src/pacman/deptest.c


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/*
 *  deptest.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 <libintl.h>
#include <alpm.h>
#include <alpm_list.h>
/* pacman */
#include "util.h"
#include "conf.h"
#include "log.h"
#include "sync.h"
#include "deptest.h"

extern config_t *config;

/* TODO this function is fairly messy, with the obscure return codes and the odd
 * 'dummy' packages and all these messy FREELISTs of synctargs
 */
int pacman_deptest(alpm_list_t *targets)
{
  alpm_list_t *data, *i;
  char *str;
  int retval = 0;

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

  if(config->op_d_vertest) {
    const char *pkga, *pkgb;
    pkga = alpm_list_getdata(targets);
    i = alpm_list_next(targets);
    if(pkga && i && (pkgb = alpm_list_getdata(i))) {
      int ret = alpm_pkg_vercmp(pkga, pkgb);
      printf("%d\n", ret);
      return(ret);
    }
    return(0);
  }

  /* we create a transaction to hold a dummy package to be able to use
   * deps checkings from alpm_trans_prepare() */
  if(alpm_trans_init(PM_TRANS_TYPE_ADD, 0, NULL, NULL, NULL) == -1) {
    ERR(NL, "%s", 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);
    }
    return(1);
  }

  /* We use a hidden facility from alpm_trans_addtarget() to add a dummy
   * target to the transaction (see the library code for details).
   * It allows us to use alpm_trans_prepare() to check dependencies of the
   * given target.
   */
  str = (char *)malloc(strlen("name=dummy|version=1.0-1")+1);
  if(str == NULL) {
    ERR(NL, _("memory allocation failure\n"));
    retval = 1;
    goto cleanup;
  }
  strcpy(str, "name=dummy|version=1.0-1");
  for(i = targets; i; i = alpm_list_next(i)) {
    const char *targ = alpm_list_getdata(i);
    str = (char *)realloc(str, strlen(str)+8+strlen(targ)+1);
    strcat(str, "|depend=");
    strcat(str, targ);
  }
  vprint(_("add target %s\n"), str);
  if(alpm_trans_addtarget(str) == -1) {
    FREE(str);
    ERR(NL, _("could not add target (%s)\n"), alpm_strerror(pm_errno));
    retval = 1;
    goto cleanup;
  }
  FREE(str);

  if(alpm_trans_prepare(&data) == -1) {
    alpm_list_t *synctargs = NULL;
    retval = 126;
    /* return 126 = deps were missing, but successfully resolved
     * return 127 = deps were missing, and failed to resolve; OR
     *            = deps were missing, but no resolution was attempted; OR
     *            = unresolvable conflicts were found
     */
    switch(pm_errno) {
      case PM_ERR_UNSATISFIED_DEPS:
        for(i = data; i; i = alpm_list_next(i)) {
          pmdepmissing_t *miss = alpm_list_getdata(i);
          if(!config->op_d_resolve) {
            MSG(NL, _("requires: %s"), alpm_dep_get_name(miss));
            switch(alpm_dep_get_mod(miss)) {
              case PM_DEP_MOD_ANY:
                break;
              case PM_DEP_MOD_EQ:
                MSG(CL, "=%s", alpm_dep_get_version(miss));
                break;
              case PM_DEP_MOD_GE:
                MSG(CL, ">=%s", alpm_dep_get_version(miss));
                break;
              case PM_DEP_MOD_LE:
                MSG(CL, "<=%s", alpm_dep_get_version(miss));
                break;
            }
            MSG(CL, "\n");
          }
          synctargs = alpm_list_add(synctargs, strdup(alpm_dep_get_name(miss)));
        }
        alpm_list_free(data);
      break;
      case PM_ERR_CONFLICTING_DEPS:
        /* we can't auto-resolve conflicts */
        for(i = data; i; i = alpm_list_next(i)) {
          pmdepmissing_t *miss = alpm_list_getdata(i);
          MSG(NL, _("conflict: %s"), alpm_dep_get_name(miss));
        }
        retval = 127;
        alpm_list_free(data);
      break;
      default:
        retval = 127;
      break;
    }

    /* attempt to resolve missing dependencies */
    /* TODO: handle version comparators (eg, glibc>=2.2.5) */
    if(retval == 126 && synctargs != NULL) {
      if(alpm_trans_release() == -1) {
        ERR(NL, _("could not release transaction (%s)"), alpm_strerror(pm_errno));
        FREELIST(synctargs);
        return(1);
      }
      if(!config->op_d_resolve || pacman_sync(synctargs) != 0) {
        /* error (or -D not used) */
        retval = 127;
      }
      FREELIST(synctargs);
      return(retval);
    }

    FREELIST(synctargs);
  }

cleanup:
  if(!config->op_d_resolve) {
    if(alpm_trans_release() == -1) {
      ERR(NL, _("could not release transaction (%s)"), alpm_strerror(pm_errno));
      retval = 1;
    }
  }

  return(retval);
}

/* vim: set ts=2 sw=2 noet: */