kiss: Use ggrep if available

kiss

@@ -270,7 +270,7 @@ pkg_fixdeps() {
     # Get a list of binaries and libraries, false files
     # will be found, however it's faster to get 'ldd' to check
     # them anyway than to filter them out.
-    find "$pkg_dir/$pkg_name" -type f 2>/dev/null |
+    find "$pkg_dir/$pkg_name/" -type f 2>/dev/null |
 
     while read -r file; do
         # Run 'ldd' on the file and parse each line. The code
@@ -285,7 +285,7 @@ pkg_fixdeps() {
             dep=${dep% *}
 
             # Figure out which package owns the file.
-            dep=$(grep -lFx "${dep##$KISS_ROOT}" "$@")
+            dep=$("$grep" -lFx "${dep##$KISS_ROOT}" "$@")
 
             # Extract package name from 'grep' match.
             dep=${dep%/*}
@@ -612,7 +612,7 @@ pkg_conflicts() {
     # be installed package's manifest and the above filtered
     # list.
     [ -s "$cac_dir/$pid-m" ] &&
-        grep -Fxf "$cac_dir/$pid-m" -- "$@" &&
+        "$grep" -Fxf "$cac_dir/$pid-m" -- "$@" &&
             die "Package '$p_name' conflicts with another package"
 
     set -e
@@ -636,7 +636,7 @@ pkg_remove() {
     [ "$2" = check ] && for file in "$sys_db/"*; do
         # Check each depends file for the package and if it's
         # a run-time dependency, append to the $required_by string.
-        grep -qFx "$1" "$file/depends" 2>/dev/null &&
+        "$grep" -qFx "$1" "$file/depends" 2>/dev/null &&
             required_by="$required_by'${file##*/}', "
     done
 
@@ -693,7 +693,7 @@ pkg_install() {
     # Figure out which package the tar-ball installs by checking for
     # a database entry inside the tar-ball. If no database entry exists,
     # exit here as the tar-ball is *most likely* not a KISS package.
-    pkg_name=$(tar tf "$tar_file" | grep -x "\./$pkg_db/.*/version") ||
+    pkg_name=$(tar tf "$tar_file" | "$grep" -x "\./$pkg_db/.*/version") ||
         die "'${tar_file##*/}' is not a valid KISS package"
 
     pkg_name=${pkg_name%/*}
@@ -750,7 +750,7 @@ pkg_install() {
     # Remove any leftover files if this is an upgrade.
     [ "$old_manifest" ] && {
         printf '%s\n' "$old_manifest" |
-        grep -vFxf "$sys_db/$pkg_name/manifest" - |
+        "$grep" -vFxf "$sys_db/$pkg_name/manifest" - |
 
         while read -r file; do
             # Skip deleting some leftover files.
@@ -1088,6 +1088,11 @@ main() {
     # up before we die. This occurs on 'Ctrl+C' as well as success and error.
     trap pkg_clean EXIT INT
 
+    # Prefer GNU grep if installed as it is much much faster than busybox's
+    # implementation. Very much worth it if you value performance over
+    # POSIX correctness.
+    grep=$(command -v ggrep 2>/dev/null) || grep='grep'
+
     # This allows for automatic setup of a KISS chroot and will
     # do nothing on a normal system.
     mkdir -p "${sys_db:=$KISS_ROOT/$pkg_db}" 2>/dev/null ||: