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rust build support: Find Cargo.lock file upwards in tree #30412

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rust build support: Find Cargo.lock file upwards in tree #30412

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13 changes: 12 additions & 1 deletion pkgs/build-support/rust/fetch-cargo-deps
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Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,18 @@ EOF
export CARGO_HOME=$out
cd $src

if [[ ! -f Cargo.lock ]]; then
find_upwards() {
[[ "$(realpath "$1")" == "/" ]] && return 1
if [ -f "$1/$2" ]; then
echo "$1/$2"
else
find_upwards "../$1" "$2"
fi
}

cargo_lock=$(find_upwards . "Cargo.lock")

if [[ -z "$cargo_lock" ]]; then
echo
echo "ERROR: The Cargo.lock file doesn't exist"
echo
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