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mirror of https://github.com/moparisthebest/pacman synced 2024-12-23 00:08:50 -05:00
pacman/lib/libalpm/be_package.c
Dan McGee f12ead2cf2 Remove three unnecessary usages of alpm_list_count()
For the files count when loading from a package, we can keep a counter.
The two in the frontend were completely useless due to the fact that if
sync_dbs is non-NULL, alpm_list_count() will always be greater than 0.

Signed-off-by: Dan McGee <dan@archlinux.org>
2011-06-24 01:36:47 -05:00

406 lines
13 KiB
C

/*
* be_package.c : backend for packages
*
* Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
*
* This program 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 program 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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* libarchive */
#include <archive.h>
#include <archive_entry.h>
/* libalpm */
#include "alpm_list.h"
#include "alpm.h"
#include "util.h"
#include "log.h"
#include "handle.h"
#include "package.h"
#include "deps.h" /* _alpm_splitdep */
/**
* Open a package changelog for reading. Similar to fopen in functionality,
* except that the returned 'file stream' is from an archive.
* @param pkg the package (file) to read the changelog
* @return a 'file stream' to the package changelog
*/
static void *_package_changelog_open(pmpkg_t *pkg)
{
ASSERT(pkg != NULL, return NULL);
struct archive *archive = NULL;
struct archive_entry *entry;
const char *pkgfile = pkg->origin_data.file;
if((archive = archive_read_new()) == NULL) {
RET_ERR(pkg->handle, PM_ERR_LIBARCHIVE, NULL);
}
archive_read_support_compression_all(archive);
archive_read_support_format_all(archive);
if(archive_read_open_filename(archive, pkgfile,
ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
RET_ERR(pkg->handle, PM_ERR_PKG_OPEN, NULL);
}
while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
const char *entry_name = archive_entry_pathname(entry);
if(strcmp(entry_name, ".CHANGELOG") == 0) {
return archive;
}
}
/* we didn't find a changelog */
archive_read_finish(archive);
errno = ENOENT;
return NULL;
}
/**
* Read data from an open changelog 'file stream'. Similar to fread in
* functionality, this function takes a buffer and amount of data to read.
* @param ptr a buffer to fill with raw changelog data
* @param size the size of the buffer
* @param pkg the package that the changelog is being read from
* @param fp a 'file stream' to the package changelog
* @return the number of characters read, or 0 if there is no more data
*/
static size_t _package_changelog_read(void *ptr, size_t size,
const pmpkg_t UNUSED *pkg, const void *fp)
{
ssize_t sret = archive_read_data((struct archive *)fp, ptr, size);
/* Report error (negative values) */
if(sret < 0) {
RET_ERR(pkg->handle, PM_ERR_LIBARCHIVE, 0);
} else {
return (size_t)sret;
}
}
/**
* Close a package changelog for reading. Similar to fclose in functionality,
* except that the 'file stream' is from an archive.
* @param pkg the package (file) that the changelog was read from
* @param fp a 'file stream' to the package changelog
* @return whether closing the package changelog stream was successful
*/
static int _package_changelog_close(const pmpkg_t UNUSED *pkg, void *fp)
{
return archive_read_finish((struct archive *)fp);
}
/** Package file operations struct accessor. We implement this as a method
* rather than a static struct as in be_files because we want to reuse the
* majority of the default_pkg_ops struct and add only a few operations of
* our own on top.
*/
static struct pkg_operations *get_file_pkg_ops(void)
{
static struct pkg_operations file_pkg_ops;
static int file_pkg_ops_initialized = 0;
if(!file_pkg_ops_initialized) {
file_pkg_ops = default_pkg_ops;
file_pkg_ops.changelog_open = _package_changelog_open;
file_pkg_ops.changelog_read = _package_changelog_read;
file_pkg_ops.changelog_close = _package_changelog_close;
file_pkg_ops_initialized = 1;
}
return &file_pkg_ops;
}
/**
* Parses the package description file for a package into a pmpkg_t struct.
* @param archive the archive to read from, pointed at the .PKGINFO entry
* @param newpkg an empty pmpkg_t struct to fill with package info
*
* @return 0 on success, -1 on error
*/
static int parse_descfile(pmhandle_t *handle, struct archive *a, pmpkg_t *newpkg)
{
char *ptr = NULL;
char *key = NULL;
int ret, linenum = 0;
struct archive_read_buffer buf;
memset(&buf, 0, sizeof(buf));
/* 512K for a line length seems reasonable */
buf.max_line_size = 512 * 1024;
/* loop until we reach EOF or other error */
while((ret = _alpm_archive_fgets(a, &buf)) == ARCHIVE_OK) {
char *line = _alpm_strtrim(buf.line);
linenum++;
if(strlen(line) == 0 || line[0] == '#') {
continue;
}
ptr = line;
key = strsep(&ptr, "=");
if(key == NULL || ptr == NULL) {
_alpm_log(handle, PM_LOG_DEBUG, "%s: syntax error in description file line %d\n",
newpkg->name ? newpkg->name : "error", linenum);
} else {
key = _alpm_strtrim(key);
while(*ptr == ' ') ptr++;
ptr = _alpm_strtrim(ptr);
if(strcmp(key, "pkgname") == 0) {
STRDUP(newpkg->name, ptr, return -1);
newpkg->name_hash = _alpm_hash_sdbm(newpkg->name);
} else if(strcmp(key, "pkgbase") == 0) {
/* not used atm */
} else if(strcmp(key, "pkgver") == 0) {
STRDUP(newpkg->version, ptr, return -1);
} else if(strcmp(key, "pkgdesc") == 0) {
STRDUP(newpkg->desc, ptr, return -1);
} else if(strcmp(key, "group") == 0) {
newpkg->groups = alpm_list_add(newpkg->groups, strdup(ptr));
} else if(strcmp(key, "url") == 0) {
STRDUP(newpkg->url, ptr, return -1);
} else if(strcmp(key, "license") == 0) {
newpkg->licenses = alpm_list_add(newpkg->licenses, strdup(ptr));
} else if(strcmp(key, "builddate") == 0) {
newpkg->builddate = _alpm_parsedate(ptr);
} else if(strcmp(key, "packager") == 0) {
STRDUP(newpkg->packager, ptr, return -1);
} else if(strcmp(key, "arch") == 0) {
STRDUP(newpkg->arch, ptr, return -1);
} else if(strcmp(key, "size") == 0) {
/* size in the raw package is uncompressed (installed) size */
newpkg->isize = atol(ptr);
} else if(strcmp(key, "depend") == 0) {
pmdepend_t *dep = _alpm_splitdep(ptr);
newpkg->depends = alpm_list_add(newpkg->depends, dep);
} else if(strcmp(key, "optdepend") == 0) {
newpkg->optdepends = alpm_list_add(newpkg->optdepends, strdup(ptr));
} else if(strcmp(key, "conflict") == 0) {
newpkg->conflicts = alpm_list_add(newpkg->conflicts, strdup(ptr));
} else if(strcmp(key, "replaces") == 0) {
newpkg->replaces = alpm_list_add(newpkg->replaces, strdup(ptr));
} else if(strcmp(key, "provides") == 0) {
newpkg->provides = alpm_list_add(newpkg->provides, strdup(ptr));
} else if(strcmp(key, "backup") == 0) {
pmbackup_t *backup;
CALLOC(backup, 1, sizeof(pmbackup_t), return -1);
STRDUP(backup->name, ptr, return -1);
newpkg->backup = alpm_list_add(newpkg->backup, backup);
} else if(strcmp(key, "force") == 0) {
/* deprecated, skip it */
} else if(strcmp(key, "makepkgopt") == 0) {
/* not used atm */
} else {
_alpm_log(handle, PM_LOG_DEBUG, "%s: unknown key '%s' in description file line %d\n",
newpkg->name ? newpkg->name : "error", key, linenum);
}
}
line[0] = '\0';
}
if(ret != ARCHIVE_EOF) {
_alpm_log(handle, PM_LOG_DEBUG, "error parsing package descfile\n");
return -1;
}
return 0;
}
/**
* Load a package and create the corresponding pmpkg_t struct.
* @param handle the context handle
* @param pkgfile path to the package file
* @param full whether to stop the load after metadata is read or continue
* through the full archive
* @return An information filled pmpkg_t struct
*/
pmpkg_t *_alpm_pkg_load_internal(pmhandle_t *handle, const char *pkgfile,
int full, const char *md5sum, const char *base64_sig,
pgp_verify_t check_sig)
{
int ret;
int config = 0;
struct archive *archive;
struct archive_entry *entry;
pmpkg_t *newpkg = NULL;
struct stat st;
size_t files_count = 0;
if(pkgfile == NULL || strlen(pkgfile) == 0) {
RET_ERR(handle, PM_ERR_WRONG_ARGS, NULL);
}
/* attempt to stat the package file, ensure it exists */
if(stat(pkgfile, &st) == 0) {
newpkg = _alpm_pkg_new();
if(newpkg == NULL) {
RET_ERR(handle, PM_ERR_MEMORY, NULL);
}
newpkg->filename = strdup(pkgfile);
newpkg->size = st.st_size;
} else {
/* couldn't stat the pkgfile, return an error */
RET_ERR(handle, PM_ERR_PKG_OPEN, NULL);
}
/* first steps- validate the package file */
_alpm_log(handle, PM_LOG_DEBUG, "md5sum: %s\n", md5sum);
if(md5sum) {
_alpm_log(handle, PM_LOG_DEBUG, "checking md5sum for %s\n", pkgfile);
if(_alpm_test_md5sum(pkgfile, md5sum) != 0) {
alpm_pkg_free(newpkg);
RET_ERR(handle, PM_ERR_PKG_INVALID, NULL);
}
}
_alpm_log(handle, PM_LOG_DEBUG, "base64_sig: %s\n", base64_sig);
if(check_sig != PM_PGP_VERIFY_NEVER) {
_alpm_log(handle, PM_LOG_DEBUG, "checking signature for %s\n", pkgfile);
ret = _alpm_gpgme_checksig(handle, pkgfile, base64_sig);
if((check_sig == PM_PGP_VERIFY_ALWAYS && ret != 0) ||
(check_sig == PM_PGP_VERIFY_OPTIONAL && ret == 1)) {
alpm_pkg_free(newpkg);
RET_ERR(handle, PM_ERR_SIG_INVALID, NULL);
}
}
/* next- try to create an archive object to read in the package */
if((archive = archive_read_new()) == NULL) {
alpm_pkg_free(newpkg);
RET_ERR(handle, PM_ERR_LIBARCHIVE, NULL);
}
archive_read_support_compression_all(archive);
archive_read_support_format_all(archive);
if(archive_read_open_filename(archive, pkgfile,
ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
alpm_pkg_free(newpkg);
RET_ERR(handle, PM_ERR_PKG_OPEN, NULL);
}
_alpm_log(handle, PM_LOG_DEBUG, "starting package load for %s\n", pkgfile);
/* If full is false, only read through the archive until we find our needed
* metadata. If it is true, read through the entire archive, which serves
* as a verfication of integrity and allows us to create the filelist. */
while((ret = archive_read_next_header(archive, &entry)) == ARCHIVE_OK) {
const char *entry_name = archive_entry_pathname(entry);
if(strcmp(entry_name, ".PKGINFO") == 0) {
/* parse the info file */
if(parse_descfile(handle, archive, newpkg) != 0) {
_alpm_log(handle, PM_LOG_ERROR, _("could not parse package description file in %s\n"),
pkgfile);
goto pkg_invalid;
}
if(newpkg->name == NULL || strlen(newpkg->name) == 0) {
_alpm_log(handle, PM_LOG_ERROR, _("missing package name in %s\n"), pkgfile);
goto pkg_invalid;
}
if(newpkg->version == NULL || strlen(newpkg->version) == 0) {
_alpm_log(handle, PM_LOG_ERROR, _("missing package version in %s\n"), pkgfile);
goto pkg_invalid;
}
config = 1;
continue;
} else if(strcmp(entry_name, ".INSTALL") == 0) {
newpkg->scriptlet = 1;
} else if(*entry_name == '.') {
/* for now, ignore all files starting with '.' that haven't
* already been handled (for future possibilities) */
} else if(full) {
/* Keep track of all files for filelist generation */
newpkg->files = alpm_list_add(newpkg->files, strdup(entry_name));
files_count++;
}
if(archive_read_data_skip(archive)) {
_alpm_log(handle, PM_LOG_ERROR, _("error while reading package %s: %s\n"),
pkgfile, archive_error_string(archive));
handle->pm_errno = PM_ERR_LIBARCHIVE;
goto error;
}
/* if we are not doing a full read, see if we have all we need */
if(!full && config) {
break;
}
}
if(ret != ARCHIVE_EOF && ret != ARCHIVE_OK) { /* An error occured */
_alpm_log(handle, PM_LOG_ERROR, _("error while reading package %s: %s\n"),
pkgfile, archive_error_string(archive));
handle->pm_errno = PM_ERR_LIBARCHIVE;
goto error;
}
if(!config) {
_alpm_log(handle, PM_LOG_ERROR, _("missing package metadata in %s\n"), pkgfile);
goto pkg_invalid;
}
archive_read_finish(archive);
/* internal fields for package struct */
newpkg->origin = PKG_FROM_FILE;
newpkg->origin_data.file = strdup(pkgfile);
newpkg->ops = get_file_pkg_ops();
newpkg->handle = handle;
if(full) {
/* "checking for conflicts" requires a sorted list, ensure that here */
_alpm_log(handle, PM_LOG_DEBUG, "sorting package filelist for %s\n", pkgfile);
newpkg->files = alpm_list_msort(newpkg->files, files_count, _alpm_str_cmp);
newpkg->infolevel = INFRQ_ALL;
} else {
/* get rid of any partial filelist we may have collected, it is invalid */
FREELIST(newpkg->files);
newpkg->infolevel = INFRQ_BASE | INFRQ_DESC;
}
return newpkg;
pkg_invalid:
handle->pm_errno = PM_ERR_PKG_INVALID;
error:
_alpm_pkg_free(newpkg);
archive_read_finish(archive);
return NULL;
}
int SYMEXPORT alpm_pkg_load(pmhandle_t *handle, const char *filename, int full,
pgp_verify_t check_sig, pmpkg_t **pkg)
{
CHECK_HANDLE(handle, return -1);
ASSERT(pkg != NULL, RET_ERR(handle, PM_ERR_WRONG_ARGS, -1));
*pkg = _alpm_pkg_load_internal(handle, filename, full, NULL, NULL, check_sig);
if(*pkg == NULL) {
/* pm_errno is set by pkg_load */
return -1;
}
return 0;
}
/* vim: set ts=2 sw=2 noet: */