runshell for Android

standalone/android/runshell

@@ -0,0 +1,61 @@
+#!/system/bin/sh
+# Runs a shell command (or interactive shell) using the binaries and
+# libraries bundled with this app.
+
+set -e
+
+base="$(dirname $0)"
+
+if [ ! -d "$base" ]; then
+	echo "** cannot find base directory (I seem to be $0)" >&2
+	exit 1
+fi
+
+if [ ! -e "$base/bin/git-annex" ]; then
+	echo "** base directory $base does not contain bin/git-annex" >&2
+	exit 1
+fi
+if [ ! -e "$base/bin/git" ]; then
+	echo "** base directory $base does not contain bin/git" >&2
+	exit 1
+fi
+
+# Install busybox links.
+if [ ! -e "$base/bin/sh" ]; then
+	"$base/bin/busybox" --install "$base/bin"
+fi
+
+# Get absolute path to base, to avoid breakage when things change directories.
+orig="$(pwd)"
+cd "$base"
+base="$(pwd)"
+cd "$orig"
+
+# Put our binaries first, to avoid issues with out of date or incompatable
+# system binaries.
+ORIG_PATH="$PATH"
+export ORIG_PATH
+PATH=$base/bin:$PATH
+export PATH
+
+ORIG_GIT_EXEC_PATH="$GIT_EXEC_PATH"
+export ORIG_GIT_EXEC_PATH
+GIT_EXEC_PATH=$base/libexec/git-core
+export GIT_EXEC_PATH
+
+ORIG_GIT_TEMPLATE_DIR="$GIT_TEMPLATE_DIR"
+export ORIG_GIT_TEMPLATE_DIR
+GIT_TEMPLATE_DIR="$base/templates"
+export GIT_TEMPLATE_DIR
+
+# Indicate which variables were exported above.
+GIT_ANNEX_STANDLONE_ENV="PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR"
+export GIT_ANNEX_STANDLONE_ENV
+
+if [ "$1" ]; then
+	cmd="$1"
+	shift 1
+	exec "$cmd" "$@"
+else
+	sh
+fi