Skip tests that rely on unlinkat(2) behavior that varies between
kernel versions and is unspecified.

See <http://bugs.gnu.org/20597>
and <http://lists.gnu.org/archive/html/bug-tar/2015-06/msg00000.html>.

--- tar-1.28/tests/testsuite	2014-07-27 22:35:27.000000000 +0200
+++ tar-1.28/tests/testsuite	2015-06-16 00:21:16.906380739 +0200
@@ -34680,6 +34680,7 @@ find .
 )"
 at_fn_check_prepare_notrace 'an embedded newline' "remfiles08a.at:31"
 ( $at_check_trace;
+exit 77
 mkdir gnu
 (cd gnu
 TEST_TAR_FORMAT=gnu
@@ -34762,6 +34763,7 @@ find .
 )"
 at_fn_check_prepare_notrace 'an embedded newline' "remfiles08b.at:36"
 ( $at_check_trace;
+exit 77
 mkdir gnu
 (cd gnu
 TEST_TAR_FORMAT=gnu
@@ -34850,6 +34852,7 @@ find .
 )"
 at_fn_check_prepare_notrace 'a `...` command substitution' "remfiles08c.at:31"
 ( $at_check_trace;
+exit 77
 mkdir gnu
 (cd gnu
 TEST_TAR_FORMAT=gnu
/td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>refs</a><a class='active' href='/guix/log/gnu/tests.scm'>log</a><a href='/guix/tree/gnu/tests.scm?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>tree</a><a href='/guix/commit/gnu/tests.scm?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>commit</a><a href='/guix/diff/gnu/tests.scm?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/tests.scm'>
<input type='hidden' name='id' value='e66f81cf63902bd99f5461af13616a9f4e03f450'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>root</a>/<a href='/guix/log/gnu?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>gnu</a>/<a href='/guix/log/gnu/tests.scm?id=e66f81cf63902bd99f5461af13616a9f4e03f450'>tests.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests.scm?id=e66f81cf63902bd99f5461af13616a9f4e03f450&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-05 16:33:37 +0100'>2020-03-05</span></td><td><a href='/guix/commit/gnu/tests.scm?id=c0b726c2112e0e670dc134583b376541c0a3789a'>tests: Add &lt;system-test&gt; gexp compiler.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests.scm (compile-system-test): New gexp compiler.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-01-23 11:26:55 +0100'>2020-01-23</span></td><td><a href='/guix/commit/gnu/tests.scm?id=f79313b3871ebe204c7b29fdb823666af06f48ff'>tests: Fix typo in comment.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests.scm: Add missing word in commentary.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-12-18 22:36:37 +0100'>2019-12-18</span></td><td><a href='/guix/commit/gnu/tests.scm?id=ab7010af1f1077c056529769a53a380147c3933f'>gexp: Allow character literals in GEXP-&gt;SEXP.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/38628&gt;.

* tests/gexp.scm ("lower-gexp, character literal"): New test.
* guix/gexp.scm (gexp-&gt;sexp)[self-quoting?]: Add CHAR? to the tested types.
* guix/repl.scm (self-quoting?): Likewise.
* gnu/tests.scm (marionette-shepherd-service)[self-quoting?]: Likewise.
</span></span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2019-09-23 23:41:19 +0200'>2019-09-23</span></td><td><a href='/guix/commit/gnu/tests.scm?id=7abd5997f41fec38ea1daa9099a9693062f10dbc'>repl, marionette: 'self-quoting?' matches keywords.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/repl.scm (self-quoting?): Add 'keyword?' and 'array?'; remove
'vector?' and 'bytevector?'.
* gnu/tests.scm (marionette-shepherd-service) &lt;start&gt;: Likewise.
&lt;modules&gt;: Remove (rnrs bytevector).
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-03-25 23:37:06 +0100'>2019-03-25</span></td><td><a href='/guix/commit/gnu/tests.scm?id=cf848cc0a17a3a58d600116896f6e7abfb0440d4'>accounts: Add default value for the 'home-directory' field of &lt;user-account&gt;.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/accounts.scm (&lt;user-account&gt;)[home-directory]: Mark as
thunked and add a default value.
(default-home-directory): New procedure.
* doc/guix.texi (User Accounts): Remove 'home-directory' from example.
* gnu/system/examples/bare-bones.tmpl: Likewise.
* gnu/system/examples/beaglebone-black.tmpl: Likewise.
* gnu/system/examples/desktop.tmpl: Likewise.
* gnu/system/examples/docker-image.tmpl: Likewise.
* gnu/system/examples/lightweight-desktop.tmpl: Likewise.
* gnu/system/install.scm (installation-os): Likewise.
* gnu/tests.scm (%simple-os): Likewise.
* gnu/tests/install.scm (%minimal-os, %minimal-os-on-vda):
(%separate-home-os, %encrypted-root-os, %btrfs-root-os): Likewise.
* tests/accounts.scm ("allocate-passwd")
("allocate-passwd with previous state"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>