/*
* Find another program in our binary's directory,
* then make sure it is the proper version.
*/
int
find_other_exec(const char *argv0, const char *target,
const char *versionstr, char *retpath)
{
char cmd[MAXPGPATH];
char line[100];
if (find_my_exec(argv0, retpath) < 0)
return -1;
/* Trim off program name and keep just directory */
*last_dir_separator(retpath) = '\0';
canonicalize_path(retpath);
/* Now append the other program's name */
snprintf(retpath + strlen(retpath), MAXPGPATH - strlen(retpath),
"/%s%s", target, EXE);
if (validate_exec(retpath) != 0)
return -1;
snprintf(cmd, sizeof(cmd), "\"%s\" -V 2>%s", retpath, DEVNULL);
if (!pipe_read_line(cmd, line, sizeof(line)))
return -1;
if (strcmp(line, versionstr) != 0)
return -2;
return 0;
}
/*
* check_bin_dir()
*
* This function searches for the executables that we expect to find
* in the binaries directory. If we find that a required executable
* is missing (or secured against us), we display an error message and
* exit().
*/
static void
check_bin_dir(ClusterInfo *cluster)
{
struct stat statBuf;
/* check bindir */
if (stat(cluster->bindir, &statBuf) != 0)
report_status(PG_FATAL, "check for \"%s\" failed: %s\n",
cluster->bindir, getErrorText(errno));
else if (!S_ISDIR(statBuf.st_mode))
report_status(PG_FATAL, "%s is not a directory\n",
cluster->bindir);
validate_exec(cluster->bindir, "postgres");
validate_exec(cluster->bindir, "pg_ctl");
validate_exec(cluster->bindir, "pg_resetxlog");
if (cluster == &new_cluster)
{
/* these are only needed in the new cluster */
validate_exec(cluster->bindir, "psql");
validate_exec(cluster->bindir, "pg_dumpall");
}
}
/*
* check_bin_dir()
*
* This function searches for the executables that we expect to find
* in the binaries directory. If we find that a required executable
* is missing (or secured against us), we display an error message and
* exit().
*/
static void
check_bin_dir(ClusterInfo *cluster)
{
validate_exec(cluster->bindir, "postgres");
validate_exec(cluster->bindir, "pg_ctl");
validate_exec(cluster->bindir, "pg_resetxlog");
if (cluster == &new_cluster)
{
/* these are only needed in the new cluster */
validate_exec(cluster->bindir, "pg_config");
validate_exec(cluster->bindir, "psql");
validate_exec(cluster->bindir, "pg_dumpall");
}
}
/*
* Find another program in our binary's directory,
* then make sure it is the proper version.
*/
int
find_other_exec(const char *argv0, const char *target,
const char *versionstr, char *retpath)
{
char cmd[MAXPGPATH];
char line[100];
if (find_my_exec(argv0, retpath) < 0)
return -1;
/* Trim off program name and keep just directory */
*last_dir_separator(retpath) = '\0';
canonicalize_path(retpath);
/* Now append the other program's name */
snprintf(retpath + strlen(retpath), MAXPGPATH - strlen(retpath),
"/%s%s", target, EXE);
if (validate_exec(retpath) != 0)
return -1;
/*
* In PostgreSQL, the version check is always performed. In GPDB, this
* is also used to find scripts that don't necessarily have the same
* version output (in particular, pg_regress uses this to find gpdiff.pl)
*/
if (versionstr)
{
snprintf(cmd, sizeof(cmd), "\"%s\" -V 2>%s", retpath, DEVNULL);
if (!pipe_read_line(cmd, line, sizeof(line)))
return -1;
if (strcmp(line, versionstr) != 0)
return -2;
}
return 0;
}
/*
* find_my_exec -- find an absolute path to a valid executable
*
* argv0 is the name passed on the command line
* retpath is the output area (must be of size MAXPGPATH)
* Returns 0 if OK, -1 if error.
*
* The reason we have to work so hard to find an absolute path is that
* on some platforms we can't do dynamic loading unless we know the
* executable's location. Also, we need a full path not a relative
* path because we will later change working directory. Finally, we want
* a true path not a symlink location, so that we can locate other files
* that are part of our installation relative to the executable.
*
* This function is not thread-safe because it calls validate_exec(),
* which calls getgrgid(). This function should be used only in
* non-threaded binaries, not in library routines.
*/
int
find_my_exec(const char *argv0, char *retpath)
{
char cwd[MAXPGPATH],
test_path[MAXPGPATH];
char *path;
if (!getcwd(cwd, MAXPGPATH))
{
log_error(_("could not identify current directory: %s"),
strerror(errno));
return -1;
}
/*
* If argv0 contains a separator, then PATH wasn't used.
*/
if (first_dir_separator(argv0) != NULL)
{
if (is_absolute_path(argv0))
StrNCpy(retpath, argv0, MAXPGPATH);
else
join_path_components(retpath, cwd, argv0);
canonicalize_path(retpath);
if (validate_exec(retpath) == 0)
return resolve_symlinks(retpath);
log_error(_("invalid binary \"%s\""), retpath);
return -1;
}
#ifdef WIN32
/* Win32 checks the current directory first for names without slashes */
join_path_components(retpath, cwd, argv0);
if (validate_exec(retpath) == 0)
return resolve_symlinks(retpath);
#endif
/*
* Since no explicit path was supplied, the user must have been relying on
* PATH. We'll search the same PATH.
*/
if ((path = getenv("PATH")) && *path)
{
char *startp = NULL,
*endp = NULL;
do
{
if (!startp)
startp = path;
else
startp = endp + 1;
endp = first_path_separator(startp);
if (!endp)
endp = startp + strlen(startp); /* point to end */
StrNCpy(test_path, startp, Min(endp - startp + 1, MAXPGPATH));
if (is_absolute_path(test_path))
join_path_components(retpath, test_path, argv0);
else
{
join_path_components(retpath, cwd, test_path);
join_path_components(retpath, retpath, argv0);
}
canonicalize_path(retpath);
switch (validate_exec(retpath))
{
case 0: /* found ok */
return resolve_symlinks(retpath);
case -1: /* wasn't even a candidate, keep looking */
break;
case -2: /* found but disqualified */
log_error(_("could not read binary \"%s\""),
retpath);
break;
}
} while (*endp);
}
log_error(_("could not find a \"%s\" to execute"), argv0);
return -1;
}