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port.c
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port.c
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/*
* pg_checksums_ext
*
* Verifies/enables/disables data checksums
*
* Copyright (c) 2010-2024, PostgreSQL Global Development Group
*
* port.c
*/
#include "postgres_fe.h"
#include "port.h"
#include <dirent.h>
#include <sys/stat.h>
/*
* Update the control file.
*/
void
updateControlFile(char *DataDir, ControlFileData *ControlFile, bool do_sync)
{
int fd;
char buffer[PG_CONTROL_FILE_SIZE];
char ControlFilePath[MAXPGPATH];
/*
* For good luck, apply the same static assertions as in backend's
* WriteControlFile().
*/
StaticAssertStmt(sizeof(ControlFileData) <= PG_CONTROL_MAX_SAFE_SIZE,
"pg_control is too large for atomic disk writes");
StaticAssertStmt(sizeof(ControlFileData) <= PG_CONTROL_FILE_SIZE,
"sizeof(ControlFileData) exceeds PG_CONTROL_FILE_SIZE");
/* Recalculate CRC of control file */
INIT_CRC32C(ControlFile->crc);
COMP_CRC32C(ControlFile->crc,
(char *) ControlFile,
offsetof(ControlFileData, crc));
FIN_CRC32C(ControlFile->crc);
/*
* Write out PG_CONTROL_FILE_SIZE bytes into pg_control by zero-padding
* the excess over sizeof(ControlFileData), to avoid premature EOF related
* errors when reading it.
*/
memset(buffer, 0, PG_CONTROL_FILE_SIZE);
memcpy(buffer, ControlFile, sizeof(ControlFileData));
snprintf(ControlFilePath, sizeof(ControlFilePath), "%s/%s", DataDir, XLOG_CONTROL_FILE);
fd = open(ControlFilePath, O_WRONLY | PG_BINARY,
pg_file_create_mode);
if (fd < 0)
{
fprintf(stderr, _("%s: could not create pg_control file: %s\n"),
progname, strerror(errno));
exit(1);
}
errno = 0;
if (write(fd, buffer, PG_CONTROL_FILE_SIZE) != PG_CONTROL_FILE_SIZE)
{
/* if write didn't set errno, assume problem is no disk space */
if (errno == 0)
errno = ENOSPC;
fprintf(stderr, _("%s: could not write pg_control file: %s\n"),
progname, strerror(errno));
exit(1);
}
if (do_sync)
{
if (fsync(fd) != 0)
{
fprintf(stderr, _("%s: fsync error: %s\n"), progname, strerror(errno));
exit(1);
}
}
if (close(fd) < 0)
{
fprintf(stderr, _("%s: could not close control file: %s\n"), progname, strerror(errno));
exit(1);
}
}
#if PG_VERSION_NUM < 120000
enum pg_log_level __pg_log_level;
static int log_flags;
static void (*log_pre_callback) (void);
static void (*log_locus_callback) (const char **, uint64 *);
static const char *sgr_error = NULL;
static const char *sgr_warning = NULL;
static const char *sgr_locus = NULL;
#define SGR_ERROR_DEFAULT "01;31"
#define SGR_WARNING_DEFAULT "01;35"
#define SGR_LOCUS_DEFAULT "01"
#define ANSI_ESCAPE_FMT "\x1b[%sm"
#define ANSI_ESCAPE_RESET "\x1b[0m"
/*
* This should be called before any output happens.
*/
void
pg_logging_init(const char *argv0)
{
const char *pg_color_env = getenv("PG_COLOR");
char *token;
bool log_color = false;
/* usually the default, but not on Windows */
setvbuf(stderr, NULL, _IONBF, 0);
progname = get_progname(argv0);
__pg_log_level = PG_LOG_INFO;
if (pg_color_env)
{
if (strcmp(pg_color_env, "always") == 0 ||
(strcmp(pg_color_env, "auto") == 0 && isatty(fileno(stderr))))
log_color = true;
}
if (log_color)
{
const char *pg_colors_env = getenv("PG_COLORS");
if (pg_colors_env)
{
char *colors = strdup(pg_colors_env);
if (colors)
{
for (token = strtok(colors, ":"); token; token = strtok(NULL, ":"))
{
char *e = strchr(token, '=');
if (e)
{
char *name;
char *value;
*e = '\0';
name = token;
value = e + 1;
if (strcmp(name, "error") == 0)
sgr_error = strdup(value);
if (strcmp(name, "warning") == 0)
sgr_warning = strdup(value);
if (strcmp(name, "locus") == 0)
sgr_locus = strdup(value);
}
}
free(colors);
}
}
else
{
sgr_error = SGR_ERROR_DEFAULT;
sgr_warning = SGR_WARNING_DEFAULT;
sgr_locus = SGR_LOCUS_DEFAULT;
}
}
}
void
pg_log_generic(enum pg_log_level level, const char *pg_restrict fmt,...)
{
va_list ap;
va_start(ap, fmt);
pg_log_generic_v(level, fmt, ap);
va_end(ap);
}
void
pg_log_generic_v(enum pg_log_level level, const char *pg_restrict fmt, va_list ap)
{
int save_errno = errno;
const char *filename = NULL;
uint64 lineno = 0;
va_list ap2;
size_t required_len;
char *buf;
Assert(progname);
Assert(level);
Assert(fmt);
Assert(fmt[strlen(fmt) - 1] != '\n');
/*
* Flush stdout before output to stderr, to ensure sync even when stdout
* is buffered.
*/
fflush(stdout);
if (log_pre_callback)
log_pre_callback();
if (log_locus_callback)
log_locus_callback(&filename, &lineno);
fmt = _(fmt);
if (!(log_flags & PG_LOG_FLAG_TERSE) || filename)
{
if (sgr_locus)
fprintf(stderr, ANSI_ESCAPE_FMT, sgr_locus);
if (!(log_flags & PG_LOG_FLAG_TERSE))
fprintf(stderr, "%s:", progname);
if (filename)
{
fprintf(stderr, "%s:", filename);
if (lineno > 0)
fprintf(stderr, UINT64_FORMAT ":", lineno);
}
fprintf(stderr, " ");
if (sgr_locus)
fprintf(stderr, ANSI_ESCAPE_RESET);
}
if (!(log_flags & PG_LOG_FLAG_TERSE))
{
switch (level)
{
case PG_LOG_FATAL:
if (sgr_error)
fprintf(stderr, ANSI_ESCAPE_FMT, sgr_error);
fprintf(stderr, _("fatal: "));
if (sgr_error)
fprintf(stderr, ANSI_ESCAPE_RESET);
break;
case PG_LOG_ERROR:
if (sgr_error)
fprintf(stderr, ANSI_ESCAPE_FMT, sgr_error);
fprintf(stderr, _("error: "));
if (sgr_error)
fprintf(stderr, ANSI_ESCAPE_RESET);
break;
case PG_LOG_WARNING:
if (sgr_warning)
fprintf(stderr, ANSI_ESCAPE_FMT, sgr_warning);
fprintf(stderr, _("warning: "));
if (sgr_warning)
fprintf(stderr, ANSI_ESCAPE_RESET);
break;
default:
break;
}
}
errno = save_errno;
va_copy(ap2, ap);
required_len = vsnprintf(NULL, 0, fmt, ap2) + 1;
va_end(ap2);
buf = pg_malloc(required_len);
errno = save_errno; /* malloc might change errno */
if (!buf)
{
/* memory trouble, just print what we can and get out of here */
vfprintf(stderr, fmt, ap);
return;
}
vsnprintf(buf, required_len, fmt, ap);
/* strip one newline, for PQerrorMessage() */
if (required_len >= 2 && buf[required_len - 2] == '\n')
buf[required_len - 2] = '\0';
fprintf(stderr, "%s\n", buf);
free(buf);
}
#endif /* PG_VERSION_NUM < 120000 */
/*
* Look at the version string stored in PG_VERSION and decide if this utility
* can be run safely or not (adpated from pg_resetwal).
*/
void
CheckDataVersion(char *DataDir)
{
const char *ver_file = "PG_VERSION";
char ver_filepath[MAXPGPATH];
FILE *ver_fd;
char rawline[64];
int len;
strcpy(ver_filepath, DataDir);
strcat(ver_filepath, "/");
strcat(ver_filepath, ver_file);
if ((ver_fd = fopen(ver_filepath, "r")) == NULL)
{
pg_log_error("could not open file \"%s\" for reading: %m",
ver_filepath);
exit(1);
}
/* version number has to be the first line read */
if (!fgets(rawline, sizeof(rawline), ver_fd))
{
if (!ferror(ver_fd))
pg_log_error("unexpected empty file \"%s\"", ver_filepath);
else
pg_log_error("could not read file \"%s\": %m", ver_filepath);
exit(1);
}
/* strip trailing newline and carriage return */
len = strlen(rawline);
if (len > 0 && rawline[len - 1] == '\n')
{
rawline[--len] = '\0';
if (len > 0 && rawline[len - 1] == '\r')
rawline[--len] = '\0';
}
if (strcmp(rawline, PG_MAJORVERSION) != 0)
{
pg_log_error("data directory is of wrong version");
pg_log_info("File \"%s\" contains \"%s\", which is not compatible with this program's version \"%s\".",
ver_file, rawline, PG_MAJORVERSION);
exit(1);
}
fclose(ver_fd);
}
#if PG_VERSION_NUM >= 170000
/*
* Provide strictly harmonized handling of the --sync-method option.
*/
bool
parse_sync_method(const char *optarg, DataDirSyncMethod *sync_method)
{
if (strcmp(optarg, "fsync") == 0)
*sync_method = DATA_DIR_SYNC_METHOD_FSYNC;
else if (strcmp(optarg, "syncfs") == 0)
{
#ifdef HAVE_SYNCFS
*sync_method = DATA_DIR_SYNC_METHOD_SYNCFS;
#else
pg_log_error("this build does not support sync method \"%s\"",
"syncfs");
return false;
#endif
}
else
{
pg_log_error("unrecognized sync method: %s", optarg);
return false;
}
return true;
}
#endif /* PG_VERSION_NUM >= 170000 */