Re: [Bug-tar] add --ignore-missing to ignore missing input files

[Nathan Stratton Treadway]

On Thu, Apr 26, 2012 at 01:37:26 -0400, Nathan Stratton Treadway wrote:
> $ touch file1.test; (sleep 1; rm file1.test)&  tar cf t1.tar *.test; echo 
> "Exit: $?"
> [1] 2074
> tar: file1.test: Cannot stat: No such file or directory
> tar: Exiting with failure status due to previous errors
> [1]+  Done                    ( sleep 1; rm file1.test )
> Exit: 2
> $ tar tf t1.tar
> big.test
> file2.test

(In case it's not already clear, the above behavior is in contrast to
the situation where a file gets deleted after being found in a
subdirectory as tar is recursively processing a directory tree -- in that
case we get the "File removed before we read it" message that's
currently found in file_removed_diag().

For example:

$ mkdir testdir
$ cp -p big.test testdir/big1.test
$ cp -p big.test testdir/big2.test
$ cp -p big.test testdir/big3.test
$ ls -U testdir/
big1.test  big2.test  big3.test

  [Since tar processes the files within a subdirectory in unsorted
  directory-entry order, to be sure that the deleted files catches tar
  mid-run, I just make all three files big, and then delete the one
  listed in the middle of the "ls -U" output.]

$ (sleep 1; rm testdir/big2.test)&  tar cvf t5.tar testdir ; echo "Exit: $?"
[1] 6423
testdir/
testdir/big1.test
tar: testdir/big2.test: File removed before we read it
testdir/big3.test
tar: testdir: file changed as we read it
[1]+  Done                    ( sleep 1; rm testdir/big2.test )
Exit: 1


In this situation, --ignored-failed-read had no effect on the run:

$ cp -p big.test testdir/big2.test
$ ls -U testdir/
big1.test  big2.test  big3.test
$ (sleep 1; rm testdir/big2.test)&  tar cvf t6.tar testdir --ignore-failed-read 
; echo "Exit: $?"
[1] 6465
testdir/
testdir/big1.test
tar: testdir/big2.test: File removed before we read it
testdir/big3.test
tar: testdir: file changed as we read it
[1]+  Done                    ( sleep 1; rm testdir/big2.test )
Exit: 1

)

                                                Nathan


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