Relocate functions helpers.c -> util.c

The file helpers.c should strictly only be used for misc. helper
functions to the main Finit daemon.  The functions moved in this
commit are generic enough to be used by any deamon or programs,
and for that we have util.c

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/util.h

@@ -55,11 +55,21 @@ extern char *prognm;
 # include <lite/conio.h>
 # include <lite/lite.h>
 #endif
+#include "log.h"
 
 char *progname     (char *arg0);
 const char *basenm (const char *path);
 
 char *str          (char *fmt, ...)                        __attribute__ ((format (printf, 1, 2)));
+
+int   getuser      (char *username, char **home);
+int   getgroup     (char *group);
+
+int   getcuser     (char *buf, size_t len);
+int   getcgroup    (char *buf, size_t len);
+
+int   mksubsys     (const char *dir, mode_t mode, char *user, char *group);
+
 int   fnread       (char *buf, size_t len, char *fmt, ...) __attribute__ ((format (printf, 3, 4)));
 int   fnwrite      (char *value, char *fmt, ...)           __attribute__ ((format (printf, 2, 3)));
 int   fngetint     (char *path, int *val);
@@ -94,6 +104,57 @@ int     ttcooked   (void);
 #define ttcooked() 0
 #endif
 
+/*
+ * Defaults to user "root" and group "wheel" (root) if:
+ *   1) the user is missing
+ *   2) the group or the file /etc/group is missing
+ */
+static inline int create(char *path, mode_t mode, char *user, char *group)
+{
+	int fd, uid, gid;
+
+	if (!path) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	uid = getuser(user, NULL);
+	if (uid < 0)
+		uid = 0;
+	gid = getgroup(group);
+	if (gid < 0)
+		gid = 0;
+
+	fd = creat(path, mode);
+	if (fd == -1) {
+		warn("Failed creating %s properly", path);
+		return -1;
+	}
+	close(fd);
+	if (chown(path, uid, gid)) {
+		warn("Failed chowning %s properly", path);
+		return -1;
+	}
+
+	return 0;
+}
+
+static inline int ln(const char *target, const char *linkpath)
+{
+	if (!target || !linkpath) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (symlink(target, linkpath)) {
+		if (errno != EEXIST)
+			warn("Failed creating %s -> %s symlink", target, linkpath);
+		return -1;
+	}
+
+	return 0;
+}
+
 static inline char *strterm(char *str, size_t len)
 {
 	str[len - 1] = 0;