pkgs/development/libraries/glibc/nix-nss-open-files.patch

   1 diff --git a/nss/nss_files/files-XXX.c b/nss/nss_files/files-XXX.c
   2 index 1db9e46127..3a567e0224 100644
   3 --- a/nss/nss_files/files-XXX.c
   4 +++ b/nss/nss_files/files-XXX.c
   5 @@ -75,8 +75,20 @@ internal_setent (FILE **stream)
   6
   7    if (*stream == NULL)
   8      {
   9 -      *stream = __nss_files_fopen (DATAFILE);
  10 -
  11 +      const char *file = DATAFILE;
  12 +
  13 +      #ifdef NIX_DATAFILE
  14 +      // use the Nix environment variable such as `NIX_ETC_PROTOCOLS`
  15 +      char *path = secure_getenv (NIX_DATAFILE);
  16 +
  17 +      // if the environment variable is set, then read from the /nix/store entry instead
  18 +      if (path && path[0]) {
  19 +        file = path;
  20 +      }
  21 +      #endif
  22 +
  23 +      *stream = __nss_files_fopen (file);
  24 +
  25        if (*stream == NULL)
  26         status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
  27      }
  28 diff --git a/nss/nss_files/files-proto.c b/nss/nss_files/files-proto.c
  29 index c30bedc0aa..b321e68d3c 100644
  30 --- a/nss/nss_files/files-proto.c
  31 +++ b/nss/nss_files/files-proto.c
  32 @@ -23,6 +23,7 @@ NSS_DECLARE_MODULE_FUNCTIONS (files)
  33
  34  #define ENTNAME                protoent
  35  #define DATABASE       "protocols"
  36 +#define NIX_DATAFILE "NIX_ETC_PROTOCOLS"
  37
  38  struct protoent_data {};
  39
  40 diff --git a/nss/nss_files/files-service.c b/nss/nss_files/files-service.c
  41 index bfc2590699..0bff36aee5 100644
  42 --- a/nss/nss_files/files-service.c
  43 +++ b/nss/nss_files/files-service.c
  44 @@ -24,6 +24,7 @@ NSS_DECLARE_MODULE_FUNCTIONS (files)
  45
  46  #define ENTNAME                servent
  47  #define DATABASE       "services"
  48 +#define NIX_DATAFILE "NIX_ETC_SERVICES"
  49
  50  struct servent_data {};
  51