Ant task to run an Ant target only if a file exists

Question

Is there an ANT Task that would execute a block only if a given file exists   I have the problem that I have a generic ant script that should do some special processing but only if a specific configuration file is present

User · Accepted Answer

Available and Condition   lt target name  check-abc  gt       lt available file  abc txt  property  abc present   gt   lt  target gt    lt target name  do-if-abc  depends  check-abc  if  abc present  gt           lt  target gt

User · Answer

Check Using Filename filters like DB        sql  Here is a variation to perform an action if one or more files exist corresponding to a wildcard filter  That is  you don t know the exact name of the file    Here  we are looking for    sql  files in any sub-directories called  DB     recursively  You can adjust the filter to your needs   NB  Apache Ant 1 7 and higher   Here is the target to set a property if matching files exist    lt target name  check for sql files  gt       lt condition property  sql to deploy  gt           lt resourcecount when  greater  count  0  gt               lt fileset dir     includes  DB        sql   gt           lt  resourcecount gt       lt  condition gt   lt  target gt    Here is a  conditional  target that only runs if files exist    lt target name  do stuff  depends  check for sql files  if  sql to deploy  gt       lt  -- Do stuff here -- gt   lt  target gt

User · Answer

You can do it by ordering to do the operation with a list of files with names equal to the name s  you need  It is much easier and direct than to create a special target  And you needn t any additional tools  just pure Ant    lt delete gt       lt fileset includes  name or names of file or files you need to delete   gt   lt  delete gt    See  FileSet

User · Answer

I think its worth referencing this similar answer  https   stackoverflow com a 5288804 64313  Here is a another quick solution  There are other variations possible on this using the  lt available gt  tag     exit with failure if no files are found  lt property name  file  value    some path  some txt    gt   lt fail message  FILE NOT FOUND    file   gt       lt condition gt  lt not gt           lt available file    file     gt       lt  not gt  lt  condition gt   lt  fail gt

User · Answer

Since Ant 1 8 0 there s apparently also resourceexists  From http   ant apache org manual Tasks conditions html     Tests a resource for existance  since   Ant 1 8 0      The actual resource to test is   specified as a nested element       An example    lt resourceexists gt     lt file file    file    gt   lt  resourceexists gt     I was about rework the example from the above good answer to this question  and then I found this     As of Ant 1 8 0  you may instead use   property expansion  a value of true    or on or yes  will enable the item    while false  or off or no  will   disable it  Other values are still   assumed to be property names and so   the item is enabled only if the named   property is defined       Compared to the older style  this   gives you additional flexibility    because you can override the condition   from the command line or parent   scripts    lt target name  -check-use-file  unless  file exists  gt       lt available property  file exists  file  some-file   gt   lt  target gt   lt target name  use-file  depends  -check-use-file  if    file exists   gt       lt  -- do something requiring that file    -- gt   lt  target gt   lt target name  lots-of-stuff  depends  use-file other-unconditional-stuff   gt     from the ant manual at http   ant apache org manual properties html if unless  Hopefully this example is of use to some   They re not using resourceexists  but presumably you could

User · Answer

This might make a little more sense from a coding perspective  available with ant-contrib  http   ant-contrib sourceforge net      lt target name  someTarget  gt       lt if gt           lt available file  abc txt   gt           lt then gt                           lt  then gt           lt else gt                           lt  else gt       lt  if gt   lt  target gt

[file] Ant task to run an Ant target only if a file exists?

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