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virt: debug log on unexpected error conditions

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Let's make this more debuggable by logging if we look for something and
get any error other than ENOENT back.
This commit is contained in:
Lennart Poettering 2021-01-11 21:08:51 +01:00
parent a7e508f899
commit b7ec9e719b
1 changed files with 26 additions and 10 deletions
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36
src/basic/virt.c
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@ -464,16 +464,23 @@ int detect_container(void) {
return cached_found;
/* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */
if (access("/proc/vz", F_OK) >= 0 &&
access("/proc/bc", F_OK) < 0) {
r = VIRTUALIZATION_OPENVZ;
goto finish;
if (access("/proc/vz", F_OK) < 0) {
if (errno != ENOENT)
log_debug_errno(errno, "Failed to check if /proc/vz exists, ignoring: %m");
} else if (access("/proc/bc", F_OK) < 0) {
if (errno == ENOENT) {
r = VIRTUALIZATION_OPENVZ;
goto finish;
}
log_debug_errno(errno, "Failed to check if /proc/bc exists, ignoring: %m");
}
/* "Official" way of detecting WSL https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364 */
r = read_one_line_file("/proc/sys/kernel/osrelease", &o);
if (r >= 0 &&
(strstr(o, "Microsoft") || strstr(o, "WSL"))) {
if (r < 0)
log_debug_errno(r, "Failed to read /proc/sys/kernel/osrelease, ignoring: %m");
else if (strstr(o, "Microsoft") || strstr(o, "WSL")) {
r = VIRTUALIZATION_WSL;
goto finish;
}
@ -482,14 +489,23 @@ int detect_container(void) {
* invocation without worrying about it being elsewhere.
*/
r = get_proc_field("/proc/self/status", "TracerPid", WHITESPACE, &p);
if (r == 0 && !streq(p, "0")) {
if (r < 0)
log_debug_errno(r, "Failed to read our own trace PID, ignoring: %m");
else if (!streq(p, "0")) {
pid_t ptrace_pid;
r = parse_pid(p, &ptrace_pid);
if (r == 0) {
const char *pf = procfs_file_alloca(ptrace_pid, "comm");
if (r < 0)
log_debug_errno(r, "Failed to parse our own tracer PID, ignoring: %m");
else {
_cleanup_free_ char *ptrace_comm = NULL;
const char *pf;
pf = procfs_file_alloca(ptrace_pid, "comm");
r = read_one_line_file(pf, &ptrace_comm);
if (r >= 0 && startswith(ptrace_comm, "proot")) {
if (r < 0)
log_debug_errno(r, "Failed to read %s, ignoring: %m", pf);
else if (startswith(ptrace_comm, "proot")) {
r = VIRTUALIZATION_PROOT;
goto finish;
}