termux-packages/ndk-patches/pwd.h.patch

diff -u -r /home/fornwall/lib/android-ndk/sysroot/usr/include/pwd.h ./usr/include/pwd.h
--- /home/fornwall/lib/android-ndk/sysroot/usr/include/pwd.h	2017-06-20 17:41:56.000000000 +0200
+++ ./usr/include/pwd.h	2017-06-26 11:45:26.036064547 +0200
@@ -63,6 +63,8 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
+#include <stdlib.h> /* For realpath() */
+
 __BEGIN_DECLS
 
 struct passwd {
@@ -89,7 +91,6 @@
 struct passwd* getpwent(void) __INTRODUCED_IN(26);
 
 void setpwent(void) __INTRODUCED_IN(26);
-void endpwent(void) __INTRODUCED_IN(26);
 #endif /* __ANDROID_API__ >= 26 */
 
 
@@ -99,6 +100,54 @@
 int getpwuid_r(uid_t, struct passwd*, char*, size_t, struct passwd**) __INTRODUCED_IN(12);
 #endif /* __ANDROID_API__ >= 12 */
 
+int access(const char* __path, int __mode);
+
+static void android_setup_pwd(struct passwd* pw) {
+	static char realpath_buffer[4096/*PATH_MAX*/];
+	char* result = realpath("/data/data/com.termux/files/home/.termux/shell", realpath_buffer);
+	if (result == NULL || access(realpath_buffer, /*X_OK*/1) == -1) {
+		char const* bash_path = "/data/data/com.termux/files/usr/bin/bash";
+		if (access(bash_path, /*X_OK*/1) != -1) pw->pw_shell = (char*) bash_path;
+		else pw->pw_shell = "/data/data/com.termux/files/usr/bin/sh";
+	} else {
+		pw->pw_shell = realpath_buffer;
+	}
+	pw->pw_dir = "/data/data/com.termux/files/home";
+	pw->pw_passwd = "*";
+#ifdef __LP64__
+	pw->pw_gecos = ""; /* Avoid NULL field. */
+#endif
+}
+
+static struct passwd* android_polyfill_getpwuid(uid_t t) {
+       struct passwd* pw = getpwuid(t);
+       if (pw == NULL) return NULL;
+       android_setup_pwd(pw);
+       return pw;
+}
+
+static struct passwd* android_polyfill_getpwnam(const char* name) {
+       struct passwd* pw = getpwnam(name);
+       if (pw == NULL) return NULL;
+       android_setup_pwd(pw);
+       return pw;
+}
+
+static int android_polyfill_getpwuid_r(uid_t uid,
+                                       struct passwd *pwd,
+                                       char *buffer,
+                                       size_t bufsize,
+                                       struct passwd **result) {
+       int ret = getpwuid_r(uid, pwd, buffer, bufsize, result);
+       if (ret != 0) return ret;
+       android_setup_pwd(pwd);
+       return 0;
+}
+
+#define getpwnam android_polyfill_getpwnam
+#define getpwuid android_polyfill_getpwuid
+#define getpwuid_r android_polyfill_getpwuid_r
+static void endpwent(void) { /* Do nothing. */ }
 
 __END_DECLS