enum pkg_filesdb_load_status saidread = PKG_FILESDB_LOAD_NONE;
/**
* Erase the files saved in pkg.
*/
static void
pkg_files_blank(struct pkginfo *pkg)
{
struct fileinlist *current;
/* Anything to empty? */
if (!pkg->clientdata)
return;
for (current= pkg->clientdata->files;
current;
current= current->next) {
struct pkg_list *pkg_node, *pkg_prev = NULL;
/* For each file that used to be in the package,
* go through looking for this package's entry in the list
* of packages containing this file, and blank it out. */
for (pkg_node = current->namenode->packages;
pkg_node;
pkg_node = pkg_node->next) {
if (pkg_node->pkg == pkg) {
if (pkg_prev)
pkg_prev->next = pkg_node->next;
else
current->namenode->packages = pkg_node->next;
/* The actual filelist links were allocated using nfmalloc, so
* we shouldn't free them. */
break;
}
pkg_prev = pkg_node;
}
}
pkg->clientdata->files = NULL;
}
static struct fileinlist **
pkg_files_add_file(struct pkginfo *pkg, struct filenamenode *namenode,
struct fileinlist **file_tail)
{
struct fileinlist *newent;
struct pkg_list *pkg_node;
ensure_package_clientdata(pkg);
if (file_tail == NULL)
file_tail = &pkg->clientdata->files;
/* Make sure we're at the end. */
while ((*file_tail) != NULL) {
file_tail = &((*file_tail)->next);
}
/* Create a new node. */
newent = nfmalloc(sizeof(struct fileinlist));
newent->namenode = namenode;
newent->next = NULL;
*file_tail = newent;
file_tail = &newent->next;
/* Add pkg to newent's package list. */
pkg_node = nfmalloc(sizeof(*pkg_node));
pkg_node->pkg = pkg;
pkg_node->next = newent->namenode->packages;
newent->namenode->packages = pkg_node;
/* Return the position for the next guy. */
return file_tail;
}
/**
* Load the list of files in this package into memory, or update the
* list if it is there but stale.
*/
void
ensure_packagefiles_available(struct pkginfo *pkg)
{
static int fd;
const char *filelistfile;
struct fileinlist **lendp;
struct stat stat_buf;
char *loaded_list, *loaded_list_end, *thisline, *nextline, *ptr;
if (pkg->clientdata && pkg->clientdata->fileslistvalid)
return;
ensure_package_clientdata(pkg);
/* Throw away any stale data, if there was any. */
pkg_files_blank(pkg);
/* Packages which aren't installed don't have a files list. */
if (pkg->status == PKG_STAT_NOTINSTALLED) {
pkg->clientdata->fileslistvalid = true;
return;
}
filelistfile = pkg_infodb_get_file(pkg, &pkg->installed, LISTFILE);
onerr_abort++;
fd= open(filelistfile,O_RDONLY);
if (fd==-1) {
if (errno != ENOENT)
ohshite(_("unable to open files list file for package `%.250s'"),
pkg_name(pkg, pnaw_nonambig));
onerr_abort--;
if (pkg->status != PKG_STAT_CONFIGFILES &&
dpkg_version_is_informative(&pkg->configversion)) {
warning(_("files list file for package '%.250s' missing; assuming "
"package has no files currently installed"),
pkg_name(pkg, pnaw_nonambig));
}
pkg->clientdata->files = NULL;
pkg->clientdata->fileslistvalid = true;
return;
}
push_cleanup(cu_closefd, ehflag_bombout, NULL, 0, 1, &fd);
if (fstat(fd, &stat_buf))
ohshite(_("unable to stat files list file for package '%.250s'"),
pkg_name(pkg, pnaw_nonambig));
if (!S_ISREG(stat_buf.st_mode))
ohshit(_("files list for package '%.250s' is not a regular file"),
pkg_name(pkg, pnaw_nonambig));
if (stat_buf.st_size) {
loaded_list = nfmalloc(stat_buf.st_size);
loaded_list_end = loaded_list + stat_buf.st_size;
if (fd_read(fd, loaded_list, stat_buf.st_size) < 0)
ohshite(_("reading files list for package '%.250s'"),
pkg_name(pkg, pnaw_nonambig));
lendp= &pkg->clientdata->files;
thisline = loaded_list;
while (thisline < loaded_list_end) {
struct filenamenode *namenode;
ptr = memchr(thisline, '\n', loaded_list_end - thisline);
if (ptr == NULL)
ohshit(_("files list file for package '%.250s' is missing final newline"),
pkg_name(pkg, pnaw_nonambig));
/* Where to start next time around. */
nextline = ptr + 1;
/* Strip trailing ‘/’. */
if (ptr > thisline && ptr[-1] == '/') ptr--;
/* Add the file to the list. */
if (ptr == thisline)
ohshit(_("files list file for package `%.250s' contains empty filename"),
pkg_name(pkg, pnaw_nonambig));
*ptr = '\0';
namenode = findnamenode(thisline, fnn_nocopy);
lendp = pkg_files_add_file(pkg, namenode, lendp);
thisline = nextline;
}
}
pop_cleanup(ehflag_normaltidy); /* fd = open() */
if (close(fd))
ohshite(_("error closing files list file for package `%.250s'"),
pkg_name(pkg, pnaw_nonambig));
onerr_abort--;
pkg->clientdata->fileslistvalid = true;
}
#if defined(HAVE_LINUX_FIEMAP_H)
static int
pkg_sorter_by_listfile_phys_offs(const void *a, const void *b)
{
const struct pkginfo *pa = *(const struct pkginfo **)a;
const struct pkginfo *pb = *(const struct pkginfo **)b;
/* We can't simply subtract, because the difference may be greater than
* INT_MAX. */
if (pa->clientdata->listfile_phys_offs < pb->clientdata->listfile_phys_offs)
return -1;
else
return 1;
}
static void
pkg_files_optimize_load(struct pkg_array *array)
{
struct statfs fs;
int i;
/* Get the filesystem block size. */
if (statfs(pkg_infodb_get_dir(), &fs) < 0)
return;
/* Sort packages by the physical location of their list files, so that
* scanning them later will minimize disk drive head movements. */
for (i = 0; i < array->n_pkgs; i++) {
struct pkginfo *pkg = array->pkgs[i];
struct {
struct fiemap fiemap;
struct fiemap_extent extent;
} fm;
const char *listfile;
int fd;
ensure_package_clientdata(pkg);
if (pkg->status == PKG_STAT_NOTINSTALLED ||
pkg->clientdata->listfile_phys_offs != 0)
continue;
pkg->clientdata->listfile_phys_offs = -1;
listfile = pkg_infodb_get_file(pkg, &pkg->installed, LISTFILE);
fd = open(listfile, O_RDONLY);
if (fd < 0)
continue;
memset(&fm, 0, sizeof(fm));
fm.fiemap.fm_start = 0;
fm.fiemap.fm_length = fs.f_bsize;
fm.fiemap.fm_flags = 0;
fm.fiemap.fm_extent_count = 1;
if (ioctl(fd, FS_IOC_FIEMAP, (unsigned long)&fm) == 0)
pkg->clientdata->listfile_phys_offs = fm.fiemap.fm_extents[0].fe_physical;
close(fd);
}
pkg_array_sort(array, pkg_sorter_by_listfile_phys_offs);
}
#elif defined(HAVE_POSIX_FADVISE)
static void
pkg_files_optimize_load(struct pkg_array *array)
{
int i;
/* Ask the kernel to start preloading the list files, so as to get a
* boost when later we actually load them. */
for (i = 0; i < array->n_pkgs; i++) {
struct pkginfo *pkg = array->pkgs[i];
const char *listfile;
int fd;
listfile = pkg_infodb_get_file(pkg, &pkg->installed, LISTFILE);
fd = open(listfile, O_RDONLY | O_NONBLOCK);
if (fd != -1) {
posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED);
close(fd);
}
}
}
#else
static void
pkg_files_optimize_load(struct pkg_array *array)
{
}
#endif
void ensure_allinstfiles_available(void) {
struct pkg_array array;
struct pkginfo *pkg;
struct progress progress;
int i;
if (allpackagesdone) return;
if (saidread < PKG_FILESDB_LOAD_DONE) {
int max = pkg_db_count_pkg();
saidread = PKG_FILESDB_LOAD_INPROGRESS;
progress_init(&progress, _("(Reading database ... "), max);
}
pkg_array_init_from_db(&array);
pkg_files_optimize_load(&array);
for (i = 0; i < array.n_pkgs; i++) {
pkg = array.pkgs[i];
ensure_packagefiles_available(pkg);
if (saidread == PKG_FILESDB_LOAD_INPROGRESS)
progress_step(&progress);
}
pkg_array_destroy(&array);
allpackagesdone = true;
if (saidread == PKG_FILESDB_LOAD_INPROGRESS) {
progress_done(&progress);
printf(P_("%d file or directory currently installed.)\n",
"%d files and directories currently installed.)\n", nfiles),
nfiles);
saidread = PKG_FILESDB_LOAD_DONE;
}
}
void ensure_allinstfiles_available_quiet(void) {
saidread = PKG_FILESDB_LOAD_DONE;
ensure_allinstfiles_available();
}
/*
* If mask is nonzero, will not write any file whose filenamenode
* has any flag bits set in mask.
*/
void
write_filelist_except(struct pkginfo *pkg, struct pkgbin *pkgbin,
struct fileinlist *list, enum filenamenode_flags mask)
{
struct atomic_file *file;
const char *listfile;
listfile = pkg_infodb_get_file(pkg, pkgbin, LISTFILE);
file = atomic_file_new(listfile, 0);
atomic_file_open(file);
while (list) {
if (!(mask && (list->namenode->flags & mask))) {
fputs(list->namenode->name, file->fp);
putc('\n', file->fp);
}
list= list->next;
}
atomic_file_sync(file);
atomic_file_close(file);
atomic_file_commit(file);
atomic_file_free(file);
dir_sync_path(pkg_infodb_get_dir());
note_must_reread_files_inpackage(pkg);
}
/*
* Initializes an iterator that appears to go through the file
* list ‘files’ in reverse order, returning the namenode from
* each. What actually happens is that we walk the list here,
* building up a reverse list, and then peel it apart one
* entry at a time.
*/
void
reversefilelist_init(struct reversefilelistiter *iter, struct fileinlist *files)
{
struct fileinlist *newent;
iter->todo = NULL;
while (files) {
newent= m_malloc(sizeof(struct fileinlist));
newent->namenode= files->namenode;
newent->next = iter->todo;
iter->todo = newent;
files= files->next;
}
}
struct filenamenode *
reversefilelist_next(struct reversefilelistiter *iter)
{
struct filenamenode *ret;
struct fileinlist *todo;
todo = iter->todo;
if (!todo)
return NULL;
ret= todo->namenode;
iter->todo = todo->next;
free(todo);
return ret;
}
/*
* Clients must call this function to clean up the reversefilelistiter
* if they wish to break out of the iteration before it is all done.
* Calling this function is not necessary if reversefilelist_next has
* been called until it returned 0.
*/
void
reversefilelist_abort(struct reversefilelistiter *iter)
{
while (reversefilelist_next(iter));
}
struct fileiterator {
struct filenamenode *namenode;
int nbinn;
};
/* This must always be a prime for optimal performance.
* This is the closest one to 2^18 (262144). */
#define BINS 262139
static struct filenamenode *bins[BINS];
struct fileiterator *
files_db_iter_new(void)
{
struct fileiterator *iter;
iter = m_malloc(sizeof(struct fileiterator));
iter->namenode = NULL;
iter->nbinn = 0;
return iter;
}
struct filenamenode *
files_db_iter_next(struct fileiterator *iter)
{
struct filenamenode *r= NULL;
while (!iter->namenode) {
if (iter->nbinn >= BINS)
return NULL;
iter->namenode = bins[iter->nbinn++];
}
r = iter->namenode;
iter->namenode = r->next;
return r;
}
void
files_db_iter_free(struct fileiterator *iter)
{
free(iter);
}
void filesdbinit(void) {
struct filenamenode *fnn;
int i;
for (i=0; i<BINS; i++)
for (fnn= bins[i]; fnn; fnn= fnn->next) {
fnn->flags= 0;
fnn->oldhash = NULL;
fnn->newhash = EMPTYHASHFLAG;
fnn->filestat = NULL;
}
}
struct filenamenode *findnamenode(const char *name, enum fnnflags flags) {
struct filenamenode **pointerp, *newnode;
const char *orig_name = name;
/* We skip initial slashes and ‘./’ pairs, and add our own single
* leading slash. */
name = path_skip_slash_dotslash(name);
pointerp = bins + (str_fnv_hash(name) % (BINS));
while (*pointerp) {
/* XXX: Why is the assert needed? It's checking already added entries. */
assert((*pointerp)->name[0] == '/');
if (strcmp((*pointerp)->name + 1, name) == 0)
break;
pointerp= &(*pointerp)->next;
}
if (*pointerp) return *pointerp;
if (flags & fnn_nonew)
return NULL;
newnode= nfmalloc(sizeof(struct filenamenode));
newnode->packages = NULL;
if((flags & fnn_nocopy) && name > orig_name && name[-1] == '/')
newnode->name = name - 1;
else {
char *newname= nfmalloc(strlen(name)+2);
newname[0]= '/'; strcpy(newname+1,name);
newnode->name= newname;
}
newnode->flags= 0;
newnode->next = NULL;
newnode->divert = NULL;
newnode->statoverride = NULL;
newnode->oldhash = NULL;
newnode->newhash = EMPTYHASHFLAG;
newnode->filestat = NULL;
newnode->trig_interested = NULL;
*pointerp= newnode;
nfiles++;
return newnode;
}
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