From 692f9dbd32d1d0d541cff0674d1ab3dd689f362c Mon Sep 17 00:00:00 2001
From: Dan Snyder <snyderdan46@gmail.com>
Date: Sat, 18 Jan 2025 13:14:08 -0500
Subject: [PATCH] Get info on inactive LXCs

---
 src/lxcstat.c | 28 ++++++++++++++++++++++++++++
 src/lxcstat.h |  2 ++
 src/process.c |  9 +++++++--
 3 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/src/lxcstat.c b/src/lxcstat.c
index db93472..6aec139 100644
--- a/src/lxcstat.c
+++ b/src/lxcstat.c
@@ -1,5 +1,6 @@
 #include "lxcstat.h"
 
+#include <dirent.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -42,6 +43,32 @@ int readLxcConfig(lxcinfo *lxc, int lxcid) {
   return 0;
 }
 
+void getInactiveLXCs(lxcinfo **lxcs) {
+  struct dirent *pDirent;
+  DIR *pDir;
+
+  // Ensure we can open directory.
+  pDir = opendir("/etc/pve/lxc");
+  if (pDir == NULL) {
+    printf("Cannot open directory '/etc/pve/lxc'\n");
+    return;
+  }
+
+  // Process each entry.
+  while ((pDirent = readdir(pDir)) != NULL) {
+    char *fname = pDirent->d_name;
+    char extension[20];
+    int lxcid;
+
+    int argc = sscanf(fname, "%d.%s", &lxcid, (char *) extension);
+    // ensure it's an LXC config
+    if (argc != 2 || strcmp((char *) extension, "conf") != 0) continue;
+    getLXCInfo(lxcs, lxcid);  // don't care about result
+  }
+
+  closedir(pDir);
+}
+
 lxcinfo *getLXCInfo(lxcinfo **lxcs, int lxcid) {
   lxcinfo *lxc = *lxcs;
   while (lxc != NULL) {
@@ -51,6 +78,7 @@ lxcinfo *getLXCInfo(lxcinfo **lxcs, int lxcid) {
 
   lxc = calloc(1, sizeof(lxcinfo));
   lxc->lxcid = lxcid;
+  lxc->running = 0;
 
   if (readLxcConfig(lxc, lxcid)) {
     // failed to read LXC
diff --git a/src/lxcstat.h b/src/lxcstat.h
index 5032b1d..d42c1be 100644
--- a/src/lxcstat.h
+++ b/src/lxcstat.h
@@ -5,6 +5,7 @@ typedef struct _lxc_info {
   struct _lxc_info *next;
   struct _lxc_info *head;
   struct _lxc_info *tail;   // only valid for head lxcinfo
+  int running;
   int lxcid;
   int cpucount;
   int memlimit;
@@ -13,5 +14,6 @@ typedef struct _lxc_info {
 } lxcinfo;
 
 lxcinfo *getLXCInfo(lxcinfo **lxcs, int lxcid);
+void getInactiveLXCs(lxcinfo **lxcs);
 
 #endif
\ No newline at end of file
diff --git a/src/process.c b/src/process.c
index 0a7179c..642ef9a 100644
--- a/src/process.c
+++ b/src/process.c
@@ -318,8 +318,12 @@ char *readProcesses(char *procdir) {
     if (memcmp(cur->cpuset, lxcTag, strlen(lxcTag)) == 0) {
       // Resides in LXC -- read file and tag
       sscanf(cur->cpuset, "/lxc/%d/ns", &cur->lxc);
-      if (getLXCInfo(&lxcs, cur->lxc) == NULL) 
+      lxcinfo *lxc = getLXCInfo(&lxcs, cur->lxc);
+      if (lxc == NULL) {
         printf("Failed to read LXC config <%d>\n", cur->lxc);
+      } else {
+        lxc->running = 1;
+      }
     } else {
       cur->lxc = -1;
     }
@@ -336,7 +340,7 @@ nextProcess:
   
   linkFamily(head);
   aggregateStats(head);
-  // printFamilyTree(head);
+  getInactiveLXCs(&lxcs);
 
   int clocks = sysconf(_SC_CLK_TCK);
   char *output = malloc(8 * 1024 * 1024);
@@ -378,6 +382,7 @@ nextProcess:
     ptr += sprintf(ptr, "lxc_cpu_core_count{%s} %u\n", buffer, lxc->cpucount);
     ptr += sprintf(ptr, "lxc_memory_limit_bytes{%s} %llu\n", buffer, lxc->memlimit);
     ptr += sprintf(ptr, "lxc_swap_limit_bytes{%s} %llu\n", buffer, lxc->swaplimit);
+    ptr += sprintf(ptr, "lxc_is_running{%s} %d\n", buffer, lxc->running);
     // free and proceed
     lxcinfo *prev = lxc;
     lxc = lxc->next;