util-vserver-0.30.208

[util-vserver.git] / vserver-start / mount.c

diff --git a/vserver-start/mount.c b/vserver-start/mount.c
new file mode 100644 (file)
index 0000000..6f80f48
--- /dev/null
+++ b/vserver-start/mount.c
@@ -0,0 +1,184 @@
+// $Id: mount.c,v 1.2 2004/08/25 00:11:50 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2004 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// 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; version 2 of the License.
+//  
+// 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.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "mount.h"
+#include "configuration.h"
+#include "undo.h"
+
+#include <pathconfig.h>
+
+#include <lib/internal.h>
+#include <lib_internal/command.h>
+
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <wait.h>
+#include <string.h>
+
+#define ENSC_WRAPPERS_UNISTD   1
+#define ENSC_WRAPPERS_FCNTL    1
+#include <ensc_wrappers/wrappers.h>
+
+static char const *
+findMtab(char const *vserver_mtab)
+{
+  char const *tmp;
+  
+  if (utilvserver_isFile(vserver_mtab, true)) return vserver_mtab;
+
+  tmp=CONFDIR "/.defaults/init/mtab";
+  if (utilvserver_isFile(tmp, true)) return tmp;
+
+  tmp=PKGLIBDEFAULTDIR "/mtab";
+  if (utilvserver_isFile(tmp, true)) return tmp;
+
+  return 0;
+}
+
+static void
+initMtab(struct Configuration const *cfg)
+{
+  ENSC_PI_DECLARE(mtab_subpath,  "apps/init/mtab");
+  PathInfo             mtab_path  = cfg->cfgdir;
+  char                 mtab_buf[ENSC_PI_APPSZ(mtab_path, mtab_subpath)];
+
+  PathInfo_append(&mtab_path,  &mtab_subpath,  mtab_buf);
+  char const *         mtab = findMtab(mtab_path.d);
+  pid_t                        pid;
+  int                  p[2];
+
+  Epipe(p);
+  pid = Efork();
+  if (pid==0) {
+    Undo_detach();
+    Eclose(p[1]);
+    
+    Echdir(cfg->vdir);
+    Echroot(".");
+
+    int                fd = Eopen("/etc/mtab", O_WRONLY|O_CREAT, 0644);
+    for (;;) {
+      char     buf[4096];
+      ssize_t  len = TEMP_FAILURE_RETRY(read(p[0], buf, sizeof buf));
+      if (len==0) break;
+      if (len==-1) {
+       perror("vserver-start: initMtab/read():");
+       _exit(1);
+      }
+
+      Ewrite(fd, buf, len);
+    }
+    Eclose(fd);
+    Eclose(p[0]);
+    _exit(0);
+  }
+  else {
+    Eclose(p[0]);
+
+    if (mtab!=0) {
+      int              fd = Eopen(mtab, O_RDONLY, 0644);
+
+      for (;;) {
+       char    buf[4096];
+       ssize_t len = TEMP_FAILURE_RETRY(read(fd, buf, sizeof buf));
+       if (len==0) break;
+      if (len==-1) {
+       perror("vserver-start: initMtab/read():");
+       _exit(1);
+      }
+
+       Ewrite(p[1], buf, len);
+      }
+
+      Eclose(fd);
+    }
+
+    Eclose(p[1]);
+
+    int                status;
+    TEMP_FAILURE_RETRY(wait4(pid, &status, 0,0));
+
+    if (!WIFEXITED(status) || WEXITSTATUS(status)!=0) {
+      exit(1);
+    }
+  }
+}
+
+static void
+mountVserverInternal(struct Configuration const *cfg,
+                    PathInfo const *path, bool use_chbind)
+{
+  if (!utilvserver_isFile(path->d,true)) return;
+
+  pid_t                pid = Efork();
+  if (pid==0) {
+    Undo_detach();
+
+    Echdir(cfg->vdir);
+
+    if (use_chbind) {
+       // TODO
+    }
+
+    struct Command     cmd;
+    char const *       argv[] = {
+      PROG_SECURE_MOUNT,
+      "-a",
+      "--chroot",
+      "--fstab", path->d,
+      0
+    };
+
+    Command_init(&cmd);
+    Command_setParams(&cmd, argv);
+    Command_exec(&cmd, false);
+  }
+  else {
+    int                status;
+    TEMP_FAILURE_RETRY(wait4(pid, &status, 0,0));
+
+    if (!WIFEXITED(status) || WEXITSTATUS(status)!=0)
+      exit(1);
+  }
+}
+
+void
+mountVserver(struct Configuration const *cfg)
+{
+  ENSC_PI_DECLARE(fstab_subpath,  "fstab");
+  ENSC_PI_DECLARE(fstabl_subpath, "fstab.local");
+
+  PathInfo     fstab_path  = cfg->cfgdir;
+  char         fstab_buf[ENSC_PI_APPSZ(fstab_path, fstab_subpath)];
+
+  PathInfo     fstabl_path = cfg->cfgdir;
+  char         fstabl_buf[ENSC_PI_APPSZ(fstabl_path, fstabl_subpath)];
+
+  
+  PathInfo_append(&fstab_path,  &fstab_subpath,  fstab_buf);
+  PathInfo_append(&fstabl_path, &fstabl_subpath, fstabl_buf);
+  initMtab(cfg);
+
+  mountVserverInternal(cfg, &fstab_path,  true);
+  mountVserverInternal(cfg, &fstabl_path, false);
+}