[Bug 15471] New: tar --exclude did not consider --strip-components

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15471

            Bug ID: 15471
           Summary: tar --exclude did not consider --strip-components
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Standard Compliance
          Assignee: unassigned at busybox.net
          Reporter: kkocdko at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

# tar --exclude did not consider --strip-components

While gnu tar extract a tar file with content `./dir1/dir2/file`, using
`--strip-components 1 --exclude dir2` switches, it will first strip `dir1`,
then match and exclude `dir2`.

However what busybox's tar implementation do is first to match and exclude,
then do `--strip-components 1`.

The test.sh here:

```sh
# tested on debian:11 livecd and fedora:37 livecd
busybox

# clear old files
rm -rf bb-test

# prepair for testing
mkdir -p bb-test/dir1/dir2
cd bb-test
echo file3-content > dir1/dir2/file3
tar -cf a.tar ./dir1
mkdir out-coreut-1 out-busybo-1 out-coreut-2 out-busybo-2

# let's try!
        tar -xf a.tar -C out-coreut-1 --strip-components 1 --exclude dir1
busybox tar -xf a.tar -C out-busybo-1 --strip-components 1 --exclude dir1
        tar -xf a.tar -C out-coreut-2 --strip-components 1 --exclude dir2
busybox tar -xf a.tar -C out-busybo-2 --strip-components 1 --exclude dir2

# see difference
echo "" && tree out-coreut-1
echo "" && tree out-busybo-1
echo "" && tree out-coreut-2
echo "" && tree out-busybo-2

cd ..
```

And the output on my machine:

```
[kkocdko at klf busybox-report]$ ./test.sh
BusyBox v1.36.0 (2023-01-10 00:00:00 UTC) multi-call binary.
...

out-coreut-1

0 directories, 0 files

out-busybo-1
└── dir1
    └── dir2
        └── file3

3 directories, 1 file

out-coreut-2
└── dir1

2 directories, 0 files

out-busybo-2
└── dir1
    └── dir2
        └── file3

3 directories, 1 file
[kkocdko at klf busybox-report]$
```

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