ash: respect -p flag when command builtin is run with -v/-V

The command builtin should only check the default path, not $PATH,
when the -p flag is used along with -v/-V.

Based on commits 65ae84b (by Harald van Dijk) and 29ee27d (by Herbert
Xu) from git://git.kernel.org/pub/scm/utils/dash/dash.git).

function                                             old     new   delta
commandcmd                                            72      87     +15
describe_command                                     437     450     +13
typecmd                                               84      86      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 30/0)               Total: 30 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 10 insertions, 4 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 8f0a5e0be..a2e06184b 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -7812,14 +7812,15 @@ findkwd(const char *s)
  * Locate and print what a word is...
  */
 static int
-describe_command(char *command, int describe_command_verbose)
+describe_command(char *command, const char *path, int describe_command_verbose)
 {
         struct cmdentry entry;
         struct tblentry *cmdp;
 #if ENABLE_ASH_ALIAS
         const struct alias *ap;
 #endif
-        const char *path = pathval();
+
+        path = path ? path : pathval();
 
         if (describe_command_verbose) {
                 out1str(command);
@@ -7919,7 +7920,7 @@ typecmd(int argc UNUSED_PARAM, char **argv)
                 verbose = 0;
         }
         while (argv[i]) {
-                err |= describe_command(argv[i++], verbose);
+                err |= describe_command(argv[i++], NULL, verbose);
         }
         return err;
 }
@@ -7933,6 +7934,7 @@ commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
                 VERIFY_BRIEF = 1,
                 VERIFY_VERBOSE = 2,
         } verify = 0;
+        const char *path = NULL;
 
         while ((c = nextopt("pvV")) != '\0')
                 if (c == 'V')
@@ -7943,9 +7945,11 @@ commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
                 else if (c != 'p')
                         abort();
 #endif
+                else
+                        path = bb_default_path;
         /* Mimic bash: just "command -v" doesn't complain, it's a nop */
         if (verify && (*argptr != NULL)) {
-                return describe_command(*argptr, verify - VERIFY_BRIEF);
+                return describe_command(*argptr, path, verify - VERIFY_BRIEF);
         }
 
         return 0;
diff --git a/shell/ash_test/ash-misc/command.right b/shell/ash_test/ash-misc/command.right
new file mode 100644
index 000000000..7f746d9c4
--- /dev/null
+++ b/shell/ash_test/ash-misc/command.right
@@ -0,0 +1 @@
+recho: not found
diff --git a/shell/ash_test/ash-misc/command.tests b/shell/ash_test/ash-misc/command.tests
new file mode 100755
index 000000000..5d445af51
--- /dev/null
+++ b/shell/ash_test/ash-misc/command.tests
@@ -0,0 +1 @@
+command -p -V recho