From 5363b092986416b4ec99716bb2b309856ff22526 Mon Sep 17 00:00:00 2001
From: Elliott Hughes <enh@google.com>
Date: Thu, 27 Jun 2019 14:37:57 -0700
Subject: modinfo: various small fixes.

Improve Android support (see code comments).

Remove unnecessary fixed-length limits.

Show error if module not found (plus test).

Expand help text.

Switch to FLAG macro.

Stop hard-coding module assumptions in the tests.
---
 toys/other/modinfo.c | 43 ++++++++++++++++++++++++++++++-------------
 1 file changed, 30 insertions(+), 13 deletions(-)

(limited to 'toys')

diff --git a/toys/other/modinfo.c b/toys/other/modinfo.c
index eaf6cb98..286570f1 100644
--- a/toys/other/modinfo.c
+++ b/toys/other/modinfo.c
@@ -10,10 +10,14 @@ config MODINFO
   bool "modinfo"
   default y
   help
-    usage: modinfo [-0] [-b basedir] [-k kernrelease] [-F field] [modulename...]
+    usage: modinfo [-0] [-b basedir] [-k kernel] [-F field] [module|file...]
 
-    Display module fields for all specified modules, looking in
-    <basedir>/lib/modules/<kernrelease>/ (kernrelease defaults to uname -r).
+    Display module fields for modules specified by name or .ko path.
+
+    -F  Only show the given field
+    -0  Separate fields with NUL rather than newline
+    -b  Use <basedir> as root for /lib/modules/
+    -k  Look in given directory under /lib/modules/
 */
 
 #define FOR_modinfo
@@ -23,6 +27,7 @@ GLOBALS(
   char *F, *k, *b;
 
   long mod;
+  int count;
 )
 
 static void output_field(char *field, char *value)
@@ -30,7 +35,7 @@ static void output_field(char *field, char *value)
   if (!TT.F) xprintf("%s:%*c", field, 15-(int)strlen(field), ' ');
   else if (strcmp(TT.F, field)) return;
   xprintf("%s", value);
-  xputc((toys.optflags & FLAG_0) ? 0 : '\n');
+  xputc(FLAG(0) ? 0 : '\n');
 }
 
 static void modinfo_file(char *full_name)
@@ -53,6 +58,7 @@ static void modinfo_file(char *full_name)
     return;
   }
 
+  TT.count++;
   output_field("filename", full_name);
 
   for (pos = buf; pos < buf+len; pos++) {
@@ -100,19 +106,30 @@ static int check_module(struct dirtree *new)
 
 void modinfo_main(void)
 {
-  for(TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
+  struct utsname uts;
+
+  // Android (as shipped by Google) currently only has modules on /vendor.
+  // Android does not support multiple sets of modules for different kernels.
+  if (CFG_TOYBOX_ON_ANDROID) {
+   if (!TT.b) TT.b = "/vendor";
+   if (!TT.k) TT.k = "";
+  } else {
+   uname(&uts);
+   if (!TT.b) TT.b = "";
+   if (!TT.k) TT.k = uts.release;
+  }
+
+  for (TT.mod = 0; TT.mod<toys.optc; TT.mod++) {
     char *s = strstr(toys.optargs[TT.mod], ".ko");
 
     if (s && !s[3]) modinfo_file(toys.optargs[TT.mod]);
     else {
-      struct utsname uts;
-
-      if (uname(&uts) < 0) perror_exit("bad uname");
-      if (snprintf(toybuf, sizeof(toybuf), "%s/lib/modules/%s",
-          (toys.optflags & FLAG_b) ? TT.b : "",
-          (toys.optflags & FLAG_k) ? TT.k : uts.release) >= sizeof(toybuf))
-            perror_exit("basedir/kernrelease too long");
-      dirtree_read(toybuf, check_module);
+      char *path = xmprintf("%s/lib/modules/%s", TT.b, TT.k);
+
+      TT.count = 0;
+      dirtree_read(path, check_module);
+      if (!TT.count) error_msg("%s: not found", toys.optargs[TT.mod]);
+      free(path);
     }
   }
 }
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