Date:   Mon, 6 Nov 2017 12:34:06 -0500
From:   Wyllys Ingersoll <wyllys.ingersoll@...pertech.com>
To:     linux-ext4@...r.kernel.org, tytso@....edu
Subject: [PATCH] badblocks: Add options for parseable status output

This patch adds a couple of new command line arguments
to make it easier to control the frequency of the status output and make the
output more parseable.

      Add new command line arguments for badblocks utility:
           [-a alarm_interval ]   Control the frequency of status
output (in seconds)
           [-P] makes the output more parseable by external programs (comma
                 separated, LF terminated)

Signed-off-by: Wyllys Ingersoll <wyllys.ingersoll@...pertech.com>
---
 misc/badblocks.8.in | 16 +++++++++++++++-
 misc/badblocks.c    | 52 ++++++++++++++++++++++++++++++++++++++--------------
 2 files changed, 53 insertions(+), 15 deletions(-)

diff --git a/misc/badblocks.8.in b/misc/badblocks.8.in
index ca4359382..043e420db 100644
--- a/misc/badblocks.8.in
+++ b/misc/badblocks.8.in
@@ -5,7 +5,11 @@ badblocks \- search a device for bad blocks
 .SH SYNOPSIS
 .B badblocks
 [
-.B \-svwnfBX
+.B \-svwnfBXP
+]
+[
+.B \-a
+.I alarm_interval
 ]
 [
 .B \-b
@@ -83,6 +87,9 @@ and
 programs.
 .SH OPTIONS
 .TP
+.BI \-a " alarm_interval"
+Interval (in seconds) used for displaying status updates. The default is 1.
+.TP
 .BI \-b " block_size"
 Specify the size of blocks in bytes.  The default is 1024.
 .TP
@@ -199,6 +206,13 @@ option, as they are mutually exclusive.
 .B \-B
 Use buffered I/O and do not use Direct I/O, even if it is available.
 .TP
+.B \-P
+Display status in machine parseable format. The data is comma separated and
+LF terminated to make it easier to parsing by external applications. The
+data format is:
+% completed, time elapsed, read errors, write errors, corruption errors.
+Example: 10.06, 1:22, 0, 0, 0
+.TP
 .B \-X
 Internal flag only to be used by
 .BR e2fsck (8)
diff --git a/misc/badblocks.c b/misc/badblocks.c
index e45939187..571856c21 100644
--- a/misc/badblocks.c
+++ b/misc/badblocks.c
@@ -84,6 +84,8 @@ static int t_max; /* allocated test patterns */
 static unsigned int *t_patts; /* test patterns */
 static int use_buffered_io;
 static int exclusive_ok;
+static int parseable_output = 0;  /* print output that can be easily parsed */
+static int alarm_interval = 1;
 static unsigned int max_bb = MAX_BAD_BLOCKS; /* Abort test if more than this
  * number of bad blocks has been
  * encountered */
@@ -97,9 +99,10 @@ static unsigned int sys_page_size = 4096;
 static void usage(void)
 {
  fprintf(stderr, _(
-"Usage: %s [-b block_size] [-i input_file] [-o output_file] [-svwnf]\n"
+"Usage: %s [-b block_size] [-i input_file] [-o output_file] [-svwnfP]\n"
 "       [-c blocks_at_once] [-d delay_factor_between_reads] [-e
max_bad_blocks]\n"
 "       [-p num_passes] [-t test_pattern [-t test_pattern [...]]]\n"
+"       [-a alarm_interval]\n"
 "       device [last_block [first_block]]\n"),
  program_name);
  exit (1);
@@ -223,17 +226,23 @@ static void print_status(void)
  wchar_t wline_buf[128];
 #endif
  int len;
+ char format_str[128];
+
+ if (parseable_output) {
+ strcpy(format_str, "%6.2f, %s, %d, %d, %d");
+ } else {
+ strcpy(format_str, "%6.2f%% done, %s elapsed. (%d/%d/%d errors)");
+ }

  gettimeofday(&time_end, 0);
  len = snprintf(line_buf, sizeof(line_buf),
-        _("%6.2f%% done, %s elapsed. "
-          "(%d/%d/%d errors)"),
-        calc_percent((unsigned long) currently_testing,
-     (unsigned long) num_blocks),
-        time_diff_format(&time_end, &time_start, diff_buf),
-        num_read_errors,
-        num_write_errors,
-        num_corruption_errors);
+ _(format_str),
+ calc_percent((unsigned long) currently_testing,
+ (unsigned long) num_blocks),
+ time_diff_format(&time_end, &time_start, diff_buf),
+ num_read_errors,
+ num_write_errors,
+ num_corruption_errors);
 #ifdef HAVE_MBSTOWCS
  mbstowcs(wline_buf, line_buf, sizeof(line_buf));
  len = wcswidth(wline_buf, sizeof(line_buf));
@@ -241,16 +250,20 @@ static void print_status(void)
  len = strlen(line_buf); /* Should never happen... */
 #endif
  fputs(line_buf, stderr);
- memset(line_buf, '\b', len);
- line_buf[len] = 0;
- fputs(line_buf, stderr);
+ if (!parseable_output) {
+ memset(line_buf, '\b', len);
+ line_buf[len] = 0;
+ fputs(line_buf, stderr);
+ } else {
+ fputs("\n", stderr);
+ }
  fflush (stderr);
 }

 static void alarm_intr(int alnum EXT2FS_ATTR((unused)))
 {
  signal (SIGALRM, alarm_intr);
- alarm(1);
+ alarm(alarm_interval);
  if (!num_blocks)
  return;
  print_status();
@@ -1094,7 +1107,7 @@ int main (int argc, char ** argv)

  if (argc && *argv)
  program_name = *argv;
- while ((c = getopt (argc, argv, "b:d:e:fi:o:svwnc:p:h:t:BX")) != EOF) {
+ while ((c = getopt (argc, argv, "a:b:d:e:fi:o:svwnc:p:h:t:BXP")) != EOF) {
  switch (c) {
  case 'b':
  block_size = parse_uint(optarg, "block size");
@@ -1183,6 +1196,17 @@ int main (int argc, char ** argv)
  case 'X':
  exclusive_ok++;
  break;
+ case 'P':
+ parseable_output = 1;
+ break;
+ case 'a':
+ alarm_interval = parse_uint(optarg, "status alarm interval (seconds)");
+ if (alarm_interval == 0) {
+ com_err(program_name, 0, "%s",
+ _("Minimum alarm interval is 1 second"));
+ exit(1);
+ }
+ break;
  default:
  usage();
  }

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