113 lines
3.4 KiB
Bash
Executable File
113 lines
3.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Example input:
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# ./make_portable.sh mycoolbinary
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# Or:
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# USE_RPATH=1 ./make_portable.sh mycoolbinary
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#
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# where mycoolbinary is a mach-o object file
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# (for example an executable binary or a .dylib)
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#
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# this script rewrites your file's every environment-specific
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# dynamic link (recursively!)
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# such that they point to local .dylibs.
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# these .dylibs are then copied to a folder lib, next to your binary
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#
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# by "environment-specific" I mean any link to a .dylib under /usr/local
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set -o pipefail
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error() {
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local parent_lineno="$1"
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local message="$2"
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local code="${3:-1}"
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if [[ -n "$message" ]] ; then
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echo "Error on or near line ${parent_lineno}: ${message}; exiting with status ${code}"
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else
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echo "Error on or near line ${parent_lineno}; exiting with status ${code}"
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fi
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exit "${code}"
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}
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trap 'error ${LINENO}' ERR
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BINARY="$1"
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BINARYDIR=$(dirname "$BINARY")
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LIBDIRNAME=${LIBDIRNAME:-lib}
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LIBOUTPUTDIR="$BINARYDIR/$LIBDIRNAME"
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# assume that our binary is running from:
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# CoolBinary.app/Contents/MacOS/coolbinary
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# and wants to navigate to:
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# CoolBinary.app/Contents/lib/coollibrary.dylib
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RPATH_FALLBACK="@loader_path/../$LIBDIRNAME"
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if [ -z ${USE_RPATH+x} ]; then
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# don't use rpath
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OBJLOADREL="$RPATH_FALLBACK"
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else
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OBJLOADREL="@rpath"
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# define in our binary what it should expand the
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# runtime search path @rpath to
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install_name_tool -add_rpath "$RPATH_FALLBACK" "$BINARY"
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fi
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# make a lib folder
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mkdir -p "$LIBOUTPUTDIR"
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# find every LC_LOAD_DYLIB command in the obj file
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# filter to just loads under /usr/local
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# print the absolute path of each such dylib
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get_env_specific_direct_dependencies () {
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# otool -L shows us every LC_LOAD_DYLIB plus LC_ID_DYLIB
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# otool -D shows us just LC_ID_DYLIB
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ALL_DYLIBS=$(otool -L "$1" | awk 'NR>1')
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DYLIB_ID=$(otool -D "$1" | awk 'NR>1')
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if [ -z "$DYLIB_ID" ]; then
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DIRECT_DEPS="$ALL_DYLIBS"
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else
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DIRECT_DEPS=$(echo "$ALL_DYLIBS" | grep -v "$DYLIB_ID")
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fi
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echo "$DIRECT_DEPS" \
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| awk '/\/usr\/local\//,/.dylib/ {print $1}'
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}
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# lookup LC_LOAD_DYLIB commands in an obj file,
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# then follow those loads and ask the same of each
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# of its dylibs, recursively
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get_env_specific_dependencies_recursive () {
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while read -r obj; do
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[ -z "$obj" ] && continue
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echo "$obj"
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get_env_specific_dependencies_recursive "$obj"
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done < <(get_env_specific_direct_dependencies "$1")
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}
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DEP_PATHS=$(get_env_specific_dependencies_recursive "$BINARY")
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mkdir -p "$LIBOUTPUTDIR"
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# copy each distinct dylib in the dependency tree into our lib folder
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echo "$DEP_PATHS" \
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| xargs -n1 realpath \
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| sort \
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| uniq \
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| xargs -I'{}' cp {} "$LIBOUTPUTDIR/"
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chmod +w "$BINARY" "$LIBOUTPUTDIR"/*.dylib
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while read -r obj; do
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[ -z "$obj" ] && continue
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OBJ_LEAF_NAME=$(echo "$obj" | awk -F'/' '{print $NF}')
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# rewrite the install name of this obj file. completely optional.
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# provides good default for future people who link to it.
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install_name_tool -id "$OBJLOADREL/$OBJ_LEAF_NAME" "$obj"
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# iterate over every LC_LOAD_DYLIB command in the objfile
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while read -r load; do
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[ -z "$load" ] && continue
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LOAD_LEAF_NAME=$(echo "$load" | awk -F'/' '{print $NF}')
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# rewrite a LC_LOAD_DYLIB command in this obj file
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# to point relative to @rpath
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install_name_tool -change "$load" "$OBJLOADREL/$LOAD_LEAF_NAME" "$obj"
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done < <(get_env_specific_direct_dependencies "$obj")
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done < <(cat <(echo "$BINARY") <(echo "$DEP_PATHS" | awk -F'/' -v l="$LIBOUTPUTDIR" -v OFS='/' '{print l,$NF}'))
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