Introduce sane_unset and use it to ensure proper && chaining

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/README b/t/README
index ee4c0cf685a7b02c566e70057996510ba5b0fb5a..2aceb67c785b40642818849d80c1f926b0897af9 100644 (file)
--- a/t/README
+++ b/t/README
@@ -259,14 +259,11 @@ Do:
        test ...
 
    That way all of the commands in your tests will succeed or fail. If
-   you must ignore the return value of something (e.g., the return
-   after unsetting a variable that was already unset is unportable) it's
-   best to indicate so explicitly with a semicolon:
-
-       unset HLAGH;
-       git merge hla &&
-       git push gh &&
-       test ...
+   you must ignore the return value of something, consider using a
+   helper function (e.g. use sane_unset instead of unset, in order
+   to avoid unportable return value for unsetting a variable that was
+   already unset), or prepending the command with test_might_fail or
+   test_must_fail.
 
  - Check the test coverage for your tests. See the "Test coverage"
    below.

diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index 7fe8883ae060947da804abb5b287fb94d19e87c4..d44194c35fe5de72af0721a05bb1038f1720b4ac 100755 (executable)
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -25,7 +25,7 @@ check_config () {
 
 test_expect_success 'plain' '
        (
-               unset GIT_DIR GIT_WORK_TREE
+               sane_unset GIT_DIR GIT_WORK_TREE &&
                mkdir plain &&
                cd plain &&
                git init
@@ -35,7 +35,7 @@ test_expect_success 'plain' '
 
 test_expect_success 'plain with GIT_WORK_TREE' '
        if (
-               unset GIT_DIR
+               sane_unset GIT_DIR &&
                mkdir plain-wt &&
                cd plain-wt &&
                GIT_WORK_TREE=$(pwd) git init
@@ -48,7 +48,7 @@ test_expect_success 'plain with GIT_WORK_TREE' '
 
 test_expect_success 'plain bare' '
        (
-               unset GIT_DIR GIT_WORK_TREE GIT_CONFIG
+               sane_unset GIT_DIR GIT_WORK_TREE GIT_CONFIG &&
                mkdir plain-bare-1 &&
                cd plain-bare-1 &&
                git --bare init
@@ -58,7 +58,7 @@ test_expect_success 'plain bare' '
 
 test_expect_success 'plain bare with GIT_WORK_TREE' '
        if (
-               unset GIT_DIR GIT_CONFIG
+               sane_unset GIT_DIR GIT_CONFIG &&
                mkdir plain-bare-2 &&
                cd plain-bare-2 &&
                GIT_WORK_TREE=$(pwd) git --bare init
@@ -72,7 +72,7 @@ test_expect_success 'plain bare with GIT_WORK_TREE' '
 test_expect_success 'GIT_DIR bare' '
 
        (
-               unset GIT_CONFIG
+               sane_unset GIT_CONFIG &&
                mkdir git-dir-bare.git &&
                GIT_DIR=git-dir-bare.git git init
        ) &&
@@ -82,7 +82,7 @@ test_expect_success 'GIT_DIR bare' '
 test_expect_success 'init --bare' '
 
        (
-               unset GIT_DIR GIT_WORK_TREE GIT_CONFIG
+               sane_unset GIT_DIR GIT_WORK_TREE GIT_CONFIG &&
                mkdir init-bare.git &&
                cd init-bare.git &&
                git init --bare
@@ -93,7 +93,7 @@ test_expect_success 'init --bare' '
 test_expect_success 'GIT_DIR non-bare' '
 
        (
-               unset GIT_CONFIG
+               sane_unset GIT_CONFIG &&
                mkdir non-bare &&
                cd non-bare &&
                GIT_DIR=.git git init
@@ -104,7 +104,7 @@ test_expect_success 'GIT_DIR non-bare' '
 test_expect_success 'GIT_DIR & GIT_WORK_TREE (1)' '
 
        (
-               unset GIT_CONFIG
+               sane_unset GIT_CONFIG &&
                mkdir git-dir-wt-1.git &&
                GIT_WORK_TREE=$(pwd) GIT_DIR=git-dir-wt-1.git git init
        ) &&
@@ -114,7 +114,7 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (1)' '
 test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 
        if (
-               unset GIT_CONFIG
+               sane_unset GIT_CONFIG &&
                mkdir git-dir-wt-2.git &&
                GIT_WORK_TREE=$(pwd) GIT_DIR=git-dir-wt-2.git git --bare init
        )
@@ -127,7 +127,7 @@ test_expect_success 'GIT_DIR & GIT_WORK_TREE (2)' '
 test_expect_success 'reinit' '
 
        (
-               unset GIT_CONFIG GIT_WORK_TREE GIT_CONFIG
+               sane_unset GIT_CONFIG GIT_WORK_TREE GIT_CONFIG &&
 
                mkdir again &&
                cd again &&
@@ -175,8 +175,8 @@ test_expect_success 'init with init.templatedir set' '
                git config -f "$test_config"  init.templatedir "${HOME}/templatedir-source" &&
                mkdir templatedir-set &&
                cd templatedir-set &&
-               unset GIT_CONFIG_NOGLOBAL &&
-               unset GIT_TEMPLATE_DIR &&
+               sane_unset GIT_CONFIG_NOGLOBAL &&
+               sane_unset GIT_TEMPLATE_DIR &&
                NO_SET_GIT_TEMPLATE_DIR=t &&
                export NO_SET_GIT_TEMPLATE_DIR &&
                git init
@@ -187,7 +187,7 @@ test_expect_success 'init with init.templatedir set' '
 test_expect_success 'init --bare/--shared overrides system/global config' '
        (
                test_config="$HOME"/.gitconfig &&
-               unset GIT_CONFIG_NOGLOBAL &&
+               sane_unset GIT_CONFIG_NOGLOBAL &&
                git config -f "$test_config" core.bare false &&
                git config -f "$test_config" core.sharedRepository 0640 &&
                mkdir init-bare-shared-override &&
@@ -202,7 +202,7 @@ test_expect_success 'init --bare/--shared overrides system/global config' '
 test_expect_success 'init honors global core.sharedRepository' '
        (
                test_config="$HOME"/.gitconfig &&
-               unset GIT_CONFIG_NOGLOBAL &&
+               sane_unset GIT_CONFIG_NOGLOBAL &&
                git config -f "$test_config" core.sharedRepository 0666 &&
                mkdir shared-honor-global &&
                cd shared-honor-global &&

diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index fb744e3c4a9a19d9285fc04053044242ffed0c65..7d00d49d0da6487bec345176411e1f51e712f137 100755 (executable)
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -41,7 +41,7 @@ else
 fi
 
 test_expect_success 'setup' '
-       unset GIT_PAGER GIT_PAGER_IN_USE;
+       sane_unset GIT_PAGER GIT_PAGER_IN_USE &&
        test_might_fail git config --unset core.pager &&
 
        PAGER="cat >paginated.out" &&
@@ -254,7 +254,7 @@ test_default_pager() {
        parse_args "$@"
 
        $test_expectation SIMPLEPAGERTTY "$cmd - default pager is used by default" "
-               unset PAGER GIT_PAGER;
+               sane_unset PAGER GIT_PAGER &&
                test_might_fail git config --unset core.pager &&
                rm -f default_pager_used ||
                cleanup_fail &&
@@ -277,7 +277,7 @@ test_PAGER_overrides() {
        parse_args "$@"
 
        $test_expectation TTY "$cmd - PAGER overrides default pager" "
-               unset GIT_PAGER;
+               sane_unset GIT_PAGER &&
                test_might_fail git config --unset core.pager &&
                rm -f PAGER_used ||
                cleanup_fail &&
@@ -305,7 +305,7 @@ test_core_pager() {
        parse_args "$@"
 
        $test_expectation TTY "$cmd - repository-local core.pager setting $used_if_wanted" "
-               unset GIT_PAGER;
+               sane_unset GIT_PAGER &&
                rm -f core.pager_used ||
                cleanup_fail &&
 
@@ -333,7 +333,7 @@ test_pager_subdir_helper() {
        parse_args "$@"
 
        $test_expectation TTY "$cmd - core.pager $used_if_wanted from subdirectory" "
-               unset GIT_PAGER;
+               sane_unset GIT_PAGER &&
                rm -f core.pager_used &&
                rm -fr sub ||
                cleanup_fail &&

diff --git a/t/t7502-commit.sh b/t/t7502-commit.sh
index ac2e187a5720d1ff947e58073dd6cc403ef40d5d..c1c66450a395af91c54e7815ae7c21393f7fd2ad 100755 (executable)
--- a/t/t7502-commit.sh
+++ b/t/t7502-commit.sh
@@ -252,8 +252,8 @@ test_expect_success 'committer is automatic' '
 
        echo >>negative &&
        (
-               unset GIT_COMMITTER_EMAIL
-               unset GIT_COMMITTER_NAME
+               sane_unset GIT_COMMITTER_EMAIL &&
+               sane_unset GIT_COMMITTER_NAME &&
                # must fail because there is no change
                test_must_fail git commit -e -m "sample"
        ) &&

diff --git a/t/test-lib.sh b/t/test-lib.sh
index d86edcd7a62ff9e12aba72259d5927a7a7e2eeaa..87308f5a9bb8086475dbc49276b8ad249f196d32 100644 (file)
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -268,6 +268,17 @@ remove_cr () {
        tr '\015' Q | sed -e 's/Q$//'
 }
 
+# In some bourne shell implementations, the "unset" builtin returns
+# nonzero status when a variable to be unset was not set in the first
+# place.
+#
+# Use sane_unset when that should not be considered an error.
+
+sane_unset () {
+       unset "$@"
+       return 0
+}
+
 test_tick () {
        if test -z "${test_tick+set}"
        then