From c8ab9926132085f2daf6b949cafda43378d50fb5 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 28 Feb 2024 13:00:54 -0500
Subject: stat: Use errno_is_like(ENOSYS) for EPERM kludge

---
 src/bfstd.c | 4 ++++
 src/stat.c  | 4 +---
 2 files changed, 5 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/bfstd.c b/src/bfstd.c
index d19049f..ce4aa49 100644
--- a/src/bfstd.c
+++ b/src/bfstd.c
@@ -45,6 +45,10 @@ bool error_is_like(int error, int category) {
 	case ENOENT:
 		return error == ENOTDIR;
 
+	case ENOSYS:
+		// https://github.com/opencontainers/runc/issues/2151
+		return errno == EPERM;
+
 #if __DragonFly__
 	// https://twitter.com/tavianator/status/1742991411203485713
 	case ENAMETOOLONG:
diff --git a/src/stat.c b/src/stat.c
index 36222cb..2f2743b 100644
--- a/src/stat.c
+++ b/src/stat.c
@@ -253,9 +253,7 @@ static int bfs_stat_explicit(int at_fd, const char *at_path, int at_flags, struc
 
 	if (load(&has_statx, relaxed)) {
 		int ret = bfs_statx_impl(at_fd, at_path, at_flags, buf);
-		// EPERM is commonly returned in a seccomp() sandbox that does
-		// not allow statx()
-		if (ret != 0 && (errno == ENOSYS || errno == EPERM)) {
+		if (ret != 0 && errno_is_like(ENOSYS)) {
 			store(&has_statx, false, relaxed);
 		} else {
 			return ret;
-- 
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