fetchbzr, fetchdarcs, fetchhg: use `rev` attr

This makes it match the behaviour of fetchgit and fetchsvn, so it's
easier to write scripts that support all of them.

2 files changed, 5 insertions, 5 deletions

diff --git a/pkgs/build-support/fetchdarcs/builder.sh b/pkgs/build-support/fetchdarcs/builder.sh
index efff5ff5ebf97..301deb98307ff 100644
--- a/pkgs/build-support/fetchdarcs/builder.sh
+++ b/pkgs/build-support/fetchdarcs/builder.sh
@@ -2,9 +2,9 @@ source $stdenv/setup
 
 tagtext=""
 tagflags=""
-if test -n "$tag"; then
-    tagtext="(tag $tag) "
-    tagflags="--tag=$tag"
+if test -n "$rev"; then
+    tagtext="(tag $rev) "
+    tagflags="--tag=$rev"
 elif test -n "$context"; then
     tagtext="(context) "
     tagflags="--context=$context"
diff --git a/pkgs/build-support/fetchdarcs/default.nix b/pkgs/build-support/fetchdarcs/default.nix
index 63e4ecde88a54..3c2e0524eea5c 100644
--- a/pkgs/build-support/fetchdarcs/default.nix
+++ b/pkgs/build-support/fetchdarcs/default.nix
@@ -1,4 +1,4 @@
-{stdenv, darcs, nix}: {url, tag ? null, context ? null, md5 ? "", sha256 ? ""}:
+{stdenv, darcs, nix}: {url, rev ? null, context ? null, md5 ? "", sha256 ? ""}:
 
 stdenv.mkDerivation {
   name = "fetchdarcs";
@@ -9,5 +9,5 @@ stdenv.mkDerivation {
   outputHashMode = "recursive";
   outputHash = if sha256 == "" then md5 else sha256;
   
-  inherit url tag context;
+  inherit url rev context;
 }