[Patch v7 5/6] notmuch-new: backup tags before database upgrade

[Austin Clements]

On Sat, 05 Apr 2014, David Bremner <david at tethera.net> wrote:
> All we do here is calculate the backup filename, and call the existing
> dump routine.
>
> Also take the opportity to add a message about being safe to

opportunity

> interrupt.
> ---
>  notmuch-new.c        | 29 ++++++++++++++++++++++++++++-
>  test/T530-upgrade.sh |  4 +++-
>  2 files changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/notmuch-new.c b/notmuch-new.c
> index 82acf69..d269c7c 100644
> --- a/notmuch-new.c
> +++ b/notmuch-new.c
> @@ -989,8 +989,35 @@ notmuch_new_command (notmuch_config_t *config, int argc, char *argv[])
>  	    return EXIT_FAILURE;
>  
>  	if (notmuch_database_needs_upgrade (notmuch)) {
> -	    if (add_files_state.verbosity >= VERBOSITY_NORMAL)
> +	    time_t now = time (NULL);
> +	    struct tm *gm_time = gmtime (&now);
> +
> +	    /* since dump files are written atomically, the amount of
> +	     * harm from overwriting one within a second seems
> +	     * relatively small. */
> +
> +	    const char *backup_name =
> +		talloc_asprintf (notmuch, "%s/dump-%04d%02d%02dT%02d%02d%02d.gz",
> +				 dot_notmuch_path,
> +				 gm_time->tm_year + 1900,
> +				 gm_time->tm_mon + 1,
> +				 gm_time->tm_mday,
> +				 gm_time->tm_hour,
> +				 gm_time->tm_min,
> +				 gm_time->tm_sec);
> +
> +	    if (add_files_state.verbosity >= VERBOSITY_NORMAL) {
>  		printf ("Welcome to a new version of notmuch! Your database will now be upgraded.\n");
> +		printf ("This process is safe to interrupt.\n");
> +		printf ("Backing up tags to %s...\n", backup_name);
> +	    }
> +
> +	    if (notmuch_database_dump (notmuch, backup_name, "",
> +				       DUMP_FORMAT_BATCH_TAG, TRUE)) {
> +		fprintf (stderr, "Backup failed. Aborting upgrade.");
> +		return EXIT_FAILURE;
> +	    }
> +
>  	    gettimeofday (&add_files_state.tv_start, NULL);
>  	    notmuch_database_upgrade (notmuch,
>  				      add_files_state.verbosity >= VERBOSITY_NORMAL ? upgrade_print_progress : NULL,
> diff --git a/test/T530-upgrade.sh b/test/T530-upgrade.sh
> index 67bbf31..d46e3d1 100755
> --- a/test/T530-upgrade.sh
> +++ b/test/T530-upgrade.sh
> @@ -26,9 +26,11 @@ output=$(notmuch search path:foo)
>  test_expect_equal "$output" ""
>  
>  test_begin_subtest "database upgrade from format version 1"
> -output=$(notmuch new)
> +output=$(notmuch new | sed -e 's/^Backing up tags to .*$/Backing up tags to FILENAME/')
>  test_expect_equal "$output" "\
>  Welcome to a new version of notmuch! Your database will now be upgraded.
> +This process is safe to interrupt.
> +Backing up tags to FILENAME
>  Your notmuch database has now been upgraded to database format version 2.
>  No new mail."
>  
> -- 
> 1.9.0
>
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