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
  36
  37 /* Config: */
  38 #define DEFAULT_TRANSFER_BUFFER_SIZE (0x10000)
  39
  40
  41 GQuark cmdline_cmd_get_error_quark(void)
  42 {
  43 GQuark r=0;
  44
  45         if (!r)
  46                 r=g_quark_from_static_string("cmdline-cmd-get");
  47
  48         return r;
  49 }
  50
  51
  52 static gchar *optarg_transfer_buffer;
  53
  54 const struct poptOption cmd_get_table[]={
  55                 CMDLINE_POPT("buffer-size",'b',POPT_ARG_STRING,&optarg_transfer_buffer,
  56                                 N_("Transfer buffer size"),N_("size")),
  57                 CMDLINE_POPT_AUTOHELP
  58                 POPT_TABLEEND
  59                 };
  60
  61
  62 void cmd_get(const char **cmd_argv,GError **errp)
  63 {
  64 CaptiveFileObject *captive_file_object;
  65 const gchar *sourcefile,*targetfile;
  66 guint perm=0644;
  67 int fdtgt;
  68 guint8 *transfer_buffer;
  69 long transfer_buffer_size=DEFAULT_TRANSFER_BUFFER_SIZE;
  70
  71         g_return_if_fail(!errp || !*errp);
  72
  73         if (optarg_transfer_buffer) {
  74 const gchar *string=captive_strdup_alloca(optarg_transfer_buffer);
  75 char *endptr;
  76
  77                 free(optarg_transfer_buffer);
  78                 optarg_transfer_buffer=NULL;
  79
  80                 transfer_buffer_size=strtol(string,&endptr,0);
  81                 if (transfer_buffer_size<=0 || transfer_buffer_size>=LONG_MAX || (endptr && *endptr)) {
  82                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_PARSING_TRANSFER_BUFFER_SIZE,
  83                                         _("Error parsing transfer buffer size: %s"),string);
  84                         return;
  85                         }
  86                 }
  87
  88         sourcefile=cmdline_path_from_cwd(cmd_argv[0]);
  89         if (cmd_argv[1])
  90                 targetfile=captive_strdup_alloca(cmdline_path_from_cwd(cmd_argv[1]));
  91         else {
  92 char *s;
  93
  94                 targetfile=captive_strdup_alloca(sourcefile);
  95                 if ((s=strrchr(targetfile,G_DIR_SEPARATOR)))
  96                         targetfile=s+1;
  97                 }
  98
  99         if (-1==(fdtgt=open(targetfile,
 100                         O_CREAT|O_EXCL|O_WRONLY /* flags */
 101 #ifdef O_BINARY
 102                                         | O_BINARY
 103 #endif /* O_BINARY */
 104 #ifdef O_LARGEFILE
 105                                         | O_LARGEFILE
 106 #endif /* O_LARGEFILE */
 107                                         ,
 108                         perm))) {       /* mode */
 109                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_CANNOT_CREATE_TARGET_HOSTOS_FILE,
 110                                 _("Cannot create target host-os file '%s': %s"),targetfile,g_strerror(errno));
 111                 return;
 112                 }
 113
 114         if (!errvfsresult_to_gerr(errp,captive_file_new_open(
 115                         &captive_file_object,   /* captive_file_object_return */
 116                         cmdline_captive_vfs_object,     /* captive_vfs_object */
 117                         sourcefile,     /* pathname */
 118                         GNOME_VFS_OPEN_READ))) {        /* mode */
 119                 err_cleanup(errp);
 120                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_OPENING_SOURCE_FILE,
 121                                 _("Error opening source guest-os file: %s"),sourcefile);
 122                 goto err_close_fdtgt;
 123                 }
 124
 125         transfer_buffer=g_malloc(transfer_buffer_size);
 126         g_assert(transfer_buffer!=NULL);        /* Should not happen. */
 127
 128         for (;;) {
 129 GnomeVFSFileSize bytes_read;
 130 GnomeVFSResult errvfsresult;
 131 ssize_t gotssize;
 132
 133                 errvfsresult=captive_file_read(
 134                                 captive_file_object,    /* captive_file_object */
 135                                 transfer_buffer,        /* buffer */
 136                                 transfer_buffer_size,   /* num_bytes */
 137                                 &bytes_read);   /* bytes_read_return */
 138                 g_assert(errvfsresult==GNOME_VFS_OK || errvfsresult==GNOME_VFS_ERROR_EOF);
 139                 g_assert((errvfsresult==GNOME_VFS_ERROR_EOF)==(bytes_read==0));
 140                 if (errvfsresult==GNOME_VFS_ERROR_EOF)
 141                         break;
 142                 if (errvfsresult!=GNOME_VFS_OK) {
 143 gboolean errbool;
 144
 145                         errbool=errvfsresult_to_gerr(errp,errvfsresult);
 146                         g_assert(errbool==FALSE);
 147                         err_cleanup(errp);
 148                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_READING_SOURCE_FILE,
 149                                         _("Error reading source guest-os file '%s': %s"),sourcefile,g_strerror(errno));
 150                         goto err_free_transfer_buffer;
 151                         }
 152
 153                 if (bytes_read!=(GnomeVFSFileSize)(gotssize=write(fdtgt,transfer_buffer,bytes_read))) {
 154                         g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_WRITING_TARGET_HOSTOS_FILE,
 155                                         _("Error writing target host-os file: %s"),targetfile);
 156                         goto err_free_transfer_buffer;
 157                         }
 158                 }
 159
 160 err_free_transfer_buffer:
 161         g_free(transfer_buffer);
 162 /* err_unref_captive_file_object: */
 163         g_object_unref(captive_file_object);
 164 err_close_fdtgt:
 165         if (close(fdtgt)) {
 166                 err_cleanup(errp);      /* may be clean */
 167                 g_set_error(errp,CMDLINE_CMD_GET_ERROR,CMDLINE_CMD_GET_ERROR_CLOSING_TARGET_HOSTOS_FILE,
 168                                 _("Error closing target host-os file '%s': %s"),targetfile,g_strerror(errno));
 169                 }
 170 }