depot/third_party/nixpkgs/pkgs/build-support/fetchgit/builder.sh

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# tested so far with:
# - no revision specified and remote has a HEAD which is used
# - revision specified and remote has a HEAD
# - revision specified and remote without HEAD
#
if [ -e "$NIX_ATTRS_SH_FILE" ]; then . "$NIX_ATTRS_SH_FILE"; elif [ -f .attrs.sh ]; then . .attrs.sh; fi
source $stdenv/setup
echo "exporting $url (rev $rev) into $out"
$SHELL $fetcher --builder --url "$url" --out "$out" --rev "$rev" \
${leaveDotGit:+--leave-dotGit} \
${fetchLFS:+--fetch-lfs} \
${deepClone:+--deepClone} \
${fetchSubmodules:+--fetch-submodules} \
${sparseCheckout:+--sparse-checkout "$sparseCheckout"} \
${nonConeMode:+--non-cone-mode} \
${branchName:+--branch-name "$branchName"}
runHook postFetch