+ busybox --install [-s]

  is almost good to go.  Here is my work in progress.

+ Look at the FIXME in busybox.c
  to see what I need.  The actual (sym)linking is disabled
  for now, although I'm sure it works ;)
  (Am I going to have to dig through /proc to find
  out where the currently running busybox is sitting?)

+ I put an #ifdef BB_FEATURE_INSTALLER around
  the new bits of code in busybox.c, and I have a
  #define BB_FEATURE_INSTALLER in busybox.def.h
  towards the bottom.

3 files changed, 153 insertions, 0 deletions

diff --git a/applets/busybox.c b/applets/busybox.c
index 84629d218..78f07e338 100644
--- a/applets/busybox.c
+++ b/applets/busybox.c
@@ -358,6 +358,60 @@ const struct BB_applet applets[] = {
 };
 
 
+#ifdef BB_FEATURE_INSTALLER
+/* 
+ * directory table
+ *      this should be consistent w/ the enum, internal.h::Location,
+ *      or else...
+ */
+static char* install_dir[] = {
+    "/",
+    "/bin",
+    "/sbin",
+    "/usr/bin",
+    "/usr/sbin",
+        NULL
+};
+
+/* abstract link() */
+typedef int (*__link_f)(const char *, const char *);
+
+/* create (sym)links for each applet */
+int install_links(const char *busybox, int use_symbolic_links)
+{
+    __link_f Link = link;
+
+    char        command[256];
+        int             i;
+        int             rc = 0;
+
+        if (use_symbolic_links) Link = symlink;
+
+    for (i = 0; applets[i].name != NULL; i++) {
+        sprintf (
+                        command, 
+                        "%s/%s", 
+                        install_dir[applets[i].location], 
+                        applets[i].name
+                );
+#if 0
+        rc |= Link(busybox, command);
+#else
+        puts(command);
+#endif
+                if (rc) {
+                        fprintf(stderr,"busybox : %s : %s\n", command, strerror(errno));
+                        break;
+                }
+    }
+        return rc;
+}
+
+#if 0
+int uninstall_links() ?
+#endif
+#endif /* BB_FEATURE_INSTALLER */
+
 
 int main(int argc, char **argv)
 {
@@ -365,6 +419,26 @@ int main(int argc, char **argv)
         char                            *name;
         const struct BB_applet  *a              = applets;
 
+#ifdef BB_FEATURE_INSTALLER     
+        if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
+                int use_symbolic_links = 0;
+
+                /* to use symlinks, or to not use symlinks... */
+                if (argc > 2) {
+                        if ((strcmp(argv[2], "-s") == 0)) { 
+                                use_symbolic_links = 1; 
+                        }
+                }
+                /* 
+                 * FIXME : 
+                 * I need a clever unix trick that'll tell
+                 * me where to find the currently running
+                 * busybox binary
+                 */
+                return install_links("/bin/busybox", use_symbolic_links);
+        }
+#endif /* BB_FEATURE_INSTALLER */
+
         for (s = name = argv[0]; *s != '\0';) {
                 if (*s++ == '/')
                         name = s;
diff --git a/busybox.c b/busybox.c
index 84629d218..78f07e338 100644
--- a/busybox.c
+++ b/busybox.c
@@ -358,6 +358,60 @@ const struct BB_applet applets[] = {
 };
 
 
+#ifdef BB_FEATURE_INSTALLER
+/* 
+ * directory table
+ *      this should be consistent w/ the enum, internal.h::Location,
+ *      or else...
+ */
+static char* install_dir[] = {
+    "/",
+    "/bin",
+    "/sbin",
+    "/usr/bin",
+    "/usr/sbin",
+        NULL
+};
+
+/* abstract link() */
+typedef int (*__link_f)(const char *, const char *);
+
+/* create (sym)links for each applet */
+int install_links(const char *busybox, int use_symbolic_links)
+{
+    __link_f Link = link;
+
+    char        command[256];
+        int             i;
+        int             rc = 0;
+
+        if (use_symbolic_links) Link = symlink;
+
+    for (i = 0; applets[i].name != NULL; i++) {
+        sprintf (
+                        command, 
+                        "%s/%s", 
+                        install_dir[applets[i].location], 
+                        applets[i].name
+                );
+#if 0
+        rc |= Link(busybox, command);
+#else
+        puts(command);
+#endif
+                if (rc) {
+                        fprintf(stderr,"busybox : %s : %s\n", command, strerror(errno));
+                        break;
+                }
+    }
+        return rc;
+}
+
+#if 0
+int uninstall_links() ?
+#endif
+#endif /* BB_FEATURE_INSTALLER */
+
 
 int main(int argc, char **argv)
 {
@@ -365,6 +419,26 @@ int main(int argc, char **argv)
         char                            *name;
         const struct BB_applet  *a              = applets;
 
+#ifdef BB_FEATURE_INSTALLER     
+        if (argc > 1 && (strcmp(argv[1], "--install") == 0)) {
+                int use_symbolic_links = 0;
+
+                /* to use symlinks, or to not use symlinks... */
+                if (argc > 2) {
+                        if ((strcmp(argv[2], "-s") == 0)) { 
+                                use_symbolic_links = 1; 
+                        }
+                }
+                /* 
+                 * FIXME : 
+                 * I need a clever unix trick that'll tell
+                 * me where to find the currently running
+                 * busybox binary
+                 */
+                return install_links("/bin/busybox", use_symbolic_links);
+        }
+#endif /* BB_FEATURE_INSTALLER */
+
         for (s = name = argv[0]; *s != '\0';) {
                 if (*s++ == '/')
                         name = s;
diff --git a/busybox.def.h b/busybox.def.h
index 9742241c2..4c74910d7 100644
--- a/busybox.def.h
+++ b/busybox.def.h
@@ -230,6 +230,11 @@
 //#define BB_FEATURE_INSMOD_VERSION_CHECKING
 //
 //
+// Enable busybox --install [-s]
+// to create links (or symlinks) for all the commands that are 
+// compiled into the binary.
+#define BB_FEATURE_INSTALLER
+//
 // End of Features List
 //
 //