Re: [PATCH v2] scripts/tags.sh: Handle missing {c,e,g}tags/cscope utilities

[Eugeniu Rosca <eugeniu.m.rosca@gmail.com>]

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From 5917e6602bd0e44c4a672bc4ac8c7a323b6300b6 Mon Sep 17 00:00:00 2001
From: Eugeniu Rosca <eugeniu.m.rosca@gmail.com>
Date: Sun, 24 Apr 2016 17:30:53 +0200
Subject: [PATCH v2] scripts/tags.sh: Handle missing {c,e,g}tags/cscope utilities

If the required ctags/etags/gtags/cscope host utility is not found,
current behavior is:

$> make cscope
  GEN     cscope
./scripts/tags.sh: line 140: cscope: command not found
$> make gtags
  GEN     gtags
./scripts/tags.sh: line 145: gtags: command not found
$> make tags
  GEN     tags
xargs: ctags: No such file or directory
sed: can't read tags: No such file or directory
Makefile:1509: recipe for target 'tags' failed
make: *** [tags] Error 2
$> make TAGS
  GEN     TAGS
xargs: etags: No such file or directory
sed: can't read TAGS: No such file or directory
Makefile:1509: recipe for target 'TAGS' failed
make: *** [TAGS] Error 2

Instead of implementing a more graceful handling, this patch only
makes sure that tags.sh script exits immediately upon the first
failure caused by the missing ctags/etags/gtags/cscope tool. By not
altering the exit code, the user will additionally get the failed
recipe in the root Makefile. The output becomes:

$> make cscope
  GEN     cscope
./scripts/tags.sh: line 140: cscope: command not found
Makefile:1517: recipe for target 'cscope' failed
make: *** [cscope] Error 127
$> make gtags
  GEN     gtags
./scripts/tags.sh: line 145: gtags: command not found
Makefile:1517: recipe for target 'gtags' failed
make: *** [gtags] Error 127
$> make tags
  GEN     tags
xargs: ctags: No such file or directory
Makefile:1517: recipe for target 'tags' failed
make: *** [tags] Error 127
$> make TAGS
  GEN     TAGS
xargs: etags: No such file or directory
Makefile:1517: recipe for target 'TAGS' failed
make: *** [TAGS] Error 127

Signed-off-by: Eugeniu Rosca <eugeniu.m.rosca@gmail.com>
---
 scripts/tags.sh | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/scripts/tags.sh b/scripts/tags.sh
index f72f48f..96b6dec 100755
--- a/scripts/tags.sh
+++ b/scripts/tags.sh
@@ -318,22 +318,22 @@ fi
 remove_structs=
 case "$1" in
 	"cscope")
-		docscope
+		docscope || exit
 		;;
 
 	"gtags")
-		dogtags
+		dogtags || exit
 		;;
 
 	"tags")
 		rm -f tags
-		xtags ctags
+		xtags ctags || exit
 		remove_structs=y
 		;;
 
 	"TAGS")
 		rm -f TAGS
-		xtags etags
+		xtags etags || exit
 		remove_structs=y
 		;;
 esac
-- 
2.7.4