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authorDenys Vlasenko <vda.linux@googlemail.com>2020-02-22 20:25:03 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2020-02-22 20:29:36 +0100
commitc2058ec98cf3f6722be4436cae07a386e3c7b48d (patch)
tree16d21416ad7716949955b73481c8224f701eb705 /shell/ash_test/ash-heredoc
parentc08993f40c0c6c7bdf453e77c3aa9dae8ec0dad9 (diff)
downloadbusybox-c2058ec98cf3f6722be4436cae07a386e3c7b48d.tar.gz
ash: Expand here-documents in the current shell environment
Upstream commit: Date: Sun, 11 Nov 2007 15:27:00 +0800 Expand here-documents in the current shell environment Previously we always expanded here-documents in a subshell. This is contrary to the POSIX specification and how other shells behave. What's more this slows down many expansions due to the extra fork (however, it must be said that it is possible for it speed up certain expansions by running it simultaneously with the command on two CPUs). This patch move the expansion into the current shell environment. Test case: unset a cat <<- EOF > /dev/null ${a=NOT} EOF echo ${a}BAD Old result: BAD New result: NOTBAD Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell/ash_test/ash-heredoc')
-rw-r--r--shell/ash_test/ash-heredoc/heredoc_side_effects.right1
-rwxr-xr-xshell/ash_test/ash-heredoc/heredoc_side_effects.tests5
2 files changed, 6 insertions, 0 deletions
diff --git a/shell/ash_test/ash-heredoc/heredoc_side_effects.right b/shell/ash_test/ash-heredoc/heredoc_side_effects.right
new file mode 100644
index 000000000..53b2c03c1
--- /dev/null
+++ b/shell/ash_test/ash-heredoc/heredoc_side_effects.right
@@ -0,0 +1 @@
+NO BUG
diff --git a/shell/ash_test/ash-heredoc/heredoc_side_effects.tests b/shell/ash_test/ash-heredoc/heredoc_side_effects.tests
new file mode 100755
index 000000000..3fb622ae4
--- /dev/null
+++ b/shell/ash_test/ash-heredoc/heredoc_side_effects.tests
@@ -0,0 +1,5 @@
+unset a
+cat <<EOF >/dev/null
+${a=NO}
+EOF
+echo $a BUG