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Avoid using readlink() on platforms that don't support it

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We don't have any such platforms now, but might in the future.

Also, detect cases when a tablespace symlink points to a path that
is longer than we can handle, and give a warning.
This commit is contained in:
Magnus Hagander 2011-12-07 12:09:05 +01:00
parent 16d8e594ac
commit 1f422db663
1 changed files with 22 additions and 3 deletions
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23
src/backend/replication/basebackup.c
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@ -109,6 +109,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
{ {
char fullpath[MAXPGPATH]; char fullpath[MAXPGPATH];
char linkpath[MAXPGPATH]; char linkpath[MAXPGPATH];
int rllen;
/* Skip special stuff */ /* Skip special stuff */
if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0) if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
@ -116,19 +117,37 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir)
snprintf(fullpath, sizeof(fullpath), "pg_tblspc/%s", de->d_name); snprintf(fullpath, sizeof(fullpath), "pg_tblspc/%s", de->d_name);
MemSet(linkpath, 0, sizeof(linkpath)); #if defined(HAVE_READLINK) || defined(WIN32)
if (readlink(fullpath, linkpath, sizeof(linkpath) - 1) == -1) rllen = readlink(fullpath, linkpath, sizeof(linkpath) - 1);
if (rllen < 0)
{ {
ereport(WARNING, ereport(WARNING,
(errmsg("could not read symbolic link \"%s\": %m", fullpath))); (errmsg("could not read symbolic link \"%s\": %m", fullpath)));
continue; continue;
} }
else if (rllen >= sizeof(linkpath))
{
ereport(WARNING,
(errmsg("symbolic link \"%s\" target is too long", fullpath)));
continue;
}
linkpath[rllen] = '\0';
ti = palloc(sizeof(tablespaceinfo)); ti = palloc(sizeof(tablespaceinfo));
ti->oid = pstrdup(de->d_name); ti->oid = pstrdup(de->d_name);
ti->path = pstrdup(linkpath); ti->path = pstrdup(linkpath);
ti->size = opt->progress ? sendDir(linkpath, strlen(linkpath), true) : -1; ti->size = opt->progress ? sendDir(linkpath, strlen(linkpath), true) : -1;
tablespaces = lappend(tablespaces, ti); tablespaces = lappend(tablespaces, ti);
#else
/*
* If the platform does not have symbolic links, it should not be possible
* to have tablespaces - clearly somebody else created them. Warn about it
* and ignore.
*/
ereport(WARNING,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("tablespaces are not supported on this platform")));
#endif
} }
/* Add a node for the base directory at the end */ /* Add a node for the base directory at the end */