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authorDenys Vlasenko <vda.linux@googlemail.com>2018-08-05 10:39:18 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2018-08-05 11:14:11 +0200
commit9abf53beb48b40e98d50fd35f445d6474af3a494 (patch)
treeb60727e9f30316b8d89c5c31178698ffb81a747c /shell/ash_test/ash-vars
parentc2aa218f23a4e952746ebef7bb86668c6255471c (diff)
downloadbusybox-9abf53beb48b40e98d50fd35f445d6474af3a494.tar.gz
ash: eval: Variable assignments on functions are no longer persistent
Upstream commit: Date: Wed, 4 Apr 2018 17:54:01 +0800 eval: Variable assignments on functions are no longer persistent Dirk Fieldhouse <fieldhouse@gmx.net> wrote: > In POSIX.1-2017 ("simultaneously IEEE Std 1003.1™-2017 and The Open > Group Technical Standard Base Specifications, Issue 7") > <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09>, > we read under '2.9.1 Simple Commands' > > "Variable assignments shall be performed as follows: > ... > - If the command name is a standard utility implemented as a function > (see XBD Utility), the effect of variable assignments shall be as if the > utility was not implemented as a function. > ... > - If the command name is a function that is not a standard utility > implemented as a function, variable assignments shall affect the current > execution environment during the execution of the function. It is > unspecified: > > * Whether or not the variable assignments persist after the > completion of the function > > * Whether or not the variables gain the export attribute during > the execution of the function > > * Whether or not export attributes gained as a result of the > variable assignments persist after the completion of the function (if > variable assignments persist after the completion of the function)" POSIX used to require the current dash behaviour. However, you're right that this is no longer the case. This patch will remove the persistence of the variable assignment. I have considered the exporting the variables during the function execution but have decided against it because: 1) It makes the code bigger. 2) dash has never done this in the past. 3) You cannot use this portably anyway. Reported-by: Dirk Fieldhouse <fieldhouse@gmx.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> function old new delta evalcommand 1606 1635 +29 evalcase 313 317 +4 evalfun 280 268 -12 pushlocalvars 48 - -48 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 2/1 up/down: 33/-60) Total: -27 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell/ash_test/ash-vars')
-rw-r--r--shell/ash_test/ash-vars/var_leak.right2
-rwxr-xr-xshell/ash_test/ash-vars/var_leak.tests4
2 files changed, 2 insertions, 4 deletions
diff --git a/shell/ash_test/ash-vars/var_leak.right b/shell/ash_test/ash-vars/var_leak.right
index 01a5e3263..764680086 100644
--- a/shell/ash_test/ash-vars/var_leak.right
+++ b/shell/ash_test/ash-vars/var_leak.right
@@ -1,4 +1,4 @@
should be empty: ''
should be empty: ''
should be not empty: 'val2'
-should be not empty: 'val3'
+should be empty: ''
diff --git a/shell/ash_test/ash-vars/var_leak.tests b/shell/ash_test/ash-vars/var_leak.tests
index 5242e24eb..adf66692e 100755
--- a/shell/ash_test/ash-vars/var_leak.tests
+++ b/shell/ash_test/ash-vars/var_leak.tests
@@ -15,9 +15,7 @@ VAR=''
VAR=val2 exec 2>&1
echo "should be not empty: '$VAR'"
-# ash follows the "function call is a special builtin" rule here
-# (bash does not do it)
f() { true; }
VAR=''
VAR=val3 f
-echo "should be not empty: '$VAR'"
+echo "should be empty: '$VAR'"