gitenv.c

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #include "cache.h"
   5
   6 /*
   7  * This array must be sorted by its canonical name, because
   8  * we do look-up by binary search.
   9  */
  10 static struct backward_compatible_env {
  11         const char *canonical;
  12         const char *old;
  13 } bc_name[] = {
  14         { "GIT_ALTERNATE_OBJECT_DIRECTORIES", "SHA1_FILE_DIRECTORIES" },
  15         { "GIT_AUTHOR_DATE", "AUTHOR_DATE" },
  16         { "GIT_AUTHOR_EMAIL", "AUTHOR_EMAIL" },
  17         { "GIT_AUTHOR_NAME", "AUTHOR_NAME" },
  18         { "GIT_COMMITTER_EMAIL", "COMMIT_AUTHOR_EMAIL" },
  19         { "GIT_COMMITTER_NAME", "COMMIT_AUTHOR_NAME" },
  20         { "GIT_OBJECT_DIRECTORY", "SHA1_FILE_DIRECTORY" },
  21 };
  22
  23 static void warn_old_environment(int pos)
  24 {
  25         int i;
  26         static int warned = 0;
  27         if (warned)
  28                 return;
  29
  30         warned = 1;
  31         fprintf(stderr,
  32                 "warning: Attempting to use %s\n",
  33                 bc_name[pos].old);
  34         fprintf(stderr,
  35                 "warning: GIT environment variables have been renamed.\n"
  36                 "warning: Please adjust your scripts and environment.\n");
  37         for (i = 0; i < sizeof(bc_name) / sizeof(bc_name[0]); i++) {
  38                 /* warning is needed only when old name is there and
  39                  * new name is not.
  40                  */
  41                 if (!getenv(bc_name[i].canonical) && getenv(bc_name[i].old))
  42                         fprintf(stderr, "warning: old %s => new %s\n",
  43                                 bc_name[i].old, bc_name[i].canonical);
  44         }
  45 }
  46
  47 char *gitenv_bc(const char *e)
  48 {
  49         int first, last;
  50         char *val = getenv(e);
  51         if (val)
  52                 die("gitenv_bc called on existing %s; fix the caller.", e);
  53
  54         first = 0;
  55         last = sizeof(bc_name) / sizeof(bc_name[0]);
  56         while (last > first) {
  57                 int next = (last + first) >> 1;
  58                 int cmp = strcmp(e, bc_name[next].canonical);
  59                 if (!cmp) {
  60                         val = getenv(bc_name[next].old);
  61                         /* If the user has only old name, warn.
  62                          * otherwise stay silent.
  63                          */
  64                         if (val)
  65                                 warn_old_environment(next);
  66                         return val;
  67                 }
  68                 if (cmp < 0) {
  69                         last = next;
  70                         continue;
  71                 }
  72                 first = next+1;
  73         }
  74         return NULL;
  75 }