LCOV - code coverage report
Current view: top level - src/fe_utils - version.c (source / functions) Coverage Total Hit
Test: PostgreSQL 20devel Lines: 75.0 % 20 15
Test Date: 2026-07-16 06:15:47 Functions: 100.0 % 1 1
Legend: Lines:     hit not hit
Branches: + taken - not taken # not executed
Branches: 57.1 % 14 8

             Branch data     Line data    Source code
       1                 :             : /*-------------------------------------------------------------------------
       2                 :             :  *
       3                 :             :  * version.c
       4                 :             :  *      Routine to retrieve information of PG_VERSION
       5                 :             :  *
       6                 :             :  * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
       7                 :             :  * Portions Copyright (c) 1994, Regents of the University of California
       8                 :             :  *
       9                 :             :  *
      10                 :             :  * IDENTIFICATION
      11                 :             :  *    src/fe_utils/version.c
      12                 :             :  *
      13                 :             :  *-------------------------------------------------------------------------
      14                 :             :  */
      15                 :             : 
      16                 :             : #include "postgres_fe.h"
      17                 :             : 
      18                 :             : #include <sys/stat.h>
      19                 :             : 
      20                 :             : #include "common/logging.h"
      21                 :             : #include "fe_utils/version.h"
      22                 :             : 
      23                 :             : /*
      24                 :             :  * Assumed maximum size of PG_VERSION.  This should be more than enough for
      25                 :             :  * any version numbers that need to be handled.
      26                 :             :  */
      27                 :             : #define PG_VERSION_MAX_SIZE 64
      28                 :             : 
      29                 :             : /*
      30                 :             :  * get_pg_version
      31                 :             :  *
      32                 :             :  * Retrieve the major version number of the given data folder, from
      33                 :             :  * PG_VERSION.  The result returned is a version number, that can be used
      34                 :             :  * for comparisons based on PG_VERSION_NUM.  For example, if PG_VERSION
      35                 :             :  * contains "18\n", this function returns 180000.
      36                 :             :  *
      37                 :             :  * This supports both the pre-v10 and the post-v10 version numbering.
      38                 :             :  *
      39                 :             :  * Optionally, "version_str" can be specified to store the contents
      40                 :             :  * retrieved from PG_VERSION.  It is allocated by this routine; the
      41                 :             :  * caller is responsible for pg_free()-ing it.
      42                 :             :  */
      43                 :             : uint32
      44                 :         224 : get_pg_version(const char *datadir, char **version_str)
      45                 :             : {
      46                 :             :     FILE       *version_fd;
      47                 :             :     char        ver_filename[MAXPGPATH];
      48                 :             :     char        buf[PG_VERSION_MAX_SIZE];
      49                 :         224 :     int         v1 = 0,
      50                 :         224 :                 v2 = 0;
      51                 :             :     struct stat st;
      52                 :             : 
      53                 :         224 :     snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
      54                 :             :              datadir);
      55                 :             : 
      56         [ -  + ]:         224 :     if ((version_fd = fopen(ver_filename, "r")) == NULL)
      57                 :           0 :         pg_fatal("could not open version file \"%s\": %m", ver_filename);
      58                 :             : 
      59         [ -  + ]:         224 :     if (fstat(fileno(version_fd), &st) != 0)
      60                 :           0 :         pg_fatal("could not stat file \"%s\": %m", ver_filename);
      61         [ -  + ]:         224 :     if (st.st_size > PG_VERSION_MAX_SIZE)
      62                 :           0 :         pg_fatal("file \"%s\" is too large", ver_filename);
      63                 :             : 
      64         [ +  - ]:         224 :     if (fscanf(version_fd, "%63s", buf) == 0 ||
      65         [ -  + ]:         224 :         sscanf(buf, "%d.%d", &v1, &v2) < 1)
      66                 :           0 :         pg_fatal("could not parse version file \"%s\"", ver_filename);
      67                 :             : 
      68                 :         224 :     fclose(version_fd);
      69                 :             : 
      70         [ +  + ]:         224 :     if (version_str)
      71                 :             :     {
      72                 :         202 :         *version_str = pg_malloc(PG_VERSION_MAX_SIZE);
      73                 :         202 :         memcpy(*version_str, buf, st.st_size);
      74                 :             :     }
      75                 :             : 
      76         [ -  + ]:         224 :     if (v1 < 10)
      77                 :             :     {
      78                 :             :         /* pre-v10 style, e.g. 9.6.1 */
      79                 :           0 :         return v1 * 10000 + v2 * 100;
      80                 :             :     }
      81                 :             :     else
      82                 :             :     {
      83                 :             :         /* post-v10 style, e.g. 10.1 */
      84                 :         224 :         return v1 * 10000;
      85                 :             :     }
      86                 :             : }
        

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