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* [PATCH 01/10] check_bindir: don't use the -a or -o option with the test command
@ 2014-05-15 14:21 Elia Pinto
  2014-05-15 14:21 ` [PATCH 02/10] contrib/examples/git-clone.sh: " Elia Pinto
                   ` (10 more replies)
  0 siblings, 11 replies; 13+ messages in thread
From: Elia Pinto @ 2014-05-15 14:21 UTC (permalink / raw)
  To: git; +Cc: Elia Pinto

Even though POSIX.1 lists -a/-o as options to "test", they are
marked "Obsolescent XSI". Scripts using these expressions
should be converted  as follow:

test "$1" -a "$2"

should be written as:

test "$1" && test "$2"

Likewise

test "$1" -o "$2"

should be written as:

test "$1"  test "$2"

But note that, in test, -a has higher precedence than -o while
"&&" and "||" have equal precedence in the shell.

The reason for this is that the precedence rules were never well
specified, and this made many sane-looking uses of "test -a/-o" problematic.

For example, if $x is "=", these work according to POSIX (it's not
portable, but in practice it's okay):

   $ test -z "$x"
   $ test -z "$x" && test a = b

but this doesn't

   $ test -z "$x" -a a = b
   bash: test: too many arguments

because it groups "test -n = -a" and is left with "a = b".

Similarly, if $x is "-f", these

   $ test "$x"
   $ test "$x" || test c = d

correctly adds an implicit "-n", but this fails:

   $ test "$x" -o c = d
   bash: test: too many arguments

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
---
Inspired from this discussion http://permalink.gmane.org/gmane.comp.version-control.git/137056

 check_bindir |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/check_bindir b/check_bindir
index a1c4c3e..623eadc 100755
--- a/check_bindir
+++ b/check_bindir
@@ -2,7 +2,7 @@
 bindir="$1"
 gitexecdir="$2"
 gitcmd="$3"
-if test "$bindir" != "$gitexecdir" -a -x "$gitcmd"
+if test "$bindir" != "$gitexecdir" && test -x "$gitcmd"
 then
 	echo
 	echo "!! You have installed git-* commands to new gitexecdir."
-- 
1.7.10.4

^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH 01/10] check_bindir: don't use the -a or -b option with the test command
@ 2014-05-15 14:17 Elia Pinto
  2014-05-15 14:17 ` [PATCH 06/10] contrib/examples/git-resolve.sh: " Elia Pinto
  0 siblings, 1 reply; 13+ messages in thread
From: Elia Pinto @ 2014-05-15 14:17 UTC (permalink / raw)
  To: git; +Cc: Elia Pinto

Even though POSIX.1 lists -a/-o as options to "test", they are
marked "Obsolescent XSI". Scripts using these expressions
should be converted  as follow:

test "$1" -a "$2"

should be written as:

test "$1" && test "$2"

Likewise

test "$1" -o "$2"

should be written as:

test "$1"  test "$2"

But note that, in test, -a has higher precedence than -o while
"&&" and "||" have equal precedence in the shell.

The reason for this is that the precedence rules were never well
specified, and this made many sane-looking uses of "test -a/-o" problematic.

For example, if $x is "=", these work according to POSIX (it's not
portable, but in practice it's okay):

   $ test -z "$x"
   $ test -z "$x" && test a = b

but this doesn't

   $ test -z "$x" -a a = b
   bash: test: too many arguments

because it groups "test -n = -a" and is left with "a = b".

Similarly, if $x is "-f", these

   $ test "$x"
   $ test "$x" || test c = d

correctly adds an implicit "-n", but this fails:

   $ test "$x" -o c = d
   bash: test: too many arguments

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
---
Inspired from this discussion http://permalink.gmane.org/gmane.comp.version-control.git/137056

 check_bindir |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/check_bindir b/check_bindir
index a1c4c3e..623eadc 100755
--- a/check_bindir
+++ b/check_bindir
@@ -2,7 +2,7 @@
 bindir="$1"
 gitexecdir="$2"
 gitcmd="$3"
-if test "$bindir" != "$gitexecdir" -a -x "$gitcmd"
+if test "$bindir" != "$gitexecdir" && test -x "$gitcmd"
 then
 	echo
 	echo "!! You have installed git-* commands to new gitexecdir."
-- 
1.7.10.4

^ permalink raw reply related	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2014-05-15 17:08 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-05-15 14:21 [PATCH 01/10] check_bindir: don't use the -a or -o option with the test command Elia Pinto
2014-05-15 14:21 ` [PATCH 02/10] contrib/examples/git-clone.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 03/10] contrib/examples/git-commit.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 04/10] contrib/examples/git-merge.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 05/10] contrib/examples/git-repack.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 06/10] contrib/examples/git-resolve.sh: don't use the -a or -b " Elia Pinto
2014-05-15 14:21 ` [PATCH 07/10] git-bisect.sh: don't use the -a or -o " Elia Pinto
2014-05-15 14:21 ` [PATCH 08/10] git-mergetool.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 09/10] git-rebase--interactive.sh: " Elia Pinto
2014-05-15 14:21 ` [PATCH 10/10] git-submodule.sh: " Elia Pinto
2014-05-15 16:21 ` [PATCH 01/10] check_bindir: " Matthieu Moy
2014-05-15 17:07 ` Junio C Hamano
  -- strict thread matches above, loose matches on Subject: below --
2014-05-15 14:17 [PATCH 01/10] check_bindir: don't use the -a or -b " Elia Pinto
2014-05-15 14:17 ` [PATCH 06/10] contrib/examples/git-resolve.sh: " Elia Pinto

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