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auto-patchelf: don't use grep -q, as it causes Broken pipe (#56958)

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This rare sitation was caught when building zoom-us package:
```
automatically fixing dependencies for ELF files
/nix/store/71d65fplq44y9yn2fvkpn2d3hrszracd-auto-patchelf-hook/nix-support/setup-hook: line 213: echo: write error: Broken pipe
/nix/store/71d65fplq44y9yn2fvkpn2d3hrszracd-auto-patchelf-hook/nix-support/setup-hook: line 210: echo: write error: Broken pipe
```

The worst is that derivation continued and resulted into broken package:
https://github.com/NixOS/nixpkgs/pull/55566#issuecomment-470065690

I hope, replacing `grep -q` with `grep` will remove this race condition.
This commit is contained in:
Danylo Hlynskyi 2019-03-20 14:57:59 +02:00 committed by GitHub
parent 52c3ee6c4d
commit de0612c46c
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 4 deletions
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11
pkgs/build-support/setup-hooks/auto-patchelf.sh
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@ -15,8 +15,10 @@ isExecutable() {
# *or* there is an INTERP section. This also catches position-independent
# executables, as they typically have an INTERP section but their ELF type
# is DYN.
LANG=C readelf -h -l "$1" 2> /dev/null \
| grep -q '^ *Type: *EXEC\>\|^ *INTERP\>'
isExeResult="$(LANG=C readelf -h -l "$1" 2> /dev/null \
| grep '^ *Type: *EXEC\>\|^ *INTERP\>')"
# not using grep -q, because it can cause Broken pipe
[ -n "$isExeResult" ]
}
# We cache dependencies so that we don't need to search through all of them on
@ -207,10 +209,11 @@ autoPatchelf() {
isELF "$file" || continue
segmentHeaders="$(LANG=C readelf -l "$file")"
# Skip if the ELF file doesn't have segment headers (eg. object files).
echo "$segmentHeaders" | grep -q '^Program Headers:' || continue
# not using grep -q, because it can cause Broken pipe
[ -n "$(echo "$segmentHeaders" | grep '^Program Headers:')" ] || continue
if isExecutable "$file"; then
# Skip if the executable is statically linked.
echo "$segmentHeaders" | grep -q "^ *INTERP\\>" || continue
[ -n "$(echo "$segmentHeaders" | grep "^ *INTERP\\>")" ] || continue
fi
autoPatchelfFile "$file"
done < <(find "$@" ${norecurse:+-maxdepth 1} -type f -print0)