Use bash as login shell by default

[termux-packages] / ndk_patches / pwd.patch

diff -u -r /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/pwd.h ./usr/include/pwd.h
--- /home/fornwall/lib/android-ndk/platforms/android-21/arch-arm/usr/include/pwd.h	2014-10-14 22:53:49.000000000 -0400
+++ ./usr/include/pwd.h	2015-07-15 09:42:32.974621965 -0400
@@ -65,6 +65,9 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
+/* For access(): */
+#include <unistd.h>
+
 #define _PATH_PASSWD        "/etc/passwd"
 #define _PATH_MASTERPASSWD  "/etc/master.passwd"
 #define _PATH_MASTERPASSWD_LOCK "/etc/ptmp"
@@ -119,6 +122,41 @@
 int getpwnam_r(const char*, struct passwd*, char*, size_t, struct passwd**);
 int getpwuid_r(uid_t, struct passwd*, char*, size_t, struct passwd**);
 
+extern char *realpath(const char *path, char *resolved_path);
+extern void free(void *ptr);
+extern void *memcpy(void *dest, const void *src, size_t n);
+extern size_t strlen(const char *s);
+
+static void android_setup_pwd(struct passwd* pw) {
+       static char realpath_buffer[4096/*PATH_MAX*/];
+       char* result = realpath("@TERMUX_HOME@/.termux/shell", realpath_buffer);
+       if (result == NULL || access(realpath_buffer, X_OK) == -1) {
+		char const* bash_path = "@TERMUX_PREFIX@/bin/bash";
+		if (access(bash_path, X_OK) != -1) pw->pw_shell = bash_path;
+		else pw->pw_shell = "@TERMUX_PREFIX@/bin/ash";
+       } else {
+               pw->pw_shell = realpath_buffer;
+       }
+       pw->pw_dir = "@TERMUX_HOME@";
+       pw->pw_passwd = "*";
+}
+
+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;
+}
+
+#define getpwnam android_polyfill_getpwnam
+#define getpwuid android_polyfill_getpwuid
 void endpwent(void);
 struct passwd* getpwent(void);
 int setpwent(void);