[sql] Import reference version of SQLite 3.17..

third_party/sqlite/sqlite-src-3170000/test/symlink.test

Index: third_party/sqlite/sqlite-src-3170000/test/symlink.test
diff --git a/third_party/sqlite/sqlite-src-3170000/test/symlink.test b/third_party/sqlite/sqlite-src-3170000/test/symlink.test
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+# 2015 October 31
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this file is testing that SQLite can follow symbolic links.
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix symlink
+
+# This only runs on unix.
+if {$::tcl_platform(platform)!="unix"} {
+  finish_test
+  return
+}
+
+# Ensure that test.db has been created.
+#
+do_execsql_test 1.0 {
+  CREATE TABLE t1(x, y);
+}
+
+# Test that SQLite follows symlinks when opening files.
+#
+forcedelete test.db2
+do_test 1.1 {
+  file link test.db2 test.db
+  sqlite3 db2 test.db2
+  sqlite3_db_filename db2 main
+} [file join [pwd] test.db]
+
+# Test that if the symlink points to a file that does not exists, it is
+# created when it is opened.
+#
+do_test 1.2.1 {
+  db2 close
+  db close
+  forcedelete test.db
+  file exists test.db
+} 0
+do_test 1.2.2 {
+  sqlite3 db2 test.db2
+  file exists test.db
+} 1
+do_test 1.2.3 {
+  sqlite3_db_filename db2 main
+} [file join [pwd] test.db]
+db2 close
+
+# Test that a loop of symlinks cannot be opened.
+#
+do_test 1.3 {
+  forcedelete test.db
+  # Note: Tcl [file link] command is too smart to create loops of symlinks.
+  exec ln -s test.db2 test.db
+  list [catch { sqlite3 db test.db } msg] $msg
+} {1 {unable to open database file}}
+
+# Test that overly large paths cannot be opened.
+#
+do_test 1.4 {
+  set name "test.db[string repeat x 502]"
+  list [catch { sqlite3 db $name } msg] $msg
+} {1 {unable to open database file}}
+do_test 1.5 {
+  set r [expr 510 - [string length test.db] - [string length [pwd]]]
+  set name "test.db[string repeat x $r]"
+  list [catch { sqlite3 db $name } msg] $msg
+} {1 {unable to open database file}}
+
+#-------------------------------------------------------------------------
+# Test that journal and wal files are created next to the real file,
+# not the symlink.
+#
+do_test 2.0 {
+  catch { db close }
+  catch { db2 close }
+  forcedelete test.db test.db2 test.db3
+  sqlite3 db test.db
+  execsql { CREATE TABLE t1(x) }
+  file link test.db2 test.db
+  file link test.db3 test.db2
+  set {} {}
+} {}
+
+foreach {tn f} {1 test.db2 2 test.db3} {
+  do_test 2.$tn.1 {
+    sqlite3 db2 $f
+    file exists test.db-journal
+  } 0
+  do_test 2.$tn.2 {
+    execsql {
+      BEGIN;
+        INSERT INTO t1 VALUES(1);
+    } db2
+    file exists test.db-journal
+  } 1
+  do_test 2.$tn.3 {
+    list [file exists test2.db-journal] [file exists test3.db-journal]
+  } {0 0}
+  do_test 2.$tn.4 {
+    execsql {
+      COMMIT;
+      PRAGMA journal_mode = wal;
+      INSERT INTO t1 VALUES(2);
+    } db2
+    file exists test.db-wal
+  } 1
+  do_test 2.$tn.5 {
+    list [file exists test2.db-wal] [file exists test3.db-wal]
+  } {0 0}
+  do_execsql_test 2.$tn.6 {
+    SELECT * FROM t1;
+  } {1 2}
+  db2 close
+  do_execsql_test 2.$tn.7 {
+    DELETE FROM t1;
+    PRAGMA journal_mode = delete;
+  } delete
+}
+
+# Try to open a ridiculously long pathname.  Bug found by
+# Kostya Serebryany using libFuzzer on 2015-11-30.
+#
+do_test 3.1 {
+  db close
+  catch {sqlite3 db [string repeat [string repeat x 100]/ 6]} res
+  set res
+} {unable to open database file}
+
+#-------------------------------------------------------------------------
+# Test that relative symlinks that are not located in the cwd work.
+#
+do_test 4.1 {
+  forcedelete x y z
+  file mkdir x
+  file mkdir y
+  file mkdir z
+  sqlite3 db x/test.db
+  file link y/test.db ../x/test.db
+  file link z/test.db ../y/test.db
+  execsql {
+    PRAGMA journal_mode = wal;
+    CREATE TABLE t1(x, y);
+    INSERT INTO t1 VALUES('hello', 'world');
+  }
+} {wal}
+
+do_test 4.2.1 {
+  db close
+  sqlite3 db y/test.db
+  db eval { SELECT * FROM t1 }
+} {hello world}
+do_test 4.2.2 {
+  list [file exists x/test.db-wal] [file exists y/test.db-wal]
+} {1 0}
+
+do_test 4.3.1 {
+  db close
+  sqlite3 db z/test.db
+  db eval { SELECT * FROM t1 }
+} {hello world}
+do_test 4.3.2 {
+  list [file exists x/test.db-wal] [file exists y/test.db-wal] \
+       [file exists z/test.db-wal]
+} {1 0 0}
+
+do_test 4.4.0 {
+  forcedelete w
+  file mkdir w
+  file link w/test.db [file join [pwd] x/test.db] 
+  set {} {}
+} {}
+do_test 4.4.1 {
+  db close
+  sqlite3 db w/test.db
+  db eval { SELECT * FROM t1 }
+} {hello world}
+do_test 4.4.2 {
+  list [file exists x/test.db-wal] [file exists w/test.db-wal]
+} {1 0}
+
+finish_test