From 9f90d09fcf58269dc09bad90b360d46c374e56e9 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Wed, 10 Apr 2024 10:03:15 -0400
Subject: build: Add optional libselinux dependency

---
 Makefile            |  6 +++++-
 config/libselinux.c |  6 ++++++
 config/pkgconf.sh   |  3 +++
 docs/BUILDING.md    | 14 ++++++++------
 4 files changed, 22 insertions(+), 7 deletions(-)
 create mode 100644 config/libselinux.c

diff --git a/Makefile b/Makefile
index 326ee87..ed59126 100644
--- a/Makefile
+++ b/Makefile
@@ -143,6 +143,7 @@ export RELEASE_CFLAGS= -O3 -flto=auto
 #     $ make config USE_LIBURING=n USE_ONIGURUMA=y
 USE_LIBACL ?=
 USE_LIBCAP ?=
+USE_LIBSELINUX ?=
 USE_LIBURING ?=
 USE_ONIGURUMA ?=
 
@@ -167,6 +168,7 @@ _XLDLIBS := ${LDLIBS}
 
 _XUSE_LIBACL := ${USE_LIBACL}
 _XUSE_LIBCAP := ${USE_LIBCAP}
+_XUSE_LIBSELINUX := ${USE_LIBSELINUX}
 _XUSE_LIBURING := ${USE_LIBURING}
 _XUSE_ONIGURUMA := ${USE_ONIGURUMA}
 
@@ -197,6 +199,7 @@ export XLDLIBS=${_XLDLIBS}
 
 export XUSE_LIBACL=${_XUSE_LIBACL}
 export XUSE_LIBCAP=${_XUSE_LIBCAP}
+export XUSE_LIBSELINUX=${_XUSE_LIBSELINUX}
 export XUSE_LIBURING=${_XUSE_LIBURING}
 export XUSE_ONIGURUMA=${_XUSE_ONIGURUMA}
 
@@ -210,6 +213,7 @@ CONFIG := ${GEN}/config.mk
 PKGS := \
     ${GEN}/libacl.mk \
     ${GEN}/libcap.mk \
+    ${GEN}/libselinux.mk \
     ${GEN}/liburing.mk \
     ${GEN}/oniguruma.mk
 
@@ -478,7 +482,7 @@ distcheck: ${DISTCHECKS}
 DISTCHECK_CONFIG_asan := ASAN=y UBSAN=y
 DISTCHECK_CONFIG_msan := MSAN=y UBSAN=y CC=clang
 DISTCHECK_CONFIG_tsan := TSAN=y UBSAN=y CC=clang
-DISTCHECK_CONFIG_m32 := EXTRA_CFLAGS="-m32" PKG_CONFIG_PATH=/usr/lib32/pkgconfig USE_LIBURING=n
+DISTCHECK_CONFIG_m32 := EXTRA_CFLAGS="-m32" PKG_CONFIG_LIBDIR=/usr/lib32/pkgconfig USE_LIBURING=n
 DISTCHECK_CONFIG_release := RELEASE=y
 
 ${DISTCHECKS}::
diff --git a/config/libselinux.c b/config/libselinux.c
new file mode 100644
index 0000000..72f5d33
--- /dev/null
+++ b/config/libselinux.c
@@ -0,0 +1,6 @@
+#include <selinux/selinux.h>
+
+int main(void) {
+	freecon(0);
+	return 0;
+}
diff --git a/config/pkgconf.sh b/config/pkgconf.sh
index 070fad6..286c19c 100755
--- a/config/pkgconf.sh
+++ b/config/pkgconf.sh
@@ -37,6 +37,9 @@ else
             libcap)
                 LDLIB=-lcap
                 ;;
+            libselinux)
+                LDLIB=-lselinux
+                ;;
             liburing)
                 LDLIB=-luring
                 ;;
diff --git a/docs/BUILDING.md b/docs/BUILDING.md
index 072da92..4ed139c 100644
--- a/docs/BUILDING.md
+++ b/docs/BUILDING.md
@@ -74,15 +74,17 @@ Here are some of the common ones; check the [`Makefile`](/Makefile) for more.
 `bfs` depends on some system libraries for some of its features.
 These dependencies are optional, and can be turned off in `make config` if necessary by setting the appropriate variable to `n` (e.g. `make config USE_ONIGURUMA=n`).
 
-| Dependency  | Platforms  | `make config` flag |
-|-------------|------------|--------------------|
-| [libacl]    | Linux only | `USE_LIBACL`       |
-| [libcap]    | Linux only | `USE_LIBCAP`       |
-| [liburing]  | Linux only | `USE_LIBURING`     |
-| [Oniguruma] | All        | `USE_ONIGURUMA`    |
+| Dependency   | Platforms  | `make config` flag |
+|--------------|------------|--------------------|
+| [libacl]     | Linux only | `USE_LIBACL`       |
+| [libcap]     | Linux only | `USE_LIBCAP`       |
+| [liburing]   | Linux only | `USE_LIBURING`     |
+| [libselinux] | Linux only | `USE_LIBSELINUX`   |
+| [Oniguruma]  | All        | `USE_ONIGURUMA`    |
 
 [libacl]: https://savannah.nongnu.org/projects/acl
 [libcap]: https://sites.google.com/site/fullycapable/
+[libselinux]: https://github.com/SELinuxProject/selinux
 [liburing]: https://github.com/axboe/liburing
 [Oniguruma]: https://github.com/kkos/oniguruma
 
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