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get_pg_version() is able to return a version number, that can be used for comparisons based on PG_VERSION_NUM. A macro is added to convert the result to a major version number, to work with PG_MAJORVERSION_NUM. It is possible to pass to the routine an optional argument, where the contents retrieved from PG_VERSION are saved. This requirement matters for some of the frontend code (one example: pg_upgrade wants that for tablespace paths with a version number strictly older than v10). This will be used by a set of follow-up patches, to be consumed in various frontend tools that duplicate a logic similar to do what this new routine does, like: - pg_resetwal - pg_combinebackup - pg_createsubscriber - pg_upgrade This routine supports both the post-v10 version number and the older flavor (aka 9.6), as required at least by pg_upgrade. Author: Michael Paquier <michael@paquier.xyz> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Discussion: https://postgr.es/m/aOiirvWJzwdVCXph@paquier.xyz
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* version.c
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* Routine to retrieve information of PG_VERSION
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*
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* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/fe_utils/version.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include <sys/stat.h>
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#include "common/logging.h"
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#include "fe_utils/version.h"
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/*
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* Assumed maximum size of PG_VERSION. This should be more than enough for
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* any version numbers that need to be handled.
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*/
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#define PG_VERSION_MAX_SIZE 64
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/*
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* get_pg_version
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*
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* Retrieve the major version number of the given data folder, from
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* PG_VERSION. The result returned is a version number, that can be used
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* for comparisons based on PG_VERSION_NUM. For example, if PG_VERSION
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* contains "18\n", this function returns 180000.
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*
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* This supports both the pre-v10 and the post-v10 version numbering.
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*
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* Optionally, "version_str" can be specified to store the contents
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* retrieved from PG_VERSION. It is allocated by this routine; the
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* caller is responsible for pg_free()-ing it.
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*/
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uint32
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get_pg_version(const char *datadir, char **version_str)
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{
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FILE *version_fd;
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char ver_filename[MAXPGPATH];
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char buf[PG_VERSION_MAX_SIZE];
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int v1 = 0,
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v2 = 0;
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struct stat st;
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snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
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datadir);
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if ((version_fd = fopen(ver_filename, "r")) == NULL)
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pg_fatal("could not open version file \"%s\": %m", ver_filename);
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if (fstat(fileno(version_fd), &st) != 0)
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pg_fatal("could not stat file \"%s\": %m", ver_filename);
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if (st.st_size > PG_VERSION_MAX_SIZE)
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pg_fatal("file \"%s\" is too large", ver_filename);
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if (fscanf(version_fd, "%63s", buf) == 0 ||
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sscanf(buf, "%d.%d", &v1, &v2) < 1)
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pg_fatal("could not parse version file \"%s\"", ver_filename);
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fclose(version_fd);
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if (version_str)
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{
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*version_str = pg_malloc(PG_VERSION_MAX_SIZE);
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memcpy(*version_str, buf, st.st_size);
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}
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if (v1 < 10)
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{
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/* pre-v10 style, e.g. 9.6.1 */
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return v1 * 10000 + v2 * 100;
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}
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else
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{
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/* post-v10 style, e.g. 10.1 */
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return v1 * 10000;
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}
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}
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