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| author | Magnus Hagander <magnus@hagander.net> | 2011-12-07 12:09:05 +0100 |
|---|---|---|
| committer | Magnus Hagander <magnus@hagander.net> | 2011-12-07 12:09:59 +0100 |
| commit | 9c32da5caa2efc9bdc7f04ae26488211ff219e8a (patch) | |
| tree | 7aa083721520b8221fb252334bbe8abb994afc86 /src/backend/replication/basebackup.c | |
| parent | 75594e0cf7674d78ba40699ff614a847fe675dc2 (diff) | |
| download | postgresql-9c32da5caa2efc9bdc7f04ae26488211ff219e8a.tar.gz postgresql-9c32da5caa2efc9bdc7f04ae26488211ff219e8a.zip | |
Avoid using readlink() on platforms that don't support it
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.
Diffstat (limited to 'src/backend/replication/basebackup.c')
| -rw-r--r-- | src/backend/replication/basebackup.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/src/backend/replication/basebackup.c b/src/backend/replication/basebackup.c index d6ed49a26fa..73a7f17149e 100644 --- a/src/backend/replication/basebackup.c +++ b/src/backend/replication/basebackup.c @@ -108,6 +108,7 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir) { char fullpath[MAXPGPATH]; char linkpath[MAXPGPATH]; + int rllen; /* Skip special stuff */ if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0) @@ -115,19 +116,37 @@ perform_base_backup(basebackup_options *opt, DIR *tblspcdir) snprintf(fullpath, sizeof(fullpath), "pg_tblspc/%s", de->d_name); - MemSet(linkpath, 0, sizeof(linkpath)); - if (readlink(fullpath, linkpath, sizeof(linkpath) - 1) == -1) +#if defined(HAVE_READLINK) || defined(WIN32) + rllen = readlink(fullpath, linkpath, sizeof(linkpath) - 1); + if (rllen < 0) + { + ereport(WARNING, + (errmsg("could not read symbolic link \"%s\": %m", fullpath))); + continue; + } + else if (rllen >= sizeof(linkpath)) { ereport(WARNING, - (errmsg("could not read symbolic link \"%s\": %m", fullpath))); + (errmsg("symbolic link \"%s\" target is too long", fullpath))); continue; } + linkpath[rllen] = '\0'; ti = palloc(sizeof(tablespaceinfo)); ti->oid = pstrdup(de->d_name); ti->path = pstrdup(linkpath); ti->size = opt->progress ? sendDir(linkpath, strlen(linkpath), true) : -1; 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 */ |