glibc: use autofs mount hint in getmntent_r()

  And here is the new test.

Thanks,
Florian

Add misc/tst-mntent-autofs, testing autofs "ignore" filtering

2019-09-02  Florian Weimer  <fweimer@redhat.com>

	* misc/tst-mntent-autofs.c: New file.
	* misc/Makefile (tests): Add misc/tst-mntent-autofs.
  

On Mon, 2019-09-02 at 13:34 +0200, Florian Weimer wrote:
> And here is the new test.

I see what you mean about writing the test needing some knowledge
of the infrastructure.

It's good to have along with the change, thanks.

> 
> Thanks,
> Florian
> 
> Add misc/tst-mntent-autofs, testing autofs "ignore" filtering
> 
> 2019-09-02  Florian Weimer  <fweimer@redhat.com>
> 
> 	* misc/tst-mntent-autofs.c: New file.
> 	* misc/Makefile (tests): Add misc/tst-mntent-autofs.
> 
> diff --git a/misc/Makefile b/misc/Makefile
> index 032f28fc38..afb8b023e8 100644
> --- a/misc/Makefile
> +++ b/misc/Makefile
> @@ -86,7 +86,8 @@ tests := tst-dirname tst-tsearch tst-fdset tst-
> mntent tst-hsearch \
>  	 tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240 \
>  	 tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \
>  	 tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide \
> -	 tst-ldbl-warn tst-ldbl-error tst-dbl-efgcvt tst-ldbl-efgcvt
> +	 tst-ldbl-warn tst-ldbl-error tst-dbl-efgcvt tst-ldbl-efgcvt \
> +	 tst-mntent-autofs
>  
>  # Tests which need libdl.
>  ifeq (yes,$(build-shared))
> diff --git a/misc/tst-mntent-autofs.c b/misc/tst-mntent-autofs.c
> new file mode 100644
> index 0000000000..bf4d4e73b4
> --- /dev/null
> +++ b/misc/tst-mntent-autofs.c
> @@ -0,0 +1,141 @@
> +/* Test autofs "ignore" filtering for getment_r.
> +   Copyright (C) 2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it
> and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later
> version.
> +
> +   The GNU C Library 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
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>;.  */
> +
> +#include <array_length.h>
> +#include <errno.h>
> +#include <mntent.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <support/check.h>
> +#include <support/temp_file.h>
> +#include <support/xstdio.h>
> +#include <support/xunistd.h>
> +
> +struct test_case
> +{
> +  const char *line;
> +  struct
> +  {
> +    /* Like struct mntent, but with const pointers.  */
> +    const char *mnt_fsname;
> +    const char *mnt_dir;
> +    const char *mnt_type;
> +    const char *mnt_opts;
> +    int mnt_freq;
> +    int mnt_passno;
> +  } expected;
> +};
> +
> +static struct test_case test_cases[] =
> +  {
> +    { "/etc/auto.direct /mnt/auto/1 autofs defaults 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/1", "autofs", "defaults", 0,
> 0 } },
> +
> +    /* These entries are filtered out.  */
> +    { "/etc/auto.2 /mnt/auto/2 autofs ignore 0 0", { NULL, } },
> +    { "/etc/auto.3 /mnt/auto/3 autofs ignore,other 1 2", { NULL, }
> },
> +    { "/etc/auto.4 /mnt/auto/4 autofs other,ignore 3 4", { NULL, }
> },
> +    { "/etc/auto.5 /mnt/auto/5 autofs opt1,ignore,opt2 5 6", { NULL,
> } },
> +
> +    /* Dummy entry to make the desynchronization more obvious.  */
> +    { "/dev/sda1 / xfs defaults 0 0",
> +      { "/dev/sda1", "/", "xfs", "defaults", 0, 0 } },
> +
> +    /* These are not filtered because the file system is not
> autofs.  */
> +    { "/etc/auto.direct /mnt/auto/6 autofs1 ignore 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/6", "autofs1", "ignore", 0, 0
> } },
> +    { "/etc/auto.direct /mnt/auto/7 autofs1 ignore,other 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/7", "autofs1",
> "ignore,other", 0, 0 } },
> +    { "/etc/auto.direct /mnt/auto/8 autofs1 other,ignore 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/8", "autofs1",
> "other,ignore", 0, 0 } },
> +    { "/etc/auto.direct /mnt/auto/9 autofs1 opt1,ignore,opt2 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/9", "autofs1",
> "opt1,ignore,opt2", } },
> +
> +    /* These are not filtered because the string "ignore" is not an
> +       option name.  */
> +    { "/etc/auto.direct /mnt/auto/10 autofs noignore 1 2",
> +      { "/etc/auto.direct", "/mnt/auto/10", "autofs", "noignore", 1,
> 2 } },
> +    { "/etc/auto.direct /mnt/auto/11 autofs noignore,other 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/11", "autofs",
> "noignore,other", } },
> +    { "/etc/auto.direct /mnt/auto/12 autofs other,noignore 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/12", "autofs",
> "other,noignore", } },
> +    { "/etc/auto.direct /mnt/auto/13 autofs errors=ignore 0 0",
> +      { "/etc/auto.direct", "/mnt/auto/13", "autofs",
> "errors=ignore", } },
> +    { "/etc/auto.direct /mnt/auto/14 autofs errors=ignore,other 0
> 0",
> +      { "/etc/auto.direct", "/mnt/auto/14", "autofs",
> +        "errors=ignore,other", } },
> +    { "/etc/auto.direct /mnt/auto/15 autofs other,errors=ignore 0
> 0",
> +      { "/etc/auto.direct", "/mnt/auto/15", "autofs",
> +        "other,errors=ignore", } },
> +
> +    /* These are not filtered because the string is escaped.  '\151'
> +       is 'i', but it is not actually decoded by the parser.  */
> +    { "/etc/auto.\\151gnore /mnt/auto/16 autofs \\151gnore 0 0",
> +      { "/etc/auto.\\151gnore", "/mnt/auto/16", "autofs",
> +        "\\151gnore", } },
> +  };
> +
> +static int
> +do_test (void)
> +{
> +  char *path;
> +  xclose (create_temp_file ("tst-mntent-autofs-", &path));
> +
> +  /* Write the test file.  */
> +  FILE *fp = xfopen (path, "w");
> +  for (size_t i = 0; i < array_length (test_cases); ++i)
> +    fprintf (fp, "%s\n", test_cases[i].line);
> +  xfclose (fp);
> +
> +  /* Open the test file again, this time for parsing.  */
> +  fp = setmntent (path, "r");
> +  TEST_VERIFY_EXIT (fp != NULL);
> +  char buffer[512];
> +  struct mntent me;
> +
> +  for (size_t i = 0; i < array_length (test_cases); ++i)
> +    {
> +      if (test_cases[i].expected.mnt_type == NULL)
> +        continue;
> +
> +      memset (buffer, 0xcc, sizeof (buffer));
> +      memset (&me, 0xcc, sizeof (me));
> +      struct mntent *pme = getmntent_r (fp, &me, buffer, sizeof
> (buffer));
> +      TEST_VERIFY_EXIT (pme != NULL);
> +      TEST_VERIFY (pme == &me);
> +      TEST_COMPARE_STRING (test_cases[i].expected.mnt_fsname,
> me.mnt_fsname);
> +      TEST_COMPARE_STRING (test_cases[i].expected.mnt_dir,
> me.mnt_dir);
> +      TEST_COMPARE_STRING (test_cases[i].expected.mnt_type,
> me.mnt_type);
> +      TEST_COMPARE_STRING (test_cases[i].expected.mnt_opts,
> me.mnt_opts);
> +      TEST_COMPARE (test_cases[i].expected.mnt_freq, me.mnt_freq);
> +      TEST_COMPARE (test_cases[i].expected.mnt_passno,
> me.mnt_passno);
> +    }
> +
> +  TEST_VERIFY (getmntent_r (fp, &me, buffer, sizeof (buffer)) ==
> NULL);
> +
> +  TEST_COMPARE (feof (fp), 1);
> +  TEST_COMPARE (ferror (fp), 0);
> +  errno = 0;
> +  TEST_COMPARE (endmntent (fp), 1);
> +  TEST_COMPARE (errno, 0);
> +  free (path);
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>