remove.c

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/*
 *  remove.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 <stdlib.h>
#include <stdio.h>
#include <string.h>

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

/* pacman */
#include "pacman.h"
#include "util.h"
#include "callback.h"
#include "conf.h"

extern pmdb_t *db_local;

/* Free the current transaction and print an error if unsuccessful */
static int remove_cleanup(void)
{
    int ret = alpm_trans_release();
    if(ret != 0) {
        pm_printf(PM_LOG_ERROR, _("failed to release transaction (%s)\n"),
                alpm_strerrorlast());
        ret = 1;
    }

    return(ret);
}

/**
 * @brief Remove a specified list of packages.
 *
 * @param targets a list of packages (as strings) to remove from the system
 *
 * @return 0 on success, 1 on failure
 */
int pacman_remove(alpm_list_t *targets)
{
    alpm_list_t *i, *data = NULL, *finaltargs = NULL;
    int retval = 0;

    if(targets == NULL) {
        pm_printf(PM_LOG_ERROR, _("no targets specified (use -h for help)\n"));
        return(1);
    }

    /* If the target is a group, ask if its packages should be removed
     * (the library can't remove groups for now)
     */
    for(i = targets; i; i = alpm_list_next(i)) {
        pmgrp_t *grp = alpm_db_readgrp(db_local, alpm_list_getdata(i));
        if(grp) {
            int all;
            const alpm_list_t *p, *pkgnames = alpm_grp_get_pkgs(grp);

            printf(_(":: group %s:\n"), alpm_grp_get_name(grp));
            list_display("   ", pkgnames);
            all = yesno(_("    Remove whole content? [Y/n] "));

            for(p = pkgnames; p; p = alpm_list_next(p)) {
                char *pkg = alpm_list_getdata(p);
                if(all || yesno(_(":: Remove %s from group %s? [Y/n] "), pkg, (char *)alpm_list_getdata(i))) {
                    finaltargs = alpm_list_add(finaltargs, strdup(pkg));
                }
            }
        } else {
            /* not a group, so add it to the final targets */
            finaltargs = alpm_list_add(finaltargs, strdup(alpm_list_getdata(i)));
        }
    }

    /* Step 1: create a new transaction */
    if(alpm_trans_init(PM_TRANS_TYPE_REMOVE, config->flags,
       cb_trans_evt, cb_trans_conv, cb_trans_progress) == -1) {
        fprintf(stderr, _("error: failed to init transaction (%s)\n"),
                alpm_strerrorlast());
        if(pm_errno == PM_ERR_HANDLE_LOCK) {
            printf(_("  if you're sure a package manager is not already\n"
                     "  running, you can remove %s.\n"), alpm_option_get_lockfile());
        }
        FREELIST(finaltargs);
        return(1);
    }

    /* add targets to the created transaction */
    printf(_("loading package data... "));
    for(i = finaltargs; i; i = alpm_list_next(i)) {
        char *targ = alpm_list_getdata(i);
        if(alpm_trans_addtarget(targ) == -1) {
            printf("failed.\n");
            fprintf(stderr, _("error: failed to add target '%s' (%s)\n"), targ,
                    alpm_strerrorlast());
            remove_cleanup();
            FREELIST(finaltargs);
            return(1);
        }
    }
    printf(_("done.\n"));

    /* Step 2: prepare the transaction based on its type, targets and flags */
    if(alpm_trans_prepare(&data) == -1) {
        fprintf(stderr, _("error: failed to prepare transaction (%s)\n"),
                alpm_strerrorlast());
        switch(pm_errno) {
            case PM_ERR_UNSATISFIED_DEPS:
                for(i = data; i; i = alpm_list_next(i)) {
                    pmdepmissing_t *miss = alpm_list_getdata(i);
                    pmdepend_t *dep = alpm_miss_get_dep(miss);
                    char *depstring = alpm_dep_get_string(dep);
                    printf(_(":: %s: requires %s\n"), alpm_miss_get_target(miss),
                            depstring);
                    free(depstring);
                }
                FREELIST(data);
                break;
            default:
                break;
        }
        remove_cleanup();
        FREELIST(finaltargs);
        return(1);
    }

    /* Warn user in case of dangerous operation */
    if(config->flags & PM_TRANS_FLAG_RECURSE ||
       config->flags & PM_TRANS_FLAG_CASCADE) {
        /* list transaction targets */
        alpm_list_t *lst = NULL;
        /* create a new list of package names only */
        for(i = alpm_trans_get_pkgs(); i; i = alpm_list_next(i)) {
            pmpkg_t *pkg = alpm_list_getdata(i);
            lst = alpm_list_add(lst, strdup(alpm_pkg_get_name(pkg)));
        }
        printf("\n");
        list_display(_("Targets:"), lst);
        FREELIST(lst);
        /* get confirmation */
        if(yesno(_("\nDo you want to remove these packages? [Y/n] ")) == 0) {
            remove_cleanup();
            FREELIST(finaltargs);
            return(1);
        }
        printf("\n");
    }

    /* Step 3: actually perform the removal */
    if(alpm_trans_commit(NULL) == -1) {
        fprintf(stderr, _("error: failed to commit transaction (%s)\n"),
                alpm_strerrorlast());
        remove_cleanup();
        FREELIST(finaltargs);
        return(1);
    }

    /* Step 4: release transaction resources */
    retval = remove_cleanup();
    FREELIST(finaltargs);
    return(retval);
}

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

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