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-rw-r--r--fuse/guestmount.c1163
1 files changed, 1163 insertions, 0 deletions
diff --git a/fuse/guestmount.c b/fuse/guestmount.c
new file mode 100644
index 00000000..ec3cc773
--- /dev/null
+++ b/fuse/guestmount.c
@@ -0,0 +1,1163 @@
+/* guestmount - mount guests using libguestfs and FUSE
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Derived from the example program 'fusexmp.c':
+ * Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
+ *
+ * This program can be distributed under the terms of the GNU GPL.
+ * See the file COPYING.
+ */
+
+#define FUSE_USE_VERSION 26
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <errno.h>
+#include <signal.h>
+#include <time.h>
+#include <assert.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <fuse.h>
+#include <guestfs.h>
+
+#include "progname.h"
+
+#include "dircache.h"
+
+/* See <attr/xattr.h> */
+#ifndef ENOATTR
+#define ENOATTR ENODATA
+#endif
+
+#ifdef HAVE_GETTEXT
+#include "gettext.h"
+#define _(str) dgettext(PACKAGE, (str))
+//#define N_(str) dgettext(PACKAGE, (str))
+#else
+#define _(str) str
+//#define N_(str) str
+#endif
+
+static inline char *
+bad_cast (char const *s)
+{
+ return (char *) s;
+}
+
+static guestfs_h *g = NULL;
+static int read_only = 0;
+int verbose = 0;
+int dir_cache_timeout = 60;
+
+/* This is ugly: guestfs errors are strings, FUSE wants -errno. We
+ * have to do the conversion as best we can.
+ */
+#define MAX_ERRNO 256
+
+static int
+error (void)
+{
+ int i;
+ const char *err = guestfs_last_error (g);
+
+ if (!err)
+ return -EINVAL;
+
+ if (verbose)
+ fprintf (stderr, "%s\n", err);
+
+ /* Add a few of our own ... */
+
+ /* This indicates guestfsd died. Translate into a hard EIO error.
+ * Arguably we could relaunch the guest if we hit this error.
+ */
+ if (strstr (err, "call launch before using this function"))
+ return -EIO;
+
+ /* See if it matches an errno string in the host. */
+ for (i = 0; i < MAX_ERRNO; ++i) {
+ const char *e = strerror (i);
+ if (e && strstr (err, e) != NULL)
+ return -i;
+ }
+
+ /* Too bad, return a generic error. */
+ return -EINVAL;
+}
+
+static struct guestfs_xattr_list *
+copy_xattr_list (const struct guestfs_xattr *first, size_t num)
+{
+ struct guestfs_xattr_list *xattrs;
+
+ xattrs = malloc (sizeof *xattrs);
+ if (xattrs == NULL) {
+ perror ("malloc");
+ return NULL;
+ }
+
+ xattrs->len = num;
+ xattrs->val = malloc (num * sizeof (struct guestfs_xattr));
+ if (xattrs->val == NULL) {
+ perror ("malloc");
+ free (xattrs);
+ return NULL;
+ }
+
+ size_t i;
+ for (i = 0; i < num; ++i) {
+ xattrs->val[i].attrname = strdup (first[i].attrname);
+ xattrs->val[i].attrval_len = first[i].attrval_len;
+ xattrs->val[i].attrval = malloc (first[i].attrval_len);
+ memcpy (xattrs->val[i].attrval, first[i].attrval, first[i].attrval_len);
+ }
+
+ return xattrs;
+}
+
+static int
+fg_readdir (const char *path, void *buf, fuse_fill_dir_t filler,
+ off_t offset, struct fuse_file_info *fi)
+{
+ time_t now;
+ time (&now);
+
+ dir_cache_remove_all_expired (now);
+
+ struct guestfs_dirent_list *ents;
+
+ ents = guestfs_readdir (g, path);
+ if (ents == NULL)
+ return error ();
+
+ size_t i;
+ for (i = 0; i < ents->len; ++i) {
+ struct stat stat;
+ memset (&stat, 0, sizeof stat);
+
+ stat.st_ino = ents->val[i].ino;
+ switch (ents->val[i].ftyp) {
+ case 'b': stat.st_mode = S_IFBLK; break;
+ case 'c': stat.st_mode = S_IFCHR; break;
+ case 'd': stat.st_mode = S_IFDIR; break;
+ case 'f': stat.st_mode = S_IFIFO; break;
+ case 'l': stat.st_mode = S_IFLNK; break;
+ case 'r': stat.st_mode = S_IFREG; break;
+ case 's': stat.st_mode = S_IFSOCK; break;
+ case 'u':
+ case '?':
+ default: stat.st_mode = 0;
+ }
+
+ /* Copied from the example, which also ignores 'offset'. I'm
+ * not quite sure how this is ever supposed to work on large
+ * directories. XXX
+ */
+ if (filler (buf, ents->val[i].name, &stat, 0))
+ break;
+ }
+
+ /* Now prepopulate the directory caches. This step is just an
+ * optimization, don't worry if it fails.
+ */
+ char **names = malloc ((ents->len + 1) * sizeof (char *));
+ if (names) {
+ for (i = 0; i < ents->len; ++i)
+ names[i] = ents->val[i].name;
+ names[i] = NULL;
+
+ struct guestfs_stat_list *ss = guestfs_lstatlist (g, path, names);
+ if (ss) {
+ for (i = 0; i < ss->len; ++i) {
+ if (ss->val[i].ino >= 0) {
+ struct stat statbuf;
+
+ statbuf.st_dev = ss->val[i].dev;
+ statbuf.st_ino = ss->val[i].ino;
+ statbuf.st_mode = ss->val[i].mode;
+ statbuf.st_nlink = ss->val[i].nlink;
+ statbuf.st_uid = ss->val[i].uid;
+ statbuf.st_gid = ss->val[i].gid;
+ statbuf.st_rdev = ss->val[i].rdev;
+ statbuf.st_size = ss->val[i].size;
+ statbuf.st_blksize = ss->val[i].blksize;
+ statbuf.st_blocks = ss->val[i].blocks;
+ statbuf.st_atime = ss->val[i].atime;
+ statbuf.st_mtime = ss->val[i].mtime;
+ statbuf.st_ctime = ss->val[i].ctime;
+
+ lsc_insert (path, names[i], now, &statbuf);
+ }
+ }
+ guestfs_free_stat_list (ss);
+ }
+
+ struct guestfs_xattr_list *xattrs = guestfs_lxattrlist (g, path, names);
+ if (xattrs) {
+ size_t ni, num;
+ struct guestfs_xattr *first;
+ struct guestfs_xattr_list *copy;
+ for (i = 0, ni = 0; i < xattrs->len; ++i, ++ni) {
+ assert (strlen (xattrs->val[i].attrname) == 0);
+ if (xattrs->val[i].attrval_len > 0) {
+ ++i;
+ first = &xattrs->val[i];
+ num = 0;
+ for (; i < xattrs->len && strlen (xattrs->val[i].attrname) > 0; ++i)
+ num++;
+
+ copy = copy_xattr_list (first, num);
+ if (copy)
+ xac_insert (path, names[ni], now, copy);
+
+ i--;
+ }
+ }
+ guestfs_free_xattr_list (xattrs);
+ }
+
+ char **links = guestfs_readlinklist (g, path, names);
+ if (links) {
+ for (i = 0; names[i] != NULL; ++i) {
+ if (links[i][0])
+ /* Note that rlc_insert owns the string links[i] after this, */
+ rlc_insert (path, names[i], now, links[i]);
+ else
+ /* which is why we have to free links[i] here. */
+ free (links[i]);
+ }
+ free (links); /* free the array, not the strings */
+ }
+
+ free (names);
+ }
+
+ guestfs_free_dirent_list (ents);
+
+ return 0;
+}
+
+static int
+fg_getattr (const char *path, struct stat *statbuf)
+{
+ const struct stat *buf;
+
+ buf = lsc_lookup (path);
+ if (buf) {
+ memcpy (statbuf, buf, sizeof *statbuf);
+ return 0;
+ }
+
+ struct guestfs_stat *r;
+
+ r = guestfs_lstat (g, path);
+ if (r == NULL)
+ return error ();
+
+ statbuf->st_dev = r->dev;
+ statbuf->st_ino = r->ino;
+ statbuf->st_mode = r->mode;
+ statbuf->st_nlink = r->nlink;
+ statbuf->st_uid = r->uid;
+ statbuf->st_gid = r->gid;
+ statbuf->st_rdev = r->rdev;
+ statbuf->st_size = r->size;
+ statbuf->st_blksize = r->blksize;
+ statbuf->st_blocks = r->blocks;
+ statbuf->st_atime = r->atime;
+ statbuf->st_mtime = r->mtime;
+ statbuf->st_ctime = r->ctime;
+
+ guestfs_free_stat (r);
+
+ return 0;
+}
+
+/* Nautilus loves to use access(2) to test everything about a file,
+ * such as whether it's executable. Therefore treat this a lot like
+ * fg_getattr.
+ */
+static int
+fg_access (const char *path, int mask)
+{
+ struct stat statbuf;
+ int r;
+
+ if (read_only && (mask & W_OK))
+ return -EROFS;
+
+ r = fg_getattr (path, &statbuf);
+ if (r < 0 || mask == F_OK)
+ return r;
+
+ struct fuse_context *fuse = fuse_get_context ();
+ int ok = 1;
+
+ if (mask & R_OK)
+ ok = ok &&
+ ( fuse->uid == statbuf.st_uid ? statbuf.st_mode & S_IRUSR
+ : fuse->gid == statbuf.st_gid ? statbuf.st_mode & S_IRGRP
+ : statbuf.st_mode & S_IROTH);
+ if (mask & W_OK)
+ ok = ok &&
+ ( fuse->uid == statbuf.st_uid ? statbuf.st_mode & S_IWUSR
+ : fuse->gid == statbuf.st_gid ? statbuf.st_mode & S_IWGRP
+ : statbuf.st_mode & S_IWOTH);
+ if (mask & X_OK)
+ ok = ok &&
+ ( fuse->uid == statbuf.st_uid ? statbuf.st_mode & S_IXUSR
+ : fuse->gid == statbuf.st_gid ? statbuf.st_mode & S_IXGRP
+ : statbuf.st_mode & S_IXOTH);
+
+ return ok ? 0 : -EACCES;
+}
+
+static int
+fg_readlink (const char *path, char *buf, size_t size)
+{
+ const char *r;
+ int free_it = 0;
+
+ r = rlc_lookup (path);
+ if (!r) {
+ r = guestfs_readlink (g, path);
+ if (r == NULL)
+ return error ();
+ free_it = 1;
+ }
+
+ /* Note this is different from the real readlink(2) syscall. FUSE wants
+ * the string to be always nul-terminated, even if truncated.
+ */
+ size_t len = strlen (r);
+ if (len > size - 1)
+ len = size - 1;
+
+ memcpy (buf, r, len);
+ buf[len] = '\0';
+
+ if (free_it)
+ free ((char *) r);
+
+ return 0;
+}
+
+static int
+fg_mknod (const char *path, mode_t mode, dev_t rdev)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_mknod (g, mode, major (rdev), minor (rdev), path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_mkdir (const char *path, mode_t mode)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_mkdir_mode (g, path, mode);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_unlink (const char *path)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_rm (g, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_rmdir (const char *path)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_rmdir (g, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_symlink (const char *from, const char *to)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (to);
+
+ r = guestfs_ln_s (g, to, from);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_rename (const char *from, const char *to)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (to);
+
+ /* XXX It's not clear how close the 'mv' command is to the
+ * rename syscall. We might need to add the rename syscall
+ * to the guestfs(3) API.
+ */
+ r = guestfs_mv (g, from, to);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_link (const char *from, const char *to)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (to);
+
+ r = guestfs_ln (g, to, from);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_chmod (const char *path, mode_t mode)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_chmod (g, mode, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_chown (const char *path, uid_t uid, gid_t gid)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_lchown (g, uid, gid, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_truncate (const char *path, off_t size)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_truncate_size (g, path, size);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_utimens (const char *path, const struct timespec ts[2])
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ time_t atsecs = ts[0].tv_sec;
+ long atnsecs = ts[0].tv_nsec;
+ time_t mtsecs = ts[1].tv_sec;
+ long mtnsecs = ts[1].tv_nsec;
+
+ if (atnsecs == UTIME_NOW)
+ atnsecs = -1;
+ if (atnsecs == UTIME_OMIT)
+ atnsecs = -2;
+ if (mtnsecs == UTIME_NOW)
+ mtnsecs = -1;
+ if (mtnsecs == UTIME_OMIT)
+ mtnsecs = -2;
+
+ r = guestfs_utimens (g, path, atsecs, atnsecs, mtsecs, mtnsecs);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+/* This call is quite hard to emulate through the guestfs(3) API. In
+ * one sense it's a little like access (see above) because it tests
+ * whether opening a file would succeed given the flags. But it also
+ * has side effects such as truncating the file if O_TRUNC is given.
+ * Therefore we need to emulate it ... painfully.
+ */
+static int
+fg_open (const char *path, struct fuse_file_info *fi)
+{
+ int r, exists;
+
+ if (fi->flags & O_WRONLY) {
+ if (read_only)
+ return -EROFS;
+ }
+
+ exists = guestfs_exists (g, path);
+ if (exists == -1)
+ return error ();
+
+ if (fi->flags & O_CREAT) {
+ if (read_only)
+ return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ /* Exclusive? File must not exist already. */
+ if (fi->flags & O_EXCL) {
+ if (exists)
+ return -EEXIST;
+ }
+
+ /* Create? Touch it and optionally truncate it. */
+ r = guestfs_touch (g, path);
+ if (r == -1)
+ return error ();
+
+ if (fi->flags & O_TRUNC) {
+ r = guestfs_truncate (g, path);
+ if (r == -1)
+ return error ();
+ }
+ } else {
+ /* Not create, just check it exists. */
+ if (!exists)
+ return -ENOENT;
+ }
+
+ return 0;
+}
+
+static int
+fg_read (const char *path, char *buf, size_t size, off_t offset,
+ struct fuse_file_info *fi)
+{
+ char *r;
+ size_t rsize;
+
+ if (verbose)
+ fprintf (stderr, "fg_read: %s: size %zu offset %zu\n",
+ path, size, offset);
+
+ /* The guestfs protocol limits size to somewhere over 2MB. We just
+ * reduce the requested size here accordingly and push the problem
+ * up to every user. http://www.jwz.org/doc/worse-is-better.html
+ */
+ const size_t limit = 2 * 1024 * 1024;
+ if (size > limit)
+ size = limit;
+
+ r = guestfs_pread (g, path, size, offset, &rsize);
+ if (r == NULL)
+ return error ();
+
+ /* This should never happen, but at least it stops us overflowing
+ * the output buffer if it does happen.
+ */
+ if (rsize > size)
+ rsize = size;
+
+ memcpy (buf, r, rsize);
+ free (r);
+
+ return rsize;
+}
+
+static int
+fg_write (const char *path, const char *buf, size_t size,
+ off_t offset, struct fuse_file_info *fi)
+{
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ return -ENOSYS; /* XXX */
+}
+
+static int
+fg_statfs (const char *path, struct statvfs *stbuf)
+{
+ struct guestfs_statvfs *r;
+
+ r = guestfs_statvfs (g, path);
+ if (r == NULL)
+ return error ();
+
+ stbuf->f_bsize = r->bsize;
+ stbuf->f_frsize = r->frsize;
+ stbuf->f_blocks = r->blocks;
+ stbuf->f_bfree = r->bfree;
+ stbuf->f_bavail = r->bavail;
+ stbuf->f_files = r->files;
+ stbuf->f_ffree = r->ffree;
+ stbuf->f_favail = r->favail;
+ stbuf->f_fsid = r->fsid;
+ stbuf->f_flag = r->flag;
+ stbuf->f_namemax = r->namemax;
+
+ guestfs_free_statvfs (r);
+
+ return 0;
+}
+
+static int
+fg_release (const char *path, struct fuse_file_info *fi)
+{
+ /* Just a stub. This method is optional and can safely be left
+ * unimplemented.
+ */
+ return 0;
+}
+
+/* Emulate this by calling sync. */
+static int fg_fsync(const char *path, int isdatasync,
+ struct fuse_file_info *fi)
+{
+ int r;
+
+ r = guestfs_sync (g);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static int
+fg_setxattr (const char *path, const char *name, const char *value,
+ size_t size, int flags)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ /* XXX Underlying guestfs(3) API doesn't understand the flags. */
+ r = guestfs_lsetxattr (g, name, value, size, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+/* The guestfs(3) API for getting xattrs is much easier to use
+ * than the real syscall. Unfortunately we now have to emulate
+ * the real syscall using that API :-(
+ */
+static int
+fg_getxattr (const char *path, const char *name, char *value,
+ size_t size)
+{
+ const struct guestfs_xattr_list *xattrs;
+ int free_attrs = 0;
+
+ xattrs = xac_lookup (path);
+ if (xattrs == NULL) {
+ xattrs = guestfs_lgetxattrs (g, path);
+ if (xattrs == NULL)
+ return error ();
+ free_attrs = 1;
+ }
+
+ size_t i;
+ int r = -ENOATTR;
+ for (i = 0; i < xattrs->len; ++i) {
+ if (strcmp (xattrs->val[i].attrname, name) == 0) {
+ size_t sz = xattrs->val[i].attrval_len;
+ if (sz > size)
+ sz = size;
+ memcpy (value, xattrs->val[i].attrval, sz);
+ r = 0;
+ break;
+ }
+ }
+
+ if (free_attrs)
+ guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
+
+ return r;
+}
+
+/* Ditto as above. */
+static int
+fg_listxattr (const char *path, char *list, size_t size)
+{
+ const struct guestfs_xattr_list *xattrs;
+ int free_attrs = 0;
+
+ xattrs = xac_lookup (path);
+ if (xattrs == NULL) {
+ xattrs = guestfs_lgetxattrs (g, path);
+ if (xattrs == NULL)
+ return error ();
+ free_attrs = 1;
+ }
+
+ size_t i;
+ ssize_t copied = 0;
+ for (i = 0; i < xattrs->len; ++i) {
+ size_t len = strlen (xattrs->val[i].attrname) + 1;
+ if (size >= len) {
+ memcpy (list, xattrs->val[i].attrname, len);
+ size -= len;
+ list += len;
+ copied += len;
+ } else {
+ copied = -ERANGE;
+ break;
+ }
+ }
+
+ if (free_attrs)
+ guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
+
+ return copied;
+}
+
+static int
+fg_removexattr(const char *path, const char *name)
+{
+ int r;
+
+ if (read_only) return -EROFS;
+
+ dir_cache_invalidate (path);
+
+ r = guestfs_lremovexattr (g, name, path);
+ if (r == -1)
+ return error ();
+
+ return 0;
+}
+
+static struct fuse_operations fg_operations = {
+ .getattr = fg_getattr,
+ .access = fg_access,
+ .readlink = fg_readlink,
+ .readdir = fg_readdir,
+ .mknod = fg_mknod,
+ .mkdir = fg_mkdir,
+ .symlink = fg_symlink,
+ .unlink = fg_unlink,
+ .rmdir = fg_rmdir,
+ .rename = fg_rename,
+ .link = fg_link,
+ .chmod = fg_chmod,
+ .chown = fg_chown,
+ .truncate = fg_truncate,
+ .utimens = fg_utimens,
+ .open = fg_open,
+ .read = fg_read,
+ .write = fg_write,
+ .statfs = fg_statfs,
+ .release = fg_release,
+ .fsync = fg_fsync,
+ .setxattr = fg_setxattr,
+ .getxattr = fg_getxattr,
+ .listxattr = fg_listxattr,
+ .removexattr = fg_removexattr,
+};
+
+struct drv {
+ struct drv *next;
+ char *filename;
+};
+
+struct mp {
+ struct mp *next;
+ char *device;
+ char *mountpoint;
+};
+
+static void add_drives (struct drv *);
+static void mount_mps (struct mp *);
+
+static void __attribute__((noreturn))
+fuse_help (void)
+{
+ const char *tmp_argv[] = { program_name, "--help", NULL };
+ fuse_main (2, (char **) tmp_argv, &fg_operations, NULL);
+ exit (0);
+}
+
+static void __attribute__((noreturn))
+usage (int status)
+{
+ if (status != EXIT_SUCCESS)
+ fprintf (stderr, _("Try `%s --help' for more information.\n"),
+ program_name);
+ else {
+ fprintf (stdout,
+ _("%s: FUSE module for libguestfs\n"
+ "%s lets you mount a virtual machine filesystem\n"
+ "Copyright (C) 2009 Red Hat Inc.\n"
+ "Usage:\n"
+ " %s [--options] [-- [--FUSE-options]] mountpoint\n"
+ "Options:\n"
+ " -a|--add image Add image\n"
+ " --dir-cache-timeout Set readdir cache timeout (default 5 sec)\n"
+ " --fuse-help Display extra FUSE options\n"
+ " --help Display help message and exit\n"
+ " -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
+ " -n|--no-sync Don't autosync\n"
+ " -o|--option opt Pass extra option to FUSE\n"
+ " -r|--ro Mount read-only\n"
+ " --selinux Enable SELinux support\n"
+ " --trace Trace guestfs API calls (to stderr)\n"
+ " -v|--verbose Verbose messages\n"
+ " -V|--version Display version and exit\n"
+ ),
+ program_name, program_name, program_name);
+ }
+ exit (status);
+}
+
+int
+main (int argc, char *argv[])
+{
+ enum { HELP_OPTION = CHAR_MAX + 1 };
+
+ /* The command line arguments are broadly compatible with (a subset
+ * of) guestfish. Thus we have to deal mainly with -a, -m and --ro.
+ */
+ static const char *options = "a:m:no:rv?V";
+ static const struct option long_options[] = {
+ { "add", 1, 0, 'a' },
+ { "dir-cache-timeout", 1, 0, 0 },
+ { "fuse-help", 0, 0, 0 },
+ { "help", 0, 0, HELP_OPTION },
+ { "mount", 1, 0, 'm' },
+ { "no-sync", 0, 0, 'n' },
+ { "option", 1, 0, 'o' },
+ { "ro", 0, 0, 'r' },
+ { "selinux", 0, 0, 0 },
+ { "trace", 0, 0, 0 },
+ { "verbose", 0, 0, 'v' },
+ { "version", 0, 0, 'V' },
+ { 0, 0, 0, 0 }
+ };
+
+ struct drv *drvs = NULL;
+ struct drv *drv;
+ struct mp *mps = NULL;
+ struct mp *mp;
+ char *p;
+ int c, i, r;
+ int option_index;
+ struct sigaction sa;
+
+ int fuse_argc = 0;
+ const char **fuse_argv = NULL;
+
+#define ADD_FUSE_ARG(str) \
+ do { \
+ fuse_argc ++; \
+ fuse_argv = realloc (fuse_argv, (1+fuse_argc) * sizeof (char *)); \
+ if (!fuse_argv) { \
+ perror ("realloc"); \
+ exit (1); \
+ } \
+ fuse_argv[fuse_argc-1] = (str); \
+ fuse_argv[fuse_argc] = NULL; \
+ } while (0)
+
+ /* LC_ALL=C is required so we can parse error messages. */
+ setenv ("LC_ALL", "C", 1);
+
+ /* Set global program name that is not polluted with libtool artifacts. */
+ set_program_name (argv[0]);
+
+ memset (&sa, 0, sizeof sa);
+ sa.sa_handler = SIG_IGN;
+ sa.sa_flags = SA_RESTART;
+ sigaction (SIGPIPE, &sa, NULL);
+
+ /* Various initialization. */
+ init_dir_caches ();
+
+ g = guestfs_create ();
+ if (g == NULL) {
+ fprintf (stderr, _("guestfs_create: failed to create handle\n"));
+ exit (1);
+ }
+
+ guestfs_set_autosync (g, 1);
+ guestfs_set_recovery_proc (g, 0);
+
+ ADD_FUSE_ARG (program_name);
+ /* MUST be single-threaded. You cannot have two threads accessing the
+ * same libguestfs handle, and opening more than one handle is likely
+ * to be very expensive.
+ */
+ ADD_FUSE_ARG ("-s");
+
+ /* If developing, add ./appliance to the path. Note that libtools
+ * interferes with this because uninstalled guestfish is a shell
+ * script that runs the real program with an absolute path. Detect
+ * that too.
+ *
+ * BUT if LIBGUESTFS_PATH environment variable is already set by
+ * the user, then don't override it.
+ */
+ if (getenv ("LIBGUESTFS_PATH") == NULL &&
+ argv[0] &&
+ (argv[0][0] != '/' || strstr (argv[0], "/.libs/lt-") != NULL))
+ guestfs_set_path (g, "appliance:" GUESTFS_DEFAULT_PATH);
+
+ for (;;) {
+ c = getopt_long (argc, argv, options, long_options, &option_index);
+ if (c == -1) break;
+
+ switch (c) {
+ case 0: /* options which are long only */
+ if (strcmp (long_options[option_index].name, "dir-cache-timeout") == 0)
+ dir_cache_timeout = atoi (optarg);
+ else if (strcmp (long_options[option_index].name, "fuse-help") == 0)
+ fuse_help ();
+ else if (strcmp (long_options[option_index].name, "selinux") == 0)
+ guestfs_set_selinux (g, 1);
+ else if (strcmp (long_options[option_index].name, "trace") == 0) {
+ ADD_FUSE_ARG ("-f");
+ guestfs_set_trace (g, 1);
+ guestfs_set_recovery_proc (g, 1);
+ }
+ else {
+ fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
+ program_name, long_options[option_index].name, option_index);
+ exit (1);
+ }
+ break;
+
+ case 'a':
+ if (access (optarg, R_OK) != 0) {
+ perror (optarg);
+ exit (1);
+ }
+ drv = malloc (sizeof (struct drv));
+ if (!drv) {
+ perror ("malloc");
+ exit (1);
+ }
+ drv->filename = optarg;
+ drv->next = drvs;
+ drvs = drv;
+ break;
+
+ case 'm':
+ mp = malloc (sizeof (struct mp));
+ if (!mp) {
+ perror ("malloc");
+ exit (1);
+ }
+ p = strchr (optarg, ':');
+ if (p) {
+ *p = '\0';
+ mp->mountpoint = p+1;
+ } else
+ mp->mountpoint = bad_cast ("/");
+ mp->device = optarg;
+ mp->next = mps;
+ mps = mp;
+ break;
+
+ case 'n':
+ guestfs_set_autosync (g, 0);
+ break;
+
+ case 'o':
+ ADD_FUSE_ARG ("-o");
+ ADD_FUSE_ARG (optarg);
+ break;
+
+ case 'r':
+ read_only = 1;
+ break;
+
+ case 'v':
+ verbose++;
+ guestfs_set_verbose (g, verbose);
+ break;
+
+ case 'V':
+ printf ("%s %s\n", program_name, PACKAGE_VERSION);
+ exit (0);
+
+ case HELP_OPTION:
+ usage (0);
+
+ default:
+ usage (1);
+ }
+ }
+
+ /* We must have at least one -a and at least one -m. */
+ if (!drvs || !mps) {
+ fprintf (stderr,
+ _("%s: must have at least one -a and at least one -m option\n"),
+ program_name);
+ exit (1);
+ }
+
+ /* We'd better have a mountpoint. */
+ if (optind+1 != argc) {
+ fprintf (stderr,
+ _("%s: you must specify a mountpoint in the host filesystem\n"),
+ program_name);
+ exit (1);
+ }
+
+ /* Do the guest drives and mountpoints. */
+ add_drives (drvs);
+ if (guestfs_launch (g) == -1)
+ exit (1);
+ mount_mps (mps);
+
+ /* FUSE example does this, not clear if it's necessary, but ... */
+ if (guestfs_umask (g, 0) == -1)
+ exit (1);
+
+ /* At the last minute, remove the libguestfs error handler. In code
+ * above this point, the default error handler has been used which
+ * sends all errors to stderr. Now before entering FUSE itself we
+ * want to silence errors so we can convert them (see error()
+ * function above).
+ */
+ guestfs_set_error_handler (g, NULL, NULL);
+
+ /* Finish off FUSE args. */
+ ADD_FUSE_ARG (argv[optind]);
+
+ if (verbose) {
+ fprintf (stderr, "guestmount: invoking FUSE with args [");
+ for (i = 0; i < fuse_argc; ++i) {
+ if (i > 0) fprintf (stderr, ", ");
+ fprintf (stderr, "%s", fuse_argv[i]);
+ }
+ fprintf (stderr, "]\n");
+ }
+
+ r = fuse_main (fuse_argc, (char **) fuse_argv, &fg_operations, NULL);
+
+ /* Cleanup. */
+ guestfs_close (g);
+ free_dir_caches ();
+
+ exit (r == -1 ? 1 : 0);
+}
+
+/* List is built in reverse order, so add them in reverse order. */
+static void
+add_drives (struct drv *drv)
+{
+ int r;
+
+ if (drv) {
+ add_drives (drv->next);
+ if (!read_only)
+ r = guestfs_add_drive (g, drv->filename);
+ else
+ r = guestfs_add_drive_ro (g, drv->filename);
+ if (r == -1)
+ exit (1);
+ }
+}
+
+/* List is built in reverse order, so mount them in reverse order. */
+static void
+mount_mps (struct mp *mp)
+{
+ int r;
+
+ if (mp) {
+ mount_mps (mp->next);
+ if (!read_only)
+ r = guestfs_mount (g, mp->device, mp->mountpoint);
+ else
+ r = guestfs_mount_ro (g, mp->device, mp->mountpoint);
+ if (r == -1)
+ exit (1);
+ }
+}
generated by cgit (git 2.34.1) at 2024-07-07 12:16:59 +0000