src/client/cmdline/cmd_get.c

   1 /* $Id$
   2  * client cmdline interface command "get" for libcaptive
   3  * Copyright (C) 2003 Jan Kratochvil <project-captive@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include <glib/gmessages.h>
  23 #include <glib/gerror.h>
  24 #include <popt.h>
  25 #include <captive/client-file.h>
  26 #include <fcntl.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <captive/macros.h>
  30 #include <stdlib.h>
  31
  32 #include "cmd_get.h"    /* self */
  33 #include "cmd_cd.h"     /* for cmdline_path_from_cwd() */
  34 #include "main.h"
  35 #include "utf8.h"
  36
  37
  38 /* Config: */
  39 #define DEFAULT_TRANSFER_BUFFER_SIZE (0x10000)
  40
  41
  42 GQuark cmdline_cmd_get_error_quark(void)
  43 {
  44 GQuark r=0;
  45
  46         if (!r)
  47                 r=g_quark_from_static_string("cmdline-cmd-get");
  48
  49         return r;
  50 }
  51
  52
  53 static gchar *optarg_transfer_buffer;
  54
  55 const struct poptOption cmd_get_table[]={
  56                 CMDLINE_POPT("buffer-size",'b',POPT_ARG_STRING,&optarg_transfer_buffer,
  57                                 N_("Transfer buffer size"),N_("size")),
  58                 CMDLINE_POPT_AUTOHELP
  59                 POPT_TABLEEND
  60                 };
  61
  62
  63 void cmd_get(const char **cmd_argv,GError **errp)
  64 {
  65 CaptiveFileObject *captive_file_object;
  66 const gchar *sourcefile,*targetfile;
  67 guint perm=0644;
  68 int fdtgt;
  69 guint8 *transfer_buffer;
  70 long transfer_buffer_size=DEFAULT_TRANSFER_BUFFER_SIZE;
  71
  72         g_return_if_fail(!errp || !*errp);
  73
  74         if (optarg_transfer_buffer) {
  75 const gchar *string=captive_strdup_alloca(optarg_transfer_buffer);
  76 char *endptr;
  77
  78                 free(optarg_transfer_buffer);
  79                 optarg_transfer_buffer=NULL;
  80
  81                 transfer_buffer_size=strtol(string,&endptr,0);
  82                 if (transfer_buffer_size<=0 || transfer_buffer_size>=LONG_MAX || (endptr && *endptr)) {
  83                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_PARSING_TRANSFER_BUFFER_SIZE,
  84                                         _("Error parsing transfer buffer size: %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(string));
  85                         return;
  86                         }
  87                 }
  88
  89         sourcefile=cmdline_path_from_cwd(cmd_argv[0]);
  90         if (cmd_argv[1])
  91                 targetfile=captive_strdup_alloca(cmdline_path_from_cwd(cmd_argv[1]));
  92         else {
  93 char *s;
  94
  95                 targetfile=captive_strdup_alloca(sourcefile);
  96                 if ((s=strrchr(targetfile,G_DIR_SEPARATOR)))
  97                         targetfile=s+1;
  98                 }
  99
 100         if (-1==(fdtgt=open(CMD_FILENAME_FROM_UTF8_ALLOCA(targetfile),
 101                         O_CREAT|O_EXCL|O_WRONLY /* flags */
 102 #ifdef O_BINARY
 103                                         | O_BINARY
 104 #endif /* O_BINARY */
 105 #ifdef O_LARGEFILE
 106                                         | O_LARGEFILE
 107 #endif /* O_LARGEFILE */
 108                                         ,
 109                         perm))) {       /* mode */
 110                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_CANNOT_CREATE_TARGET_HOSTOS_FILE,
 111                                 _("Cannot create target host-os file '%s': %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(targetfile),g_strerror(errno));
 112                 return;
 113                 }
 114
 115         if (!errvfsresult_to_gerr(errp,captive_file_new_open(
 116                         &captive_file_object,   /* captive_file_object_return */
 117                         cmdline_captive_vfs_object,     /* captive_vfs_object */
 118                         sourcefile,     /* pathname */
 119                         GNOME_VFS_OPEN_READ))) {        /* mode */
 120                 err_cleanup(errp);
 121                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_OPENING_SOURCE_FILE,
 122                                 _("Error opening source guest-os file: %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(sourcefile));
 123                 goto err_close_fdtgt;
 124                 }
 125
 126         transfer_buffer=g_malloc(transfer_buffer_size);
 127         g_assert(transfer_buffer!=NULL);        /* Should not happen. */
 128
 129         for (;;) {
 130 GnomeVFSFileSize bytes_read;
 131 GnomeVFSResult errvfsresult;
 132 ssize_t gotssize;
 133
 134                 errvfsresult=captive_file_read(
 135                                 captive_file_object,    /* captive_file_object */
 136                                 transfer_buffer,        /* buffer */
 137                                 transfer_buffer_size,   /* num_bytes */
 138                                 &bytes_read);   /* bytes_read_return */
 139                 g_assert(errvfsresult==GNOME_VFS_OK || errvfsresult==GNOME_VFS_ERROR_EOF);
 140                 g_assert((errvfsresult==GNOME_VFS_ERROR_EOF)==(bytes_read==0));
 141                 if (errvfsresult==GNOME_VFS_ERROR_EOF)
 142                         break;
 143                 if (errvfsresult!=GNOME_VFS_OK) {
 144 gboolean errbool;
 145
 146                         errbool=errvfsresult_to_gerr(errp,errvfsresult);
 147                         g_assert(errbool==FALSE);
 148                         err_cleanup(errp);
 149                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_READING_SOURCE_FILE,
 150                                         _("Error reading source guest-os file '%s': %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(sourcefile),g_strerror(errno));
 151                         goto err_free_transfer_buffer;
 152                         }
 153
 154                 if (bytes_read!=(GnomeVFSFileSize)(gotssize=write(fdtgt,transfer_buffer,bytes_read))) {
 155                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_WRITING_TARGET_HOSTOS_FILE,
 156                                         _("Error writing target host-os file: %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(targetfile));
 157                         goto err_free_transfer_buffer;
 158                         }
 159                 }
 160
 161 err_free_transfer_buffer:
 162         g_free(transfer_buffer);
 163 /* err_unref_captive_file_object: */
 164         g_object_unref(captive_file_object);
 165 err_close_fdtgt:
 166         if (close(fdtgt)) {
 167                 err_cleanup(errp);      /* may be clean */
 168                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_CLOSING_TARGET_HOSTOS_FILE,
 169                                 _("Error closing target host-os file '%s': %s"),CMD_LOCALE_FROM_UTF8_ALLOCA(targetfile),g_strerror(errno));
 170                 }
 171 }