fix lfs missing bash

toolchain/bootstrap.sh

@@ -92,14 +92,17 @@ echo "  This will take a while (30-60+ minutes on 32 threads)."
 echo "  Logs will be in: ${LFS}/sources/logs/"
 echo ""
 
-# Run build-all.sh as the lfs user with a clean environment
-# The build scripts source darkforge-env.sh internally, so we just
-# need LFS set and the lfs user's PATH to find basic tools.
-su -l lfs -c "
-    export LFS=${LFS}
-    source ${LFS}/sources/darkforge-env.sh
-    bash ${SCRIPTS_DEST}/build-all.sh
-" || {
+# Run build-all.sh as the lfs user with a clean environment.
+# We use 'su' without -l to avoid the lfs .bash_profile which does
+# 'exec env -i /bin/bash' and would swallow our -c command.
+# Instead, we build the clean environment ourselves.
+env -i HOME=/home/lfs TERM="${TERM}" \
+    LFS="${LFS}" \
+    LC_ALL=POSIX \
+    LFS_TGT=x86_64-darkforge-linux-gnu \
+    PATH="${LFS}/tools/bin:/usr/bin" \
+    MAKEFLAGS="-j32" \
+    su lfs -s /bin/bash -c "bash ${SCRIPTS_DEST}/build-all.sh" || {
     fail "Build failed! Check logs in ${LFS}/sources/logs/"
 }