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/*-------------------------------------------------------------------------
*
* shell_archive.c
*
* This archiving function uses a user-specified shell command (the
* archive_command GUC) to copy write-ahead log files. It is used as the
* default, but other modules may define their own custom archiving logic.
*
* Copyright (c) 2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/postmaster/shell_archive.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/wait.h>
#include "access/xlog.h"
#include "pgstat.h"
#include "postmaster/pgarch.h"
static bool shell_archive_configured(void);
static bool shell_archive_file(const char *file, const char *path);
static void shell_archive_shutdown(void);
void
shell_archive_init(ArchiveModuleCallbacks *cb)
{
AssertVariableIsOfType(&shell_archive_init, ArchiveModuleInit);
cb->check_configured_cb = shell_archive_configured;
cb->archive_file_cb = shell_archive_file;
cb->shutdown_cb = shell_archive_shutdown;
}
static bool
shell_archive_configured(void)
{
return XLogArchiveCommand[0] != '\0';
}
static bool
shell_archive_file(const char *file, const char *path)
{
char xlogarchcmd[MAXPGPATH];
char *dp;
char *endp;
const char *sp;
int rc;
/*
* construct the command to be executed
*/
dp = xlogarchcmd;
endp = xlogarchcmd + MAXPGPATH - 1;
*endp = '\0';
for (sp = XLogArchiveCommand; *sp; sp++)
{
if (*sp == '%')
{
switch (sp[1])
{
case 'p':
/* %p: relative path of source file */
sp++;
strlcpy(dp, path, endp - dp);
make_native_path(dp);
dp += strlen(dp);
break;
case 'f':
/* %f: filename of source file */
sp++;
strlcpy(dp, file, endp - dp);
dp += strlen(dp);
break;
case '%':
/* convert %% to a single % */
sp++;
if (dp < endp)
*dp++ = *sp;
break;
default:
/* otherwise treat the % as not special */
if (dp < endp)
*dp++ = *sp;
break;
}
}
else
{
if (dp < endp)
*dp++ = *sp;
}
}
*dp = '\0';
ereport(DEBUG3,
(errmsg_internal("executing archive command \"%s\"",
xlogarchcmd)));
pgstat_report_wait_start(WAIT_EVENT_ARCHIVE_COMMAND);
rc = system(xlogarchcmd);
pgstat_report_wait_end();
if (rc != 0)
{
/*
* If either the shell itself, or a called command, died on a signal,
* abort the archiver. We do this because system() ignores SIGINT and
* SIGQUIT while waiting; so a signal is very likely something that
* should have interrupted us too. Also die if the shell got a hard
* "command not found" type of error. If we overreact it's no big
* deal, the postmaster will just start the archiver again.
*/
int lev = wait_result_is_any_signal(rc, true) ? FATAL : LOG;
if (WIFEXITED(rc))
{
ereport(lev,
(errmsg("archive command failed with exit code %d",
WEXITSTATUS(rc)),
errdetail("The failed archive command was: %s",
xlogarchcmd)));
}
else if (WIFSIGNALED(rc))
{
#if defined(WIN32)
ereport(lev,
(errmsg("archive command was terminated by exception 0x%X",
WTERMSIG(rc)),
errhint("See C include file \"ntstatus.h\" for a description of the hexadecimal value."),
errdetail("The failed archive command was: %s",
xlogarchcmd)));
#else
ereport(lev,
(errmsg("archive command was terminated by signal %d: %s",
WTERMSIG(rc), pg_strsignal(WTERMSIG(rc))),
errdetail("The failed archive command was: %s",
xlogarchcmd)));
#endif
}
else
{
ereport(lev,
(errmsg("archive command exited with unrecognized status %d",
rc),
errdetail("The failed archive command was: %s",
xlogarchcmd)));
}
return false;
}
elog(DEBUG1, "archived write-ahead log file \"%s\"", file);
return true;
}
static void
shell_archive_shutdown(void)
{
elog(DEBUG1, "archiver process shutting down");
}
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