cleanupdelta.c

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/*
 *  cleanupdelta.c : return list of unused delta in a given sync database
 *
 *  Copyright (c) 2011 Pacman Development Team <pacman-dev@archlinux.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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <alpm.h>
#include <alpm_list.h>

#define BASENAME "cleanupdelta"

alpm_handle_t *handle = NULL;

static void cleanup(int signum) {
    if(handle && alpm_release(handle) == -1) {
        fprintf(stderr, "error releasing alpm\n");
    }

    exit(signum);
}

static void output_cb(alpm_loglevel_t level, const char *fmt, va_list args)
{
    if(strlen(fmt)) {
        switch(level) {
            case ALPM_LOG_ERROR: printf("error: "); break;
            case ALPM_LOG_WARNING: printf("warning: "); break;
            //case ALPM_LOG_DEBUG: printf("debug: "); break;
            default: return;
        }
        vprintf(fmt, args);
    }
}


static void checkpkgs(alpm_list_t *pkglist)
{
    alpm_list_t *i, *j;
    for(i = pkglist; i; i = alpm_list_next(i)) {
        alpm_pkg_t *pkg = i->data;
        alpm_list_t *unused = alpm_pkg_unused_deltas(pkg);
        for(j = unused; j; j = alpm_list_next(j)) {
            const char *delta = j->data;
            printf("%s\n", delta);
        }
        alpm_list_free(unused);
    }
}

static void checkdbs(alpm_list_t *dbnames) {
    alpm_db_t *db = NULL;
    alpm_list_t *i;
    const alpm_siglevel_t level = ALPM_SIG_DATABASE | ALPM_SIG_DATABASE_OPTIONAL;

    for(i = dbnames; i; i = alpm_list_next(i)) {
        const char *dbname = i->data;
        db = alpm_db_register_sync(handle, dbname, level);
        if(db == NULL) {
            fprintf(stderr, "error: could not register sync database '%s' (%s)\n",
                    dbname, alpm_strerror(alpm_errno(handle)));
            continue;
        }
        checkpkgs(alpm_db_get_pkgcache(db));
    }

}

static void usage(void) {
    fprintf(stderr, "usage:\n");
    fprintf(stderr,
            "\t%s [-b <pacman db>] core extra ... : check the listed sync databases\n", BASENAME);
    exit(1);
}

int main(int argc, char *argv[])
{
    const char *dbpath = DBPATH;
    alpm_errno_t err;
    int a = 1;
    alpm_list_t *dbnames = NULL;

    while(a < argc) {
        if(strcmp(argv[a], "-b") == 0) {
            if(++a < argc) {
                dbpath = argv[a];
            } else {
                usage();
            }
        }   else if(strcmp(argv[a], "-h") == 0 ||
                strcmp(argv[a], "--help") == 0 ) {
            usage();
        } else {
            dbnames = alpm_list_add(dbnames, argv[a]);
        }
        a++;
    }

    if(!dbnames) {
        usage();
    }

    handle = alpm_initialize(ROOTDIR, dbpath, &err);
    if(!handle) {
        fprintf(stderr, "cannot initialize alpm: %s\n", alpm_strerror(err));
        return 1;
    }

    /* let us get log messages from libalpm */
    alpm_option_set_logcb(handle, output_cb);

    checkdbs(dbnames);
    alpm_list_free(dbnames);

    cleanup(0);
}

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