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pg_upgrade: Fix exec_prog API to be less flaky 

The previous signature made it very easy to pass something other than
the printf-format specifier in the corresponding position, without any
warning from the compiler.

While at it, move some of the escaping, redirecting and quoting
responsibilities from the callers into exec_prog() itself.  This makes
the callsites cleaner.
This commit is contained in:
Alvaro Herrera 2012-08-27 14:21:09 -04:00
parent 34c02044ed
commit 088c065ce8
6 changed files with 96 additions and 113 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
contrib/pg_upgrade/check.c
View File

@ -183,13 +183,10 @@ issue_warnings(char *sequence_script_file_name)
if (sequence_script_file_name)
{
prep_status("Adjusting sequences");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/psql\" --echo-queries "
"--set ON_ERROR_STOP=on "
"--no-psqlrc --port %d --username \"%s\" "
"-f \"%s\" --dbname template1 >> \"%s\" 2>&1" SYSTEMQUOTE,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/psql\" " EXEC_PSQL_ARGS " --port %d --username \"%s\" -f \"%s\"",
new_cluster.bindir, new_cluster.port, os_info.user,
sequence_script_file_name, UTILITY_LOG_FILE);
sequence_script_file_name);
unlink(sequence_script_file_name);
check_ok();
}

9
contrib/pg_upgrade/dump.c
View File

@ -23,12 +23,11 @@ generate_old_dump(void)
* --binary-upgrade records the width of dropped columns in pg_class, and
* restores the frozenid's for databases and relations.
*/
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/pg_dumpall\" --port %d --username \"%s\" "
"--schema-only --binary-upgrade %s > \"%s\" 2>> \"%s\""
SYSTEMQUOTE, new_cluster.bindir, old_cluster.port, os_info.user,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_dumpall\" --port %d --username \"%s\" --schema-only --binary-upgrade %s -f %s",
new_cluster.bindir, old_cluster.port, os_info.user,
log_opts.verbose ? "--verbose" : "",
ALL_DUMP_FILE, UTILITY_LOG_FILE);
ALL_DUMP_FILE);
check_ok();
}

80
contrib/pg_upgrade/exec.c
View File

@ -26,77 +26,81 @@ static int win32_check_directory_write_permissions(void);
/*
* exec_prog()
* Execute an external program with stdout/stderr redirected, and report
* errors
*
* Formats a command from the given argument list and executes that
* command. If the command executes, exec_prog() returns 1 otherwise
* exec_prog() logs an error message and returns 0. Either way, the command
* line to be executed is saved to the specified log file.
* Formats a command from the given argument list, logs it to the log file,
* and attempts to execute that command. If the command executes
* successfully, exec_prog() returns true.
*
* If throw_error is TRUE, this function will throw a PG_FATAL error
* instead of returning should an error occur. The command it appended
* to log_file; opt_log_file is used in error messages.
* If the command fails, an error message is saved to the specified log_file.
* If throw_error is true, this raises a PG_FATAL error and pg_upgrade
* terminates; otherwise it is just reported as PG_REPORT and exec_prog()
* returns false.
*/
int
exec_prog(bool throw_error, bool is_priv, const char *log_file,
const char *opt_log_file, const char *fmt,...)
bool
exec_prog(const char *log_file, const char *opt_log_file,
bool throw_error, const char *fmt,...)
{
va_list args;
int result;
int retval;
char cmd[MAXPGPATH];
int written;
#define MAXCMDLEN (2 * MAXPGPATH)
char cmd[MAXCMDLEN];
mode_t old_umask = 0;
FILE *log;
va_list ap;
if (is_priv)
old_umask = umask(S_IRWXG | S_IRWXO);
old_umask = umask(S_IRWXG | S_IRWXO);
va_start(args, fmt);
vsnprintf(cmd, MAXPGPATH, fmt, args);
va_end(args);
written = strlcpy(cmd, SYSTEMQUOTE, strlen(SYSTEMQUOTE));
va_start(ap, fmt);
written += vsnprintf(cmd + written, MAXCMDLEN - written, fmt, ap);
va_end(ap);
if (written >= MAXCMDLEN)
pg_log(PG_FATAL, "command too long\n");
written += snprintf(cmd + written, MAXCMDLEN - written,
" >> \"%s\" 2>&1" SYSTEMQUOTE, log_file);
if (written >= MAXCMDLEN)
pg_log(PG_FATAL, "command too long\n");
if ((log = fopen_priv(log_file, "a+")) == NULL)
pg_log(PG_FATAL, "cannot write to log file %s\n", log_file);
pg_log(PG_VERBOSE, "%s\n", cmd);
fprintf(log, "command: %s\n", cmd);
/*
* In Windows, we must close then reopen the log file so the file is
* not open while the command is running, or we get a share violation.
* In Windows, we must close the log file at this point so the file is not
* open while the command is running, or we get a share violation.
*/
fclose(log);
result = system(cmd);
if (is_priv)
umask(old_umask);
umask(old_umask);
if (result != 0)
{
char opt_string[MAXPGPATH];
/* Create string for optional second log file */
if (opt_log_file)
snprintf(opt_string, sizeof(opt_string), " or \"%s\"", opt_log_file);
else
opt_string[0] = '\0';
report_status(PG_REPORT, "*failure*");
fflush(stdout);
pg_log(PG_VERBOSE, "There were problems executing \"%s\"\n", cmd);
pg_log(throw_error ? PG_FATAL : PG_REPORT,
"Consult the last few lines of \"%s\"%s for\n"
"the probable cause of the failure.\n",
log_file, opt_string);
retval = 1;
if (opt_log_file)
pg_log(throw_error ? PG_FATAL : PG_REPORT,
"Consult the last few lines of \"%s\" or \"%s\" for\n"
"the probable cause of the failure.\n",
log_file, opt_log_file);
else
pg_log(throw_error ? PG_FATAL : PG_REPORT,
"Consult the last few lines of \"%s\" for\n"
"the probable cause of the failure.\n",
log_file);
}
else
retval = 0;
if ((log = fopen_priv(log_file, "a+")) == NULL)
pg_log(PG_FATAL, "cannot write to log file %s\n", log_file);
fprintf(log, "\n\n");
fclose(log);
return retval;
return result == 0;
}

68
contrib/pg_upgrade/pg_upgrade.c
View File

@ -140,11 +140,10 @@ main(int argc, char **argv)
* because there is no need to have the schema load use new oids.
*/
prep_status("Setting next OID for new cluster");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/pg_resetxlog\" -o %u \"%s\" >> \"%s\" 2>&1"
SYSTEMQUOTE,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -o %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtoid,
new_cluster.pgdata, UTILITY_LOG_FILE);
new_cluster.pgdata);
check_ok();
create_script_for_cluster_analyze(&analyze_script_file_name);
@ -211,11 +210,10 @@ prepare_new_cluster(void)
* --analyze so autovacuum doesn't update statistics later
*/
prep_status("Analyzing all rows in the new cluster");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
"--all --analyze %s >> \"%s\" 2>&1" SYSTEMQUOTE,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/vacuumdb\" --port %d --username \"%s\" --all --analyze %s",
new_cluster.bindir, new_cluster.port, os_info.user,
log_opts.verbose ? "--verbose" : "", UTILITY_LOG_FILE);
log_opts.verbose ? "--verbose" : "");
check_ok();
/*
@ -225,11 +223,10 @@ prepare_new_cluster(void)
* later.
*/
prep_status("Freezing all rows on the new cluster");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/vacuumdb\" --port %d --username \"%s\" "
"--all --freeze %s >> \"%s\" 2>&1" SYSTEMQUOTE,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/vacuumdb\" --port %d --username \"%s\" --all --freeze %s",
new_cluster.bindir, new_cluster.port, os_info.user,
log_opts.verbose ? "--verbose" : "", UTILITY_LOG_FILE);
log_opts.verbose ? "--verbose" : "");
check_ok();
get_pg_database_relfilenode(&new_cluster);
@ -263,14 +260,10 @@ prepare_new_databases(void)
* support functions in template1 but pg_dumpall creates database using
* the template0 template.
*/
exec_prog(true, true, RESTORE_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/psql\" --echo-queries "
"--set ON_ERROR_STOP=on "
/* --no-psqlrc prevents AUTOCOMMIT=off */
"--no-psqlrc --port %d --username \"%s\" "
"-f \"%s\" --dbname template1 >> \"%s\" 2>&1" SYSTEMQUOTE,
exec_prog(RESTORE_LOG_FILE, NULL, true,
"\"%s/psql\" " EXEC_PSQL_ARGS " --port %d --username \"%s\" -f \"%s\"",
new_cluster.bindir, new_cluster.port, os_info.user,
GLOBALS_DUMP_FILE, RESTORE_LOG_FILE);
GLOBALS_DUMP_FILE);
check_ok();
/* we load this to get a current list of databases */
@ -296,13 +289,10 @@ create_new_objects(void)
check_ok();
prep_status("Restoring database schema to new cluster");
exec_prog(true, true, RESTORE_LOG_FILE, NULL,
SYSTEMQUOTE "\"%s/psql\" --echo-queries "
"--set ON_ERROR_STOP=on "
"--no-psqlrc --port %d --username \"%s\" "
"-f \"%s\" --dbname template1 >> \"%s\" 2>&1" SYSTEMQUOTE,
exec_prog(RESTORE_LOG_FILE, NULL, true,
"\"%s/psql\" " EXEC_PSQL_ARGS " --port %d --username \"%s\" -f \"%s\"",
new_cluster.bindir, new_cluster.port, os_info.user,
DB_DUMP_FILE, RESTORE_LOG_FILE);
DB_DUMP_FILE);
check_ok();
/* regenerate now that we have objects in the databases */
@ -331,16 +321,14 @@ copy_subdir_files(char *subdir)
prep_status("Copying old %s to new server", subdir);
exec_prog(true, false, UTILITY_LOG_FILE, NULL,
exec_prog(UTILITY_LOG_FILE, NULL, true,
#ifndef WIN32
SYSTEMQUOTE "%s \"%s\" \"%s\" >> \"%s\" 2>&1" SYSTEMQUOTE,
"cp -Rf",
"cp -Rf \"%s\" \"%s\"",
#else
/* flags: everything, no confirm, quiet, overwrite read-only */
SYSTEMQUOTE "%s \"%s\" \"%s\\\" >> \"%s\" 2>&1" SYSTEMQUOTE,
"xcopy /e /y /q /r",
"xcopy /e /y /q /r \"%s\" \"%s\\\"",
#endif
old_path, new_path, UTILITY_LOG_FILE);
old_path, new_path);
check_ok();
}
@ -353,22 +341,18 @@ copy_clog_xlog_xid(void)
/* set the next transaction id of the new cluster */
prep_status("Setting next transaction ID for new cluster");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE
"\"%s/pg_resetxlog\" -f -x %u \"%s\" >> \"%s\" 2>&1"
SYSTEMQUOTE, new_cluster.bindir,
old_cluster.controldata.chkpnt_nxtxid,
new_cluster.pgdata, UTILITY_LOG_FILE);
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -f -x %u \"%s\"",
new_cluster.bindir, old_cluster.controldata.chkpnt_nxtxid,
new_cluster.pgdata);
check_ok();
/* now reset the wal archives in the new cluster */
prep_status("Resetting WAL archives");
exec_prog(true, true, UTILITY_LOG_FILE, NULL,
SYSTEMQUOTE
"\"%s/pg_resetxlog\" -l %s \"%s\" >> \"%s\" 2>&1"
SYSTEMQUOTE, new_cluster.bindir,
exec_prog(UTILITY_LOG_FILE, NULL, true,
"\"%s/pg_resetxlog\" -l %s \"%s\"", new_cluster.bindir,
old_cluster.controldata.nextxlogfile,
new_cluster.pgdata, UTILITY_LOG_FILE);
new_cluster.pgdata);
check_ok();
}

9
contrib/pg_upgrade/pg_upgrade.h
View File

@ -316,10 +316,11 @@ void split_old_dump(void);
/* exec.c */
int
exec_prog(bool throw_error, bool is_priv, const char *log_file,
const char *opt_log_file, const char *cmd,...)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 5, 6)));
#define EXEC_PSQL_ARGS "--echo-queries --set ON_ERROR_STOP=on --no-psqlrc --dbname=template1"
bool
exec_prog(const char *log_file, const char *opt_log_file,
bool throw_error, const char *fmt,...)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 4, 5)));
void verify_directories(void);
bool is_server_running(const char *datadir);

34
contrib/pg_upgrade/server.c
View File

@ -143,7 +143,7 @@ start_postmaster(ClusterInfo *cluster)
char cmd[MAXPGPATH];
PGconn *conn;
bool exit_hook_registered = false;
int pg_ctl_return = 0;
bool pg_ctl_return = false;
if (!exit_hook_registered)
{
@ -159,22 +159,23 @@ start_postmaster(ClusterInfo *cluster)
* not touch them.
*/
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" "
"-o \"-p %d %s %s\" start >> \"%s\" 2>&1" SYSTEMQUOTE,
"\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d %s %s\" start",
cluster->bindir, SERVER_LOG_FILE, cluster->pgconfig, cluster->port,
(cluster->controldata.cat_ver >=
BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? "-b" :
"-c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
cluster->pgopts ? cluster->pgopts : "", SERVER_START_LOG_FILE);
cluster->pgopts ? cluster->pgopts : "");
/*
* Don't throw an error right away, let connecting throw the error because
* it might supply a reason for the failure.
*/
pg_ctl_return = exec_prog(false, true, SERVER_START_LOG_FILE,
/* pass both file names if the differ */
(strcmp(SERVER_LOG_FILE, SERVER_START_LOG_FILE) != 0) ?
pg_ctl_return = exec_prog(SERVER_START_LOG_FILE,
/* pass both file names if they differ */
(strcmp(SERVER_LOG_FILE,
SERVER_START_LOG_FILE) != 0) ?
SERVER_LOG_FILE : NULL,
false,
"%s", cmd);
/* Check to see if we can connect to the server; if not, report it. */
@ -185,13 +186,14 @@ start_postmaster(ClusterInfo *cluster)
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
pg_log(PG_FATAL, "could not connect to %s postmaster started with the command: %s\n",
pg_log(PG_FATAL, "could not connect to %s postmaster started with the command:\n"
"%s\n",
CLUSTER_NAME(cluster), cmd);
}
PQfinish(conn);
/* If the connection didn't fail, fail now */
if (pg_ctl_return != 0)
if (!pg_ctl_return)
pg_log(PG_FATAL, "pg_ctl failed to start the %s server, or connection failed\n",
CLUSTER_NAME(cluster));
@ -202,7 +204,6 @@ start_postmaster(ClusterInfo *cluster)
void
stop_postmaster(bool fast)
{
char cmd[MAXPGPATH];
ClusterInfo *cluster;
if (os_info.running_cluster == &old_cluster)
@ -212,14 +213,11 @@ stop_postmaster(bool fast)
else
return; /* no cluster running */
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" "
"%s stop >> \"%s\" 2>&1" SYSTEMQUOTE,
cluster->bindir, cluster->pgconfig,
cluster->pgopts ? cluster->pgopts : "",
fast ? "-m fast" : "", SERVER_STOP_LOG_FILE);
exec_prog(fast ? false : true, true, SERVER_STOP_LOG_FILE, NULL, "%s", cmd);
exec_prog(SERVER_STOP_LOG_FILE, NULL, !fast,
"\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" %s stop",
cluster->bindir, cluster->pgconfig,
cluster->pgopts ? cluster->pgopts : "",
fast ? "-m fast" : "");
os_info.running_cluster = NULL;
}