sqlite3/test/symlink2.test

# 2019 November 18
#
# 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 symlink2

# This only runs on Windows.
if {$::tcl_platform(platform)!="windows"} {
  finish_test
  return
}

proc createWin32Symlink { link target } {
  exec -- $::env(ComSpec) /c mklink \
      [file nativename $link] [file nativename $target]
  return ""
}

proc deleteWin32Symlink { link } {
  exec -- $::env(ComSpec) /c del [file nativename $link]
  return ""
}

proc canCreateWin32Symlink {} {
  set link [file join $::testdir lnk[pid].sym]
  if {[file exists $link]} { return 0 }
  set target [info nameofexecutable]
  if {[catch {createWin32Symlink $link $target}] == 0} {
    deleteWin32Symlink $link
    return 1
  }
  return 0
}

# Creating symlinks may require administrator privileges on Windows.
if {![canCreateWin32Symlink]} {
  finish_test
  return
}

# Ensure that test.db has been created.
#
do_execsql_test 1.0 {
  CREATE TABLE t1(x, y);
  INSERT INTO t1 VALUES(1,9999);
}

do_test 2.0 {
  createWin32Symlink link.db test.db
} {}

do_test 2.1 {
  file exists test.db
} {1}

do_test 2.2 {
  file exists link.db
} {1}

do_test 3.1 {
  execsql { SELECT x, y FROM t1; } db
} {1 9999}

do_test 3.2 {
  sqlite3 db2 link.db
  execsql { SELECT x, y FROM t1; } db2
} {1 9999}

do_test 3.3 {
  sqlite3 db3 test.db -nofollow true
  execsql { SELECT x, y FROM t1; } db3
} {1 9999}

do_test 3.4 {
  db3 close
} {}

do_test 3.5 {
  list [catch {
    sqlite3 db4 link.db -nofollow true
    execsql { SELECT x, y FROM t1; } db4
  } res] $res
} {1 {unable to open database file}}

catch {db4 close}

do_test 4.0 {
  db2 close
  deleteWin32Symlink link.db
} {}

do_test 4.1 {
  file exists test.db
} {1}

do_test 4.2 {
  file exists link.db
} {0}

do_test 5.1 {
  execsql { SELECT x, y FROM t1; } db
} {1 9999}

finish_test