This patch allows us to skip tests that require PTRACE_ATTACH in situations
where PTRACE_ATTACH is only allowed when CAP_SYS_PTRACE is held (i.e., for
root, by default.)

Reported at <https://bugzilla.redhat.com/show_bug.cgi?id=1210966>.

--- elfutils-0.161/tests/run-deleted.sh	2015-04-11 16:38:33.028556235 +0200
+++ elfutils-0.161/tests/run-deleted.sh	2015-04-11 16:46:15.012442185 +0200
@@ -17,6 +17,15 @@
 
 . $srcdir/backtrace-subr.sh
 
+# Check whether the Yama policy allows us to use PTRACE_ATTACH.
+if [ -f /proc/sys/kernel/yama/ptrace_scope ]
+then
+    if [ `cat /proc/sys/kernel/yama/ptrace_scope` -ne 0 ]
+    then
+	exit 77
+    fi
+fi
+
 tempfiles deleted deleted-lib.so
 cp -p ${abs_builddir}/deleted ${abs_builddir}/deleted-lib.so .
 
--- elfutils-0.161/tests/vdsosyms.c	2015-04-11 16:40:20.633461110 +0200
+++ elfutils-0.161/tests/vdsosyms.c	2015-04-11 16:45:06.611866677 +0200
@@ -23,6 +23,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <unistd.h>
 #include ELFUTILS_HEADER(dwfl)
 
@@ -68,6 +70,7 @@ module_callback (Dwfl_Module *mod, void
 int
 main (int argc __attribute__ ((unused)), char **argv __attribute__ ((unused)))
 {
+  static const char ptrace_scope_file[] = "/proc/sys/kernel/yama/ptrace_scope";
   static char *debuginfo_path;
   static const Dwfl_Callbacks proc_callbacks =
     {
@@ -76,6 +79,20 @@ main (int argc __attribute__ ((unused)),
 
       .find_elf = dwfl_linux_proc_find_elf,
     };
+
+  /* Check whether the Yama policy allows us to use PTRACE_ATTACH.  */
+  int ptrace_scope = open (ptrace_scope_file, O_RDONLY);
+  if (ptrace_scope >= 0)
+    {
+      char buf[10];
+      int count = read (ptrace_scope, buf, sizeof buf);
+      assert (count > 0);
+      if (buf[0] != '0')
+	/* We're not allowed, so skip this test.  */
+	return 77;
+      close (ptrace_scope);
+    }
+
   Dwfl *dwfl = dwfl_begin (&proc_callbacks);
   if (dwfl == NULL)
     error (2, 0, "dwfl_begin: %s", dwfl_errmsg (-1));
9839c58e505c4a210688c'>root</a>/<a href='/guix/log/tests?id=87ce159bc1db935df0f9839c58e505c4a210688c'>tests</a>/<a href='/guix/log/tests/cran.scm?id=87ce159bc1db935df0f9839c58e505c4a210688c'>cran.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/tests/cran.scm?id=87ce159bc1db935df0f9839c58e505c4a210688c&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-12-18 04:09:47 +0100'>2021-12-18</span></td><td><a href='/guix/commit/tests/cran.scm?id=10ceb3e84654e024f14a4b048e7d68492ed9dc7c'>import: cran: Fix description-&gt;package test.</a><span class='msg-avail'>...<span class='msg-tooltip'>This follows up on commit 5cd1019488c44081aaf030fbe8bc357d78daef23.

* tests/cran.scm (description): Include a very long line.
(description-&gt;package): Update the golden description to match the
paragraph filling now performed by BEAUTIFY-DESCRIPTION.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-07-11 00:49:16 +0200'>2021-07-11</span></td><td><a href='/guix/commit/tests/cran.scm?id=aa6921634b4ea9988af0e37bfbb56780c431ef64'>import: cran: Emit new-style package inputs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/import/cran.scm (format-inputs): Emit symbols or
'specification-&gt;package' calls.
(maybe-inputs): Wrap in 'list' instead of 'quasiquote'.
* tests/cran.scm ("description-&gt;package"): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>