main/lxc: add fix for lxc-top with cgroup2

ref: #15607
upstream: https://github.com/lxc/lxc/pull/4439

main/lxc/APKBUILD

@@ -4,7 +4,7 @@
 pkgname=lxc
 pkgver=6.0.0
 _pkgver=${pkgver/_rc/.rc}
-pkgrel=2
+pkgrel=3
 pkgdesc="Userspace interface for the Linux kernel containment features"
 url="https://linuxcontainers.org/lxc/"
 arch="all"
@@ -37,6 +37,7 @@ subpackages="
 	$pkgname-user-nic:_user_nic
 	"
 source="https://linuxcontainers.org/downloads/lxc/lxc-$_pkgver.tar.gz
+	lxc-top-cgroupv2.patch
 	lxc.initd
 	lxc.confd
 	"
@@ -175,6 +176,7 @@ _user_nic() {
 
 sha512sums="
 acff2fc70cf2c65af37b70a21239482c3d845c408f7132558b54980e4400c23670c63178a3a3dfb239f047f529004df93cd829d728852a8c8647ce6babf7857f  lxc-6.0.0.tar.gz
+e7b7a443a71804f21e6225bed98310ccf2cad1a5bc2b9ad397e7d79fcfab6216e10ce02e249fbc0e6df2cfbe13e03320d9690db502027ae008a6f48218b81d17  lxc-top-cgroupv2.patch
 db71783366277a68a5c8116604cf845da4780fe4aebdb5820ae2c4fe028cfe52a9c94246db362476f2f195be6a9c2b835edbe521423f116fc66eb50023d6daab  lxc.initd
 91de43db5369a9e10102933514d674e9c875218a1ff2910dd882e5b9c308f9e430deacb13d1d7e0b2ed1ef682d0bb035aa6f8a6738f54fa2ca3a05acce04e467  lxc.confd
 "

main/lxc/lxc-top-cgroupv2.patch

+From ba823cc3cd2ea8b7eef714c317a212a9d7b5afe0 Mon Sep 17 00:00:00 2001
+From: Anoop Rachakonda <anooprac@utexas.edu>
+Date: Wed, 1 May 2024 13:56:30 -0500
+Subject: [PATCH] stats_get: Changed paths to be aligned with cgroup2
+ specifications
+
+Closes #4376
+
+Signed-off-by: Devon Schwartz <devon.s.schwartz@utexas.edu>
+---
+ src/lxc/tools/lxc_top.c | 64 ++++++++++++++++++++++++++++++++---------
+ 1 file changed, 51 insertions(+), 13 deletions(-)
+
+diff --git a/src/lxc/tools/lxc_top.c b/src/lxc/tools/lxc_top.c
+index aa6e7209e3..f27025f730 100644
+--- a/src/lxc/tools/lxc_top.c
++++ b/src/lxc/tools/lxc_top.c
+@@ -276,27 +276,33 @@ static uint64_t stat_match_get_int(struct lxc_container *c, const char *item,
+ 	Total 149327872
+ */
+ static void stat_get_blk_stats(struct lxc_container *c, const char *item,
+-			      struct blkio_stats *stats) {
++			      struct blkio_stats *stats, bool *success) {
+ 	char buf[4096];
+ 	int i, len;
+ 	char **lines, **cols;
++	*success = true; 
+ 
+ 	len = c->get_cgroup_item(c, item, buf, sizeof(buf));
+ 	if (len <= 0 || (size_t)len >= sizeof(buf)) {
+ 		fprintf(stderr, "Unable to read cgroup item %s\n", item);
++		*success = false; 
+ 		return;
+ 	}
+ 
+ 	lines = lxc_string_split_and_trim(buf, '\n');
+-	if (!lines)
++	if (!lines) {
++		*success = false; 
+ 		return;
++	}
+ 
+ 	memset(stats, 0, sizeof(struct blkio_stats));
+ 
+ 	for (i = 0; lines[i]; i++) {
+ 		cols = lxc_string_split_and_trim(lines[i], ' ');
+-		if (!cols)
++		if (!cols) {
++			*success = false; 
+ 			goto out;
++		}
+ 
+ 		if (strncmp(cols[1], "Read", strlen(cols[1])) == 0)
+ 			stats->read += strtoull(cols[2], NULL, 0);
+@@ -314,21 +320,53 @@ static void stat_get_blk_stats(struct lxc_container *c, const char *item,
+ 	return;
+ }
+ 
++static void try_cgroup2(struct lxc_container *c, u_int64_t *stat, const char* path_cgroup1, const char* path_cgroup2, 
++	const char* match, bool call_match) {
++	
++	int ret_cgroup2; 
++	
++	if (call_match) {
++		ret_cgroup2 = stat_match_get_int(c, path_cgroup2, match, 1); 
++		if (ret_cgroup2 < 0) {
++			*stat = stat_match_get_int(c, path_cgroup1, match, 1);
++		}
++		
++	} else {
++		ret_cgroup2 = stat_get_int(c, path_cgroup2); 
++		
++		if (ret_cgroup2 < 0) {
++			*stat = stat_get_int(c, path_cgroup1);
++		} else {
++			*stat = ret_cgroup2; 
++		}
++	}
++}
++
++
+ static void stats_get(struct lxc_container *c, struct container_stats *ct, struct stats *total)
+ {
+ 	ct->c = c;
+-	ct->stats->mem_used      = stat_get_int(c, "memory.usage_in_bytes");
+-	ct->stats->mem_limit     = stat_get_int(c, "memory.limit_in_bytes");
+-	ct->stats->memsw_used    = stat_get_int(c, "memory.memsw.usage_in_bytes");
+-	ct->stats->memsw_limit   = stat_get_int(c, "memory.memsw.limit_in_bytes");
++
++	// handle stat_get_int cases
++	try_cgroup2(c, &(ct->stats->mem_used), "memory.usage_in_bytes", "memory.current", NULL, false);
++	try_cgroup2(c, &(ct->stats->mem_limit), "memory.limit_in_bytes", "memory.max", NULL, false);
++	try_cgroup2(c, &(ct->stats->memsw_used), "memory.memsw.usage_in_bytes", "memory.swap.current", NULL, false);
++	try_cgroup2(c, &(ct->stats->memsw_limit), "memory.memsw.limit_in_bytes", "memory.swap.max", NULL, false);
++	try_cgroup2(c, &(ct->stats->cpu_use_nanos), "cpuacct.usage", "cpu.stat", NULL, false);
++	try_cgroup2(c, &(ct->stats->cpu_use_user), "cpuacct.stat", "cpu.stat", "user", true); 
++	try_cgroup2(c, &(ct->stats->cpu_use_sys), "cpuacct.stat", "cpu.stat", "system", true); 
++
++	// singular cgroup2 case for get blk stats
++	bool success; 
++	stat_get_blk_stats(c, "io.stat", &ct->stats->io_service_bytes, &success);
++	if (!success) {
++		stat_get_blk_stats(c, "blkio.throttle.io_service_bytes", &ct->stats->io_service_bytes, &success);
++	}
++
++	// paths only exist in cgroup1
+ 	ct->stats->kmem_used     = stat_get_int(c, "memory.kmem.usage_in_bytes");
+ 	ct->stats->kmem_limit    = stat_get_int(c, "memory.kmem.limit_in_bytes");
+-	ct->stats->cpu_use_nanos = stat_get_int(c, "cpuacct.usage");
+-	ct->stats->cpu_use_user  = stat_match_get_int(c, "cpuacct.stat", "user", 1);
+-	ct->stats->cpu_use_sys   = stat_match_get_int(c, "cpuacct.stat", "system", 1);
+-
+-	stat_get_blk_stats(c, "blkio.throttle.io_service_bytes", &ct->stats->io_service_bytes);
+-	stat_get_blk_stats(c, "blkio.throttle.io_serviced", &ct->stats->io_serviced);
++	stat_get_blk_stats(c, "blkio.throttle.io_serviced", &ct->stats->io_serviced, &success);
+ 
+ 	if (total) {
+ 		total->mem_used      = total->mem_used      + ct->stats->mem_used;