Blame SOURCES/0187-grub-editenv-Add-incr-command-to-increment-integer-v.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 4 Jun 2018 19:49:47 +0200
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Subject: [PATCH] grub-editenv: Add "incr" command to increment integer value
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 env. variables
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To be able to automatically detect if the last boot was successful,
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We want to keep count of succesful / failed boots in some integer
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environment variable.
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This commit adds a grub-editenvt "incr" command to increment such
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integer value env. variables by 1 for use from various boot scripts.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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 util/grub-editenv.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
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 1 file changed, 50 insertions(+)
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diff --git a/util/grub-editenv.c b/util/grub-editenv.c
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index 118e89fe5..2918bb71c 100644
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--- a/util/grub-editenv.c
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+++ b/util/grub-editenv.c
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@@ -53,6 +53,9 @@ static struct argp_option options[] = {
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   /* TRANSLATORS: "unset" is a keyword. It's a summary of "unset" subcommand.  */
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   {N_("unset [NAME ...]"),    0, 0, OPTION_DOC|OPTION_NO_USAGE,
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    N_("Delete variables."), 0},
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+  /* TRANSLATORS: "incr" is a keyword. It's a summary of "incr" subcommand.  */
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+  {N_("incr [NAME ...]"),     0, 0, OPTION_DOC|OPTION_NO_USAGE,
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+   N_("Increase value of integer variables."), 0},
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   {0,         0, 0, OPTION_DOC, N_("Options:"), -1},
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   {"verbose", 'v', 0, 0, N_("print verbose messages."), 0},
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@@ -246,6 +249,51 @@ unset_variables (const char *name, int argc, char *argv[])
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   grub_envblk_close (envblk);
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 }
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+struct get_int_value_params {
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+  char *varname;
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+  int value;
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+};
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+
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+static int
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+get_int_value (const char *varname, const char *value, void *hook_data)
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+{
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+  struct get_int_value_params *params = hook_data;
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+
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+  if (strcmp (varname, params->varname) == 0) {
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+    params->value = strtol (value, NULL, 10);
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+    return 1;
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+  }
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+  return 0;
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+}
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+
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+static void
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+incr_variables (const char *name, int argc, char *argv[])
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+{
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+  grub_envblk_t envblk;
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+  char buf[16];
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+
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+  envblk = open_envblk_file (name);
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+  while (argc)
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+    {
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+      struct get_int_value_params params = {
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+        .varname = argv[0],
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+        .value = 0, /* Consider unset variables 0 */
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+      };
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+
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+      grub_envblk_iterate (envblk, &params, get_int_value);
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+      snprintf(buf, sizeof(buf), "%d", params.value + 1);
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+
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+      if (! grub_envblk_set (envblk, argv[0], buf))
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+        grub_util_error ("%s", _("environment block too small"));
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+
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+      argc--;
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+      argv++;
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+    }
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+
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+  write_envblk (name, envblk);
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+  grub_envblk_close (envblk);
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+}
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+
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 int
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 main (int argc, char *argv[])
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 {
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@@ -285,6 +333,8 @@ main (int argc, char *argv[])
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     set_variables (filename, argc - curindex, argv + curindex);
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   else if (strcmp (command, "unset") == 0)
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     unset_variables (filename, argc - curindex, argv + curindex);
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+  else if (strcmp (command, "incr") == 0)
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+    incr_variables (filename, argc - curindex, argv + curindex);
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   else
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     {
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       char *program = xstrdup(program_name);