Hi all, I believe I've found a very surprising behavior with GNU tar 1.29 and signal handling. I've attached a testcase tar file. Note that this tar file, while very small, CREATES A VERY LARGE FILE (1 gig). This is to aid in timing. All files are owned by 0:0 (root/wheel on my system).
% sudo gtar jtvf testcase-gnu-tar-bug.tar.bz2
drwxr-xr-x root/wheel 0 2017-03-02 16:10 testcase-gnu-tar-bug/
drwxr-xr-x root/wheel 0 2017-03-02 16:17
testcase-gnu-tar-bug/dir1/
-rw-r--r-- root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/dir1/file
-rw-r--r-- root/wheel 0 2017-03-02 15:55
testcase-gnu-tar-bug/file1
lrwxr-xr-x root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/file2 -> /var/somewhere
-rw-r--r-- root/wheel 1073741824 2017-03-02 16:10
testcase-gnu-tar-bug/file3
TEST CASE 1 is, in my opinion, pretty broken. I've tried a lot of
different command-line options trying to adjust the behavior with very
little luck. Am I missing something??
TEST CASE 2 and TEST CASE 3 are, in my opinion, acting as expected.
My system: OS X 10.12.3 with GNU tar 1.29 installed via homebrew but I
have verified this with GNU tar 1.29 on Arch Linux as well.
=====
TEST CASE 1
I hit ctrl-c while it is extracting the final file.
% sudo rm -fr testcase-gnu-tar-bug ; bunzip2
testcase-gnu-tar-bug.tar.bz2 | sudo gtar -xvvf -
drwxr-xr-x root/wheel 0 2017-03-02 16:10 testcase-gnu-tar-bug/
drwxr-xr-x root/wheel 0 2017-03-02 16:17
testcase-gnu-tar-bug/dir1/
-rw-r--r-- root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/dir1/file
-rw-r--r-- root/wheel 0 2017-03-02 15:55
testcase-gnu-tar-bug/file1
lrwxr-xr-x root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/file2 -> /var/somewhere
-rw-r--r-- root/wheel 1073741824 2017-03-02 16:10
testcase-gnu-tar-bug/file3
^C
% sudo ls -lsa testcase-gnu-tar-bug
total 184816
0 drwx------ 6 root staff 204 Mar 2 16:21 .
0 drwx------+ 6 aeruder staff 204 Mar 2 16:21 ..
0 drwxr-xr-x 3 root wheel 102 Mar 2 16:17 dir1
0 -rw-r--r-- 1 root wheel 0 Mar 2 15:55 file1
0 ---------- 1 root staff 0 Mar 2 16:21 file2
184816 -rw------- 1 root staff 94624768 Mar 2 16:21 file3
Note that:
1.) parent dir has wrong permissions and wrong ownership (BAD)
2.) file2 has wrong permissions, wrong file type, wrong ownership (BAD)
3.) file3 has wrong permissions, wrong ownership (OK)
====
TEST CASE 2
Everything runs normal, no ctrl-c
% sudo rm -fr testcase-gnu-tar-bug ; bunzip2 <
testcase-gnu-tar-bug.tar.bz2 | sudo gtar -xvvf -
drwxr-xr-x root/wheel 0 2017-03-02 16:10 testcase-gnu-tar-bug/
drwxr-xr-x root/wheel 0 2017-03-02 16:17
testcase-gnu-tar-bug/dir1/
-rw-r--r-- root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/dir1/file
-rw-r--r-- root/wheel 0 2017-03-02 15:55
testcase-gnu-tar-bug/file1
lrwxr-xr-x root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/file2 -> /var/somewhere
-rw-r--r-- root/wheel 1073741824 2017-03-02 16:10
testcase-gnu-tar-bug/file3
% sudo ls -lsa testcase-gnu-tar-bug
total 2097160
0 drwxr-xr-x 6 root wheel 204 Mar 2 16:10 .
0 drwx------+ 6 aeruder staff 204 Mar 2 16:27 ..
0 drwxr-xr-x 3 root wheel 102 Mar 2 16:17 dir1
0 -rw-r--r-- 1 root wheel 0 Mar 2 15:55 file1
8 lrwxr-xr-x 1 root wheel 14 Mar 2 16:10 file2 ->
/var/somewhere
2097152 -rw-r--r-- 1 root wheel 1073741824 Mar 2 16:10 file3
====
TEST CASE 3
Kill the 'bunzip2' process while gnu tar is running. I used pkill -n
bunzip2 from another terminal.
% sudo rm -fr testcase-gnu-tar-bug ; bunzip2 <
testcase-gnu-tar-bug.tar.bz2 | sudo gtar -xvvf -
drwxr-xr-x root/wheel 0 2017-03-02 16:10 testcase-gnu-tar-bug/
drwxr-xr-x root/wheel 0 2017-03-02 16:17
testcase-gnu-tar-bug/dir1/
-rw-r--r-- root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/dir1/file
-rw-r--r-- root/wheel 0 2017-03-02 15:55
testcase-gnu-tar-bug/file1
lrwxr-xr-x root/wheel 0 2017-03-02 16:10
testcase-gnu-tar-bug/file2 -> /var/somewhere
-rw-r--r-- root/wheel 1073741824 2017-03-02 16:10
testcase-gnu-tar-bug/file3
gtar: Unexpected EOF in archive
gtar: Unexpected EOF in archive
gtar: Error is not recoverable: exiting now
[1] 33786 terminated bunzip2 < testcase-gnu-tar-bug.tar.bz2
% sudo ls -lsa testcase-gnu-tar-bug
total 579784
0 drwxr-xr-x 6 root wheel 204 Mar 2 16:10 .
0 drwx------+ 6 aeruder staff 204 Mar 2 16:34 ..
0 drwxr-xr-x 3 root wheel 102 Mar 2 16:17 dir1
0 -rw-r--r-- 1 root wheel 0 Mar 2 15:55 file1
8 lrwxr-xr-x 1 root wheel 14 Mar 2 16:10 file2 ->
/var/somewhere
579776 -rw------- 1 root staff 296842240 Mar 2 16:34 file3
Note that:
1.) file3 has wrong permissions, wrong ownership (OK)
--
Andrew Ruder
a...@aeruder.net
testcase-gnu-tar-bug.tar.bz2
Description: BZip2 compressed data
