zzexe: fix some performance issues on large files

appdwarf

@@ -36,9 +36,11 @@ unappimage() {
 
 zzexe() {
     [ "$1" = "-p" ] && p="$2" && shift 2 # save prefix if present
-    zstdmt -cq19 "$@" | ifne sponge "$1"
-    printfunc zzexe_header | cat - "$1" | ifne sponge "$1"
-    sed -i -e "2s/);$/${1##*[./]})/" -e "7s/^/$p /" "$1"
+    tmp=$(mktemp) # make tmp file to avoid io operations
+    printfunc zzexe_header | sed -e "2s/);$/${1##*[./]})/" -e "7s/^/$p /" > "$tmp"
+    zstdmt -cq19 "$@" >> "$tmp"
+    mv "$tmp" "$1"
+    chmod +x "$1"
     exit
 }
 
@@ -64,8 +66,12 @@ case "$1" in
         chmod +x "$2"
         exit ;;
     -d )
-        awk 'f;/^exit \$res$/{f=1}' "$2" | head -c-1 | zstd -cd | ifne sponge "$2"
-        d=dwarfs-root; dwarfsck -d0 -i"$2" && mkdir $d && dwarfsextract -o $d -i "$2"
+        d=dwarfs-root # just to keep line shorter, extract if file is dwarfs
+        dwarfsck -d0 -i"$2" && mkdir $d && dwarfsextract -o $d -i "$2" && exit
+        tmp=$(mktemp) # make tmp file to avoid io operations
+        awk 'f;/^exit \$res$/{f=1}' "$2" | head -c-1 | zstd -cd > "$tmp"
+        mv "$tmp" "$2"
+        chmod +x "$2"
         exit ;;
     -p )
         zzexe "$@" ;;
@@ -73,7 +79,7 @@ case "$1" in
         shift
         zzexe "$@" ;;
     --version | -v )
-        tput setaf 2; echo appdwarf 2022.07.19
+        tput setaf 2; echo appdwarf 2022.07.24
         tput setaf 6; echo Built by July 🏳️‍🌈; exit ;;
     -* | '' )
         echo "Usage: appdwarf [option] [APP/FILE/FOLDER/URL] [compression options]"
@@ -90,7 +96,7 @@ esac
 
 if [ ! -d "$1" ]; then # directory doesn't exist, see if this is an appimage
     if [ ! -f "$1" ]; then # file doesn't exist, see if this is a url
-        if ! echo "$1" | grep / ; then # AppImageHub
+        if ! echo "$1" | grep -q / ; then # AppImageHub
             echo "Checking AppImageHub for this program..."
             app=https://github.com/AppImage/appimage.github.io/raw/master/apps/$1.md
             shift
@@ -101,7 +107,7 @@ if [ ! -d "$1" ]; then # directory doesn't exist, see if this is an appimage
             set -- "https://github.com/$app" "$@"
         fi
 
-        if echo "$1" | grep 'https://github.com/[^/]*/[^/]*/*$'; then # GitHub url
+        if echo "$1" | grep -q 'https://github.com/[^/]*/[^/]*/*$'; then # GitHub url
             echo "Assuming this is a GitHub repo..."
             app="$(echo "${1%/}"/releases | sed 's|github.com|api.github.com/repos|')"
             shift
@@ -121,9 +127,8 @@ if [ ! -d "$1" ]; then # directory doesn't exist, see if this is an appimage
     rm -rf squashfs-root
     # this is a file, but it might be an existing dwarfs image
     if dwarfsck -d0 -i"$1"; then
-        echo "Existing dwarfs image found. Adding header..."
         set -- "$@" --recompress=none
-    elif unappimage "$1"; then
+    elif file "$1" | grep -q ELF && unappimage "$1"; then
         echo "AppImage found. Converting..."
         app="$(basename "$1" .AppImage)"
         rm -rf "$1" "$app"