File bzip2-1.0.6-bzgrep_return_value.patch of Package bzip2.21593
Index: bzip2-1.0.6/bzgrep
===================================================================
--- bzip2-1.0.6.orig/bzgrep
+++ bzip2-1.0.6/bzgrep
@@ -67,8 +67,20 @@ for i do
j=${j//|/\\|}
j=${j//&/\\&}
j=`printf "%s" "$j" | tr '\n' ' '`
- bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"
- r=$?
+ # A trick adapted from
+ # https://groups.google.com/forum/#!original/comp.unix.shell/x1345iu10eg/Nn1n-1r1uU0J
+ # that has the same effect as the following bash code:
+ # bzip2 -cdfq "$i" | $grep $opt "$pat" | sed "s|^|${j}:|"
+ # r=${PIPESTATUS[1]}
+ exec 3>&1
+ eval `
+ exec 4>&1 >&3 3>&-
+ {
+ bzip2 -cdfq "$i" 4>&-
+ } | {
+ $grep $opt "$pat" 4>&-; echo "r=$?;" >&4
+ } | sed "s|^|${j}:|"
+ `
fi
test "$r" -ne 0 && res="$r"
done