PostgreSQL 17 support. (#81)

The only change that breaks compatibility for PostgreSQL 17 is the InitializeSessionUserId() function signature change: postgres/postgres@e768919

Also add 17beta2 to the test matrix.

Reviewed by David Steele (@dwsteele).

.github/workflows/regression-tests.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        pgver: [12, 13, 14, 15, 16]
+        pgver: [12, 13, 14, 15, 16, 17beta2]
 
     steps:
       - name: Checkout set_user repo
@@ -30,7 +30,9 @@ jobs:
       - name: Set DEVPKG to pgver if unset
         if: ${{ env.DEVPKG == '' }}
         run: |
-          echo "DEVPKG=${{ matrix.pgver }}" >> $GITHUB_ENV;
+          # Cut off label and leave only major version number (17beta2 -> 17)
+          DEVPKG=$(echo ${{ matrix.pgver }} | sed 's/^\([0-9]\{2\}\).*/\1/')
+          echo "DEVPKG=$DEVPKG" >> $GITHUB_ENV;
 
       - name: Build set_user
         run: |

src/compatibility.h

@@ -16,6 +16,20 @@
 #define NO_ASSERT_AUTH_UID_ONCE !USE_ASSERT_CHECKING
 #endif
 
+/*
+ * PostgreSQL version 17+
+ *
+ * - Sets bypass_login_check parameter to false in InitializeSessionUserId funcion
+ */
+#if PG_VERSION_NUM >= 170000
+
+#ifndef INITSESSIONUSER
+#define INITSESSIONUSER
+#define _InitializeSessionUserId(name,ouserid) InitializeSessionUserId(name,ouserid,false)
+#endif
+
+#endif /* 17+ */
+
 /*
  * PostgreSQL version 14+
  *
@@ -135,8 +149,10 @@ _heap_tuple_get_oid(HeapTuple tuple, Oid catalogID)
 #if PG_VERSION_NUM >= 90500
 #define GETUSERNAMEFROMID(ouserid) GetUserNameFromId(ouserid, false)
 
+#ifndef INITSESSIONUSER
 #define INITSESSIONUSER
 #define _InitializeSessionUserId(name,ouserid) InitializeSessionUserId(name,ouserid)
+#endif
 
 #endif /* 9.5+ */