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archive.h File Reference
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Functions

int RestoreArchivedFile (const char *path, const char *xlogfname, off_t expectedSize, const char *restoreCommand)
 

Function Documentation

◆ RestoreArchivedFile()

int RestoreArchivedFile ( const char *  path,
const char *  xlogfname,
off_t  expectedSize,
const char *  restoreCommand 
)

Definition at line 39 of file archive.c.

41 {
42  char xlogpath[MAXPGPATH];
43  char *xlogRestoreCmd;
44  int rc;
45  struct stat stat_buf;
46 
47  snprintf(xlogpath, MAXPGPATH, "%s/" XLOGDIR "/%s", path, xlogfname);
48 
49  xlogRestoreCmd = BuildRestoreCommand(restoreCommand, xlogpath,
50  xlogfname, NULL);
51 
52  /*
53  * Execute restore_command, which should copy the missing file from
54  * archival storage.
55  */
56  fflush(NULL);
57  rc = system(xlogRestoreCmd);
58  pfree(xlogRestoreCmd);
59 
60  if (rc == 0)
61  {
62  /*
63  * Command apparently succeeded, but let's make sure the file is
64  * really there now and has the correct size.
65  */
66  if (stat(xlogpath, &stat_buf) == 0)
67  {
68  if (expectedSize > 0 && stat_buf.st_size != expectedSize)
69  pg_fatal("unexpected file size for \"%s\": %lld instead of %lld",
70  xlogfname, (long long int) stat_buf.st_size,
71  (long long int) expectedSize);
72  else
73  {
74  int xlogfd = open(xlogpath, O_RDONLY | PG_BINARY, 0);
75 
76  if (xlogfd < 0)
77  pg_fatal("could not open file \"%s\" restored from archive: %m",
78  xlogpath);
79  else
80  return xlogfd;
81  }
82  }
83  else
84  {
85  if (errno != ENOENT)
86  pg_fatal("could not stat file \"%s\": %m",
87  xlogpath);
88  }
89  }
90 
91  /*
92  * If the failure was due to a signal, then it would be misleading to
93  * return with a failure at restoring the file. So just bail out and
94  * exit. Hard shell errors such as "command not found" are treated as
95  * fatal too.
96  */
97  if (wait_result_is_any_signal(rc, true))
98  pg_fatal("\"restore_command\" failed: %s",
99  wait_result_to_str(rc));
100 
101  /*
102  * The file is not available, so just let the caller decide what to do
103  * next.
104  */
105  pg_log_error("could not restore file \"%s\" from archive",
106  xlogfname);
107  return -1;
108 }
#define PG_BINARY
Definition: c.h:1273
char * BuildRestoreCommand(const char *restoreCommand, const char *xlogpath, const char *xlogfname, const char *lastRestartPointFname)
Definition: archive.c:39
static void const char fflush(stdout)
#define pg_log_error(...)
Definition: logging.h:106
void pfree(void *pointer)
Definition: mcxt.c:1521
#define pg_fatal(...)
#define MAXPGPATH
#define snprintf
Definition: port.h:238
char * wait_result_to_str(int exitstatus)
Definition: wait_error.c:33
bool wait_result_is_any_signal(int exit_status, bool include_command_not_found)
Definition: wait_error.c:121
#define stat
Definition: win32_port.h:284
#define XLOGDIR

References BuildRestoreCommand(), fflush(), MAXPGPATH, pfree(), PG_BINARY, pg_fatal, pg_log_error, snprintf, stat::st_size, stat, wait_result_is_any_signal(), wait_result_to_str(), and XLOGDIR.