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xbps/lib/package_unpack.c

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C
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/*-
* Copyright (c) 2008-2015 Juan Romero Pardines.
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/stat.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <libgen.h>
#include "xbps_api_impl.h"
static int
set_extract_flags(uid_t euid)
{
int flags;
if (euid == 0)
flags = FEXTRACT_FLAGS;
else
flags = EXTRACT_FLAGS;
return flags;
}
static bool
match_preserved_file(struct xbps_handle *xhp, const char *entry)
{
const char *file;
if (xhp->preserved_files == NULL)
return false;
if (entry[0] == '.' && entry[1] != '\0') {
file = strchr(entry, '.') + 1;
assert(file);
} else {
file = entry;
}
return xbps_match_string_in_array(xhp->preserved_files, file);
}
static int
unpack_archive(struct xbps_handle *xhp,
xbps_dictionary_t pkg_repod,
const char *pkgver,
const char *fname,
struct archive *ar)
{
xbps_dictionary_t binpkg_filesd, pkg_filesd, obsd;
xbps_array_t array, obsoletes;
xbps_trans_type_t ttype;
const struct stat *entry_statp;
struct stat st;
struct xbps_unpack_cb_data xucd;
struct archive_entry *entry;
ssize_t entry_size;
const char *entry_pname, *pkgname;
char *buf = NULL;
int ar_rv, rv, error, entry_type, flags;
bool preserve, update, file_exists, keep_conf_file;
bool skip_extract, force, xucd_stats;
uid_t euid;
binpkg_filesd = pkg_filesd = NULL;
force = preserve = update = file_exists = false;
xucd_stats = false;
ar_rv = rv = error = entry_type = flags = 0;
xbps_dictionary_get_bool(pkg_repod, "preserve", &preserve);
ttype = xbps_transaction_pkg_type(pkg_repod);
memset(&xucd, 0, sizeof(xucd));
euid = geteuid();
if (!xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgname", &pkgname)) {
return EINVAL;
}
if (xhp->flags & XBPS_FLAG_FORCE_UNPACK) {
force = true;
}
if (ttype == XBPS_TRANS_UPDATE) {
update = true;
}
/*
* Remove obsolete files.
*/
if (!preserve &&
xbps_dictionary_get_dict(xhp->transd, "obsolete_files", &obsd) &&
(obsoletes = xbps_dictionary_get(obsd, pkgname))) {
for (unsigned int i = 0; i < xbps_array_count(obsoletes); i++) {
const char *file = NULL;
xbps_array_get_cstring_nocopy(obsoletes, i, &file);
if (remove(file) == -1) {
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_OBSOLETE_FAIL,
errno, pkgver,
"%s: failed to remove obsolete entry `%s': %s",
pkgver, file, strerror(errno));
continue;
}
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_OBSOLETE,
0, pkgver, "%s: removed obsolete entry: %s", pkgver, file);
}
}
/*
* Process the archive files.
*/
flags = set_extract_flags(euid);
/*
* First get all metadata files on archive in this order:
* - INSTALL <optional>
* - REMOVE <optional>
* - props.plist <required> but currently ignored
* - files.plist <required>
*
* The XBPS package must contain props and files plists, otherwise
* it's not a valid package.
*/
for (uint8_t i = 0; i < 4; i++) {
ar_rv = archive_read_next_header(ar, &entry);
if (ar_rv == ARCHIVE_EOF || ar_rv == ARCHIVE_FATAL)
break;
entry_pname = archive_entry_pathname(entry);
entry_size = archive_entry_size(entry);
if (strcmp("./INSTALL", entry_pname) == 0 ||
strcmp("./REMOVE", entry_pname) == 0 ||
strcmp("./props.plist", entry_pname) == 0) {
archive_read_data_skip(ar);
} else if (strcmp("./files.plist", entry_pname) == 0) {
binpkg_filesd = xbps_archive_get_dictionary(ar, entry);
if (binpkg_filesd == NULL) {
rv = EINVAL;
goto out;
}
break;
} else {
break;
}
}
/*
* If there was any error extracting files from archive, error out.
*/
if (ar_rv == ARCHIVE_FATAL) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL, rv, pkgver,
"%s: [unpack] 1: failed to extract files: %s",
pkgver, archive_error_string(ar));
rv = EINVAL;
goto out;
}
/*
* Bail out if required metadata files are not in archive.
*/
if (binpkg_filesd == NULL) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL, ENODEV, pkgver,
"%s: [unpack] invalid binary package `%s'.", pkgver, fname);
rv = ENODEV;
goto out;
}
/*
* Internalize current pkg metadata files plist.
*/
pkg_filesd = xbps_pkgdb_get_pkg_files(xhp, pkgname);
/*
* Unpack all files on archive now.
*/
for (;;) {
ar_rv = archive_read_next_header(ar, &entry);
if (ar_rv == ARCHIVE_EOF || ar_rv == ARCHIVE_FATAL)
break;
else if (ar_rv == ARCHIVE_RETRY)
continue;
entry_pname = archive_entry_pathname(entry);
entry_size = archive_entry_size(entry);
entry_type = archive_entry_filetype(entry);
entry_statp = archive_entry_stat(entry);
/*
* Ignore directories from archive.
*/
if (entry_type == AE_IFDIR) {
archive_read_data_skip(ar);
continue;
}
/*
* Prepare unpack callback ops.
*/
if (xhp->unpack_cb != NULL) {
xucd.xhp = xhp;
xucd.pkgver = pkgver;
xucd.entry = entry_pname;
xucd.entry_size = entry_size;
xucd.entry_is_conf = false;
/*
* Compute total entries in progress data, if set.
* total_entries = files + conf_files + links.
*/
if (binpkg_filesd && !xucd_stats) {
array = xbps_dictionary_get(binpkg_filesd, "files");
xucd.entry_total_count +=
(ssize_t)xbps_array_count(array);
array = xbps_dictionary_get(binpkg_filesd, "conf_files");
xucd.entry_total_count +=
(ssize_t)xbps_array_count(array);
array = xbps_dictionary_get(binpkg_filesd, "links");
xucd.entry_total_count +=
(ssize_t)xbps_array_count(array);
xucd_stats = true;
}
}
/*
* Skip files that match noextract patterns from configuration file.
*/
if (xhp->noextract && xbps_patterns_match(xhp->noextract, entry_pname+1)) {
xbps_dbg_printf(xhp, "[unpack] %s skipped (matched by a pattern)\n", entry_pname+1);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FILE_PRESERVED, 0,
pkgver, "%s: file `%s' won't be extracted, "
"it matches a noextract pattern.", pkgver, entry_pname);
archive_read_data_skip(ar);
continue;
}
/*
* Always check that extracted file exists and hash
* doesn't match, in that case overwrite the file.
* Otherwise skip extracting it.
*/
skip_extract = file_exists = keep_conf_file = false;
if (lstat(entry_pname, &st) == 0)
file_exists = true;
/*
* Check if the file to be extracted must be preserved, if true,
* pass to the next file.
*/
if (file_exists && match_preserved_file(xhp, entry_pname)) {
archive_read_data_skip(ar);
xbps_dbg_printf(xhp, "[unpack] `%s' exists on disk "
"and must be preserved, skipping.\n", entry_pname);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FILE_PRESERVED, 0,
pkgver, "%s: file `%s' won't be extracted, "
"it's preserved.", pkgver, entry_pname);
continue;
}
/*
* Check if current entry is a configuration file,
* that should be kept.
*/
if (!force && (entry_type == AE_IFREG)) {
buf = strchr(entry_pname, '.') + 1;
assert(buf != NULL);
keep_conf_file = xbps_entry_is_a_conf_file(binpkg_filesd, buf);
}
/*
* If file to be extracted does not match the file type of
* file currently stored on disk and is not a conf file
* that should be kept, remove file on disk.
*/
if (file_exists && !keep_conf_file &&
((entry_statp->st_mode & S_IFMT) != (st.st_mode & S_IFMT)))
(void)remove(entry_pname);
if (!force && (entry_type == AE_IFREG)) {
if (file_exists && (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))) {
/*
* Handle configuration files.
* Skip packages that don't have "conf_files"
* array on its XBPS_PKGPROPS
* dictionary.
*/
if (keep_conf_file) {
if (xhp->unpack_cb != NULL)
xucd.entry_is_conf = true;
rv = xbps_entry_install_conf_file(xhp,
binpkg_filesd, pkg_filesd, entry,
entry_pname, pkgver, S_ISLNK(st.st_mode));
if (rv == -1) {
/* error */
goto out;
} else if (rv == 0) {
/*
* Keep curfile as is.
*/
skip_extract = true;
}
rv = 0;
} else {
rv = xbps_file_hash_check_dictionary(
xhp, binpkg_filesd, "files", buf);
if (rv == -1) {
/* error */
xbps_dbg_printf(xhp,
"%s: failed to check"
" hash for `%s': %s\n",
pkgver, entry_pname,
strerror(errno));
goto out;
} else if (rv == 0) {
/*
* hash match, skip extraction.
*/
xbps_dbg_printf(xhp,
"%s: file %s "
"matches existing SHA256, "
"skipping...\n",
pkgver, entry_pname);
skip_extract = true;
}
rv = 0;
}
}
}
/*
* Check if current uid/gid differs from file in binpkg,
* and change permissions if true.
*/
if ((!force && file_exists && skip_extract && (euid == 0)) &&
(((archive_entry_uid(entry) != st.st_uid)) ||
((archive_entry_gid(entry) != st.st_gid)))) {
if (lchown(entry_pname,
archive_entry_uid(entry),
archive_entry_gid(entry)) != 0) {
xbps_dbg_printf(xhp,
"%s: failed "
"to set uid/gid to %"PRIu64":%"PRIu64" (%s)\n",
pkgver, archive_entry_uid(entry),
archive_entry_gid(entry),
strerror(errno));
} else {
xbps_dbg_printf(xhp, "%s: entry %s changed "
"uid/gid to %"PRIu64":%"PRIu64".\n", pkgver, entry_pname,
archive_entry_uid(entry),
archive_entry_gid(entry));
}
}
/*
* Check if current file mode differs from file mode
* in binpkg and apply perms if true.
*/
if (!force && file_exists && skip_extract &&
(archive_entry_mode(entry) != st.st_mode)) {
if (chmod(entry_pname,
archive_entry_mode(entry)) != 0) {
xbps_dbg_printf(xhp,
"%s: failed "
"to set perms %s to %s: %s\n",
pkgver, archive_entry_strmode(entry),
entry_pname,
strerror(errno));
rv = EINVAL;
goto out;
}
xbps_dbg_printf(xhp, "%s: entry %s changed file "
"mode to %s.\n", pkgver, entry_pname,
archive_entry_strmode(entry));
}
if (!force && skip_extract) {
archive_read_data_skip(ar);
continue;
}
/*
* Reset entry_pname again because if entry's pathname
* has been changed it will become a dangling pointer.
*/
entry_pname = archive_entry_pathname(entry);
/*
* Extract entry from archive.
*/
if (archive_read_extract(ar, entry, flags) != 0) {
error = archive_errno(ar);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
error, pkgver,
"%s: [unpack] failed to extract file `%s': %s",
pkgver, entry_pname, strerror(error));
break;
} else {
if (xhp->unpack_cb != NULL) {
xucd.entry = entry_pname;
xucd.entry_extract_count++;
(*xhp->unpack_cb)(&xucd, xhp->unpack_cb_data);
}
}
}
/*
* If there was any error extracting files from archive, error out.
*/
if (error || ar_rv == ARCHIVE_FATAL) {
rv = error;
if (!rv)
rv = ar_rv;
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL, rv, pkgver,
"%s: [unpack] failed to extract files: %s",
pkgver, strerror(rv));
goto out;
}
/*
* Externalize binpkg files.plist to disk, if not empty.
*/
if (xbps_dictionary_count(binpkg_filesd)) {
mode_t prev_umask;
prev_umask = umask(022);
buf = xbps_xasprintf("%s/.%s-files.plist", xhp->metadir, pkgname);
if (!xbps_dictionary_externalize_to_file(binpkg_filesd, buf)) {
rv = errno;
umask(prev_umask);
free(buf);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver, "%s: [unpack] failed to externalize pkg "
"pkg metadata files: %s", pkgver, strerror(rv));
goto out;
}
umask(prev_umask);
free(buf);
}
out:
/*
* If unpacked pkg has no files, remove its files metadata plist.
*/
if (!xbps_dictionary_count(binpkg_filesd)) {
buf = xbps_xasprintf("%s/.%s-files.plist", xhp->metadir, pkgname);
unlink(buf);
free(buf);
}
xbps_object_release(binpkg_filesd);
return rv;
}
int HIDDEN
xbps_unpack_binary_pkg(struct xbps_handle *xhp, xbps_dictionary_t pkg_repod)
{
struct archive *ar = NULL;
struct stat st;
const char *pkgver;
char *bpkg = NULL;
int pkg_fd = -1, rv = 0;
mode_t myumask;
assert(xbps_object_type(pkg_repod) == XBPS_TYPE_DICTIONARY);
xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgver", &pkgver);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK, 0, pkgver, NULL);
bpkg = xbps_repository_pkg_path(xhp, pkg_repod);
if (bpkg == NULL) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
errno, pkgver,
"%s: [unpack] cannot determine binary package "
"file for `%s': %s", pkgver, bpkg, strerror(errno));
return errno;
}
if ((ar = archive_read_new()) == NULL) {
free(bpkg);
return ENOMEM;
}
/*
* Enable support for tar format and some compression methods.
*/
archive_read_support_filter_gzip(ar);
archive_read_support_filter_bzip2(ar);
archive_read_support_filter_xz(ar);
archive_read_support_filter_lz4(ar);
archive_read_support_filter_zstd(ar);
archive_read_support_format_tar(ar);
myumask = umask(022);
pkg_fd = open(bpkg, O_RDONLY|O_CLOEXEC);
if (pkg_fd == -1) {
rv = errno;
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver,
"%s: [unpack] failed to open binary package `%s': %s",
pkgver, bpkg, strerror(rv));
goto out;
}
if (fstat(pkg_fd, &st) == -1) {
rv = errno;
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver,
"%s: [unpack] failed to fstat binary package `%s': %s",
pkgver, bpkg, strerror(rv));
goto out;
}
if (archive_read_open_fd(ar, pkg_fd, st.st_blksize) == ARCHIVE_FATAL) {
rv = archive_errno(ar);
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver,
"%s: [unpack] failed to read binary package `%s': %s",
pkgver, bpkg, strerror(rv));
goto out;
}
/*
* Externalize pkg files dictionary to metadir.
*/
if (access(xhp->metadir, R_OK|X_OK) == -1) {
rv = errno;
if (rv != ENOENT)
goto out;
if (xbps_mkpath(xhp->metadir, 0755) == -1) {
rv = errno;
goto out;
}
}
/*
* Extract archive files.
*/
if ((rv = unpack_archive(xhp, pkg_repod, pkgver, bpkg, ar)) != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL, rv, pkgver,
"%s: [unpack] failed to unpack files from archive: %s",
pkgver, strerror(rv));
goto out;
}
/*
* Set package state to unpacked.
*/
if ((rv = xbps_set_pkg_state_dictionary(pkg_repod,
XBPS_PKG_STATE_UNPACKED)) != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver,
"%s: [unpack] failed to set state to unpacked: %s",
pkgver, strerror(rv));
}
/* register alternatives */
if ((rv = xbps_alternatives_register(xhp, pkg_repod)) != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_UNPACK_FAIL,
rv, pkgver,
"%s: [unpack] failed to register alternatives: %s",
pkgver, strerror(rv));
}
out:
if (pkg_fd != -1)
close(pkg_fd);
if (ar != NULL)
archive_read_free(ar);
if (bpkg)
free(bpkg);
/* restore */
umask(myumask);
return rv;
}
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