diff options
Diffstat (limited to 'src/util.c')
| -rw-r--r-- | src/util.c | 66 |
1 files changed, 58 insertions, 8 deletions
diff --git a/src/util.c b/src/util.c index b2baa1ba29..38d630e6a0 100644 --- a/src/util.c +++ b/src/util.c @@ -3948,6 +3948,20 @@ int detect_vm(const char **id) { /* Returns a short identifier for the various VM/container implementations */ int detect_virtualization(const char **id) { int r; + static __thread const char *cached_id = NULL; + const char *_id; + FILE *f; + + if (cached_id) { + + if (cached_id == (const char*) -1) + return 0; + + if (id) + *id = cached_id; + + return 1; + } /* Unfortunately most of these operations require root access * in one way or another */ @@ -3955,24 +3969,60 @@ int detect_virtualization(const char **id) { return -EPERM; if ((r = running_in_chroot()) > 0) { - if (id) - *id = "chroot"; + _id = "chroot"; + r = 1; + goto finish; + } - return r; + if ((f = fopen("/proc/self/cgroup", "r"))) { + + for (;;) { + char line[LINE_MAX], *p; + + if (!fgets(line, sizeof(line), f)) + break; + + if (!(p = strchr(strstrip(line), ':'))) + continue; + + if (strncmp(p, ":ns:", 4)) + continue; + + if (!streq(p, ":ns:/")) { + fclose(f); + + r = 1; + _id = "ns"; + goto finish; + } + } + + fclose(f); } /* /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) { + _id = "openvz"; + r = 1; + goto finish; + } - if (id) - *id = "openvz"; + r = detect_vm(&_id); - return 1; - } +finish: + if (r < 0) + return r; + else if (r > 0) + cached_id = _id; + else + cached_id = (const char*) -1; - return detect_vm(id); + if (id) + *id = _id; + + return r; } void execute_directory(const char *directory, DIR *d, char *argv[]) { |