>From 55c1749bed8092d27fdd3938b220e9c22425871f Mon Sep 17 00:00:00 2001
From: Luther Thompson <address@hidden>
Date: Wed, 8 Dec 2010 19:56:32 -0500
Subject: [PATCH 1/3] md5sum: Added option '--ignore-missing'

With '--check', suppresses error messages for nonexistant files.

* src/md5sum.c (ignore_missing, long_options, usage, main): Add option
-i/--ignore-missing.
(digest_file): If fopen fails, ignore_missing suppresses the error
message.
(digest_check): ignore_missing suppresses the 'FAILED' message.
---
 src/md5sum.c |   24 ++++++++++++++++++++----
 1 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/md5sum.c b/src/md5sum.c
index a660e3b..9635692 100644
--- a/src/md5sum.c
+++ b/src/md5sum.c
@@ -122,6 +122,9 @@ static bool warn = false;
 /* With --check, suppress the "OK" printed for each verified file.  */
 static bool quiet = false;
 
+/* With --check, suppress the error message for each non-existant file. */
+static bool ignore_missing = false;
+
 /* For long options that have no equivalent short option, use a
    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
 enum
@@ -138,6 +141,7 @@ static struct option const long_options[] =
   { "status", no_argument, NULL, STATUS_OPTION },
   { "text", no_argument, NULL, 't' },
   { "warn", no_argument, NULL, 'w' },
+  { "ignore-missing", no_argument, NULL, 'i' },
   { GETOPT_HELP_OPTION_DECL },
   { GETOPT_VERSION_OPTION_DECL },
   { NULL, 0, NULL, 0 }
@@ -181,10 +185,11 @@ With no FILE, or when FILE is -, read standard input.\n\
 "), stdout);
       fputs (_("\
 \n\
-The following three options are useful only when verifying checksums:\n\
+The following four options are useful only when verifying checksums:\n\
       --quiet             don't print OK for each successfully verified file\n\
       --status            don't output anything, status code shows success\n\
   -w, --warn              warn about improperly formatted checksum lines\n\
+  -i, --ignore-missing    don't report errors for missing files\n\
 \n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
@@ -402,7 +407,8 @@ digest_file (const char *filename, int *binary, unsigned char *bin_result)
       fp = fopen (filename, (O_BINARY && *binary ? "rb" : "r"));
       if (fp == NULL)
         {
-          error (0, errno, "%s", filename);
+	  if (!ignore_missing)
+	    error (0, errno, "%s", filename);
           return false;
         }
     }
@@ -516,7 +522,7 @@ digest_check (const char *checkfile_name)
           if (!ok)
             {
               ++n_open_or_read_failures;
-              if (!status_only)
+              if (!status_only && !ignore_missing)
                 {
                   printf (_("%s: FAILED open or read\n"), filename);
                 }
@@ -626,7 +632,7 @@ main (int argc, char **argv)
      so that processes running in parallel do not intersperse their output.  */
   setvbuf (stdout, NULL, _IOLBF, 0);
 
-  while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
+  while ((opt = getopt_long (argc, argv, "bcitw", long_options, NULL)) != -1)
     switch (opt)
       {
       case 'b':
@@ -653,6 +659,9 @@ main (int argc, char **argv)
         warn = false;
         quiet = true;
         break;
+      case 'i':
+	ignore_missing = true;
+	break;
       case_GETOPT_HELP_CHAR;
       case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
       default:
@@ -690,6 +699,13 @@ main (int argc, char **argv)
       usage (EXIT_FAILURE);
     }
 
+  if (ignore_missing && !do_check)
+    {
+      error (0, 0,
+       _("the --ignore-missing option is meaningful only when verifying checksums"));
+      usage (EXIT_FAILURE);
+    }
+
   if (!O_BINARY && binary < 0)
     binary = 0;
 
-- 
1.7.0.4