mount: improve --move error message on shared trees
Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -448,6 +448,11 @@ accessed under newdir. The physical location of the files is not changed.
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Note that the
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.I olddir
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has to be a mountpoint.
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Note that moving a mount residing under a shared mount is invalid and
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unsupported. Use
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.B findmnt -o TARGET,PROPAGATION /dir
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to see the current propagation flags.
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.RE
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.B The shared subtrees operations.
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@ -321,6 +321,37 @@ static void selinux_warning(struct libmnt_context *cxt, const char *tgt)
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# define selinux_warning(_x, _y)
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#endif
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/*
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* Returns 1 if @dir parent is shared
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*/
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static int is_shared_tree(struct libmnt_context *cxt, const char *dir)
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{
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struct libmnt_table *tb = NULL;
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struct libmnt_fs *fs;
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unsigned long mflags = 0;
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char *mnt = NULL, *p;
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int rc = 0;
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if (!dir)
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return 0;
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if (mnt_context_get_mtab(cxt, &tb) || !tb)
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goto done;
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mnt = xstrdup(dir);
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p = strrchr(mnt, '/');
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if (!p)
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goto done;
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if (p > mnt)
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*p = '\0';
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fs = mnt_table_find_mountpoint(tb, mnt, MNT_ITER_BACKWARD);
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rc = fs && mnt_fs_is_kernel(fs)
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&& mnt_fs_get_propagation(fs, &mflags) == 0
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&& (mflags & MS_SHARED);
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done:
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free(mnt);
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return rc;
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}
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/*
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* rc = 0 success
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* <0 error (usually -errno or -1)
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@ -475,11 +506,11 @@ try_readonly:
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break;
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}
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case ENOENT:
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if (lstat(tgt, &st))
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if (tgt && lstat(tgt, &st))
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warnx(_("mount point %s does not exist"), tgt);
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else if (stat(tgt, &st))
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else if (tgt && stat(tgt, &st))
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warnx(_("mount point %s is a symbolic link to nowhere"), tgt);
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else if (stat(src, &st)) {
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else if (src && stat(src, &st)) {
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if (uflags & MNT_MS_NOFAIL)
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return MOUNT_EX_SUCCESS;
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@ -493,7 +524,7 @@ try_readonly:
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case ENOTDIR:
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if (stat(tgt, &st) || ! S_ISDIR(st.st_mode))
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warnx(_("mount point %s is not a directory"), tgt);
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else if (stat(src, &st) && errno == ENOTDIR) {
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else if (src && stat(src, &st) && errno == ENOTDIR) {
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if (uflags & MNT_MS_NOFAIL)
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return MOUNT_EX_SUCCESS;
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@ -510,6 +541,9 @@ try_readonly:
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warnx(_("%s not mounted or bad option"), tgt);
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else if (rc == -MNT_ERR_APPLYFLAGS)
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warnx(_("%s is not mountpoint or bad option"), tgt);
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else if ((mflags & MS_MOVE) && is_shared_tree(cxt, src))
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warnx(_("bad option. Note that moving a mount residing under a shared\n"
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" mount is unsupported."));
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else
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warnx(_("wrong fs type, bad option, bad superblock on %s,\n"
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" missing codepage or helper program, or other error"),
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@ -520,9 +554,9 @@ try_readonly:
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" (for several filesystems (e.g. nfs, cifs) you might\n"
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" need a /sbin/mount.<type> helper program)\n"));
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fprintf(stderr, _(
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fprintf(stderr, _("\n"
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" In some cases useful info is found in syslog - try\n"
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" dmesg | tail or so\n"));
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" dmesg | tail or so.\n"));
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break;
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case EMFILE:
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