Andrew's git - gitweb.git/blob

   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 */
  10static 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
  23static 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
  47char *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}