Rename the pam binding files as requested

Also fix the Makefile to generate the bindings.

Makefile

@@ -2,18 +2,23 @@ PAM_SRC_DIR = src/pam
 
 BINDGEN_CMD = bindgen --allowlist-function '^pam_.*$$' --allowlist-var '^PAM_.*$$' --opaque-type pam_handle_t --blocklist-function pam_vsyslog --blocklist-function pam_vprompt --blocklist-function pam_vinfo --blocklist-function pam_verror --blocklist-type '.*va_list.*' --ctypes-prefix libc --no-layout-tests --sort-semantically
 
+PAM_VARIANT = $$(./get-pam-variant.bash)
+
 .PHONY: all clean pam-sys pam-sys-diff
 
 pam-sys-diff:
-	@$(BINDGEN_CMD) $< | diff --color=auto $(PAM_SRC_DIR)/sys.rs - || (echo run \'make -B pam-sys\' to apply these changes && false)
-	@echo $(PAM_SRC_DIR)/sys.rs does not need to be re-generated
+	@$(BINDGEN_CMD) $(PAM_SRC_DIR)/wrapper.h | \
+		sed 's/rust-bindgen [0-9]*\.[0-9]*\.[0-9]*/&, minified by cargo-minify/' | \
+		diff --color=auto $(PAM_SRC_DIR)/sys_$(PAM_VARIANT).rs - \
+		|| (echo run \'make -B pam-sys\' to apply these changes && false)
+	@echo $(PAM_SRC_DIR)/sys_$(PAM_VARIANT).rs does not need to be re-generated
 
 # use 'make pam-sys' to re-generate the sys.rs file for your local platform
 pam-sys:
-	$(BINDGEN_CMD) $(PAM_SRC_DIR)/wrapper.h --output $(PAM_SRC_DIR)/sys_$$(uname | tr 'A-Z' 'a-z').rs
+	$(BINDGEN_CMD) $(PAM_SRC_DIR)/wrapper.h --output $(PAM_SRC_DIR)/sys_$(PAM_VARIANT).rs
 	cargo minify --apply --allow-dirty
-	sed -i.bak 's/rust-bindgen [0-9]*\.[0-9]*\.[0-9]*/&, minified by cargo-minify/' $(PAM_SRC_DIR)/sys_$$(uname | tr 'A-Z' 'a-z').rs
-	rm $(PAM_SRC_DIR)/sys_$$(uname | tr 'A-Z' 'a-z').rs.bak
+	sed -i.bak 's/rust-bindgen [0-9]*\.[0-9]*\.[0-9]*/&, minified by cargo-minify/' $(PAM_SRC_DIR)/sys_$(PAM_VARIANT).rs
+	rm $(PAM_SRC_DIR)/sys_$(PAM_VARIANT).rs.bak
 
 clean:
 	rm $(PAM_SRC_DIR)/sys.rs

get-pam-variant.bash

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+# FIXME read headers to find the actually used variant
+case $(uname) in
+Linux)
+    echo linuxpam
+    ;;
+FreeBSD)
+    echo openpam
+    ;;
+*)
+    echo "Unsupported platform"
+    exit 1
+    ;;
+esac

src/pam/mod.rs

@@ -16,8 +16,8 @@ mod error;
 mod rpassword;
 mod securemem;
 
-#[cfg_attr(target_os = "linux", path = "sys_linux.rs")]
-#[cfg_attr(target_os = "freebsd", path = "sys_freebsd.rs")]
+#[cfg_attr(target_os = "linux", path = "sys_linuxpam.rs")]
+#[cfg_attr(target_os = "freebsd", path = "sys_openpam.rs")]
 #[allow(nonstandard_style)]
 pub mod sys;