path: root/shell/e-shell-migrate.c

/*
 * e-shell-migrate.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include "e-shell-migrate.h"

#include <string.h>
#include <unistd.h>
#include <glib/gi18n.h>
#include <glib/gstdio.h>
#include <libedataserver/e-xml-utils.h>

#include "e-util/e-bconf-map.h"
#include "e-util/e-error.h"
#include "e-util/e-fsutils.h"
#include "e-util/e-util.h"

#include "es-event.h"

#define GCONF_VERSION_KEY   "/apps/evolution/version"
#define GCONF_LAST_VERSION_KEY  "/apps/evolution/last_version"

static const gchar *
shell_migrate_get_old_data_dir (void)
{
    static gchar *old_data_dir = NULL;

    if (G_UNLIKELY (old_data_dir == NULL))
        old_data_dir = g_build_filename (
            g_get_home_dir (), "evolution", NULL);

    return old_data_dir;
}

static gboolean
shell_migrate_attempt (EShell *shell,
                       gint major,
                       gint minor,
                       gint micro)
{
    GList *backends;
    gboolean success = TRUE;

    backends = e_shell_get_shell_backends (shell);

    while (success && backends != NULL) {
        EShellBackend *shell_backend = backends->data;
        GError *error = NULL;

        success = e_shell_backend_migrate (
            shell_backend, major, minor, micro, &error);

        if (error != NULL) {
            gint response;

            response = e_error_run (
                NULL, "shell:upgrade-failed",
                error->message, NULL);

            if (response == GTK_RESPONSE_CANCEL)
                success = FALSE;

            g_error_free (error);
        }

        backends = g_list_next (backends);
    }

    return success;
}

static void
shell_migrate_get_version (EShell *shell,
                           gint *major,
                           gint *minor,
                           gint *micro)
{
    GConfClient *client;
    const gchar *key;
    const gchar *old_data_dir;
    gchar *string;

    old_data_dir = shell_migrate_get_old_data_dir ();

    key = GCONF_VERSION_KEY;
    client = e_shell_get_gconf_client (shell);
    string = gconf_client_get_string (client, key, NULL);

    if (string != NULL) {
        /* Since 1.4.0 we've kept the version key in GConf. */
        sscanf (string, "%d.%d.%d", major, minor, micro);
        g_free (string);

    } else if (!g_file_test (old_data_dir, G_FILE_TEST_IS_DIR)) {
        /* If the old data directory does not exist,
         * it must be a new installation. */
        *major = 0;
        *minor = 0;
        *micro = 0;

    } else {
        xmlDocPtr doc;
        xmlNodePtr source;
        gchar *filename;

        filename = g_build_filename (
            old_data_dir, "config.xmldb", NULL);
        doc = e_xml_parse_file (filename);
        g_free (filename);

        if (doc == NULL)
            return;

        source = e_bconf_get_path (doc, "/Shell");
        if (source != NULL) {
            key = "upgrade_from_1_0_to_1_2_performed";
            string = e_bconf_get_value (source, key);
        }

        if (string != NULL && *string == '1') {
            *major = 1;
            *minor = 2;
            *micro = 0;
        } else {
            *major = 1;
            *minor = 0;
            *micro = 0;
        }

        g_free (string);

        if (doc != NULL)
            xmlFreeDoc (doc);
    }
}

static gint
shell_migrate_remove_dir (const gchar *root,
                          const gchar *path)
{
    GDir *dir;
    const gchar *basename;
    gchar *filename;
    gint result = -1;

    /* Recursively removes a directory and its contents. */

    dir = g_dir_open (path, 0, NULL);
    if (dir == NULL)
        return -1;

    while ((basename = g_dir_read_name (dir)) != NULL) {
        filename = g_build_filename (path, basename, NULL);

        /* Make sure we haven't strayed from the evolution dir. */
        g_return_val_if_fail (strlen (path) >= strlen (root), -1);
        g_return_val_if_fail (g_str_has_prefix (path, root), -1);

        if (g_file_test (filename, G_FILE_TEST_IS_DIR)) {
            if (shell_migrate_remove_dir (root, filename) < 0)
                goto fail;
        } else {
            if (g_unlink (filename) < 0)
                goto fail;
        }

        g_free (filename);
        filename = NULL;
    }

    result = g_rmdir (path);

fail:
    g_free (filename);
    g_dir_close (dir);

    return result;
}

gboolean
e_shell_migrate_attempt (EShell *shell)
{
    ESEvent *ese;
    GConfClient *client;
    const gchar *key;
    const gchar *old_data_dir;
    gint major, minor, micro;
    gint last_major, last_minor, last_micro;
    gint curr_major, curr_minor, curr_micro;
    gboolean migrated = FALSE;
    gchar *string;

    g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

    client = e_shell_get_gconf_client (shell);
    old_data_dir = shell_migrate_get_old_data_dir ();

    if (sscanf (BASE_VERSION, "%d.%d", &curr_major, &curr_minor) != 2) {
        g_warning ("Could not parse BASE_VERSION (%s)", BASE_VERSION);
        return TRUE;
    }

    curr_micro = atoi (UPGRADE_REVISION);

    shell_migrate_get_version (shell, &major, &minor, &micro);

    if (!(curr_major > major ||
        (curr_major == major && curr_minor > minor) ||
        (curr_minor == minor && curr_micro > micro)))
        goto check_old;

    /* If upgrading from < 1.5, we need to copy most data from
     * ~/evolution to ~/.evolution.  Make sure we have the disk
     * space for it before proceeding. */
    if (major == 1 && minor < 5) {
        glong avail;
        glong usage;

        usage = e_fsutils_usage (old_data_dir);
        avail = e_fsutils_avail (g_get_home_dir ());
        if (usage >= 0 && avail >= 0 && avail < usage) {
            gchar *need;
            gchar *have;

            need = g_strdup_printf (_("%ld KB"), usage);
            have = g_strdup_printf (_("%ld KB"), avail);

            e_error_run (
                NULL, "shell:upgrade-nospace",
                need, have, NULL);

            g_free (need);
            g_free (have);

            _exit (EXIT_SUCCESS);
        }
    }

    if (!shell_migrate_attempt (shell, major, minor, micro))
        _exit (EXIT_SUCCESS);

    /* Record a successful migration. */
    string = g_strdup_printf ("%d.%d.%d", major, minor, micro);
    gconf_client_set_string (client, GCONF_VERSION_KEY, string, NULL);
    g_free (string);

    migrated = TRUE;

check_old:

    key = GCONF_LAST_VERSION_KEY;

    /* Try to retrieve the last migrated version from GConf. */
    string = gconf_client_get_string (client, key, NULL);
    if (migrated || string == NULL || sscanf (string, "%d.%d.%d",
        &last_major, &last_minor, &last_micro) != 3) {
        last_major = major;
        last_minor = minor;
        last_micro = micro;
    }
    g_free (string);

    /* If the last migrated version was old, check for stuff to remove. */
    if (last_major == 1 && last_minor < 5 &&
        g_file_test (old_data_dir, G_FILE_TEST_IS_DIR)) {

        gint response;

        string = g_strdup_printf (
            "%d.%d.%d", last_major, last_minor, last_micro);
        response = e_error_run (
            NULL, "shell:upgrade-remove-1-4", string, NULL);
        g_free (string);

        switch (response) {
            case GTK_RESPONSE_OK:  /* delete */
                response = e_error_run (
                    NULL,
                    "shell:upgrade-remove-1-4-confirm",
                    NULL);
                if (response == GTK_RESPONSE_OK)
                    shell_migrate_remove_dir (
                        old_data_dir, old_data_dir);
                else
                    break;
                /* fall through */

            case GTK_RESPONSE_ACCEPT:  /* keep */
                last_major = curr_major;
                last_minor = curr_minor;
                last_micro = curr_micro;
                break;

            default:
                break;
        }
    } else {
        last_major = curr_major;
        last_minor = curr_minor;
        last_micro = curr_micro;
    }

    string = g_strdup_printf (
        "%d.%d.%d", last_major, last_minor, last_micro);
    gconf_client_set_string (client, key, string, NULL);
    g_free (string);

    /** @Event: Shell attempted upgrade
     * @Id: upgrade.done
     * @Target: ESMenuTargetState
     *
     * This event is emitted whenever the shell successfully attempts
     * an upgrade.
     **/
    ese = es_event_peek ();
    e_event_emit (
        (EEvent *) ese, "upgrade.done",
        (EEventTarget *) es_event_target_new_upgrade (
        ese, curr_major, curr_minor, curr_micro));

    return TRUE;
}

GQuark
e_shell_migrate_error_quark (void)
{
    static GQuark quark = 0;

    if (G_UNLIKELY (quark == 0))
        quark = g_quark_from_static_string (
            "e-shell-migrate-error-quark");

    return quark;
}