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Add wait-for-debugger test harness hooks

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If WAIT_FOR_DEBUGGER is set to a non-zero value in the environment,
any test that runs will print some useful gdb information and wait
for gdb to attach to it and clear the "wait_for_debugger" variable.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
DJ Delorie
2019-10-02 14:46:46 -04:00
parent acab05949f
commit 4052fa22f6
2 changed files with 75 additions and 0 deletions
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22
support/test-container.c
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@@ -676,6 +676,9 @@ main (int argc, char **argv)
char *so_base;
int do_postclean = 0;
int pipes[2];
char pid_buf[20];
uid_t original_uid;
gid_t original_gid;
/* If set, the test runs as root instead of the user running the testsuite. */
@@ -999,6 +1002,11 @@ main (int argc, char **argv)
if (chdir (new_cwd_path) < 0)
FAIL_EXIT1 ("Can't cd to new %s - ", new_cwd_path);
/* This is to pass the "outside" PID to the child, which will be PID
1. */
if (pipe2 (pipes, O_CLOEXEC) < 0)
FAIL_EXIT1 ("Can't create pid pipe");
/* To complete the containerization, we need to fork () at least
once. We can't exec, nor can we somehow link the new child to
our parent. So we run the child and propogate it's exit status
@@ -1010,6 +1018,12 @@ main (int argc, char **argv)
{
/* Parent. */
int status;
/* Send the child's "outside" pid to it. */
write (pipes[1], &child, sizeof(child));
close (pipes[0]);
close (pipes[1]);
waitpid (child, &status, 0);
if (WIFEXITED (status))
@@ -1028,6 +1042,14 @@ main (int argc, char **argv)
/* The rest is the child process, which is now PID 1 and "in" the
new root. */
/* Get our "outside" pid from our parent. We use this to help with
debugging from outside the container. */
read (pipes[0], &child, sizeof(child));
close (pipes[0]);
close (pipes[1]);
sprintf (pid_buf, "%lu", (long unsigned)child);
setenv ("PID_OUTSIDE_CONTAINER", pid_buf, 0);
maybe_xmkdir ("/tmp", 0755);
/* Now that we're pid 1 (effectively "root") we can mount /proc */