562 lines
12 KiB
C
562 lines
12 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <libmount.h>
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#include <blkid.h>
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#include <sys/utsname.h>
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#include "nls.h"
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#include "c.h"
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#include "strutils.h"
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#include "xalloc.h"
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#include "findmnt.h"
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struct verify_context {
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struct libmnt_fs *fs;
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struct libmnt_table *tb;
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char **fs_ary;
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size_t fs_num;
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size_t fs_alloc;
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int nwarnings;
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int nerrors;
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unsigned int target_printed : 1,
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no_fsck : 1;
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};
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static void verify_mesg(struct verify_context *vfy, char type, const char *fmt, va_list ap)
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{
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if (!vfy->target_printed) {
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fprintf(stdout, "%s\n", mnt_fs_get_target(vfy->fs));
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vfy->target_printed = 1;
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}
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fprintf(stdout, " [%c] ", type);
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vfprintf(stdout, fmt, ap);
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fputc('\n', stdout);
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}
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static int verify_warn(struct verify_context *vfy, const char *fmt, ...)
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{
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va_list ap;
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vfy->nwarnings++;
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va_start(ap, fmt);
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verify_mesg(vfy, 'W', fmt, ap);
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va_end(ap);
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return 0;
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}
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static int verify_err(struct verify_context *vfy, const char *fmt, ...)
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{
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va_list ap;
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vfy->nerrors++;
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va_start(ap, fmt);
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verify_mesg(vfy, 'E', fmt, ap);
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va_end(ap);
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return 0;
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}
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static int verify_ok(struct verify_context *vfy __attribute__((unused)),
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const char *fmt, ...)
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{
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va_list ap;
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if (!(flags & FL_VERBOSE))
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return 0;
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va_start(ap, fmt);
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verify_mesg(vfy, ' ', fmt, ap);
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va_end(ap);
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return 0;
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}
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static int verify_order(struct verify_context *vfy)
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{
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struct libmnt_iter *itr = NULL;
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struct libmnt_fs *next;
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const char *tgt;
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tgt = mnt_fs_get_target(vfy->fs);
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if (tgt && !(flags & FL_NOCACHE))
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tgt = mnt_resolve_target(tgt, cache);
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else if (!tgt)
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return 0;
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itr = mnt_new_iter(MNT_ITER_FORWARD);
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if (!itr) {
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warn(_("failed to initialize libmount iterator"));
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goto done;
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}
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/* set iterator position to 'fs' */
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mnt_table_set_iter(vfy->tb, itr, vfy->fs);
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if (mnt_table_next_fs(vfy->tb, itr, &next) != 0)
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goto done;
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/* scan all next filesystems */
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while (mnt_table_next_fs(vfy->tb, itr, &next) == 0) {
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const char *n_tgt;
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size_t len;
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n_tgt = mnt_fs_get_target(next);
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if (n_tgt && !(flags & FL_NOCACHE))
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n_tgt = mnt_resolve_target(n_tgt, cache);
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else if (!n_tgt)
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continue;
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len = strlen(n_tgt);
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if (strncmp(n_tgt, tgt, len) == 0) {
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if (*(tgt + len) == '\0')
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verify_warn(vfy, _("target specified more than once"));
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else if (*(tgt + len) == '/')
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verify_err(vfy, _("wrong order: %s specified before %s"), tgt, n_tgt);
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}
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}
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done:
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mnt_free_iter(itr);
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return 0;
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}
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static int verify_target(struct verify_context *vfy)
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{
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const char *tgt = mnt_fs_get_target(vfy->fs);
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struct stat sb;
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if (!tgt)
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return verify_err(vfy, _("undefined target (fs_file)"));
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if (!(flags & FL_NOCACHE)) {
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const char *cn = mnt_resolve_target(tgt, cache);
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if (!cn)
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return -ENOMEM;
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if (strcmp(cn, tgt) != 0)
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verify_warn(vfy, _("non-canonical target path (real: %s)"), cn);
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tgt = cn;
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}
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if (stat(tgt, &sb) != 0) {
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if (mnt_fs_get_option(vfy->fs, "noauto", NULL, NULL) == 1)
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verify_err(vfy, _("unreachable on boot required target: %m"));
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else
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verify_warn(vfy, _("unreachable target: %m"));
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} else if (!S_ISDIR(sb.st_mode)
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&& mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 1) {
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verify_err(vfy, _("target is not a directory"));
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} else
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verify_ok(vfy, _("target exists"));
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return 0;
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}
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static char *verify_tag(struct verify_context *vfy, const char *name,
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const char *value)
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{
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char *src = NULL;
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if (!(flags & FL_NOCACHE))
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src = mnt_resolve_tag(name, value, cache);
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if (!src) {
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if (mnt_fs_get_option(vfy->fs, "noauto", NULL, NULL) == 1)
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verify_err(vfy, _("unreachable on boot required source: %s=%s"), name, value);
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else
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verify_warn(vfy, _("unreachable: %s=%s"), name, value);
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} else
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verify_ok(vfy, _("%s=%s translated to %s"), name, value, src);
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return src;
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}
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/* Note that mount source is very FS specific and we should not
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* interpret unreachable source as error. The exception is only
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* NAME=value, this has to be convertible to device name.
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*/
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static int verify_source(struct verify_context *vfy)
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{
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const char *src = mnt_fs_get_srcpath(vfy->fs);
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char *t = NULL, *v = NULL;
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struct stat sb;
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int isbind, rc = 0;
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/* source is NAME=value tag */
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if (!src) {
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const char *tag = NULL, *val = NULL;
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if (mnt_fs_get_tag(vfy->fs, &tag, &val) != 0)
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return verify_err(vfy, _("undefined source (fs_spec)"));
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src = verify_tag(vfy, tag, val);
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if (!src)
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goto done;
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/* blkid is able to parse it, but libmount does not see it as a tag --
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* it means unsupported tag */
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} else if (blkid_parse_tag_string(src, &t, &v) == 0 && stat(src, &sb) != 0) {
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rc = verify_err(vfy, _("unsupported source tag: %s"), src);
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goto done;
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}
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isbind = mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 0;
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/* source is path */
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if (mnt_fs_is_pseudofs(vfy->fs) || mnt_fs_is_netfs(vfy->fs))
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verify_ok(vfy, _("do not check %s source (pseudo/net)"), src);
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else if (stat(src, &sb) != 0)
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verify_warn(vfy, _("unreachable source: %s: %m"), src);
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else if ((S_ISDIR(sb.st_mode) || S_ISREG(sb.st_mode)) && !isbind)
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verify_warn(vfy, _("non-bind mount source %s is a directory or regular file"), src);
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else if (!S_ISBLK(sb.st_mode) && !isbind)
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verify_warn(vfy, _("source %s is not a block device"), src);
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else
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verify_ok(vfy, _("source %s exists"), src);
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done:
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free(t);
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free(v);
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return rc;
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}
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static int verify_options(struct verify_context *vfy)
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{
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const char *opts;
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opts = mnt_fs_get_vfs_options(vfy->fs);
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if (opts)
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verify_ok(vfy, _("VFS options: %s"), opts);
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opts = mnt_fs_get_fs_options(vfy->fs);
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if (opts)
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verify_ok(vfy, _("FS options: %s"), opts);
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opts = mnt_fs_get_user_options(vfy->fs);
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if (opts)
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verify_ok(vfy, _("userspace options: %s"), opts);
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return 0;
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}
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static int verify_swaparea(struct verify_context *vfy)
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{
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char *arg;
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size_t argsz = 0;
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if (mnt_fs_get_option(vfy->fs, "discard", &arg, &argsz) == 0
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&& arg
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&& strncmp(arg, "once", argsz) != 0
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&& strncmp(arg, "pages", argsz) != 0)
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verify_err(vfy, _("unsupported swaparea discard policy: %s"), arg);
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if (mnt_fs_get_option(vfy->fs, "pri", &arg, &argsz) == 0 && arg) {
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char *p = arg;
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if (*p == '-')
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p++;
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for (; p < arg + argsz; p++) {
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if (!isdigit((unsigned char) *p)) {
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verify_err(vfy, _("failed to parse swaparea priority option"));
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break;
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}
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}
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}
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return 0;
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}
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static int is_supported_filesystem(struct verify_context *vfy, const char *name)
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{
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size_t n;
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if (!vfy->fs_num)
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return 0;
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for (n = 0; n < vfy->fs_num; n++ ) {
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if (strcmp(vfy->fs_ary[n], name) == 0)
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return 1;
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}
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return 0;
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}
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static int add_filesystem(struct verify_context *vfy, const char *name)
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{
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#define MYCHUNK 16
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if (is_supported_filesystem(vfy, name))
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return 0;
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if (vfy->fs_alloc == 0 || vfy->fs_num + 1 <= vfy->fs_alloc) {
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vfy->fs_alloc = ((vfy->fs_alloc + 1 + MYCHUNK) / MYCHUNK) * MYCHUNK;
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vfy->fs_ary = xrealloc(vfy->fs_ary, vfy->fs_alloc * sizeof(char *));
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}
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vfy->fs_ary[vfy->fs_num] = xstrdup(name);
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vfy->fs_num++;
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return 0;
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}
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static int read_proc_filesystems(struct verify_context *vfy)
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{
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int rc = 0;
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FILE *f;
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char buf[80], *cp, *t;
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f = fopen("/proc/filesystems", "r");
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if (!f)
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return -errno;
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while (!feof(f)) {
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if (!fgets(buf, sizeof(buf), f))
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break;
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cp = buf;
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if (!isspace(*cp)) {
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while (*cp && !isspace(*cp))
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cp++;
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}
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while (*cp && isspace(*cp))
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cp++;
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if ((t = strchr(cp, '\n')) != NULL)
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*t = 0;
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if ((t = strchr(cp, '\t')) != NULL)
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*t = 0;
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if ((t = strchr(cp, ' ')) != NULL)
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*t = 0;
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rc = add_filesystem(vfy, cp);
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if (rc)
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break;
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}
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fclose(f);
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return rc;
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}
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static void free_proc_filesystems(struct verify_context *vfy)
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{
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size_t n;
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if (!vfy->fs_ary)
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return;
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for (n = 0; n < vfy->fs_num; n++ )
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free(vfy->fs_ary[n]);
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free(vfy->fs_ary);
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}
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static int read_kernel_filesystems(struct verify_context *vfy)
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{
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int rc = 0;
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#ifdef __linux__
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struct utsname uts;
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FILE *f;
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char buf[1024];
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if (uname(&uts))
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return 0;
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snprintf(buf, sizeof(buf), "/lib/modules/%s/modules.dep", uts.release);
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f = fopen(buf, "r");
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if (!f)
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return 0;
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while (!feof(f)) {
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char *p, *name;
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if (!fgets(buf, sizeof(buf), f))
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break;
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if (strncmp("kernel/fs/", buf, 10) != 0 ||
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strncmp("kernel/fs/nls/", buf, 14) == 0)
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continue;
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p = strchr(buf, ':');
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if (!p)
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continue;
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*p = '\0';
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name = strrchr(buf, '/');
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if (!name)
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continue;
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name++;
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p = strstr(name, ".ko");
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if (!p)
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continue;
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*p = '\0';
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rc = add_filesystem(vfy, name);
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if (rc)
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break;
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}
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fclose(f);
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#endif /* __linux__ */
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return rc;
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}
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static int verify_fstype(struct verify_context *vfy)
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{
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char *src = mnt_resolve_spec(mnt_fs_get_source(vfy->fs), cache);
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char *realtype = NULL;
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const char *type;
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int ambi = 0, isauto = 0, isswap = 0;
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if (!src)
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return 0;
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if (mnt_fs_is_pseudofs(vfy->fs) || mnt_fs_is_netfs(vfy->fs)) {
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verify_ok(vfy, _("do not check %s FS type (pseudo/net)"), src);
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goto done;
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}
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type = mnt_fs_get_fstype(vfy->fs);
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if (type) {
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int none = strcmp(type, "none") == 0;
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if (none
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&& mnt_fs_get_option(vfy->fs, "bind", NULL, NULL) == 1
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&& mnt_fs_get_option(vfy->fs, "move", NULL, NULL) == 1) {
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verify_warn(vfy, _("\"none\" FS type is recommended for bind or move oprations only"));
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goto done;
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}
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if (strcmp(type, "auto") == 0)
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isauto = 1;
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else if (strcmp(type, "swap") == 0)
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isswap = 1;
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else if (strcmp(type, "xfs") == 0)
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vfy->no_fsck = 1;
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if (!isswap && !isauto && !none && !is_supported_filesystem(vfy, type))
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verify_warn(vfy, _("%s seems unsupported by the current kernel"), type);
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}
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realtype = mnt_get_fstype(src, &ambi, cache);
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if (!realtype) {
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if (isauto)
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verify_err(vfy, _("cannot detect on-disk filesystem type"));
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else
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verify_warn(vfy, _("cannot detect on-disk filesystem type"));
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goto done;
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}
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if (realtype) {
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isswap = strcmp(realtype, "swap") == 0;
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vfy->no_fsck = strcmp(realtype, "xfs") == 0;
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if (type && !isauto && strcmp(type, realtype) != 0) {
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verify_err(vfy, _("%s does not match with on-disk %s"), type, realtype);
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goto done;
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}
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if (!isswap && !is_supported_filesystem(vfy, realtype)) {
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verify_err(vfy, _("on-disk %s seems unsupported by the current kernel"), realtype);
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goto done;
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}
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verify_ok(vfy, _("FS type is %s"), realtype);
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}
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done:
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if (!cache) {
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free(src);
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free(realtype);
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}
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return 0;
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}
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static int verify_passno(struct verify_context *vfy)
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{
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int passno = mnt_fs_get_passno(vfy->fs);
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const char *tgt = mnt_fs_get_target(vfy->fs);
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if (tgt && strcmp("/", tgt) == 0 && passno != 1 && !vfy->no_fsck)
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return verify_warn(vfy, _("recommended root FS passno is 1 (current is %d)"), passno);
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return 0;
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}
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static int verify_filesystem(struct verify_context *vfy)
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{
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int rc = 0;
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if (mnt_fs_is_swaparea(vfy->fs))
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rc = verify_swaparea(vfy);
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else {
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rc = verify_target(vfy);
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if (!rc)
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rc = verify_options(vfy);
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}
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if (!rc)
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rc = verify_source(vfy);
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if (!rc)
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rc = verify_fstype(vfy);
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if (!rc)
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rc = verify_passno(vfy); /* depends on verify_fstype() */
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return rc;
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}
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int verify_table(struct libmnt_table *tb)
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{
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struct verify_context vfy = { .nerrors = 0 };
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struct libmnt_iter *itr;
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int rc = 0; /* overall return code (alloc errors, etc.) */
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int check_order = is_listall_mode();
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static int has_read_fs = 0;
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itr = mnt_new_iter(MNT_ITER_FORWARD);
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if (!itr) {
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warn(_("failed to initialize libmount iterator"));
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goto done;
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}
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vfy.tb = tb;
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if (has_read_fs == 0) {
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read_proc_filesystems(&vfy);
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read_kernel_filesystems(&vfy);
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has_read_fs = 1;
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}
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while (rc == 0 && (vfy.fs = get_next_fs(tb, itr))) {
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vfy.target_printed = 0;
|
|
vfy.no_fsck = 0;
|
|
|
|
if (check_order)
|
|
rc = verify_order(&vfy);
|
|
if (!rc)
|
|
rc = verify_filesystem(&vfy);
|
|
|
|
if (flags & FL_FIRSTONLY)
|
|
break;
|
|
flags |= FL_NOSWAPMATCH;
|
|
}
|
|
|
|
done:
|
|
mnt_free_iter(itr);
|
|
|
|
/* summary */
|
|
if (vfy.nerrors || parse_nerrors || vfy.nwarnings) {
|
|
fputc('\n', stderr);
|
|
fprintf(stderr, P_("%d parse error", "%d parse errors", parse_nerrors), parse_nerrors);
|
|
fprintf(stderr, P_(", %d error", ", %d errors", vfy.nerrors), vfy.nerrors);
|
|
fprintf(stderr, P_(", %d warning", ", %d warnings", vfy.nwarnings), vfy.nwarnings);
|
|
fputc('\n', stderr);
|
|
} else
|
|
fprintf(stdout, _("Success, no errors or warnings detected\n"));
|
|
|
|
|
|
free_proc_filesystems(&vfy);
|
|
|
|
return rc != 0 ? rc : vfy.nerrors + parse_nerrors;
|
|
}
|