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exec.c File Reference
#include "postgres_fe.h"
#include <fcntl.h>
#include "pg_upgrade.h"
Include dependency graph for exec.c:

Go to the source code of this file.

Macros

#define MAXCMDLEN   (2 * MAXPGPATH)
 

Functions

static void check_data_dir (ClusterInfo *cluster)
 
static void check_bin_dir (ClusterInfo *cluster)
 
static void get_bin_version (ClusterInfo *cluster)
 
static void validate_exec (const char *dir, const char *cmdName)
 
bool exec_prog (const char *log_file, const char *opt_log_file, bool throw_error, const char *fmt,...)
 
bool pid_lock_file_exists (const char *datadir)
 
void verify_directories (void)
 
static void check_single_dir (const char *pg_data, const char *subdir)
 

Macro Definition Documentation

#define MAXCMDLEN   (2 * MAXPGPATH)

Referenced by exec_prog().

Function Documentation

static void check_bin_dir ( ClusterInfo cluster)
static

Definition at line 364 of file exec.c.

References ClusterInfo::bin_version, ClusterInfo::bindir, get_bin_version(), GET_MAJOR_VERSION, new_cluster, old_cluster, PG_FATAL, report_status(), strerror(), and validate_exec().

Referenced by verify_directories().

365 {
366  struct stat statBuf;
367 
368  /* check bindir */
369  if (stat(cluster->bindir, &statBuf) != 0)
370  report_status(PG_FATAL, "check for \"%s\" failed: %s\n",
371  cluster->bindir, strerror(errno));
372  else if (!S_ISDIR(statBuf.st_mode))
373  report_status(PG_FATAL, "%s is not a directory\n",
374  cluster->bindir);
375 
376  validate_exec(cluster->bindir, "postgres");
377  validate_exec(cluster->bindir, "pg_ctl");
378 
379  /*
380  * Fetch the binary versions after checking for the existence of pg_ctl,
381  * this gives a correct error if the binary used itself for the version
382  * fetching is broken.
383  */
386 
387  /* pg_resetxlog has been renamed to pg_resetwal in version 10 */
388  if (GET_MAJOR_VERSION(cluster->bin_version) < 1000)
389  validate_exec(cluster->bindir, "pg_resetxlog");
390  else
391  validate_exec(cluster->bindir, "pg_resetwal");
392  if (cluster == &new_cluster)
393  {
394  /* these are only needed in the new cluster */
395  validate_exec(cluster->bindir, "psql");
396  validate_exec(cluster->bindir, "pg_dump");
397  validate_exec(cluster->bindir, "pg_dumpall");
398  }
399 }
#define GET_MAJOR_VERSION(v)
Definition: pg_upgrade.h:29
ClusterInfo new_cluster
Definition: pg_upgrade.c:56
ClusterInfo old_cluster
Definition: pg_upgrade.c:56
char * bindir
Definition: pg_upgrade.h:267
uint32 bin_version
Definition: pg_upgrade.h:274
static void validate_exec(const char *dir, const char *cmdName)
Definition: exec.c:408
static void get_bin_version(ClusterInfo *cluster)
Definition: exec.c:32
const char * strerror(int errnum)
Definition: strerror.c:19
void report_status(eLogType type, const char *fmt,...) pg_attribute_printf(2
static void check_data_dir ( ClusterInfo cluster)
static

Definition at line 325 of file exec.c.

References check_single_dir(), get_major_server_version(), GET_MAJOR_VERSION, ClusterInfo::major_version, new_cluster, old_cluster, pg_data, and ClusterInfo::pgdata.

Referenced by verify_directories().

326 {
327  const char *pg_data = cluster->pgdata;
328 
329  /* get old and new cluster versions */
332 
333  check_single_dir(pg_data, "");
334  check_single_dir(pg_data, "base");
335  check_single_dir(pg_data, "global");
336  check_single_dir(pg_data, "pg_multixact");
337  check_single_dir(pg_data, "pg_subtrans");
338  check_single_dir(pg_data, "pg_tblspc");
339  check_single_dir(pg_data, "pg_twophase");
340 
341  /* pg_xlog has been renamed to pg_wal in v10 */
342  if (GET_MAJOR_VERSION(cluster->major_version) < 1000)
343  check_single_dir(pg_data, "pg_xlog");
344  else
345  check_single_dir(pg_data, "pg_wal");
346 
347  /* pg_clog has been renamed to pg_xact in v10 */
348  if (GET_MAJOR_VERSION(cluster->major_version) < 1000)
349  check_single_dir(pg_data, "pg_clog");
350  else
351  check_single_dir(pg_data, "pg_xact");
352 }
uint32 get_major_server_version(ClusterInfo *cluster)
Definition: server.c:155
uint32 major_version
Definition: pg_upgrade.h:272
#define GET_MAJOR_VERSION(v)
Definition: pg_upgrade.h:29
ClusterInfo new_cluster
Definition: pg_upgrade.c:56
ClusterInfo old_cluster
Definition: pg_upgrade.c:56
static char * pg_data
Definition: initdb.c:121
static void check_single_dir(const char *pg_data, const char *subdir)
Definition: exec.c:296
char * pgdata
Definition: pg_upgrade.h:264
static void check_single_dir ( const char *  pg_data,
const char *  subdir 
)
static

Definition at line 296 of file exec.c.

References MAXPGPATH, PG_FATAL, report_status(), snprintf(), and strerror().

Referenced by check_data_dir().

297 {
298  struct stat statBuf;
299  char subDirName[MAXPGPATH];
300 
301  snprintf(subDirName, sizeof(subDirName), "%s%s%s", pg_data,
302  /* Win32 can't stat() a directory with a trailing slash. */
303  *subdir ? "/" : "",
304  subdir);
305 
306  if (stat(subDirName, &statBuf) != 0)
307  report_status(PG_FATAL, "check for \"%s\" failed: %s\n",
308  subDirName, strerror(errno));
309  else if (!S_ISDIR(statBuf.st_mode))
310  report_status(PG_FATAL, "%s is not a directory\n",
311  subDirName);
312 }
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define MAXPGPATH
static char * pg_data
Definition: initdb.c:121
const char * strerror(int errnum)
Definition: strerror.c:19
void report_status(eLogType type, const char *fmt,...) pg_attribute_printf(2
bool exec_prog ( const char *  log_file,
const char *  opt_log_file,
bool  throw_error,
const char *  fmt,
  ... 
)

Definition at line 77 of file exec.c.

References MAXCMDLEN, NULL, PG_FATAL, pg_fatal(), pg_log(), PG_REPORT, pg_usleep(), PG_VERBOSE, report_status(), result, snprintf(), and vsnprintf().

Referenced by copy_subdir_files(), copy_xact_xlog_xid(), generate_old_dump(), main(), parallel_exec_prog(), prepare_new_cluster(), prepare_new_databases(), start_postmaster(), and stop_postmaster().

79 {
80  int result = 0;
81  int written;
82 
83 #define MAXCMDLEN (2 * MAXPGPATH)
84  char cmd[MAXCMDLEN];
85  FILE *log;
86  va_list ap;
87 
88 #ifdef WIN32
89  static DWORD mainThreadId = 0;
90 
91  /* We assume we are called from the primary thread first */
92  if (mainThreadId == 0)
93  mainThreadId = GetCurrentThreadId();
94 #endif
95 
96  written = 0;
97  va_start(ap, fmt);
98  written += vsnprintf(cmd + written, MAXCMDLEN - written, fmt, ap);
99  va_end(ap);
100  if (written >= MAXCMDLEN)
101  pg_fatal("command too long\n");
102  written += snprintf(cmd + written, MAXCMDLEN - written,
103  " >> \"%s\" 2>&1", log_file);
104  if (written >= MAXCMDLEN)
105  pg_fatal("command too long\n");
106 
107  pg_log(PG_VERBOSE, "%s\n", cmd);
108 
109 #ifdef WIN32
110 
111  /*
112  * For some reason, Windows issues a file-in-use error if we write data to
113  * the log file from a non-primary thread just before we create a
114  * subprocess that also writes to the same log file. One fix is to sleep
115  * for 100ms. A cleaner fix is to write to the log file _after_ the
116  * subprocess has completed, so we do this only when writing from a
117  * non-primary thread. fflush(), running system() twice, and pre-creating
118  * the file do not see to help.
119  */
120  if (mainThreadId != GetCurrentThreadId())
121  result = system(cmd);
122 #endif
123 
124  log = fopen(log_file, "a");
125 
126 #ifdef WIN32
127  {
128  /*
129  * "pg_ctl -w stop" might have reported that the server has stopped
130  * because the postmaster.pid file has been removed, but "pg_ctl -w
131  * start" might still be in the process of closing and might still be
132  * holding its stdout and -l log file descriptors open. Therefore,
133  * try to open the log file a few more times.
134  */
135  int iter;
136 
137  for (iter = 0; iter < 4 && log == NULL; iter++)
138  {
139  pg_usleep(1000000); /* 1 sec */
140  log = fopen(log_file, "a");
141  }
142  }
143 #endif
144 
145  if (log == NULL)
146  pg_fatal("cannot write to log file %s\n", log_file);
147 
148 #ifdef WIN32
149  /* Are we printing "command:" before its output? */
150  if (mainThreadId == GetCurrentThreadId())
151  fprintf(log, "\n\n");
152 #endif
153  fprintf(log, "command: %s\n", cmd);
154 #ifdef WIN32
155  /* Are we printing "command:" after its output? */
156  if (mainThreadId != GetCurrentThreadId())
157  fprintf(log, "\n\n");
158 #endif
159 
160  /*
161  * In Windows, we must close the log file at this point so the file is not
162  * open while the command is running, or we get a share violation.
163  */
164  fclose(log);
165 
166 #ifdef WIN32
167  /* see comment above */
168  if (mainThreadId == GetCurrentThreadId())
169 #endif
170  result = system(cmd);
171 
172  if (result != 0)
173  {
174  /* we might be in on a progress status line, so go to the next line */
175  report_status(PG_REPORT, "\n*failure*");
176  fflush(stdout);
177 
178  pg_log(PG_VERBOSE, "There were problems executing \"%s\"\n", cmd);
179  if (opt_log_file)
180  pg_log(throw_error ? PG_FATAL : PG_REPORT,
181  "Consult the last few lines of \"%s\" or \"%s\" for\n"
182  "the probable cause of the failure.\n",
183  log_file, opt_log_file);
184  else
185  pg_log(throw_error ? PG_FATAL : PG_REPORT,
186  "Consult the last few lines of \"%s\" for\n"
187  "the probable cause of the failure.\n",
188  log_file);
189  }
190 
191 #ifndef WIN32
192 
193  /*
194  * We can't do this on Windows because it will keep the "pg_ctl start"
195  * output filename open until the server stops, so we do the \n\n above on
196  * that platform. We use a unique filename for "pg_ctl start" that is
197  * never reused while the server is running, so it works fine. We could
198  * log these commands to a third file, but that just adds complexity.
199  */
200  if ((log = fopen(log_file, "a")) == NULL)
201  pg_fatal("cannot write to log file %s\n", log_file);
202  fprintf(log, "\n\n");
203  fclose(log);
204 #endif
205 
206  return result == 0;
207 }
static char * log_file
Definition: pg_ctl.c:83
return result
Definition: formatting.c:1632
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
void pg_fatal(const char *fmt,...)
Definition: logging.c:83
int int vsnprintf(char *str, size_t count, const char *fmt, va_list args)
void pg_usleep(long microsec)
Definition: signal.c:53
#define MAXCMDLEN
void pg_log(eLogType type, const char *fmt,...)
Definition: logging.c:69
#define NULL
Definition: c.h:229
void report_status(eLogType type, const char *fmt,...) pg_attribute_printf(2
static void get_bin_version ( ClusterInfo cluster)
static

Definition at line 32 of file exec.c.

References ClusterInfo::bin_version, ClusterInfo::bindir, MAX_STRING, MAXPGPATH, NULL, output(), pg_fatal(), snprintf(), and strerror().

Referenced by check_bin_dir().

33 {
34  char cmd[MAXPGPATH],
35  cmd_output[MAX_STRING];
36  FILE *output;
37  int pre_dot = 0,
38  post_dot = 0;
39 
40  snprintf(cmd, sizeof(cmd), "\"%s/pg_ctl\" --version", cluster->bindir);
41 
42  if ((output = popen(cmd, "r")) == NULL ||
43  fgets(cmd_output, sizeof(cmd_output), output) == NULL)
44  pg_fatal("could not get pg_ctl version data using %s: %s\n",
45  cmd, strerror(errno));
46 
47  pclose(output);
48 
49  /* Remove trailing newline */
50  if (strchr(cmd_output, '\n') != NULL)
51  *strchr(cmd_output, '\n') = '\0';
52 
53  if (sscanf(cmd_output, "%*s %*s %d.%d", &pre_dot, &post_dot) < 1)
54  pg_fatal("could not get version from %s\n", cmd);
55 
56  cluster->bin_version = (pre_dot * 100 + post_dot) * 100;
57 }
static void output(uint64 loop_count)
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
void pg_fatal(const char *fmt,...)
Definition: logging.c:83
#define MAXPGPATH
char * bindir
Definition: pg_upgrade.h:267
#define MAX_STRING
Definition: pg_upgrade.h:21
uint32 bin_version
Definition: pg_upgrade.h:274
#define NULL
Definition: c.h:229
const char * strerror(int errnum)
Definition: strerror.c:19
bool pid_lock_file_exists ( const char *  datadir)

Definition at line 216 of file exec.c.

References close, fd(), MAXPGPATH, pg_fatal(), snprintf(), and strerror().

Referenced by setup().

217 {
218  char path[MAXPGPATH];
219  int fd;
220 
221  snprintf(path, sizeof(path), "%s/postmaster.pid", datadir);
222 
223  if ((fd = open(path, O_RDONLY, 0)) < 0)
224  {
225  /* ENOTDIR means we will throw a more useful error later */
226  if (errno != ENOENT && errno != ENOTDIR)
227  pg_fatal("could not open file \"%s\" for reading: %s\n",
228  path, strerror(errno));
229 
230  return false;
231  }
232 
233  close(fd);
234  return true;
235 }
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
void pg_fatal(const char *fmt,...)
Definition: logging.c:83
static int fd(const char *x, int i)
Definition: preproc-init.c:105
#define MAXPGPATH
char * datadir
const char * strerror(int errnum)
Definition: strerror.c:19
#define close(a)
Definition: win32.h:12
static void validate_exec ( const char *  dir,
const char *  cmdName 
)
static

Definition at line 408 of file exec.c.

References MAXPGPATH, pg_fatal(), pg_strcasecmp(), snprintf(), strerror(), and strlcat().

Referenced by check_bin_dir().

409 {
410  char path[MAXPGPATH];
411  struct stat buf;
412 
413  snprintf(path, sizeof(path), "%s/%s", dir, cmdName);
414 
415 #ifdef WIN32
416  /* Windows requires a .exe suffix for stat() */
417  if (strlen(path) <= strlen(EXE_EXT) ||
418  pg_strcasecmp(path + strlen(path) - strlen(EXE_EXT), EXE_EXT) != 0)
419  strlcat(path, EXE_EXT, sizeof(path));
420 #endif
421 
422  /*
423  * Ensure that the file exists and is a regular file.
424  */
425  if (stat(path, &buf) < 0)
426  pg_fatal("check for \"%s\" failed: %s\n",
427  path, strerror(errno));
428  else if (!S_ISREG(buf.st_mode))
429  pg_fatal("check for \"%s\" failed: not an executable file\n",
430  path);
431 
432  /*
433  * Ensure that the file is both executable and readable (required for
434  * dynamic loading).
435  */
436 #ifndef WIN32
437  if (access(path, R_OK) != 0)
438 #else
439  if ((buf.st_mode & S_IRUSR) == 0)
440 #endif
441  pg_fatal("check for \"%s\" failed: cannot read file (permission denied)\n",
442  path);
443 
444 #ifndef WIN32
445  if (access(path, X_OK) != 0)
446 #else
447  if ((buf.st_mode & S_IXUSR) == 0)
448 #endif
449  pg_fatal("check for \"%s\" failed: cannot execute (permission denied)\n",
450  path);
451 }
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
void pg_fatal(const char *fmt,...)
Definition: logging.c:83
int pg_strcasecmp(const char *s1, const char *s2)
Definition: pgstrcasecmp.c:36
#define MAXPGPATH
static char * buf
Definition: pg_test_fsync.c:66
const char * strerror(int errnum)
Definition: strerror.c:19
size_t strlcat(char *dst, const char *src, size_t siz)
Definition: strlcat.c:33
void verify_directories ( void  )

Definition at line 247 of file exec.c.

References check_bin_dir(), check_data_dir(), new_cluster, old_cluster, and pg_fatal().

Referenced by setup().

248 {
249 #ifndef WIN32
250  if (access(".", R_OK | W_OK | X_OK) != 0)
251 #else
252  if (win32_check_directory_write_permissions() != 0)
253 #endif
254  pg_fatal("You must have read and write access in the current directory.\n");
255 
260 }
static void check_bin_dir(ClusterInfo *cluster)
Definition: exec.c:364
void pg_fatal(const char *fmt,...)
Definition: logging.c:83
ClusterInfo new_cluster
Definition: pg_upgrade.c:56
ClusterInfo old_cluster
Definition: pg_upgrade.c:56
static void check_data_dir(ClusterInfo *cluster)
Definition: exec.c:325