120 lines
4.0 KiB
Bash
120 lines
4.0 KiB
Bash
# This setup hook causes the fixup phase to rewrite all script
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# interpreter file names (`#! /path') to paths found in $PATH. E.g.,
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# /bin/sh will be rewritten to /nix/store/<hash>-some-bash/bin/sh.
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# /usr/bin/env gets special treatment so that ".../bin/env python" is
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# rewritten to /nix/store/<hash>/bin/python. Interpreters that are
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# already in the store are left untouched.
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# A script file must be marked as executable, otherwise it will not be
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# considered.
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fixupOutputHooks+=(patchShebangsAuto)
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# Run patch shebangs on a directory or file.
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# Can take multiple paths as arguments.
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# patchShebangs [--build | --host] PATH...
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# Flags:
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# --build : Lookup commands available at build-time
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# --host : Lookup commands available at runtime
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# Example use cases,
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# $ patchShebangs --host /nix/store/...-hello-1.0/bin
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# $ patchShebangs --build configure
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patchShebangs() {
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local pathName
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if [ "$1" = "--host" ]; then
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pathName=HOST_PATH
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shift
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elif [ "$1" = "--build" ]; then
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pathName=PATH
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shift
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fi
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echo "patching script interpreter paths in $@"
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local f
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local oldPath
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local newPath
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local arg0
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local args
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local oldInterpreterLine
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local newInterpreterLine
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if [ $# -eq 0 ]; then
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echo "No arguments supplied to patchShebangs" >&2
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return 0
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fi
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local f
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while IFS= read -r -d $'\0' f; do
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isScript "$f" || continue
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oldInterpreterLine=$(head -1 "$f" | tail -c+3)
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read -r oldPath arg0 args <<< "$oldInterpreterLine"
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if [ -z "$pathName" ]; then
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if [ -n "$strictDeps" ] && [[ "$f" = "$NIX_STORE"* ]]; then
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pathName=HOST_PATH
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else
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pathName=PATH
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fi
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fi
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if $(echo "$oldPath" | grep -q "/bin/env$"); then
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# Check for unsupported 'env' functionality:
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# - options: something starting with a '-'
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# - environment variables: foo=bar
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if $(echo "$arg0" | grep -q -- "^-.*\|.*=.*"); then
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echo "$f: unsupported interpreter directive \"$oldInterpreterLine\" (set dontPatchShebangs=1 and handle shebang patching yourself)" >&2
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exit 1
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fi
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newPath="$(PATH="${!pathName}" command -v "$arg0" || true)"
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else
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if [ "$oldPath" = "" ]; then
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# If no interpreter is specified linux will use /bin/sh. Set
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# oldpath="/bin/sh" so that we get /nix/store/.../sh.
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oldPath="/bin/sh"
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fi
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newPath="$(PATH="${!pathName}" command -v "$(basename "$oldPath")" || true)"
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args="$arg0 $args"
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fi
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# Strip trailing whitespace introduced when no arguments are present
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newInterpreterLine="$(echo "$newPath $args" | sed 's/[[:space:]]*$//')"
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if [ -n "$oldPath" -a "${oldPath:0:${#NIX_STORE}}" != "$NIX_STORE" ]; then
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if [ -n "$newPath" -a "$newPath" != "$oldPath" ]; then
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echo "$f: interpreter directive changed from \"$oldInterpreterLine\" to \"$newInterpreterLine\""
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# escape the escape chars so that sed doesn't interpret them
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escapedInterpreterLine=$(echo "$newInterpreterLine" | sed 's|\\|\\\\|g')
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# Preserve times, see: https://github.com/NixOS/nixpkgs/pull/33281
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timestamp=$(mktemp)
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touch -r "$f" "$timestamp"
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sed -i -e "1 s|.*|#\!$escapedInterpreterLine|" "$f"
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touch -r "$timestamp" "$f"
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rm "$timestamp"
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fi
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fi
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done < <(find "$@" -type f -perm -0100 -print0)
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stopNest
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}
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patchShebangsAuto () {
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if [ -z "${dontPatchShebangs-}" -a -e "$prefix" ]; then
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# Dev output will end up being run on the build platform. An
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# example case of this is sdl2-config. Otherwise, we can just
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# use the runtime path (--host).
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if [ "$output" != out ] && [ "$output" = "$outputDev" ]; then
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patchShebangs --build "$prefix"
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else
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patchShebangs --host "$prefix"
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fi
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fi
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}
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