/*
* rmtree
*
* Delete a directory tree recursively.
* Assumes path points to a valid directory.
* Deletes everything under path.
* If rmtopdir is true deletes the directory too.
* Returns true if successful, false if there was any problem.
* (The details of the problem are reported already, so caller
* doesn't really have to say anything more, but most do.)
*/
bool
rmtree(const char *path, bool rmtopdir)
{
bool result = true;
char pathbuf[MAXPGPATH];
char **filenames;
char **filename;
struct stat statbuf;
/*
* we copy all the names out of the directory before we start modifying
* it.
*/
filenames = pgfnames(path);
if (filenames == NULL)
return false;
/* now we have the names we can start removing things */
for (filename = filenames; *filename; filename++)
{
snprintf(pathbuf, MAXPGPATH, "%s/%s", path, *filename);
/*
* It's ok if the file is not there anymore; we were just about to
* delete it anyway.
*
* This is not an academic possibility. One scenario where this
* happens is when bgwriter has a pending unlink request for a file in
* a database that's being dropped. In dropdb(), we call
* ForgetDatabaseFsyncRequests() to flush out any such pending unlink
* requests, but because that's asynchronous, it's not guaranteed that
* the bgwriter receives the message in time.
*/
if (lstat(pathbuf, &statbuf) != 0)
{
if (errno != ENOENT)
{
#ifndef FRONTEND
elog(WARNING, "could not stat file or directory \"%s\": %m",
pathbuf);
#else
fprintf(stderr, _("could not stat file or directory \"%s\": %s\n"),
pathbuf, strerror(errno));
#endif
result = false;
}
continue;
}
if (S_ISDIR(statbuf.st_mode))
{
/* call ourselves recursively for a directory */
if (!rmtree(pathbuf, true))
{
/* we already reported the error */
result = false;
}
}
else
{
if (unlink(pathbuf) != 0)
{
if (errno != ENOENT)
{
#ifndef FRONTEND
elog(WARNING, "could not remove file or directory \"%s\": %m",
pathbuf);
#else
fprintf(stderr, _("could not remove file or directory \"%s\": %s\n"),
pathbuf, strerror(errno));
#endif
result = false;
}
}
}
}
if (rmtopdir)
{
if (rmdir(path) != 0)
{
#ifndef FRONTEND
elog(WARNING, "could not remove file or directory \"%s\": %m",
path);
#else
fprintf(stderr, _("could not remove file or directory \"%s\": %s\n"),
path, strerror(errno));
#endif
result = false;
}
}
pgfnames_cleanup(filenames);
return result;
}
/*
* Recursively scan the timezone database looking for the best match to
* the system timezone behavior.
*
* tzdir points to a buffer of size MAXPGPATH. On entry, it holds the
* pathname of a directory containing TZ files. We internally modify it
* to hold pathnames of sub-directories and files, but must restore it
* to its original contents before exit.
*
* tzdirsub points to the part of tzdir that represents the subfile name
* (ie, tzdir + the original directory name length, plus one for the
* first added '/').
*
* tt tells about the system timezone behavior we need to match.
*
* *bestscore and *bestzonename on entry hold the best score found so far
* and the name of the best zone. We overwrite them if we find a better
* score. bestzonename must be a buffer of length TZ_STRLEN_MAX + 1.
*/
static void
scan_available_timezones(char *tzdir, char *tzdirsub, struct tztry *tt,
int *bestscore, char *bestzonename)
{
int tzdir_orig_len = strlen(tzdir);
char **names;
char **namep;
names = pgfnames(tzdir);
if (!names)
return;
for (namep = names; *namep; namep++)
{
char *name = *namep;
struct stat statbuf;
/* Ignore . and .., plus any other "hidden" files */
if (name[0] == '.')
continue;
snprintf(tzdir + tzdir_orig_len, MAXPGPATH - tzdir_orig_len,
"/%s", name);
if (stat(tzdir, &statbuf) != 0)
{
#ifdef DEBUG_IDENTIFY_TIMEZONE
fprintf(stderr, "could not stat \"%s\": %s\n",
tzdir, strerror(errno));
#endif
tzdir[tzdir_orig_len] = '\0';
continue;
}
if (S_ISDIR(statbuf.st_mode))
{
/* Recurse into subdirectory */
scan_available_timezones(tzdir, tzdirsub, tt,
bestscore, bestzonename);
}
else
{
/* Load and test this file */
int score = score_timezone(tzdirsub, tt);
if (score > *bestscore)
{
*bestscore = score;
strlcpy(bestzonename, tzdirsub, TZ_STRLEN_MAX + 1);
}
else if (score == *bestscore)
{
/* Consider how to break a tie */
if (strlen(tzdirsub) < strlen(bestzonename) ||
(strlen(tzdirsub) == strlen(bestzonename) &&
strcmp(tzdirsub, bestzonename) < 0))
strlcpy(bestzonename, tzdirsub, TZ_STRLEN_MAX + 1);
}
}
/* Restore tzdir */
tzdir[tzdir_orig_len] = '\0';
}
pgfnames_cleanup(names);
}
