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

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{stdenv, subversion, sshSupport ? false, openssh ? null}:
{url, rev ? "HEAD", md5 ? "", sha256 ? "",
ignoreExternals ? false, ignoreKeywords ? false, name ? null}:
let
repoName = with stdenv.lib;
let
fst = head;
snd = l: head (tail l);
trd = l: head (tail (tail l));
path_ =
(p: if head p == "" then tail p else p) # ~ drop final slash if any
(reverseList (splitString "/" url));
path = [ (removeSuffix "/" (head path_)) ] ++ (tail 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;
name_ = if name == null then "${repoName}-r${toString rev}" else name;
in
stdenv.mkDerivation {
name = name_;
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 ignoreKeywords;
impureEnvVars = stdenv.lib.fetchers.proxyImpureEnvVars;
preferLocalBuild = true;
}