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4b1b6ee6d1
Close #33281. Edits by vcunat: - use Eelco's idea: empty file instead of full copy - use longer name suffix to decrease the likelihood of collision
68 lines
2.7 KiB
Bash
68 lines
2.7 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 $PATH. E.g.,
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# /bin/sh will be rewritten to /nix/store/<hash>-some-bash/bin/sh.
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# /usr/bin/env gets special treatment so that ".../bin/env python" is
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# rewritten to /nix/store/<hash>/bin/python. Interpreters that are
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# already in the store are left untouched.
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fixupOutputHooks+=('if [ -z "$dontPatchShebangs" -a -e "$prefix" ]; then patchShebangs "$prefix"; fi')
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patchShebangs() {
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local dir="$1"
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header "patching script interpreter paths in $dir"
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local f
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local oldPath
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local newPath
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local arg0
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local args
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local oldInterpreterLine
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local newInterpreterLine
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find "$dir" -type f -perm -0100 | while read f; do
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if [ "$(head -1 "$f" | head -c+2)" != '#!' ]; then
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# missing shebang => not a script
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continue
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fi
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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 $(echo "$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 "unsupported interpreter directive \"$oldInterpreterLine\" (set dontPatchShebangs=1 and handle shebang patching yourself)"
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exit 1
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fi
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newPath="$(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="$(command -v "$(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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touch -r "$f" "$f.timestamp"
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sed -i -e "1 s|.*|#\!$escapedInterpreterLine|" "$f"
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touch -r "$f.timestamp" "$f"
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rm "$f.timestamp"
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fi
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fi
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done
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stopNest
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}
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