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Date: Mon, 28 Apr 2014 10:33:40 -0500
From: Eric Sandeen <sandeen@...hat.com>
To: "Theodore Ts'o" <tytso@....edu>,
Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 5/7] mke2fs: proceed if the user doesn't type anything
after 5 seconds
On 4/26/14, 7:00 PM, Theodore Ts'o wrote:
> If mke2fs needs to ask the user for permission, and the user doesn't
> type anything for five seconds, proceed as if the user had said yes.
>
> This will allow us to add more stringent checks without breaking
> existing scripts (much).
Hm, this sounds a little dangerous - "-F" overrides a lot.
What motivates this?
Would it be worth treating this differently depending on whether or
not we're on a tty?
While we're at it, I see that you've added another tunable to a conf file.
Where are these documented?
Thanks,
-Eric
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
> misc/mke2fs.c | 12 ++++++++----
> misc/tune2fs.c | 2 +-
> misc/util.c | 29 ++++++++++++++++++++++++++---
> misc/util.h | 2 +-
> 4 files changed, 36 insertions(+), 9 deletions(-)
>
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index a2b1f65..799132a 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -102,6 +102,7 @@ static __u32 fs_stride;
> static int quotatype = -1; /* Initialize both user and group quotas by default */
> static __u64 offset;
> static blk64_t journal_location = ~0LL;
> +static int proceed_delay = -1;
>
> static struct ext2_super_block fs_param;
> static char *fs_uuid = NULL;
> @@ -1749,9 +1750,12 @@ profile_error:
> if (optind < argc)
> usage();
>
> + profile_get_integer(profile, "options", "proceed_delay", 0, 5,
> + &proceed_delay);
> +
> if (!check_plausibility(device_name, CREATE_FILE,
> &is_device) && !force)
> - proceed_question();
> + proceed_question(proceed_delay);
>
> check_mount(device_name, force, _("filesystem"));
>
> @@ -1797,7 +1801,7 @@ profile_error:
> } else if (!force && is_device && (fs_blocks_count > dev_size)) {
> com_err(program_name, 0, "%s",
> _("Filesystem larger than apparent device size."));
> - proceed_question();
> + proceed_question(proceed_delay);
> }
>
> if (!fs_type)
> @@ -2071,7 +2075,7 @@ profile_error:
> com_err(program_name, 0,
> _("%d-byte blocks too big for system (max %d)"),
> blocksize, sys_page_size);
> - proceed_question();
> + proceed_question(proceed_delay);
> }
> fprintf(stderr, _("Warning: %d-byte blocks too big for system "
> "(max %d), forced to continue\n"),
> @@ -2785,7 +2789,7 @@ int main (int argc, char *argv[])
>
> if (!check_plausibility(journal_device, CHECK_BLOCK_DEV,
> NULL) && !force)
> - proceed_question();
> + proceed_question(proceed_delay);
> check_mount(journal_device, force, _("journal"));
>
> retval = ext2fs_open(journal_device, EXT2_FLAG_RW|
> diff --git a/misc/tune2fs.c b/misc/tune2fs.c
> index fbf5f52..7b3723b 100644
> --- a/misc/tune2fs.c
> +++ b/misc/tune2fs.c
> @@ -675,7 +675,7 @@ static int add_journal(ext2_filsys fs)
> if (journal_device) {
> if (!check_plausibility(journal_device, CHECK_BLOCK_DEV,
> NULL))
> - proceed_question();
> + proceed_question(-1);
> check_mount(journal_device, 0, _("journal"));
> #ifdef CONFIG_TESTIO_DEBUG
> if (getenv("TEST_IO_FLAGS") || getenv("TEST_IO_BLOCK")) {
> diff --git a/misc/util.c b/misc/util.c
> index f85942e..afb0058 100644
> --- a/misc/util.c
> +++ b/misc/util.c
> @@ -14,6 +14,8 @@
>
> #include "config.h"
> #include <fcntl.h>
> +#include <setjmp.h>
> +#include <signal.h>
> #include <stdio.h>
> #include <string.h>
> #ifdef HAVE_ERRNO_H
> @@ -68,18 +70,39 @@ char *get_progname(char *argv_zero)
> return cp+1;
> }
>
> -void proceed_question(void)
> +static jmp_buf alarm_env;
> +
> +static void alarm_signal(int signal)
> +{
> + longjmp(alarm_env, 1);
> +}
> +
> +void proceed_question(int delay)
> {
> char buf[256];
> const char *short_yes = _("yY");
>
> fflush(stdout);
> fflush(stderr);
> - fputs(_("Proceed anyway? (y,n) "), stdout);
> + if (delay > 0) {
> + if (setjmp(alarm_env)) {
> + signal(SIGALRM, SIG_IGN);
> + printf(_("<proceeding>\n"));
> + return;
> + }
> + signal(SIGALRM, alarm_signal);
> + printf(_("Proceed anyway (or wait %d seconds) ? (y,n) "),
> + delay);
> + alarm(delay);
> + } else
> + fputs(_("Proceed anyway? (y,n) "), stdout);
> buf[0] = 0;
> if (!fgets(buf, sizeof(buf), stdin) ||
> - strchr(short_yes, buf[0]) == 0)
> + strchr(short_yes, buf[0]) == 0) {
> + putc('\n', stdout);
> exit(1);
> + }
> + signal(SIGALRM, SIG_IGN);
> }
>
> /*
> diff --git a/misc/util.h b/misc/util.h
> index b80d489..9de3fbf 100644
> --- a/misc/util.h
> +++ b/misc/util.h
> @@ -25,7 +25,7 @@ extern char *journal_location_string;
> extern int strcasecmp (char *s1, char *s2);
> #endif
> extern char *get_progname(char *argv_zero);
> -extern void proceed_question(void);
> +extern void proceed_question(int delay);
> extern int check_plausibility(const char *device, int flags,
> int *ret_is_dev);
> extern void parse_journal_opts(const char *opts);
>
--
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