148 lines
5 KiB
Bash
148 lines
5 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 | --update] [--] 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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# --update : Update shebang paths that are in Nix store
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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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local update
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--host)
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pathName=HOST_PATH
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shift
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;;
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--build)
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pathName=PATH
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shift
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;;
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--update)
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update=true
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shift
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;;
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--)
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shift
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break
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;;
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-*|--*)
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echo "Unknown option $1 supplied to patchShebangs" >&2
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return 1
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;;
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*)
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break
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;;
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esac
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done
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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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# read exits unclean if the shebang does not end with a newline, but still assigns the variable.
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# So if read returns errno != 0, we check if the assigned variable is non-empty and continue.
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read -r oldInterpreterLine < "$f" || [ "$oldInterpreterLine" ]
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read -r oldPath arg0 args <<< "${oldInterpreterLine:2}"
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if [[ -z "${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 [[ "$oldPath" == *"/bin/env" ]]; then
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if [[ $arg0 == "-S" ]]; then
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arg0=${args%% *}
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args=${args#* }
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newPath="$(PATH="${!pathName}" type -P "env" || true)"
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args="-S $(PATH="${!pathName}" type -P "$arg0" || true) $args"
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# Check for unsupported 'env' functionality:
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# - options: something starting with a '-' besides '-S'
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# - environment variables: foo=bar
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elif [[ $arg0 == "-"* || $arg0 == *"="* ]]; then
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echo "$f: unsupported interpreter directive \"$oldInterpreterLine\" (set dontPatchShebangs=1 and handle shebang patching yourself)" >&2
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exit 1
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else
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newPath="$(PATH="${!pathName}" type -P "$arg0" || true)"
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fi
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else
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if [[ -z $oldPath ]]; then
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# If no interpreter is specified linux will use /bin/sh. Set
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# oldpath="/bin/sh" so that we get /nix/store/.../sh.
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oldPath="/bin/sh"
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fi
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newPath="$(PATH="${!pathName}" type -P "$(basename "$oldPath")" || true)"
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args="$arg0 $args"
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fi
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# Strip trailing whitespace introduced when no arguments are present
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newInterpreterLine="$newPath $args"
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newInterpreterLine=${newInterpreterLine%${newInterpreterLine##*[![:space:]]}}
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if [[ -n "$oldPath" && ( "$update" == true || "${oldPath:0:${#NIX_STORE}}" != "$NIX_STORE" ) ]]; then
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if [[ -n "$newPath" && "$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=${newInterpreterLine//\\/\\\\}
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# Preserve times, see: https://github.com/NixOS/nixpkgs/pull/33281
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timestamp=$(stat --printf "%y" "$f")
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sed -i -e "1 s|.*|#\!$escapedInterpreterLine|" "$f"
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touch --date "$timestamp" "$f"
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fi
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fi
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done < <(find "$@" -type f -perm -0100 -print0)
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}
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patchShebangsAuto () {
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if [[ -z "${dontPatchShebangs-}" && -e "$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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