pacman/src/pacman/remove.c

/*
 *  remove.c
 * 
 *  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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#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 "log.h"
#include "trans.h"
#include "conf.h"

extern config_t *config;

extern pmdb_t *db_local;

/**
 * @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, *j, *data = NULL, *finaltargs = NULL;
	int retval = 0;

	if(targets == NULL) {
		return(0);
	}

	/* 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;
			alpm_list_t *pkgnames = alpm_grp_get_pkgs(grp);

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

			for(j = pkgnames; j; j = alpm_list_next(j)) {
				char *pkg = alpm_list_getdata(j);
				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) {
		ERR(NL, _("failed to init transaction (%s)\n"), alpm_strerror(pm_errno));
		if(pm_errno == PM_ERR_HANDLE_LOCK) {
			MSG(NL, _("       if you're sure a package manager is not already running,\n"
			  			"       you can remove %s%s\n"), alpm_option_get_root(), PM_LOCK);
		}
		FREELIST(finaltargs);
		return(1);
	}

	/* add targets to the created transaction */
	MSG(NL, _("loading package data... "));
	for(i = finaltargs; i; i = alpm_list_next(i)) {
		char *targ = alpm_list_getdata(i);
		if(alpm_trans_addtarget(targ) == -1) {
			/* TODO: glad this output is hacky */
			MSG(NL, "\n");
			ERR(NL, _("failed to add target '%s' (%s)\n"), targ,
			    alpm_strerror(pm_errno));
			retval = 1;
			goto cleanup;
		}
	}

	/* Step 2: prepare the transaction based on its type, targets and flags */
	if(alpm_trans_prepare(&data) == -1) {
		ERR(NL, _("failed to prepare transaction (%s)\n"), alpm_strerror(pm_errno));
		switch(pm_errno) {
			case PM_ERR_UNSATISFIED_DEPS:
				for(i = data; i; i = alpm_list_next(i)) {
					pmdepmissing_t *miss = alpm_list_getdata(i);
					MSG(NL, _(":: %s is required by %s\n"), alpm_dep_get_target(miss),
					    alpm_dep_get_name(miss));
				}
				alpm_list_free(data);
				break;
			default:
				break;
		}
		retval = 1;
		goto cleanup;
	}

	/* 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)));
		}
		MSG(NL, "\n");
		list_display(_("Targets:"), lst);
		FREELIST(lst);
		/* get confirmation */
		if(yesno(_("\nDo you want to remove these packages? [Y/n] ")) == 0) {
			retval = 1;
			goto cleanup;
		}
		MSG(NL, "\n");
	}

	/* Step 3: actually perform the removal */
	if(alpm_trans_commit(NULL) == -1) {
		ERR(NL, _("failed to commit transaction (%s)\n"), alpm_strerror(pm_errno));
		retval = 1;
		goto cleanup;
	}

	/* Step 4: release transaction resources */
cleanup:
	FREELIST(finaltargs);
	if(alpm_trans_release() == -1) {
		ERR(NL, _("failed to release transaction (%s)\n"), alpm_strerror(pm_errno));
		retval = 1;
	}

	return(retval);
}

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