506 lines
12 KiB
C++
506 lines
12 KiB
C++
/* mount.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005,
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2008 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include <stdio.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <mntent.h>
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#include <windows.h>
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#include <sys/cygwin.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <dirent.h>
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#ifdef errno
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#undef errno
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#endif
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#include <errno.h>
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#define NT_MAX_PATH 32768
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#define EXEC_FLAGS (MOUNT_EXEC | MOUNT_NOTEXEC | MOUNT_CYGWIN_EXEC)
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static void mount_entries (void);
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static void show_mounts (void);
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static void show_cygdrive_info (void);
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static void change_cygdrive_prefix (const char *new_prefix, int flags);
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static int mount_already_exists (const char *posix_path, int flags);
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// static short create_missing_dirs = FALSE;
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static short force = FALSE;
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static const char version[] = "$Revision$";
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static const char *progname;
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static void
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error (const char *path)
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{
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fprintf (stderr, "%s: %s: %s\n", progname, path,
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(errno == EMFILE) ? "Too many mount entries" : strerror (errno));
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exit (1);
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}
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/* FIXME: do_mount should also print a warning message if the dev arg
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is a non-existent Win32 path. */
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static void
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do_mount (const char *dev, const char *where, int flags)
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{
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struct stat statbuf;
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int statres;
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statres = stat (where, &statbuf);
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#if 0
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if (statres == -1)
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{
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/* FIXME: this'll fail if mount dir is missing any parent dirs */
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if (create_missing_dirs == TRUE)
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{
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if (mkdir (where, 0755) == -1)
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fprintf (stderr, "Warning: unable to create %s!\n", where);
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else
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statres = 0; /* Pretend stat succeeded if we could mkdir. */
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}
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}
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#endif
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if (statres == -1)
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{
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if (!force)
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fprintf (stderr, "%s: warning - %s does not exist.\n", progname, where);
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}
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else if (!(statbuf.st_mode & S_IFDIR))
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{
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if (!force)
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fprintf (stderr, "%s: warning: %s is not a directory.\n", progname, where);
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}
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if (!force && !(flags & EXEC_FLAGS) && strlen (dev))
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{
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char devtmp[1 + 2 * strlen (dev)];
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strcpy (devtmp, dev);
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char c = strchr (devtmp, '\0')[-1];
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if (c == '/' || c == '\\')
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strcat (devtmp, ".");
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/* Use a curious property of Windows which allows the use of \.. even
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on non-directory paths. */
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for (const char *p = dev; (p = strpbrk (p, "/\\")); p++)
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strcat (devtmp, "\\..");
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strcat (devtmp, "\\");
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if (GetDriveType (devtmp) == DRIVE_REMOTE)
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{
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fprintf (stderr, "%s: defaulting to '--no-executable' flag for speed since native path\n"
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"%*creferences a remote share. Use '-f' option to override.\n", progname,
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strlen(progname) + 2, ' ');
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flags |= MOUNT_NOTEXEC;
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}
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}
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if (mount (dev, where, flags))
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error (where);
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exit (0);
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}
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static struct option longopts[] =
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{
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{"change-cygdrive-prefix", no_argument, NULL, 'c'},
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{"force", no_argument, NULL, 'f'},
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{"help", no_argument, NULL, 'h' },
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{"mount-entries", no_argument, NULL, 'm'},
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{"options", required_argument, NULL, 'o'},
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{"show-cygdrive-prefix", no_argument, NULL, 'p'},
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{"version", no_argument, NULL, 'v'},
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{NULL, 0, NULL, 0}
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};
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static char opts[] = "cfhmpvo:";
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struct opt
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{
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const char *name;
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unsigned val;
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bool clear;
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} oopts[] =
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{
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{"binary", MOUNT_BINARY, false},
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{"text", MOUNT_BINARY, true},
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{"exec", MOUNT_EXEC, false},
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{"notexec", MOUNT_NOTEXEC, false},
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{"cygexec", MOUNT_CYGWIN_EXEC, false},
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{"nosuid", 0, 0},
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{"acl", MOUNT_NOACL, true},
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{"noacl", MOUNT_NOACL, false},
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{"posix=1", MOUNT_NOPOSIX, true},
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{"posix=0", MOUNT_NOPOSIX, false},
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};
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static void
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usage (FILE *where = stderr)
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{
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fprintf (where, "Usage: %s [OPTION] [<win32path> <posixpath>]\n\
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Display information about mounted filesystems, or mount a filesystem\n\
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\n\
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-c, --change-cygdrive-prefix change the cygdrive path prefix to <posixpath>\n\
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-f, --force force mount, don't warn about missing mount\n\
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point directories\n\
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-h, --help output usage information and exit\n\
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-m, --mount-entries write fstab entries to replicate mount points\n\
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and cygdrive prefixes\n\
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-o, --options X[,X...] specify mount options\n\
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-p, --show-cygdrive-prefix show user and/or system cygdrive path prefix\n\
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-v, --version output version information and exit\n\
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\n\
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Valid options are:\n\n ", progname);
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for (opt *o = oopts; o < (oopts + (sizeof (oopts) / sizeof (oopts[0]))); o++)
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fprintf (where, "%s%s", o == oopts ? "" : ",", o->name);
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fputs ("\n\n", where);
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exit (where == stderr ? 1 : 0);
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}
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static void
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print_version ()
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{
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const char *v = strchr (version, ':');
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int len;
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if (!v)
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{
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v = "?";
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len = 1;
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}
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else
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{
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v += 2;
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len = strchr (v, ' ') - v;
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}
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printf ("\
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%s (cygwin) %.*s\n\
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Filesystem Utility\n\
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Copyright 1996-2008 Red Hat, Inc.\n\
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Compiled on %s\n\
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", progname, len, v, __DATE__);
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}
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static char *
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concat3 (char *a, const char *b, const char *c)
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{
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size_t totlen = strlen (a) + strlen (b) + strlen (c) + 1;
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a = (char *) realloc (a, totlen);
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return strcat (strcat (a, b), c);
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}
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int
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main (int argc, char **argv)
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{
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int i;
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int flags = MOUNT_BINARY;
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char *options = strdup ("");
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enum do_what
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{
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nada,
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saw_change_cygdrive_prefix,
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saw_show_cygdrive_prefix,
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saw_mount_commands
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} do_what = nada;
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progname = strrchr (argv[0], '/');
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if (progname == NULL)
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progname = strrchr (argv[0], '\\');
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if (progname == NULL)
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progname = argv[0];
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else
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progname++;
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if (argc == 1)
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{
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show_mounts ();
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exit (0);
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}
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while ((i = getopt_long (argc, argv, opts, longopts, NULL)) != EOF)
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switch (i)
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{
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case 'c':
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if (do_what == nada)
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do_what = saw_change_cygdrive_prefix;
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else
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usage ();
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break;
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case 'f':
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force = TRUE;
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break;
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case 'h':
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usage (stdout);
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break;
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case 'm':
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if (do_what == nada)
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do_what = saw_mount_commands;
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else
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usage ();
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break;
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case 'o':
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if (*options)
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options = concat3 (options, ",", optarg);
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else
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options = strdup (optarg);
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break;
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case 'p':
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if (do_what == nada)
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do_what = saw_show_cygdrive_prefix;
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else
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usage ();
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break;
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case 'v':
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print_version ();
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return 0;
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break;
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default:
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usage ();
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}
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while (*options)
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{
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char *p = strchr (options, ',');
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if (p)
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*p++ = '\0';
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else
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p = strchr (options, '\0');
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for (opt *o = oopts; o < (oopts + (sizeof (oopts) / sizeof (oopts[0]))); o++)
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if (strcmp (options, o->name) == 0)
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{
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if (o->clear)
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flags &= ~o->val;
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else
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flags |= o->val;
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goto gotit;
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}
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fprintf (stderr, "%s: invalid option - '%s'\n", progname, options);
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exit (1);
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gotit:
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options = p;
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}
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if (flags & MOUNT_NOTEXEC && flags & (MOUNT_EXEC | MOUNT_CYGWIN_EXEC))
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{
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fprintf (stderr, "%s: invalid combination of executable options\n", progname);
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exit (1);
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}
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cygwin_internal (CW_SET_DOS_FILE_WARNING, false);
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argc--;
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switch (do_what)
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{
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case saw_change_cygdrive_prefix:
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if (optind != argc)
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usage ();
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change_cygdrive_prefix (argv[optind], flags);
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break;
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case saw_show_cygdrive_prefix:
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if (optind <= argc)
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usage ();
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show_cygdrive_info ();
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break;
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case saw_mount_commands:
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if (optind <= argc)
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usage ();
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mount_entries ();
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break;
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default:
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if (optind != (argc - 1))
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{
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if (optind >= argc)
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fprintf (stderr, "%s: not enough arguments\n", progname);
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else
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fprintf (stderr, "%s: too many arguments\n", progname);
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usage ();
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}
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if (force || !mount_already_exists (argv[optind + 1], flags))
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do_mount (argv[optind], argv[optind + 1], flags);
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else
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{
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errno = EBUSY;
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error (argv[optind + 1]);
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}
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}
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/* NOTREACHED */
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return 0;
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}
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static char *
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convert_spaces (char *tgt, const char *src)
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{
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char *tp, *spacep;
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const char *sp;
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tp = tgt;
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for (sp = src; (spacep = strchr (sp, ' ')); sp = spacep + 1)
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{
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tp = stpncpy (tp, sp, spacep - sp);
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tp = stpcpy (tp, "\\040");
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}
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stpcpy (tp, sp);
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return tgt;
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}
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static void
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mount_entries (void)
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{
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FILE *m = setmntent ("/-not-used-", "r");
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struct mntent *p;
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const char *format_mnt = "%s %s %s %s 0 0\n";
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const char *format_cyg = "none %s cygdrive %s 0 0\n";
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// write fstab entries for normal mount points
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while ((p = getmntent (m)) != NULL)
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// Only list non-cygdrives
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if (!strstr (p->mnt_opts, ",noumount"))
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{
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char fsname[NT_MAX_PATH], dirname[NT_MAX_PATH];
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printf (format_mnt, convert_spaces (fsname, p->mnt_fsname),
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convert_spaces (dirname, p->mnt_dir),
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p->mnt_type, p->mnt_opts);
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}
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endmntent (m);
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// write fstab entry for cygdrive prefix
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m = setmntent ("/-not-used-", "r");
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while ((p = getmntent (m)) != NULL)
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{
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char *noumount;
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if ((noumount = strstr (p->mnt_opts, ",noumount")))
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{
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char dirname[NT_MAX_PATH];
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char opts[strlen (p->mnt_opts) + 1];
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convert_spaces (dirname, p->mnt_dir);
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// remove trailing slash
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char *ls = strrchr (dirname, '/');
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if (ls)
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{
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// last slash == leading slash? cygdrive prefix == "/"
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if (ls == dirname)
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++ls;
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*ls = '\0';
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}
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*stpncpy (opts, p->mnt_opts, noumount - p->mnt_opts) = '\0';
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printf (format_cyg, dirname, opts);
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break;
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}
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}
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endmntent (m);
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exit(0);
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}
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static void
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show_mounts (void)
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{
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FILE *m = setmntent ("/-not-used-", "r");
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struct mntent *p;
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const char *format = "%s on %s type %s (%s)\n";
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// printf (format, "Device", "Directory", "Type", "Flags");
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while ((p = getmntent (m)) != NULL)
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printf (format, p->mnt_fsname, p->mnt_dir, p->mnt_type, p->mnt_opts);
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endmntent (m);
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}
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/* Return 1 if mountpoint from the same registry area is already in
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mount table. Otherwise return 0. */
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static int
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mount_already_exists (const char *posix_path, int flags)
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{
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int found_matching = 0;
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FILE *m = setmntent ("/-not-used-", "r");
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struct mntent *p;
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while ((p = getmntent (m)) != NULL)
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{
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/* if the paths match, and they're both the same type of mount. */
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if (strcmp (p->mnt_dir, posix_path) == 0)
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{
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if (p->mnt_type[0] == 'u')
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{
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if (!(flags & MOUNT_SYSTEM)) /* both current_user */
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found_matching = 1;
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else
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fprintf (stderr,
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"%s: warning: system mount point of '%s' "
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"will always be masked by user mount.\n",
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progname, posix_path);
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break;
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}
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else if (p->mnt_type[0] == 's')
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{
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if (flags & MOUNT_SYSTEM) /* both system */
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found_matching = 1;
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else
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fprintf (stderr,
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"%s: warning: user mount point of '%s' "
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"masks system mount.\n",
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progname, posix_path);
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break;
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}
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else
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{
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fprintf (stderr, "%s: warning: couldn't determine mount type.\n", progname);
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break;
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}
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}
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}
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endmntent (m);
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return found_matching;
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}
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/* change_cygdrive_prefix: Change the cygdrive prefix */
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static void
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change_cygdrive_prefix (const char *new_prefix, int flags)
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{
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flags |= MOUNT_CYGDRIVE;
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if (mount (NULL, new_prefix, flags))
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error (new_prefix);
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exit (0);
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}
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/* show_cygdrive_info: Show the user and/or cygdrive info, i.e., prefix and
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flags.*/
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static void
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show_cygdrive_info ()
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{
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/* Get the cygdrive info */
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char user[MAX_PATH];
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char system[MAX_PATH];
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char user_flags[MAX_PATH];
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char system_flags[MAX_PATH];
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cygwin_internal (CW_GET_CYGDRIVE_INFO, user, system, user_flags,
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system_flags);
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/* Display the user and system cygdrive path prefix, if necessary
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(ie, not empty) */
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const char *format = "%-18s %-11s %s\n";
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printf (format, "Prefix", "Type", "Flags");
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if (strlen (user) > 0)
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printf (format, user, "user", user_flags);
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if (strlen (system) > 0)
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printf (format, system, "nouser", system_flags);
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exit (0);
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}
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