src/pacman/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: '%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: */