[tip:perf/urgent] perf tools: Support running perf binaries with a dash in their name

[tip-bot for Milian Wolff]

Commit-ID:  3192f1ed3dd3a6883d5ae31bf2ff69984ea0fd54
Gitweb:     http://git.kernel.org/tip/3192f1ed3dd3a6883d5ae31bf2ff69984ea0fd54
Author:     Milian Wolff <milian.wolff@xxxxxxxx>
AuthorDate: Mon, 11 Sep 2017 13:14:22 +0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 12 Sep 2017 12:48:54 -0300

perf tools: Support running perf binaries with a dash in their name

Previously the part behind "perf-" was interpreted as an internal perf
command. If the suffix could not be handled, the execution was stopped.
This makes it impossible to launch perf binaries that got renamed to
have the `perf-` prefix. This is e.g. the case for appimages (e.g.
"perf-x86_64.AppImage"), but would also apply to all other scenarios
where users symlink or rename perf themselves:

Status quo with the broken behavior:

  $ ln -s ./perf ./perf-custom-suffix
  $ ./perf-custom-suffix list
  cannot handle custom-suffix internally$

Also note the missing newline at the end of the error message.

With this patch applied, the above works properly:

  $ ./perf-custom-suffix list

  List of pre-defined events (to be used in -e):
  ...

Signed-off-by: Milian Wolff <milian.wolff@xxxxxxxx>
Acked-by: David Ahern <dsahern@xxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Yao Jin <yao.jin@xxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170911111422.31903-1-milian.wolff@xxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/perf.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index e0279ba..2f19e03 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -467,15 +467,21 @@ int main(int argc, const char **argv)
 	 *  - cannot execute it externally (since it would just do
 	 *    the same thing over again)
 	 *
-	 * So we just directly call the internal command handler, and
-	 * die if that one cannot handle it.
+	 * So we just directly call the internal command handler. If that one
+	 * fails to handle this, then maybe we just run a renamed perf binary
+	 * that contains a dash in its name. To handle this scenario, we just
+	 * fall through and ignore the "xxxx" part of the command string.
 	 */
 	if (strstarts(cmd, "perf-")) {
 		cmd += 5;
 		argv[0] = cmd;
 		handle_internal_command(argc, argv);
-		fprintf(stderr, "cannot handle %s internally", cmd);
-		goto out;
+		/*
+		 * If the command is handled, the above function does not
+		 * return undo changes and fall through in such a case.
+		 */
+		cmd -= 5;
+		argv[0] = cmd;
 	}
 	if (strstarts(cmd, "trace")) {
 #ifdef HAVE_LIBAUDIT_SUPPORT