nixpkgs/pkgs/build-support/fetchsvn/default.nix

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{stdenv, subversion, sshSupport ? false, openssh ? null}:
{url, rev ? "HEAD", md5 ? "", sha256 ? "", ignoreExternals ? false}:
let
repoName = with stdenv.lib;
let
fst = head;
snd = l: head (tail l);
trd = l: head (tail (tail l));
path_ = reverseList (splitString "/" url);
path = if head path_ == "" then tail path_ else path_;
in
# ../repo/trunk -> repo
if fst path == "trunk" then snd path
# ../repo/branches/branch -> repo-branch
else if snd path == "branches" then "${trd path}-${fst path}"
# ../repo/tags/tag -> repo-tag
else if snd path == "tags" then "${trd path}-${fst path}"
# ../repo (no trunk) -> repo
else fst path;
in
stdenv.mkDerivation {
name = "${repoName}-r${toString rev}";
builder = ./builder.sh;
buildInputs = [subversion];
outputHashAlgo = if sha256 == "" then "md5" else "sha256";
outputHashMode = "recursive";
outputHash = if sha256 == "" then md5 else sha256;
inherit url rev sshSupport openssh ignoreExternals;
impureEnvVars = [
# We borrow these environment variables from the caller to allow
# easy proxy configuration. This is impure, but a fixed-output
# derivation like fetchurl is allowed to do so since its result is
# by definition pure.
"http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
];
}