[Bug-tar] testsuite bug in 1.15.1 ignfail.at

[Eric Blake]

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tests/ignfail.at wants to skip for the super-user, but instead skips if /
is writeable by the current user.  But in cygwin installations, / often is
writeable by the current user, even though they do not have super-user
priveleges, and the test is being skipped when it need not be.  The check
for skipping the test should be altered to come up with a more accurate
check for super-user (perhaps by trying to create a subdirectory,
stripping access rights, then seeing if the directory is still readable).

Meanwhile, while trying to experiment with what changes would make the
test run on cygwin, I found that the 1.15.1 tarball is incomplete:

make[2]: Entering directory `/home/eblake/tar-1.15.1/tests'
/bin/sh /home/eblake/tar-1.15.1/config/missing --run autom4te
- --language=autotest -I . testsuite.at -o testsuite.tmp
testsuite.at:67: /usr/bin/m4: Cannot open append.at: No such file or directory
autom4te-2.5x: /usr/bin/m4 failed with exit status: 1
make[2]: *** [testsuite] Error 1

Any reason why tests/Makefile.am omits append.at from TESTSUITE_AT?

- --
Life is short - so eat dessert first!

Eric Blake             address@hidden
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