kiss: fix pkg_conflicts for rare cases

This fixes pkg_conflicts where there are no packages or only one
packages in the system

FossilOrigin-Name: b94f9ace5332320d00b255b7b34093885c3c6d4f06da7ea6dc7d56b24c3a2b71

1 files changed, 11 insertions, 0 deletions

diff --git a/kiss b/kiss
index 34e6a1e..e59a202 100755
--- a/kiss
+++ b/kiss
@@ -743,6 +743,17 @@ pkg_conflicts() {
 
     [ -s "$cac_dir/$pid-m" ] || return 0
 
+    # In rare cases where the system only has one package installed
+    # and you are reinstalling that package, grep will try to read from
+    # standard input if we continue here.
+    #
+    # Also, if we don't have any packages installed grep will give an
+    # error. This will not cause the installation to fail, but we don't
+    # need to check for conflicts if that's the case anyway. If we have
+    # only zero packages or one package, just stop wasting time and continue
+    # with the installation.
+    [ "$1" ] && [ -f "$1" ] || return 0
+
     # Enable alternatives automatically if it is safe to do so.
     # This checks to see that the package that is about to be installed
     # doesn't overwrite anything it shouldn't in '/var/db/kiss/installed'.