From 15364cb1db2649f27e759f58d0af7f27310304de Mon Sep 17 00:00:00 2001
From: Logan Glasson <logan@glasson.nz>
Date: Sun, 14 Mar 2021 18:17:23 +1300
Subject: [PATCH] nix-prefetch-git: fix checkout_ref() for "dumb http"
 repositories

The checkout_ref() function was written against Git 1.6.5, just before "smart
http" repositories were implemented in Git 1.6.6. In 1.6.5, the `--depth`
parameter is ignored when fetching from a dumb http repository. From 1.6.6,
this scenario causes a failure. This change updates the comment and falls back
to fetching without `--depth`.
---
 pkgs/build-support/fetchgit/nix-prefetch-git | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pkgs/build-support/fetchgit/nix-prefetch-git b/pkgs/build-support/fetchgit/nix-prefetch-git
index f2df9d9a86932..675ae992f3917 100755
--- a/pkgs/build-support/fetchgit/nix-prefetch-git
+++ b/pkgs/build-support/fetchgit/nix-prefetch-git
@@ -182,8 +182,10 @@ checkout_ref(){
     fi
 
     if test -n "$ref"; then
-        # --depth option is ignored on http repository.
-        clean_git fetch ${builder:+--progress} --depth 1 origin +"$ref" || return 1
+        # --depth option fails on dumb http repositories.
+        clean_git fetch ${builder:+--progress} --depth 1 origin +"$ref" ||
+          clean_git fetch ${builder:+--progress} origin +"$ref" ||
+          return 1
         clean_git checkout -b "$branchName" FETCH_HEAD || return 1
     else
         return 1