Move changelog functions to callback struct

[pacman-ng.git] / lib / libalpm / be_files.c

/*
 *  be_files.c
 *
 *  Copyright (c) 2006-2010 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 <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdint.h> /* intmax_t */
#include <sys/stat.h>
#include <dirent.h>
#include <ctype.h>
#include <time.h>
#include <limits.h> /* PATH_MAX */
#include <locale.h> /* setlocale */

/* libarchive */
#include <archive.h>
#include <archive_entry.h>

/* libalpm */
#include "db.h"
#include "alpm_list.h"
#include "cache.h"
#include "log.h"
#include "util.h"
#include "alpm.h"
#include "handle.h"
#include "package.h"
#include "delta.h"
#include "deps.h"
#include "dload.h"


#define LAZY_LOAD(info, errret) \
        do { \
                ALPM_LOG_FUNC; \
                ASSERT(handle != NULL, return(errret)); \
                ASSERT(pkg != NULL, return(errret)); \
                if(pkg->origin != PKG_FROM_FILE && !(pkg->infolevel & info)) { \
                        _alpm_db_read(pkg->origin_data.db, pkg, info); \
                } \
        } while(0)


/* Cache-specific accessor functions. These implementations allow for lazy
 * loading by the files backend when a data member is actually needed
 * rather than loading all pieces of information when the package is first
 * initialized.
 */

const char *_cache_get_filename(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->filename;
}

const char *_cache_get_name(pmpkg_t *pkg)
{
        ASSERT(pkg != NULL, return(NULL));
        return pkg->name;
}

static const char *_cache_get_version(pmpkg_t *pkg)
{
        ASSERT(pkg != NULL, return(NULL));
        return pkg->version;
}

static const char *_cache_get_desc(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->desc;
}

const char *_cache_get_url(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->url;
}

time_t _cache_get_builddate(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, 0);
        return pkg->builddate;
}

time_t _cache_get_installdate(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, 0);
        return pkg->installdate;
}

const char *_cache_get_packager(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->packager;
}

const char *_cache_get_md5sum(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->md5sum;
}

const char *_cache_get_arch(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->arch;
}

off_t _cache_get_size(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, -1);
        return pkg->size;
}

off_t _cache_get_isize(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, -1);
        return pkg->isize;
}

pmpkgreason_t _cache_get_reason(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, -1);
        return pkg->reason;
}

alpm_list_t *_cache_get_licenses(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->licenses;
}

alpm_list_t *_cache_get_groups(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->groups;
}

int _cache_has_force(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, -1);
        return pkg->force;
}

alpm_list_t *_cache_get_depends(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DEPENDS, NULL);
        return pkg->depends;
}

alpm_list_t *_cache_get_optdepends(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DEPENDS, NULL);
        return pkg->optdepends;
}

alpm_list_t *_cache_get_conflicts(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DEPENDS, NULL);
        return pkg->conflicts;
}

alpm_list_t *_cache_get_provides(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DEPENDS, NULL);
        return pkg->provides;
}

alpm_list_t *_cache_get_replaces(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DESC, NULL);
        return pkg->replaces;
}

alpm_list_t *_cache_get_deltas(pmpkg_t *pkg)
{
        LAZY_LOAD(INFRQ_DELTAS, NULL);
        return pkg->deltas;
}

alpm_list_t *_cache_get_files(pmpkg_t *pkg)
{
        ALPM_LOG_FUNC;

        /* Sanity checks */
        ASSERT(handle != NULL, return(NULL));
        ASSERT(pkg != NULL, return(NULL));

        if(pkg->origin == PKG_FROM_LOCALDB
                 && !(pkg->infolevel & INFRQ_FILES)) {
                _alpm_db_read(pkg->origin_data.db, pkg, INFRQ_FILES);
        }
        return pkg->files;
}

alpm_list_t *_cache_get_backup(pmpkg_t *pkg)
{
        ALPM_LOG_FUNC;

        /* Sanity checks */
        ASSERT(handle != NULL, return(NULL));
        ASSERT(pkg != NULL, return(NULL));

        if(pkg->origin == PKG_FROM_LOCALDB
                 && !(pkg->infolevel & INFRQ_FILES)) {
                _alpm_db_read(pkg->origin_data.db, pkg, INFRQ_FILES);
        }
        return pkg->backup;
}

/**
 * Open a package changelog for reading. Similar to fopen in functionality,
 * except that the returned 'file stream' is from the database.
 * @param pkg the package (from db) to read the changelog
 * @return a 'file stream' to the package changelog
 */
void *_cache_changelog_open(pmpkg_t *pkg)
{
        ALPM_LOG_FUNC;

        /* Sanity checks */
        ASSERT(handle != NULL, return(NULL));
        ASSERT(pkg != NULL, return(NULL));

        char clfile[PATH_MAX];
        snprintf(clfile, PATH_MAX, "%s/%s/%s-%s/changelog",
                        alpm_option_get_dbpath(),
                        alpm_db_get_name(alpm_pkg_get_db(pkg)),
                        alpm_pkg_get_name(pkg),
                        alpm_pkg_get_version(pkg));
        return fopen(clfile, "r");
}

/**
 * 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
 */
size_t _cache_changelog_read(void *ptr, size_t size,
                const pmpkg_t *pkg, const void *fp)
{
        return ( fread(ptr, 1, size, (FILE*)fp) );
}

/*
int _cache_changelog_feof(const pmpkg_t *pkg, void *fp)
{
        return( feof((FILE*)fp) );
}
*/

/**
 * Close a package changelog for reading. Similar to fclose in functionality,
 * except that the 'file stream' is from the database.
 * @param pkg the package that the changelog was read from
 * @param fp a 'file stream' to the package changelog
 * @return whether closing the package changelog stream was successful
 */
int _cache_changelog_close(const pmpkg_t *pkg, void *fp)
{
        return( fclose((FILE*)fp) );
}

/** The sync database operations struct. Get package fields through
 * lazy accessor methods that handle any backend loading and caching
 * logic.
 */
static struct pkg_operations sync_pkg_ops = {
        .get_filename    = _cache_get_filename,
        .get_name        = _cache_get_name,
        .get_version     = _cache_get_version,
        .get_desc        = _cache_get_desc,
        .get_url         = _cache_get_url,
        .get_builddate   = _cache_get_builddate,
        .get_installdate = _cache_get_installdate,
        .get_packager    = _cache_get_packager,
        .get_md5sum      = _cache_get_md5sum,
        .get_arch        = _cache_get_arch,
        .get_size        = _cache_get_size,
        .get_isize       = _cache_get_isize,
        .get_reason      = _cache_get_reason,
        .has_force       = _cache_has_force,
        .get_licenses    = _cache_get_licenses,
        .get_groups      = _cache_get_groups,
        .get_depends     = _cache_get_depends,
        .get_optdepends  = _cache_get_optdepends,
        .get_conflicts   = _cache_get_conflicts,
        .get_provides    = _cache_get_provides,
        .get_replaces    = _cache_get_replaces,
        .get_deltas      = _cache_get_deltas,
        .get_files       = _cache_get_files,
        .get_backup      = _cache_get_backup,
};

/** The local database operations struct. Get package fields through
 * lazy accessor methods that handle any backend loading and caching
 * logic.
 */
static struct pkg_operations local_pkg_ops = {
        .get_filename    = _cache_get_filename,
        .get_name        = _cache_get_name,
        .get_version     = _cache_get_version,
        .get_desc        = _cache_get_desc,
        .get_url         = _cache_get_url,
        .get_builddate   = _cache_get_builddate,
        .get_installdate = _cache_get_installdate,
        .get_packager    = _cache_get_packager,
        .get_md5sum      = _cache_get_md5sum,
        .get_arch        = _cache_get_arch,
        .get_size        = _cache_get_size,
        .get_isize       = _cache_get_isize,
        .get_reason      = _cache_get_reason,
        .has_force       = _cache_has_force,
        .get_licenses    = _cache_get_licenses,
        .get_groups      = _cache_get_groups,
        .get_depends     = _cache_get_depends,
        .get_optdepends  = _cache_get_optdepends,
        .get_conflicts   = _cache_get_conflicts,
        .get_provides    = _cache_get_provides,
        .get_replaces    = _cache_get_replaces,
        .get_deltas      = _cache_get_deltas,
        .get_files       = _cache_get_files,
        .get_backup      = _cache_get_backup,

        .changelog_open  = _cache_changelog_open,
        .changelog_read  = _cache_changelog_read,
        .changelog_close = _cache_changelog_close,
};

static int checkdbdir(pmdb_t *db)
{
        struct stat buf;
        const char *path = _alpm_db_path(db);

        if(stat(path, &buf) != 0) {
                _alpm_log(PM_LOG_DEBUG, "database dir '%s' does not exist, creating it\n",
                                path);
                if(_alpm_makepath(path) != 0) {
                        RET_ERR(PM_ERR_SYSTEM, -1);
                }
        } else if(!S_ISDIR(buf.st_mode)) {
                _alpm_log(PM_LOG_WARNING, _("removing invalid database: %s\n"), path);
                if(unlink(path) != 0 || _alpm_makepath(path) != 0) {
                        RET_ERR(PM_ERR_SYSTEM, -1);
                }
        }
        return(0);
}

/* create list of directories in db */
static int dirlist_from_tar(const char *archive, alpm_list_t **dirlist)
{
        struct archive *_archive;
        struct archive_entry *entry;

        if((_archive = archive_read_new()) == NULL)
                RET_ERR(PM_ERR_LIBARCHIVE, -1);

        archive_read_support_compression_all(_archive);
        archive_read_support_format_all(_archive);

        if(archive_read_open_filename(_archive, archive,
                                ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
                _alpm_log(PM_LOG_ERROR, _("could not open %s: %s\n"), archive,
                                archive_error_string(_archive));
                RET_ERR(PM_ERR_PKG_OPEN, -1);
        }

        while(archive_read_next_header(_archive, &entry) == ARCHIVE_OK) {
                const struct stat *st;
                const char *entryname; /* the name of the file in the archive */

                st = archive_entry_stat(entry);
                entryname = archive_entry_pathname(entry);

                if(S_ISDIR(st->st_mode)) {
                        char *name = strdup(entryname);
                        *dirlist = alpm_list_add(*dirlist, name);
                }
        }
        archive_read_finish(_archive);

        *dirlist = alpm_list_msort(*dirlist, alpm_list_count(*dirlist), _alpm_str_cmp);
        return(0);
}

static int is_dir(const char *path, struct dirent *entry)
{
#ifdef DT_DIR
        return(entry->d_type == DT_DIR);
#else
        char buffer[PATH_MAX];
        snprintf(buffer, PATH_MAX, "%s/%s", path, entry->d_name);

        struct stat sbuf;
        if (!stat(buffer, &sbuf)) {
                return(S_ISDIR(sbuf.st_mode));
        }

        return(0);
#endif
}

/* create list of directories in db */
static int dirlist_from_fs(const char *syncdbpath, alpm_list_t **dirlist)
{
        DIR *dbdir;
        struct dirent *ent = NULL;

        dbdir = opendir(syncdbpath);
        if (dbdir != NULL) {
                while((ent = readdir(dbdir)) != NULL) {
                        char *name = ent->d_name;
                        size_t len;
                        char *entry;

                        if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
                                continue;
                        }

                        if(!is_dir(syncdbpath, ent)) {
                                continue;
                        }

                        len = strlen(name);
                        MALLOC(entry, len + 2, RET_ERR(PM_ERR_MEMORY, -1));
                        strcpy(entry, name);
                        entry[len] = '/';
                        entry[len+1] = '\0';
                        *dirlist = alpm_list_add(*dirlist, entry);
                }
                closedir(dbdir);
        }

        *dirlist = alpm_list_msort(*dirlist, alpm_list_count(*dirlist), _alpm_str_cmp);
        return(0);
}

/* remove old directories from dbdir */
static int remove_olddir(const char *syncdbpath, alpm_list_t *dirlist)
{
        alpm_list_t *i;
        for (i = dirlist; i; i = i->next) {
                const char *name = i->data;
                char *dbdir;
                size_t len = strlen(syncdbpath) + strlen(name) + 2;
                MALLOC(dbdir, len, RET_ERR(PM_ERR_MEMORY, -1));
                snprintf(dbdir, len, "%s%s", syncdbpath, name);
                _alpm_log(PM_LOG_DEBUG, "removing: %s\n", dbdir);
                if(_alpm_rmrf(dbdir) != 0) {
                        _alpm_log(PM_LOG_ERROR, _("could not remove database directory %s\n"), dbdir);
                        free(dbdir);
                        RET_ERR(PM_ERR_DB_REMOVE, -1);
                }
                free(dbdir);
        }
        return(0);
}

/** Update a package database
 *
 * An update of the package database \a db will be attempted. Unless
 * \a force is true, the update will only be performed if the remote
 * database was modified since the last update.
 *
 * A transaction is necessary for this operation, in order to obtain a
 * database lock. During this transaction the front-end will be informed
 * of the download progress of the database via the download callback.
 *
 * Example:
 * @code
 * pmdb_t *db;
 * int result;
 * db = alpm_list_getdata(alpm_option_get_syncdbs());
 * if(alpm_trans_init(0, NULL, NULL, NULL) == 0) {
 *     result = alpm_db_update(0, db);
 *     alpm_trans_release();
 *
 *     if(result > 0) {
 *             printf("Unable to update database: %s\n", alpm_strerrorlast());
 *     } else if(result < 0) {
 *         printf("Database already up to date\n");
 *     } else {
 *         printf("Database updated\n");
 *     }
 * }
 * @endcode
 *
 * @ingroup alpm_databases
 * @note After a successful update, the \link alpm_db_get_pkgcache()
 * package cache \endlink will be invalidated
 * @param force if true, then forces the update, otherwise update only in case
 * the database isn't up to date
 * @param db pointer to the package database to update
 * @return 0 on success, > 0 on error (pm_errno is set accordingly), < 0 if up
 * to date
 */
int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
{
        char *dbfile, *dbfilepath, *syncpath;
        const char *dbpath, *syncdbpath;
        alpm_list_t *newdirlist = NULL, *olddirlist = NULL;
        alpm_list_t *onlynew = NULL, *onlyold = NULL;
        size_t len;
        int ret;

        ALPM_LOG_FUNC;

        /* Sanity checks */
        ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
        ASSERT(db != NULL && db != handle->db_local, RET_ERR(PM_ERR_WRONG_ARGS, -1));
        /* Verify we are in a transaction.  This is done _mainly_ because we need a DB
         * lock - if we update without a db lock, we may kludge some other pacman
         * process that _has_ a lock.
         */
        ASSERT(handle->trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
        ASSERT(handle->trans->state == STATE_INITIALIZED, RET_ERR(PM_ERR_TRANS_NOT_INITIALIZED, -1));

        if(!alpm_list_find_ptr(handle->dbs_sync, db)) {
                RET_ERR(PM_ERR_DB_NOT_FOUND, -1);
        }

        len = strlen(db->treename) + 4;
        MALLOC(dbfile, len, RET_ERR(PM_ERR_MEMORY, -1));
        sprintf(dbfile, "%s.db", db->treename);

        dbpath = alpm_option_get_dbpath();
        len = strlen(dbpath) + 6;
        MALLOC(syncpath, len, RET_ERR(PM_ERR_MEMORY, -1));
        sprintf(syncpath, "%s%s", dbpath, "sync/");

        ret = _alpm_download_single_file(dbfile, db->servers, syncpath, force);
        free(dbfile);
        free(syncpath);

        if(ret == 1) {
                /* files match, do nothing */
                pm_errno = 0;
                return(1);
        } else if(ret == -1) {
                /* pm_errno was set by the download code */
                _alpm_log(PM_LOG_DEBUG, "failed to sync db: %s\n", alpm_strerrorlast());
                return(-1);
        }

        syncdbpath = _alpm_db_path(db);

        /* form the path to the db location */
        len = strlen(dbpath) + strlen(db->treename) + 9;
        MALLOC(dbfilepath, len, RET_ERR(PM_ERR_MEMORY, -1));
        sprintf(dbfilepath, "%ssync/%s.db", dbpath, db->treename);

        if(force) {
                /* if forcing update, remove the old dir and extract the db */
                if(_alpm_rmrf(syncdbpath) != 0) {
                        _alpm_log(PM_LOG_ERROR, _("could not remove database %s\n"), db->treename);
                        RET_ERR(PM_ERR_DB_REMOVE, -1);
                } else {
                        _alpm_log(PM_LOG_DEBUG, "database dir %s removed\n", _alpm_db_path(db));
                }
        } else {
                /* if not forcing, only remove and extract what is necessary */
                ret = dirlist_from_tar(dbfilepath, &newdirlist);
                if(ret) {
                        goto cleanup;
                }
                ret = dirlist_from_fs(syncdbpath, &olddirlist);
                if(ret) {
                        goto cleanup;
                }

                alpm_list_diff_sorted(olddirlist, newdirlist, _alpm_str_cmp, &onlyold, &onlynew);

                ret = remove_olddir(syncdbpath, onlyold);
                if(ret) {
                        goto cleanup;
                }
        }

        /* Cache needs to be rebuilt */
        _alpm_db_free_pkgcache(db);

        checkdbdir(db);
        ret = _alpm_unpack(dbfilepath, syncdbpath, onlynew, 0);

cleanup:
        FREELIST(newdirlist);
        FREELIST(olddirlist);
        alpm_list_free(onlynew);
        alpm_list_free(onlyold);

        free(dbfilepath);

        if(ret) {
                RET_ERR(PM_ERR_SYSTEM, -1);
        }

        return(0);
}


static int splitname(const char *target, pmpkg_t *pkg)
{
        /* the format of a db entry is as follows:
         *    package-version-rel/
         * package name can contain hyphens, so parse from the back- go back
         * two hyphens and we have split the version from the name.
         */
        char *tmp, *p, *q;

        if(target == NULL || pkg == NULL) {
                return(-1);
        }
        STRDUP(tmp, target, RET_ERR(PM_ERR_MEMORY, -1));
        p = tmp + strlen(tmp);

        /* do the magic parsing- find the beginning of the version string
         * by doing two iterations of same loop to lop off two hyphens */
        for(q = --p; *q && *q != '-'; q--);
        for(p = --q; *p && *p != '-'; p--);
        if(*p != '-' || p == tmp) {
                return(-1);
        }

        /* copy into fields and return */
        if(pkg->version) {
                FREE(pkg->version);
        }
        STRDUP(pkg->version, p+1, RET_ERR(PM_ERR_MEMORY, -1));
        /* insert a terminator at the end of the name (on hyphen)- then copy it */
        *p = '\0';
        if(pkg->name) {
                FREE(pkg->name);
        }
        STRDUP(pkg->name, tmp, RET_ERR(PM_ERR_MEMORY, -1));

        free(tmp);
        return(0);
}

int _alpm_db_populate(pmdb_t *db)
{
        int count = 0;
        struct dirent *ent = NULL;
        const char *dbpath;
        DIR *dbdir;

        ALPM_LOG_FUNC;

        ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));

        dbpath = _alpm_db_path(db);
        dbdir = opendir(dbpath);
        if(dbdir == NULL) {
                return(0);
        }
        while((ent = readdir(dbdir)) != NULL) {
                const char *name = ent->d_name;
                pmpkg_t *pkg;

                if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) {
                        continue;
                }
                if(!is_dir(dbpath, ent)) {
                        continue;
                }

                pkg = _alpm_pkg_new();
                if(pkg == NULL) {
                        closedir(dbdir);
                        return(-1);
                }
                /* split the db entry name */
                if(splitname(name, pkg) != 0) {
                        _alpm_log(PM_LOG_ERROR, _("invalid name for database entry '%s'\n"),
                                        name);
                        _alpm_pkg_free(pkg);
                        continue;
                }

                /* duplicated database entries are not allowed */
                if(_alpm_pkg_find(db->pkgcache, pkg->name)) {
                        _alpm_log(PM_LOG_ERROR, _("duplicated database entry '%s'\n"), pkg->name);
                        _alpm_pkg_free(pkg);
                        continue;
                }

                /* explicitly read with only 'BASE' data, accessors will handle the rest */
                if(_alpm_db_read(db, pkg, INFRQ_BASE) == -1) {
                        _alpm_log(PM_LOG_ERROR, _("corrupted database entry '%s'\n"), name);
                        _alpm_pkg_free(pkg);
                        continue;
                }
                if(db == handle->db_local) {
                        pkg->origin = PKG_FROM_LOCALDB;
                        pkg->ops = &local_pkg_ops;
                }  else {
                        pkg->origin = PKG_FROM_SYNCDB;
                        pkg->ops = &sync_pkg_ops;
                }
                pkg->origin_data.db = db;
                /* add to the collection */
                _alpm_log(PM_LOG_FUNCTION, "adding '%s' to package cache for db '%s'\n",
                                pkg->name, db->treename);
                db->pkgcache = alpm_list_add(db->pkgcache, pkg);
                count++;
        }

        closedir(dbdir);
        db->pkgcache = alpm_list_msort(db->pkgcache, count, _alpm_pkg_cmp);
        return(count);
}

/* Note: the return value must be freed by the caller */
static char *get_pkgpath(pmdb_t *db, pmpkg_t *info)
{
        size_t len;
        char *pkgpath;
        const char *dbpath;

        dbpath = _alpm_db_path(db);
        len = strlen(dbpath) + strlen(info->name) + strlen(info->version) + 3;
        MALLOC(pkgpath, len, RET_ERR(PM_ERR_MEMORY, NULL));
        sprintf(pkgpath, "%s%s-%s/", dbpath, info->name, info->version);
        return(pkgpath);
}

int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
{
        FILE *fp = NULL;
        char path[PATH_MAX];
        char line[1024];
        char *pkgpath = NULL;

        ALPM_LOG_FUNC;

        if(db == NULL) {
                RET_ERR(PM_ERR_DB_NULL, -1);
        }

        if(info == NULL || info->name == NULL || info->version == NULL) {
                _alpm_log(PM_LOG_DEBUG, "invalid package entry provided to _alpm_db_read, skipping\n");
                return(-1);
        }

        if(info->origin == PKG_FROM_FILE) {
                _alpm_log(PM_LOG_DEBUG, "request to read database info for a file-based package '%s', skipping...\n", info->name);
                return(-1);
        }

        /* bitmask logic here:
         * infolevel: 00001111
         * inforeq:   00010100
         * & result:  00000100
         * == to inforeq? nope, we need to load more info. */
        if((info->infolevel & inforeq) == inforeq) {
                /* already loaded this info, do nothing */
                return(0);
        }
        _alpm_log(PM_LOG_FUNCTION, "loading package data for %s : level=0x%x\n",
                        info->name, inforeq);

        /* clear out 'line', to be certain - and to make valgrind happy */
        memset(line, 0, sizeof(line));

        pkgpath = get_pkgpath(db, info);

        if(access(pkgpath, F_OK)) {
                /* directory doesn't exist or can't be opened */
                _alpm_log(PM_LOG_DEBUG, "cannot find '%s-%s' in db '%s'\n",
                                info->name, info->version, db->treename);
                goto error;
        }

        /* DESC */
        if(inforeq & INFRQ_DESC) {
                snprintf(path, PATH_MAX, "%sdesc", pkgpath);
                if((fp = fopen(path, "r")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        goto error;
                }
                while(!feof(fp)) {
                        if(fgets(line, sizeof(line), fp) == NULL) {
                                break;
                        }
                        _alpm_strtrim(line);
                        if(strcmp(line, "%NAME%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                if(strcmp(_alpm_strtrim(line), info->name) != 0) {
                                        _alpm_log(PM_LOG_ERROR, _("%s database is inconsistent: name "
                                                                "mismatch on package %s\n"), db->treename, info->name);
                                }
                        } else if(strcmp(line, "%VERSION%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                if(strcmp(_alpm_strtrim(line), info->version) != 0) {
                                        _alpm_log(PM_LOG_ERROR, _("%s database is inconsistent: version "
                                                                "mismatch on package %s\n"), db->treename, info->name);
                                }
                        } else if(strcmp(line, "%FILENAME%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->filename, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%DESC%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->desc, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%GROUPS%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->groups = alpm_list_add(info->groups, linedup);
                                }
                        } else if(strcmp(line, "%URL%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->url, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%LICENSE%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->licenses = alpm_list_add(info->licenses, linedup);
                                }
                        } else if(strcmp(line, "%ARCH%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->arch, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%BUILDDATE%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                _alpm_strtrim(line);

                                char first = tolower((unsigned char)line[0]);
                                if(first > 'a' && first < 'z') {
                                        struct tm tmp_tm = {0}; /* initialize to null in case of failure */
                                        setlocale(LC_TIME, "C");
                                        strptime(line, "%a %b %e %H:%M:%S %Y", &tmp_tm);
                                        info->builddate = mktime(&tmp_tm);
                                        setlocale(LC_TIME, "");
                                } else {
                                        info->builddate = atol(line);
                                }
                        } else if(strcmp(line, "%INSTALLDATE%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                _alpm_strtrim(line);

                                char first = tolower((unsigned char)line[0]);
                                if(first > 'a' && first < 'z') {
                                        struct tm tmp_tm = {0}; /* initialize to null in case of failure */
                                        setlocale(LC_TIME, "C");
                                        strptime(line, "%a %b %e %H:%M:%S %Y", &tmp_tm);
                                        info->installdate = mktime(&tmp_tm);
                                        setlocale(LC_TIME, "");
                                } else {
                                        info->installdate = atol(line);
                                }
                        } else if(strcmp(line, "%PACKAGER%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->packager, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%REASON%") == 0) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                info->reason = (pmpkgreason_t)atol(_alpm_strtrim(line));
                        } else if(strcmp(line, "%SIZE%") == 0 || strcmp(line, "%CSIZE%") == 0) {
                                /* NOTE: the CSIZE and SIZE fields both share the "size" field
                                 *       in the pkginfo_t struct.  This can be done b/c CSIZE
                                 *       is currently only used in sync databases, and SIZE is
                                 *       only used in local databases.
                                 */
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                info->size = atol(_alpm_strtrim(line));
                                /* also store this value to isize if isize is unset */
                                if(info->isize == 0) {
                                        info->isize = info->size;
                                }
                        } else if(strcmp(line, "%ISIZE%") == 0) {
                                /* ISIZE (installed size) tag only appears in sync repositories,
                                 * not the local one. */
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                info->isize = atol(_alpm_strtrim(line));
                        } else if(strcmp(line, "%MD5SUM%") == 0) {
                                /* MD5SUM tag only appears in sync repositories,
                                 * not the local one. */
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        goto error;
                                }
                                STRDUP(info->md5sum, _alpm_strtrim(line), goto error);
                        } else if(strcmp(line, "%REPLACES%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->replaces = alpm_list_add(info->replaces, linedup);
                                }
                        } else if(strcmp(line, "%FORCE%") == 0) {
                                info->force = 1;
                        }
                }
                fclose(fp);
                fp = NULL;
        }

        /* FILES */
        if(inforeq & INFRQ_FILES) {
                snprintf(path, PATH_MAX, "%sfiles", pkgpath);
                if((fp = fopen(path, "r")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        goto error;
                }
                while(fgets(line, sizeof(line), fp)) {
                        _alpm_strtrim(line);
                        if(strcmp(line, "%FILES%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->files = alpm_list_add(info->files, linedup);
                                }
                        } else if(strcmp(line, "%BACKUP%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->backup = alpm_list_add(info->backup, linedup);
                                }
                        }
                }
                fclose(fp);
                fp = NULL;
        }

        /* DEPENDS */
        if(inforeq & INFRQ_DEPENDS) {
                snprintf(path, PATH_MAX, "%sdepends", pkgpath);
                if((fp = fopen(path, "r")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        goto error;
                }
                while(!feof(fp)) {
                        if(fgets(line, sizeof(line), fp) == NULL) {
                                break;
                        }
                        _alpm_strtrim(line);
                        if(strcmp(line, "%DEPENDS%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        pmdepend_t *dep = _alpm_splitdep(_alpm_strtrim(line));
                                        info->depends = alpm_list_add(info->depends, dep);
                                }
                        } else if(strcmp(line, "%OPTDEPENDS%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->optdepends = alpm_list_add(info->optdepends, linedup);
                                }
                        } else if(strcmp(line, "%CONFLICTS%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->conflicts = alpm_list_add(info->conflicts, linedup);
                                }
                        } else if(strcmp(line, "%PROVIDES%") == 0) {
                                while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                        char *linedup;
                                        STRDUP(linedup, _alpm_strtrim(line), goto error);
                                        info->provides = alpm_list_add(info->provides, linedup);
                                }
                        }
                }
                fclose(fp);
                fp = NULL;
        }

        /* DELTAS */
        if(inforeq & INFRQ_DELTAS) {
                snprintf(path, PATH_MAX, "%sdeltas", pkgpath);
                if((fp = fopen(path, "r"))) {
                        while(!feof(fp)) {
                                if(fgets(line, sizeof(line), fp) == NULL) {
                                        break;
                                }
                                _alpm_strtrim(line);
                                if(strcmp(line, "%DELTAS%") == 0) {
                                        while(fgets(line, sizeof(line), fp) && strlen(_alpm_strtrim(line))) {
                                                pmdelta_t *delta = _alpm_delta_parse(line);
                                                if(delta) {
                                                        info->deltas = alpm_list_add(info->deltas, delta);
                                                }
                                        }
                                }
                        }
                        fclose(fp);
                        fp = NULL;
                }
        }

        /* INSTALL */
        if(inforeq & INFRQ_SCRIPTLET) {
                snprintf(path, PATH_MAX, "%sinstall", pkgpath);
                if(access(path, F_OK) == 0) {
                        info->scriptlet = 1;
                }
        }

        /* internal */
        info->infolevel |= inforeq;

        free(pkgpath);
        return(0);

error:
        free(pkgpath);
        if(fp) {
                fclose(fp);
        }
        return(-1);
}

int _alpm_db_prepare(pmdb_t *db, pmpkg_t *info)
{
        mode_t oldmask;
        int retval = 0;
        char *pkgpath = NULL;

        if(checkdbdir(db) != 0) {
                return(-1);
        }

        oldmask = umask(0000);
        pkgpath = get_pkgpath(db, info);

        if((retval = mkdir(pkgpath, 0755)) != 0) {
                _alpm_log(PM_LOG_ERROR, _("could not create directory %s: %s\n"),
                                pkgpath, strerror(errno));
        }

        free(pkgpath);
        umask(oldmask);

        return(retval);
}

int _alpm_db_write(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq)
{
        FILE *fp = NULL;
        char path[PATH_MAX];
        mode_t oldmask;
        alpm_list_t *lp = NULL;
        int retval = 0;
        int local = 0;
        char *pkgpath = NULL;

        ALPM_LOG_FUNC;

        if(db == NULL || info == NULL) {
                return(-1);
        }

        pkgpath = get_pkgpath(db, info);

        /* make sure we have a sane umask */
        oldmask = umask(0022);

        if(strcmp(db->treename, "local") == 0) {
                local = 1;
        }

        /* DESC */
        if(inforeq & INFRQ_DESC) {
                _alpm_log(PM_LOG_DEBUG, "writing %s-%s DESC information back to db\n",
                                info->name, info->version);
                snprintf(path, PATH_MAX, "%sdesc", pkgpath);
                if((fp = fopen(path, "w")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        retval = -1;
                        goto cleanup;
                }
                fprintf(fp, "%%NAME%%\n%s\n\n"
                                                "%%VERSION%%\n%s\n\n", info->name, info->version);
                if(info->desc) {
                        fprintf(fp, "%%DESC%%\n"
                                                        "%s\n\n", info->desc);
                }
                if(info->groups) {
                        fputs("%GROUPS%\n", fp);
                        for(lp = info->groups; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                if(info->replaces) {
                        fputs("%REPLACES%\n", fp);
                        for(lp = info->replaces; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                if(info->force) {
                        fprintf(fp, "%%FORCE%%\n\n");
                }
                if(local) {
                        if(info->url) {
                                fprintf(fp, "%%URL%%\n"
                                                                "%s\n\n", info->url);
                        }
                        if(info->licenses) {
                                fputs("%LICENSE%\n", fp);
                                for(lp = info->licenses; lp; lp = lp->next) {
                                        fprintf(fp, "%s\n", (char *)lp->data);
                                }
                                fprintf(fp, "\n");
                        }
                        if(info->arch) {
                                fprintf(fp, "%%ARCH%%\n"
                                                                "%s\n\n", info->arch);
                        }
                        if(info->builddate) {
                                fprintf(fp, "%%BUILDDATE%%\n"
                                                                "%ld\n\n", info->builddate);
                        }
                        if(info->installdate) {
                                fprintf(fp, "%%INSTALLDATE%%\n"
                                                                "%ld\n\n", info->installdate);
                        }
                        if(info->packager) {
                                fprintf(fp, "%%PACKAGER%%\n"
                                                                "%s\n\n", info->packager);
                        }
                        if(info->isize) {
                                /* only write installed size, csize is irrelevant once installed */
                                fprintf(fp, "%%SIZE%%\n"
                                                                "%jd\n\n", (intmax_t)info->isize);
                        }
                        if(info->reason) {
                                fprintf(fp, "%%REASON%%\n"
                                                                "%u\n\n", info->reason);
                        }
                } else {
                        if(info->size) {
                                fprintf(fp, "%%CSIZE%%\n"
                                                                "%jd\n\n", (intmax_t)info->size);
                        }
                        if(info->isize) {
                                fprintf(fp, "%%ISIZE%%\n"
                                                                "%jd\n\n", (intmax_t)info->isize);
                        }
                        if(info->md5sum) {
                                fprintf(fp, "%%MD5SUM%%\n"
                                                                "%s\n\n", info->md5sum);
                        }
                }
                fclose(fp);
                fp = NULL;
        }

        /* FILES */
        if(local && (inforeq & INFRQ_FILES)) {
                _alpm_log(PM_LOG_DEBUG, "writing %s-%s FILES information back to db\n",
                                info->name, info->version);
                snprintf(path, PATH_MAX, "%sfiles", pkgpath);
                if((fp = fopen(path, "w")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        retval = -1;
                        goto cleanup;
                }
                if(info->files) {
                        fprintf(fp, "%%FILES%%\n");
                        for(lp = info->files; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                if(info->backup) {
                        fprintf(fp, "%%BACKUP%%\n");
                        for(lp = info->backup; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                fclose(fp);
                fp = NULL;
        }

        /* DEPENDS */
        if(inforeq & INFRQ_DEPENDS) {
                _alpm_log(PM_LOG_DEBUG, "writing %s-%s DEPENDS information back to db\n",
                        info->name, info->version);
                snprintf(path, PATH_MAX, "%sdepends", pkgpath);
                if((fp = fopen(path, "w")) == NULL) {
                        _alpm_log(PM_LOG_ERROR, _("could not open file %s: %s\n"), path, strerror(errno));
                        retval = -1;
                        goto cleanup;
                }
                if(info->depends) {
                        fputs("%DEPENDS%\n", fp);
                        for(lp = info->depends; lp; lp = lp->next) {
                                char *depstring = alpm_dep_compute_string(lp->data);
                                fprintf(fp, "%s\n", depstring);
                                free(depstring);
                        }
                        fprintf(fp, "\n");
                }
                if(info->optdepends) {
                        fputs("%OPTDEPENDS%\n", fp);
                        for(lp = info->optdepends; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                if(info->conflicts) {
                        fputs("%CONFLICTS%\n", fp);
                        for(lp = info->conflicts; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                if(info->provides) {
                        fputs("%PROVIDES%\n", fp);
                        for(lp = info->provides; lp; lp = lp->next) {
                                fprintf(fp, "%s\n", (char *)lp->data);
                        }
                        fprintf(fp, "\n");
                }
                fclose(fp);
                fp = NULL;
        }

        /* INSTALL */
        /* nothing needed here (script is automatically extracted) */

cleanup:
        umask(oldmask);
        free(pkgpath);

        if(fp) {
                fclose(fp);
        }

        return(retval);
}

int _alpm_db_remove(pmdb_t *db, pmpkg_t *info)
{
        int ret = 0;
        char *pkgpath = NULL;

        ALPM_LOG_FUNC;

        if(db == NULL || info == NULL) {
                RET_ERR(PM_ERR_DB_NULL, -1);
        }

        pkgpath = get_pkgpath(db, info);

        ret = _alpm_rmrf(pkgpath);
        free(pkgpath);
        if(ret != 0) {
                ret = -1;
        }
        return(ret);
}

/* vim: set ts=2 sw=2 noet: */