pg_upgrade.h

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/*
 *  pg_upgrade.h
 *
 *  Copyright (c) 2010-2018, PostgreSQL Global Development Group
 *  src/bin/pg_upgrade/pg_upgrade.h
 */

#include <unistd.h>
#include <assert.h>
#include <sys/stat.h>
#include <sys/time.h>

#include "libpq-fe.h"

/* Use port in the private/dynamic port number range */
#define DEF_PGUPORT         50432

/* Allocate for null byte */
#define USER_NAME_SIZE      128

#define MAX_STRING          1024
#define LINE_ALLOC          4096
#define QUERY_ALLOC         8192

#define MIGRATOR_API_VERSION    1

#define MESSAGE_WIDTH       60

#define GET_MAJOR_VERSION(v)    ((v) / 100)

/* contains both global db information and CREATE DATABASE commands */
#define GLOBALS_DUMP_FILE   "pg_upgrade_dump_globals.sql"
#define DB_DUMP_FILE_MASK   "pg_upgrade_dump_%u.custom"

#define DB_DUMP_LOG_FILE_MASK   "pg_upgrade_dump_%u.log"
#define SERVER_LOG_FILE     "pg_upgrade_server.log"
#define UTILITY_LOG_FILE    "pg_upgrade_utility.log"
#define INTERNAL_LOG_FILE   "pg_upgrade_internal.log"

extern char *output_files[];

/*
 * WIN32 files do not accept writes from multiple processes
 *
 * On Win32, we can't send both pg_upgrade output and command output to the
 * same file because we get the error: "The process cannot access the file
 * because it is being used by another process." so send the pg_ctl
 * command-line output to a new file, rather than into the server log file.
 * Ideally we could use UTILITY_LOG_FILE for this, but some Windows platforms
 * keep the pg_ctl output file open by the running postmaster, even after
 * pg_ctl exits.
 *
 * We could use the Windows pgwin32_open() flags to allow shared file
 * writes but is unclear how all other tools would use those flags, so
 * we just avoid it and log a little differently on Windows;  we adjust
 * the error message appropriately.
 */
#ifndef WIN32
#define SERVER_START_LOG_FILE   SERVER_LOG_FILE
#define SERVER_STOP_LOG_FILE    SERVER_LOG_FILE
#else
#define SERVER_START_LOG_FILE   "pg_upgrade_server_start.log"
/*
 *  "pg_ctl start" keeps SERVER_START_LOG_FILE and SERVER_LOG_FILE open
 *  while the server is running, so we use UTILITY_LOG_FILE for "pg_ctl
 *  stop".
 */
#define SERVER_STOP_LOG_FILE    UTILITY_LOG_FILE
#endif


#ifndef WIN32
#define pg_mv_file          rename
#define pg_link_file        link
#define PATH_SEPARATOR      '/'
#define PATH_QUOTE  '\''
#define RM_CMD              "rm -f"
#define RMDIR_CMD           "rm -rf"
#define SCRIPT_PREFIX       "./"
#define SCRIPT_EXT          "sh"
#define ECHO_QUOTE  "'"
#define ECHO_BLANK  ""
#else
#define pg_mv_file          pgrename
#define pg_link_file        win32_pghardlink
#define PATH_SEPARATOR      '\\'
#define PATH_QUOTE  '"'
#define RM_CMD              "DEL /q"
#define RMDIR_CMD           "RMDIR /s/q"
#define SCRIPT_PREFIX       ""
#define SCRIPT_EXT          "bat"
#define EXE_EXT             ".exe"
#define ECHO_QUOTE  ""
#define ECHO_BLANK  "."
#endif


/*
 * postmaster/postgres -b (binary_upgrade) flag added during PG 9.1
 * development
 */
#define BINARY_UPGRADE_SERVER_FLAG_CAT_VER 201104251

/*
 *  Visibility map changed with this 9.2 commit,
 *  8f9fe6edce358f7904e0db119416b4d1080a83aa; pick later catalog version.
 */
#define VISIBILITY_MAP_CRASHSAFE_CAT_VER 201107031

/*
 * The format of visibility map is changed with this 9.6 commit,
 */
#define VISIBILITY_MAP_FROZEN_BIT_CAT_VER 201603011

/*
 * pg_multixact format changed in 9.3 commit 0ac5ad5134f2769ccbaefec73844f85,
 * ("Improve concurrency of foreign key locking") which also updated catalog
 * version to this value.  pg_upgrade behavior depends on whether old and new
 * server versions are both newer than this, or only the new one is.
 */
#define MULTIXACT_FORMATCHANGE_CAT_VER 201301231

/*
 * large object chunk size added to pg_controldata,
 * commit 5f93c37805e7485488480916b4585e098d3cc883
 */
#define LARGE_OBJECT_SIZE_PG_CONTROL_VER 942

/*
 * change in JSONB format during 9.4 beta
 */
#define JSONB_FORMAT_CHANGE_CAT_VER 201409291


/*
 * Each relation is represented by a relinfo structure.
 */
typedef struct
{
    /* Can't use NAMEDATALEN; not guaranteed to be same on client */
    char       *nspname;        /* namespace name */
    char       *relname;        /* relation name */
    Oid         reloid;         /* relation OID */
    Oid         relfilenode;    /* relation relfile node */
    Oid         indtable;       /* if index, OID of its table, else 0 */
    Oid         toastheap;      /* if toast table, OID of base table, else 0 */
    char       *tablespace;     /* tablespace path; "" for cluster default */
    bool        nsp_alloc;      /* should nspname be freed? */
    bool        tblsp_alloc;    /* should tablespace be freed? */
} RelInfo;

typedef struct
{
    RelInfo    *rels;
    int         nrels;
} RelInfoArr;

/*
 * The following structure represents a relation mapping.
 */
typedef struct
{
    const char *old_tablespace;
    const char *new_tablespace;
    const char *old_tablespace_suffix;
    const char *new_tablespace_suffix;
    Oid         old_db_oid;
    Oid         new_db_oid;

    /*
     * old/new relfilenodes might differ for pg_largeobject(_metadata) indexes
     * due to VACUUM FULL or REINDEX.  Other relfilenodes are preserved.
     */
    Oid         old_relfilenode;
    Oid         new_relfilenode;
    /* the rest are used only for logging and error reporting */
    char       *nspname;        /* namespaces */
    char       *relname;
} FileNameMap;

/*
 * Structure to store database information
 */
typedef struct
{
    Oid         db_oid;         /* oid of the database */
    char       *db_name;        /* database name */
    char        db_tablespace[MAXPGPATH];   /* database default tablespace
                                             * path */
    char       *db_collate;
    char       *db_ctype;
    int         db_encoding;
    RelInfoArr  rel_arr;        /* array of all user relinfos */
} DbInfo;

typedef struct
{
    DbInfo     *dbs;            /* array of db infos */
    int         ndbs;           /* number of db infos */
} DbInfoArr;

/*
 * The following structure is used to hold pg_control information.
 * Rather than using the backend's control structure we use our own
 * structure to avoid pg_control version issues between releases.
 */
typedef struct
{
    uint32      ctrl_ver;
    uint32      cat_ver;
    char        nextxlogfile[25];
    uint32      chkpnt_nxtxid;
    uint32      chkpnt_nxtepoch;
    uint32      chkpnt_nxtoid;
    uint32      chkpnt_nxtmulti;
    uint32      chkpnt_nxtmxoff;
    uint32      chkpnt_oldstMulti;
    uint32      align;
    uint32      blocksz;
    uint32      largesz;
    uint32      walsz;
    uint32      walseg;
    uint32      ident;
    uint32      index;
    uint32      toast;
    uint32      large_object;
    bool        date_is_int;
    bool        float8_pass_by_value;
    bool        data_checksum_version;
} ControlData;

/*
 * Enumeration to denote link modes
 */
typedef enum
{
    TRANSFER_MODE_COPY,
    TRANSFER_MODE_LINK
} transferMode;

/*
 * Enumeration to denote pg_log modes
 */
typedef enum
{
    PG_VERBOSE,
    PG_STATUS,
    PG_REPORT,
    PG_WARNING,
    PG_FATAL
} eLogType;


typedef long pgpid_t;


/*
 * cluster
 *
 *  information about each cluster
 */
typedef struct
{
    ControlData controldata;    /* pg_control information */
    DbInfoArr   dbarr;          /* dbinfos array */
    char       *pgdata;         /* pathname for cluster's $PGDATA directory */
    char       *pgconfig;       /* pathname for cluster's config file
                                 * directory */
    char       *bindir;         /* pathname for cluster's executable directory */
    char       *pgopts;         /* options to pass to the server, like pg_ctl
                                 * -o */
    char       *sockdir;        /* directory for Unix Domain socket, if any */
    unsigned short port;        /* port number where postmaster is waiting */
    uint32      major_version;  /* PG_VERSION of cluster */
    char        major_version_str[64];  /* string PG_VERSION of cluster */
    uint32      bin_version;    /* version returned from pg_ctl */
    const char *tablespace_suffix;  /* directory specification */
} ClusterInfo;


/*
 *  LogOpts
*/
typedef struct
{
    FILE       *internal;       /* internal log FILE */
    bool        verbose;        /* true -> be verbose in messages */
    bool        retain;         /* retain log files on success */
} LogOpts;


/*
 *  UserOpts
*/
typedef struct
{
    bool        check;          /* true -> ask user for permission to make
                                 * changes */
    transferMode transfer_mode; /* copy files or link them? */
    int         jobs;
} UserOpts;


/*
 * OSInfo
 */
typedef struct
{
    const char *progname;       /* complete pathname for this program */
    char       *exec_path;      /* full path to my executable */
    char       *user;           /* username for clusters */
    bool        user_specified; /* user specified on command-line */
    char      **old_tablespaces;    /* tablespaces */
    int         num_old_tablespaces;
    char      **libraries;      /* loadable libraries */
    int         num_libraries;
    ClusterInfo *running_cluster;
} OSInfo;


/*
 * Global variables
 */
extern LogOpts log_opts;
extern UserOpts user_opts;
extern ClusterInfo old_cluster,
            new_cluster;
extern OSInfo os_info;


/* check.c */

void        output_check_banner(bool live_check);
void        check_and_dump_old_cluster(bool live_check);
void        check_new_cluster(void);
void        report_clusters_compatible(void);
void        issue_warnings_and_set_wal_level(void);
void output_completion_banner(char *analyze_script_file_name,
                         char *deletion_script_file_name);
void        check_cluster_versions(void);
void        check_cluster_compatibility(bool live_check);
void        create_script_for_old_cluster_deletion(char **deletion_script_file_name);
void        create_script_for_cluster_analyze(char **analyze_script_file_name);


/* controldata.c */

void        get_control_data(ClusterInfo *cluster, bool live_check);
void        check_control_data(ControlData *oldctrl, ControlData *newctrl);
void        disable_old_cluster(void);


/* dump.c */

void        generate_old_dump(void);


/* exec.c */

#define EXEC_PSQL_ARGS "--echo-queries --set ON_ERROR_STOP=on --no-psqlrc --dbname=template1"

bool exec_prog(const char *log_file, const char *opt_log_file,
          bool report_error, bool exit_on_error, const char *fmt,...) pg_attribute_printf(5, 6);
void        verify_directories(void);
bool        pid_lock_file_exists(const char *datadir);


/* file.c */

void copyFile(const char *src, const char *dst,
         const char *schemaName, const char *relName);
void linkFile(const char *src, const char *dst,
         const char *schemaName, const char *relName);
void rewriteVisibilityMap(const char *fromfile, const char *tofile,
                     const char *schemaName, const char *relName);
void        check_hard_link(void);

/* fopen_priv() is no longer different from fopen() */
#define fopen_priv(path, mode)  fopen(path, mode)

/* function.c */

void        get_loadable_libraries(void);
void        check_loadable_libraries(void);

/* info.c */

FileNameMap *gen_db_file_maps(DbInfo *old_db,
                 DbInfo *new_db, int *nmaps, const char *old_pgdata,
                 const char *new_pgdata);
void        get_db_and_rel_infos(ClusterInfo *cluster);
void print_maps(FileNameMap *maps, int n,
           const char *db_name);

/* option.c */

void        parseCommandLine(int argc, char *argv[]);
void        adjust_data_dir(ClusterInfo *cluster);
void        get_sock_dir(ClusterInfo *cluster, bool live_check);

/* relfilenode.c */

void transfer_all_new_tablespaces(DbInfoArr *old_db_arr,
                             DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata);
void transfer_all_new_dbs(DbInfoArr *old_db_arr,
                     DbInfoArr *new_db_arr, char *old_pgdata, char *new_pgdata,
                     char *old_tablespace);

/* tablespace.c */

void        init_tablespaces(void);


/* server.c */

PGconn     *connectToServer(ClusterInfo *cluster, const char *db_name);
PGresult   *executeQueryOrDie(PGconn *conn, const char *fmt,...) pg_attribute_printf(2, 3);

char       *cluster_conn_opts(ClusterInfo *cluster);

bool        start_postmaster(ClusterInfo *cluster, bool report_and_exit_on_error);
void        stop_postmaster(bool in_atexit);
uint32      get_major_server_version(ClusterInfo *cluster);
void        check_pghost_envvar(void);


/* util.c */

char       *quote_identifier(const char *s);
int         get_user_info(char **user_name_p);
void        check_ok(void);
void        report_status(eLogType type, const char *fmt,...) pg_attribute_printf(2, 3);
void        pg_log(eLogType type, const char *fmt,...) pg_attribute_printf(2, 3);
void        pg_fatal(const char *fmt,...) pg_attribute_printf(1, 2) pg_attribute_noreturn();
void        end_progress_output(void);
void        prep_status(const char *fmt,...) pg_attribute_printf(1, 2);
void        check_ok(void);
unsigned int str2uint(const char *str);
void        pg_putenv(const char *var, const char *val);


/* version.c */

void new_9_0_populate_pg_largeobject_metadata(ClusterInfo *cluster,
                                         bool check_mode);
void        old_9_3_check_for_line_data_type_usage(ClusterInfo *cluster);
void        old_9_6_check_for_unknown_data_type_usage(ClusterInfo *cluster);
void old_9_6_invalidate_hash_indexes(ClusterInfo *cluster,
                                bool check_mode);

/* parallel.c */
void parallel_exec_prog(const char *log_file, const char *opt_log_file,
                   const char *fmt,...) pg_attribute_printf(3, 4);
void parallel_transfer_all_new_dbs(DbInfoArr *old_db_arr, DbInfoArr *new_db_arr,
                              char *old_pgdata, char *new_pgdata,
                              char *old_tablespace);
bool        reap_child(bool wait_for_child);