chore: change nix script to modify logs with env var

Also change logging level of curl

Author: steve-chavez

docs/contributing.md

@@ -25,11 +25,7 @@ $ net-with-pg-13 python -m pytest -vv"
 You can turn on logging level to see curl traces with
 
 ```
-$ export LOGMIN=DEBUG1 # must be done outside nix-shell, then go in nix-shell as usual
-
-$ nix-shell
-
-$ net-with-pg-12 psql
+$ LOG_MIN_MESSAGES=debug2 net-with-pg-12 psql
 ```
 
 ```sql

nix/pgScript.nix

@@ -1,8 +1,6 @@
 { postgresql, writeShellScriptBin } :
 
 let
-  LOGMIN = builtins.getEnv "LOGMIN";
-  logMin = if builtins.stringLength LOGMIN == 0 then "INFO" else LOGMIN;
   ver = builtins.head (builtins.splitVersion postgresql.version);
   script = ''
     set -euo pipefail
@@ -20,7 +18,7 @@ let
 
     PGTZ=UTC initdb --no-locale --encoding=UTF8 --nosync -U "$PGUSER"
 
-    options="-F -c listen_addresses=\"\" -c log_min_messages=${logMin} -k $PGDATA"
+    options="-F -c listen_addresses=\"\" -c log_min_messages=\"''${LOG_MIN_MESSAGES:-INFO}\" -k $PGDATA"
 
     ext_options="-c shared_preload_libraries=\"pg_net\""
 

src/worker.c

@@ -193,7 +193,7 @@ static void init_curl_handle(CURLM *curl_mhandle, CurlData *cdata, char *url, ch
   CURL_EZ_SETOPT(curl_ez_handle, CURLOPT_TIMEOUT_MS, timeout_milliseconds);
   CURL_EZ_SETOPT(curl_ez_handle, CURLOPT_PRIVATE, cdata);
   CURL_EZ_SETOPT(curl_ez_handle, CURLOPT_FOLLOWLOCATION, true);
-  if (log_min_messages <= DEBUG1)
+  if (log_min_messages <= DEBUG2)
     CURL_EZ_SETOPT(curl_ez_handle, CURLOPT_VERBOSE, 1L);
 #if LIBCURL_VERSION_NUM >= 0x075500 /* libcurl 7.85.0 */
   CURL_EZ_SETOPT(curl_ez_handle, CURLOPT_PROTOCOLS_STR, "http,https");