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Remove arbitrary MAXPGPATH limit on command lengths in pg_ctl.

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Replace fixed-length command buffers with psprintf() calls.  We didn't
have anything as convenient as psprintf() when this code was written,
but now that we do, there's little reason for the limitation to
stand.  Removing it eliminates some corner cases where (for example)
starting the postmaster with a whole lot of options fails.

Most individual file names that pg_ctl deals with are still restricted
to MAXPGPATH, but we've seldom had complaints about that limitation
so long as it only applies to one filename.

Back-patch to all supported branches.

Phil Krylov

Discussion: https://postgr.es/m/567e199c6b97ee19deee600311515b86@krylov.eu
This commit is contained in:
Tom Lane 2021-09-03 21:04:44 -04:00
parent db2760a841
commit 87ad491472
1 changed files with 22 additions and 22 deletions
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44
src/bin/pg_ctl/pg_ctl.c
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@ -442,7 +442,7 @@ free_readfile(char **optlines)
static pgpid_t
start_postmaster(void)
{
char cmd[MAXPGPATH];
char *cmd;
#ifndef WIN32
pgpid_t pm_pid;
@ -487,12 +487,12 @@ start_postmaster(void)
* has the same PID as the current child process.
*/
if (log_file != NULL)
snprintf(cmd, MAXPGPATH, "exec \"%s\" %s%s < \"%s\" >> \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts,
DEVNULL, log_file);
cmd = psprintf("exec \"%s\" %s%s < \"%s\" >> \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts,
DEVNULL, log_file);
else
snprintf(cmd, MAXPGPATH, "exec \"%s\" %s%s < \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts, DEVNULL);
cmd = psprintf("exec \"%s\" %s%s < \"%s\" 2>&1",
exec_path, pgdata_opt, post_opts, DEVNULL);
(void) execl("/bin/sh", "/bin/sh", "-c", cmd, (char *) NULL);
@ -553,12 +553,12 @@ start_postmaster(void)
else
close(fd);
snprintf(cmd, MAXPGPATH, "\"%s\" /C \"\"%s\" %s%s < \"%s\" >> \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL, log_file);
cmd = psprintf("\"%s\" /C \"\"%s\" %s%s < \"%s\" >> \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL, log_file);
}
else
snprintf(cmd, MAXPGPATH, "\"%s\" /C \"\"%s\" %s%s < \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL);
cmd = psprintf("\"%s\" /C \"\"%s\" %s%s < \"%s\" 2>&1\"",
comspec, exec_path, pgdata_opt, post_opts, DEVNULL);
if (!CreateRestrictedProcess(cmd, &pi, false))
{
@ -828,7 +828,7 @@ find_other_exec_or_die(const char *argv0, const char *target, const char *versio
static void
do_init(void)
{
char cmd[MAXPGPATH];
char *cmd;
if (exec_path == NULL)
exec_path = find_other_exec_or_die(argv0, "initdb", "initdb (PostgreSQL) " PG_VERSION "\n");
@ -840,11 +840,11 @@ do_init(void)
post_opts = "";
if (!silent_mode)
snprintf(cmd, MAXPGPATH, "\"%s\" %s%s",
exec_path, pgdata_opt, post_opts);
cmd = psprintf("\"%s\" %s%s",
exec_path, pgdata_opt, post_opts);
else
snprintf(cmd, MAXPGPATH, "\"%s\" %s%s > \"%s\"",
exec_path, pgdata_opt, post_opts, DEVNULL);
cmd = psprintf("\"%s\" %s%s > \"%s\"",
exec_path, pgdata_opt, post_opts, DEVNULL);
if (system(cmd) != 0)
{
@ -2175,9 +2175,9 @@ set_starttype(char *starttypeopt)
static void
adjust_data_dir(void)
{
char cmd[MAXPGPATH],
filename[MAXPGPATH],
*my_exec_path;
char filename[MAXPGPATH];
char *my_exec_path,
*cmd;
FILE *fd;
/* do nothing if we're working without knowledge of data dir */
@ -2207,10 +2207,10 @@ adjust_data_dir(void)
my_exec_path = pg_strdup(exec_path);
/* it's important for -C to be the first option, see main.c */
snprintf(cmd, MAXPGPATH, "\"%s\" -C data_directory %s%s",
my_exec_path,
pgdata_opt ? pgdata_opt : "",
post_opts ? post_opts : "");
cmd = psprintf("\"%s\" -C data_directory %s%s",
my_exec_path,
pgdata_opt ? pgdata_opt : "",
post_opts ? post_opts : "");
fd = popen(cmd, "r");
if (fd == NULL || fgets(filename, sizeof(filename), fd) == NULL)