cache.c

Go to the documentation of this file.

/*
 *  cache.c
 *
 *  Copyright (c) 2002-2007 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>

/* libalpm */
#include "cache.h"
#include "alpm_list.h"
#include "log.h"
#include "alpm.h"
#include "util.h"
#include "error.h"
#include "package.h"
#include "group.h"
#include "db.h"

/* Returns a new package cache from db.
 * It frees the cache if it already exists.
 */
int _alpm_db_load_pkgcache(pmdb_t *db)
{
    pmpkg_t *info;
    int count = 0;

    ALPM_LOG_FUNC;

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

    _alpm_db_free_pkgcache(db);

    _alpm_log(PM_LOG_DEBUG, "loading package cache for repository '%s'\n",
              db->treename);

    _alpm_db_rewind(db);
    while((info = _alpm_db_scan(db, NULL)) != NULL) {
        _alpm_log(PM_LOG_FUNCTION, "adding '%s' to package cache for db '%s'\n",
                            alpm_pkg_get_name(info), db->treename);
        info->origin = PKG_FROM_CACHE;
        info->origin_data.db = db;
        /* add to the collection */
        db->pkgcache = alpm_list_add(db->pkgcache, info);
        count++;
    }

    db->pkgcache = alpm_list_msort(db->pkgcache, count, _alpm_pkg_cmp);
    return(0);
}

void _alpm_db_free_pkgcache(pmdb_t *db)
{
    ALPM_LOG_FUNC;

    if(db == NULL || db->pkgcache == NULL) {
        return;
    }

    _alpm_log(PM_LOG_DEBUG, "freeing package cache for repository '%s'\n",
                            db->treename);

    alpm_list_t *tmp;
    for(tmp = db->pkgcache; tmp; tmp = alpm_list_next(tmp)) {
        _alpm_pkg_free(tmp->data);
    }
    alpm_list_free(db->pkgcache);
    db->pkgcache = NULL;

    if(db->grpcache) {
        _alpm_db_free_grpcache(db);
    }
}

alpm_list_t *_alpm_db_get_pkgcache(pmdb_t *db)
{
    ALPM_LOG_FUNC;

    if(db == NULL) {
        return(NULL);
    }

    if(!db->pkgcache) {
        _alpm_db_load_pkgcache(db);
    }

    /* hmmm, still NULL ?*/
    if(!db->pkgcache) {
        _alpm_log(PM_LOG_DEBUG, "error: pkgcache is NULL for db '%s'\n", db->treename);
    }

    return(db->pkgcache);
}

int _alpm_db_add_pkgincache(pmdb_t *db, pmpkg_t *pkg)
{
    pmpkg_t *newpkg;

    ALPM_LOG_FUNC;

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

    newpkg = _alpm_pkg_dup(pkg);
    if(newpkg == NULL) {
        return(-1);
    }
    _alpm_log(PM_LOG_DEBUG, "adding entry '%s' in '%s' cache\n",
                        alpm_pkg_get_name(newpkg), db->treename);
    db->pkgcache = alpm_list_add_sorted(db->pkgcache, newpkg, _alpm_pkg_cmp);

    _alpm_db_free_grpcache(db);

    return(0);
}

int _alpm_db_remove_pkgfromcache(pmdb_t *db, pmpkg_t *pkg)
{
    void *vdata;
    pmpkg_t *data;

    ALPM_LOG_FUNC;

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

    _alpm_log(PM_LOG_DEBUG, "removing entry '%s' from '%s' cache\n",
                        alpm_pkg_get_name(pkg), db->treename);

    db->pkgcache = alpm_list_remove(db->pkgcache, pkg, _alpm_pkg_cmp, &vdata);
    data = vdata;
    if(data == NULL) {
        /* package not found */
        _alpm_log(PM_LOG_DEBUG, "cannot remove entry '%s' from '%s' cache: not found\n",
                            alpm_pkg_get_name(pkg), db->treename);
        return(-1);
    }

    _alpm_pkg_free(data);

    _alpm_db_free_grpcache(db);

    return(0);
}

pmpkg_t *_alpm_db_get_pkgfromcache(pmdb_t *db, const char *target)
{
    ALPM_LOG_FUNC;

    if(db == NULL) {
        return(NULL);
    }

    alpm_list_t *pkgcache = _alpm_db_get_pkgcache(db);
    if(!pkgcache) {
        _alpm_log(PM_LOG_DEBUG, "error: failed to get '%s' from NULL pkgcache\n",
                target);
        return(NULL);
    }

    return(_alpm_pkg_find(target, pkgcache));
}

/* Returns a new group cache from db.
 */
int _alpm_db_load_grpcache(pmdb_t *db)
{
    alpm_list_t *lp;

    ALPM_LOG_FUNC;

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

    if(db->pkgcache == NULL) {
        _alpm_db_load_pkgcache(db);
    }

    _alpm_log(PM_LOG_DEBUG, "loading group cache for repository '%s'\n",
            db->treename);

    for(lp = _alpm_db_get_pkgcache(db); lp; lp = lp->next) {
        const alpm_list_t *i;
        pmpkg_t *pkg = lp->data;

        for(i = alpm_pkg_get_groups(pkg); i; i = i->next) {
            if(!alpm_list_find_str(db->grpcache, i->data)) {
                pmgrp_t *grp = _alpm_grp_new();

                strncpy(grp->name, i->data, GRP_NAME_LEN);
                grp->name[GRP_NAME_LEN-1] = '\0';
                grp->packages = alpm_list_add_sorted(grp->packages,
                                                                                         /* gross signature forces us to
                                                                                            * discard const */
                                                                                         (void*)alpm_pkg_get_name(pkg),
                                                                                         _alpm_str_cmp);
                db->grpcache = alpm_list_add_sorted(db->grpcache, grp, _alpm_grp_cmp);
            } else {
                alpm_list_t *j;

                for(j = db->grpcache; j; j = j->next) {
                    pmgrp_t *grp = j->data;

                    if(strcmp(grp->name, i->data) == 0) {
                        const char *pkgname = alpm_pkg_get_name(pkg);
                        if(!alpm_list_find_str(grp->packages, pkgname)) {
                            grp->packages = alpm_list_add_sorted(grp->packages,
                                                                 (void*)pkgname,
                                                                                                     _alpm_str_cmp);
                        }
                    }
                }
            }
        }
    }

    return(0);
}

void _alpm_db_free_grpcache(pmdb_t *db)
{
    alpm_list_t *lg;

    ALPM_LOG_FUNC;

    if(db == NULL || db->grpcache == NULL) {
        return;
    }

    for(lg = db->grpcache; lg; lg = lg->next) {
        pmgrp_t *grp = lg->data;

        alpm_list_free(grp->packages);
        grp->packages = NULL;
        _alpm_grp_free(lg->data);
        lg->data = NULL;
    }
    FREELIST(db->grpcache);
}

alpm_list_t *_alpm_db_get_grpcache(pmdb_t *db)
{
    ALPM_LOG_FUNC;

    if(db == NULL) {
        return(NULL);
    }

    if(db->grpcache == NULL) {
        _alpm_db_load_grpcache(db);
    }

    return(db->grpcache);
}

pmgrp_t *_alpm_db_get_grpfromcache(pmdb_t *db, const char *target)
{
    alpm_list_t *i;

    ALPM_LOG_FUNC;

    if(db == NULL || target == NULL || strlen(target) == 0) {
        return(NULL);
    }

    for(i = _alpm_db_get_grpcache(db); i; i = i->next) {
        pmgrp_t *info = i->data;

        if(strcmp(info->name, target) == 0) {
            return(info);
        }
    }

    return(NULL);
}

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

---