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

/*
 * e-mail-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)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-migrate.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <utime.h>
#include <unistd.h>
#include <dirent.h>
#include <regex.h>
#include <errno.h>
#include <ctype.h>

#include <glib/gi18n.h>
#include <glib/gstdio.h>

#include <gtk/gtk.h>

#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>

#include "shell/e-shell.h"
#include "shell/e-shell-migrate.h"

#include "libemail-engine/e-mail-folder-utils.h"

#include "e-mail-backend.h"
#include "em-utils.h"

#define d(x) x

/* 1.4 upgrade functions */

static GtkProgressBar *progress;

static void
em_migrate_set_progress (double percent)
{
    gchar text[5];

    snprintf (text, sizeof (text), "%d%%", (gint) (percent * 100.0f));

    gtk_progress_bar_set_fraction (progress, percent);
    gtk_progress_bar_set_text (progress, text);

    while (gtk_events_pending ())
        gtk_main_iteration ();
}

enum {
    CP_UNIQUE = 0,
    CP_OVERWRITE,
    CP_APPEND
};

static gint open_flags[3] = {
    O_WRONLY | O_CREAT | O_TRUNC,
    O_WRONLY | O_CREAT | O_TRUNC,
    O_WRONLY | O_CREAT | O_APPEND,
};

static gboolean
cp (const gchar *src,
    const gchar *dest,
    gboolean show_progress,
    gint mode)
{
    guchar readbuf[65536];
    gssize nread, nwritten;
    gint errnosav, readfd, writefd;
    gsize total = 0;
    struct stat st;
    struct utimbuf ut;

    /* if the dest file exists and has content, abort - we don't
     * want to corrupt their existing data */
    if (g_stat (dest, &st) == 0 && st.st_size > 0 && mode == CP_UNIQUE) {
        errno = EEXIST;
        return FALSE;
    }

    if (g_stat (src, &st) == -1
        || (readfd = g_open (src, O_RDONLY | O_BINARY, 0)) == -1)
        return FALSE;

    if ((writefd = g_open (dest, open_flags[mode] | O_BINARY, 0666)) == -1) {
        errnosav = errno;
        close (readfd);
        errno = errnosav;
        return FALSE;
    }

    do {
        do {
            nread = read (readfd, readbuf, sizeof (readbuf));
        } while (nread == -1 && errno == EINTR);

        if (nread == 0)
            break;
        else if (nread < 0)
            goto exception;

        do {
            nwritten = write (writefd, readbuf, nread);
        } while (nwritten == -1 && errno == EINTR);

        if (nwritten < nread)
            goto exception;

        total += nwritten;
        if (show_progress)
            em_migrate_set_progress (((gdouble) total) / ((gdouble) st.st_size));
    } while (total < st.st_size);

    if (fsync (writefd) == -1)
        goto exception;

    close (readfd);
    if (close (writefd) == -1)
        goto failclose;

    ut.actime = st.st_atime;
    ut.modtime = st.st_mtime;
    utime (dest, &ut);
    chmod (dest, st.st_mode);

    return TRUE;

 exception:

    errnosav = errno;
    close (readfd);
    close (writefd);
    errno = errnosav;

 failclose:

    errnosav = errno;
    unlink (dest);
    errno = errnosav;

    return FALSE;
}

static gboolean
emm_setup_initial (const gchar *data_dir)
{
    GDir *dir;
    const gchar *d;
    gchar *local = NULL, *base;
    const gchar * const *language_names;

    /* special-case - this means brand new install of evolution */
    /* FIXME: create default folders and stuff... */

    d (printf ("Setting up initial mail tree\n"));

    base = g_build_filename (data_dir, "local", NULL);
    if (g_mkdir_with_parents (base, 0700) == -1 && errno != EEXIST) {
        g_free (base);
        return FALSE;
    }

    /* e.g. try en-AU then en, etc */
    language_names = g_get_language_names ();
    while (*language_names != NULL) {
        local = g_build_filename (
            EVOLUTION_PRIVDATADIR, "default",
            *language_names, "mail", "local", NULL);
        if (g_file_test (local, G_FILE_TEST_EXISTS))
            break;
        g_free (local);
        language_names++;
    }

    /* Make sure we found one. */
    g_return_val_if_fail (*language_names != NULL, FALSE);

    dir = g_dir_open (local, 0, NULL);
    if (dir) {
        while ((d = g_dir_read_name (dir))) {
            gchar *src, *dest;

            src = g_build_filename (local, d, NULL);
            dest = g_build_filename (base, d, NULL);

            cp (src, dest, FALSE, CP_UNIQUE);
            g_free (dest);
            g_free (src);
        }
        g_dir_close (dir);
    }

    g_free (local);
    g_free (base);

    return TRUE;
}

static void
em_rename_view_in_folder (gpointer data,
                          gpointer user_data)
{
    const gchar *filename = data;
    const gchar *views_dir = user_data;
    gchar *folderpos, *dotpos;

    g_return_if_fail (filename != NULL);
    g_return_if_fail (views_dir != NULL);

    folderpos = strstr (filename, "-folder:__");
    if (!folderpos)
        folderpos = strstr (filename, "-folder___");
    if (!folderpos)
        return;

    /* points on 'f' from the "folder" word */
    folderpos++;
    dotpos = strrchr (filename, '.');
    if (folderpos < dotpos && g_str_equal (dotpos, ".xml")) {
        GChecksum *checksum;
        gchar *oldname, *newname, *newfile;
        const gchar *md5_string;

        *dotpos = 0;

        /* use MD5 checksum of the folder URI, to not depend on its length */
        checksum = g_checksum_new (G_CHECKSUM_MD5);
        g_checksum_update (checksum, (const guchar *) folderpos, -1);

        *folderpos = 0;
        md5_string = g_checksum_get_string (checksum);
        newfile = g_strconcat (filename, md5_string, ".xml", NULL);
        *folderpos = 'f';
        *dotpos = '.';

        oldname = g_build_filename (views_dir, filename, NULL);
        newname = g_build_filename (views_dir, newfile, NULL);

        g_rename (oldname, newname);

        g_checksum_free (checksum);
        g_free (oldname);
        g_free (newname);
        g_free (newfile);
    }
}

static void
em_rename_folder_views (EShellBackend *shell_backend)
{
    const gchar *config_dir;
    gchar *views_dir;
    GDir *dir;

    g_return_if_fail (shell_backend != NULL);

    config_dir = e_shell_backend_get_config_dir (shell_backend);
    views_dir = g_build_filename (config_dir, "views", NULL);

    dir = g_dir_open (views_dir, 0, NULL);
    if (dir) {
        GSList *to_rename = NULL;
        const gchar *filename;

        while (filename = g_dir_read_name (dir), filename) {
            if (strstr (filename, "-folder:__") ||
                strstr (filename, "-folder___"))
                to_rename = g_slist_prepend (to_rename, g_strdup (filename));
        }

        g_dir_close (dir);

        g_slist_foreach (to_rename, em_rename_view_in_folder, views_dir);
        g_slist_free_full (to_rename, g_free);
    }

    g_free (views_dir);
}

gboolean
e_mail_migrate (EShellBackend *shell_backend,
                gint major,
                gint minor,
                gint micro,
                GError **error)
{
    const gchar *data_dir;

    data_dir = e_shell_backend_get_data_dir (shell_backend);

    if (major == 0)
        return emm_setup_initial (data_dir);

    if (major <= 2 || (major == 3 && minor < 4))
        em_rename_folder_views (shell_backend);

    return TRUE;
}