141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*-------------------------------------------------------------------------
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*
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* shell_archive.c
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*
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* This archiving function uses a user-specified shell command (the
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* archive_command GUC) to copy write-ahead log files. It is used as the
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* default, but other modules may define their own custom archiving logic.
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*
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* Copyright (c) 2022-2024, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/backend/archive/shell_archive.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <sys/wait.h>
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#include "access/xlog.h"
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#include "archive/archive_module.h"
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#include "archive/shell_archive.h"
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#include "common/percentrepl.h"
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#include "pgstat.h"
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static bool shell_archive_configured(ArchiveModuleState *state);
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static bool shell_archive_file(ArchiveModuleState *state,
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const char *file,
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const char *path);
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static void shell_archive_shutdown(ArchiveModuleState *state);
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static const ArchiveModuleCallbacks shell_archive_callbacks = {
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.startup_cb = NULL,
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.check_configured_cb = shell_archive_configured,
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.archive_file_cb = shell_archive_file,
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.shutdown_cb = shell_archive_shutdown
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};
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const ArchiveModuleCallbacks *
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shell_archive_init(void)
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{
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return &shell_archive_callbacks;
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}
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static bool
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shell_archive_configured(ArchiveModuleState *state)
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{
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if (XLogArchiveCommand[0] != '\0')
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return true;
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arch_module_check_errdetail("%s is not set.",
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"archive_command");
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return false;
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}
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static bool
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shell_archive_file(ArchiveModuleState *state, const char *file,
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const char *path)
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{
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char *xlogarchcmd;
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char *nativePath = NULL;
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int rc;
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if (path)
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{
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nativePath = pstrdup(path);
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make_native_path(nativePath);
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}
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xlogarchcmd = replace_percent_placeholders(XLogArchiveCommand,
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"archive_command", "fp",
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file, nativePath);
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ereport(DEBUG3,
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(errmsg_internal("executing archive command \"%s\"",
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xlogarchcmd)));
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fflush(NULL);
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pgstat_report_wait_start(WAIT_EVENT_ARCHIVE_COMMAND);
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rc = system(xlogarchcmd);
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pgstat_report_wait_end();
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if (rc != 0)
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{
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/*
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* If either the shell itself, or a called command, died on a signal,
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* abort the archiver. We do this because system() ignores SIGINT and
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* SIGQUIT while waiting; so a signal is very likely something that
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* should have interrupted us too. Also die if the shell got a hard
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* "command not found" type of error. If we overreact it's no big
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* deal, the postmaster will just start the archiver again.
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*/
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int lev = wait_result_is_any_signal(rc, true) ? FATAL : LOG;
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if (WIFEXITED(rc))
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{
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ereport(lev,
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(errmsg("archive command failed with exit code %d",
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WEXITSTATUS(rc)),
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errdetail("The failed archive command was: %s",
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xlogarchcmd)));
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}
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else if (WIFSIGNALED(rc))
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{
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#if defined(WIN32)
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ereport(lev,
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(errmsg("archive command was terminated by exception 0x%X",
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WTERMSIG(rc)),
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errhint("See C include file \"ntstatus.h\" for a description of the hexadecimal value."),
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errdetail("The failed archive command was: %s",
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xlogarchcmd)));
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#else
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ereport(lev,
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(errmsg("archive command was terminated by signal %d: %s",
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WTERMSIG(rc), pg_strsignal(WTERMSIG(rc))),
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errdetail("The failed archive command was: %s",
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xlogarchcmd)));
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#endif
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}
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else
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{
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ereport(lev,
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(errmsg("archive command exited with unrecognized status %d",
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rc),
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errdetail("The failed archive command was: %s",
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xlogarchcmd)));
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}
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return false;
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}
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elog(DEBUG1, "archived write-ahead log file \"%s\"", file);
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return true;
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}
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static void
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shell_archive_shutdown(ArchiveModuleState *state)
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{
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elog(DEBUG1, "archiver process shutting down");
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}
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