commit ceca37901783988204caaf40dff4623d535cc789
Author:     Lasse Collin <lasse.collin@tukaani.org>
AuthorDate: Wed Jun 11 20:43:28 2014 +0300
Commit:     Lasse Collin <lasse.collin@tukaani.org>
CommitDate: Wed Jun 11 20:43:28 2014 +0300

    xzgrep: exit 0 when at least one file matches.
    
    Mimic the original grep behavior and return exit_success when
    at least one xz compressed file matches given pattern.
    
    Original bugreport:
    https://bugzilla.redhat.com/show_bug.cgi?id=1108085
    
    Thanks to Pavel Raiskup for the patch.

diff --git a/src/scripts/xzgrep.in b/src/scripts/xzgrep.in
index 951266b..018915f 100644
--- a/src/scripts/xzgrep.in
+++ b/src/scripts/xzgrep.in
@@ -147,7 +147,9 @@ if test $# -eq 0; then
 fi
 
 exec 3>&1
-res=0
+
+# res=1 means that no file matched yet
+res=1
 
 for i; do
   case $i in
@@ -195,8 +197,17 @@ for i; do
     fi >&3 5>&-
   )
   r=$?
+
+  # fail occured previously, nothing worse can happen
+  test $res -gt 1 && continue
+
   test "$xz_status" -eq 0 || test "$xz_status" -eq 2 \
       || test "$(kill -l "$xz_status" 2> /dev/null)" = "PIPE" || r=2
-  test $res -lt $r && res=$r
+
+  # still no match
+  test $r -eq 1 && continue
+
+  # 0 == match, >=2 == fail
+  res=$r
 done
 exit $res