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nixpkgs/pkgs/applications/science/misc/openmodelica/omlibrary/fakegit.nix

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{ lib, stdenv, fetchgit, bash }:
let
mkscript = path: text: ''
mkdir -pv `dirname ${path}`
cat > ${path} <<"EOF"
#!${bash}/bin/bash
ME=$(basename ${path})
${text}
EOF
sed -i "s@%out@$out@g" ${path}
chmod +x ${path}
'';
hashname = r:
let
rpl = lib.replaceChars [ ":" "/" ] [ "_" "_" ];
in
(rpl r.url) + "-" + (rpl r.rev);
in
stdenv.mkDerivation {
name = "fakegit";
buildCommand = ''
mkdir -pv $out/repos
${lib.concatMapStrings
(r: "cp -r ${fetchgit r} $out/repos/${hashname r}\n")
(import ./src-libs.nix)}
${mkscript "$out/bin/checkout-git.sh" ''
if test "$#" -ne 4; then
echo "Usage: $0 DESTINATION URL GITBRANCH HASH"
exit 1
fi
DEST=$1
URL=`echo $2 | tr :/ __`
GITBRANCH=$3
REVISION=$4
REVISION=`echo $REVISION | tr :/ __`
rm -rf $DEST
mkdir -pv $DEST
echo "FAKEGIT cp -r %out/repos/$URL-$REVISION $DEST" >&2
cp -r %out/repos/$URL-$REVISION/* $DEST
chmod u+w -R $DEST
''}
'';
}