[PATCH v3] Move AUR_OVERWRITE privilege check from git/auth to git/update

[Johannes Löthberg]

git/auth is run as an AutherizedKeysCommand which does not get the
environment variables passed to it, so AUR_OVERWRITE always got
hard-set to '0' by it.  Instead we need to perform the actual privilege
check in git/update instead.

Signed-off-by: Johannes Löthberg <johannes at kyriasis.com>
---
Removed unrelated garbage README change

 aurweb/git/auth.py       |  1 -
 aurweb/git/update.py     |  2 +-
 test/t1100-git-auth.sh   | 17 -----------------
 test/t1300-git-update.sh | 14 +++++++++++++-
 4 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/aurweb/git/auth.py b/aurweb/git/auth.py
index b7819a9..828ed4e 100755
--- a/aurweb/git/auth.py
+++ b/aurweb/git/auth.py
@@ -53,7 +53,6 @@ def main():
     env_vars = {
         'AUR_USER': user,
         'AUR_PRIVILEGED': '1' if account_type > 1 else '0',
-        'AUR_OVERWRITE' : os.environ.get('AUR_OVERWRITE', '0') if account_type > 1 else '0',
     }
     key = keytype + ' ' + keytext
 
diff --git a/aurweb/git/update.py b/aurweb/git/update.py
index f681ddb..da48eb3 100755
--- a/aurweb/git/update.py
+++ b/aurweb/git/update.py
@@ -238,7 +238,7 @@ def main():
     user = os.environ.get("AUR_USER")
     pkgbase = os.environ.get("AUR_PKGBASE")
     privileged = (os.environ.get("AUR_PRIVILEGED", '0') == '1')
-    allow_overwrite = (os.environ.get("AUR_OVERWRITE", '0') == '1')
+    allow_overwrite = (os.environ.get("AUR_OVERWRITE", '0') == '1') and privileged
     warn_or_die = warn if privileged else die
 
     if len(sys.argv) == 2 and sys.argv[1] == "restore":
diff --git a/test/t1100-git-auth.sh b/test/t1100-git-auth.sh
index dd20bea..71d526f 100755
--- a/test/t1100-git-auth.sh
+++ b/test/t1100-git-auth.sh
@@ -25,21 +25,4 @@ test_expect_success 'Test authentication with a wrong key.' '
 	test_must_be_empty out
 '
 
-test_expect_success 'Test AUR_OVERWRITE passthrough.' '
-	AUR_OVERWRITE=1 \
-	"$GIT_AUTH" "$AUTH_KEYTYPE_TU" "$AUTH_KEYTEXT_TU" >out &&
-	grep -q AUR_OVERWRITE=1 out
-'
-
-test_expect_success 'Make sure that AUR_OVERWRITE is unset by default.' '
-	"$GIT_AUTH" "$AUTH_KEYTYPE_TU" "$AUTH_KEYTEXT_TU" >out &&
-	grep -q AUR_OVERWRITE=0 out
-'
-
-test_expect_success 'Make sure regular users cannot set AUR_OVERWRITE.' '
-	AUR_OVERWRITE=1 \
-	"$GIT_AUTH" "$AUTH_KEYTYPE_USER" "$AUTH_KEYTEXT_USER" >out &&
-	grep -q AUR_OVERWRITE=0 out
-'
-
 test_done
diff --git a/test/t1300-git-update.sh b/test/t1300-git-update.sh
index b9c4f53..06d1498 100755
--- a/test/t1300-git-update.sh
+++ b/test/t1300-git-update.sh
@@ -137,7 +137,19 @@ test_expect_success 'Performing a non-fast-forward ref update as Trusted User.'
 	test_cmp expected actual
 '
 
-test_expect_success 'Performing a non-fast-forward ref update with AUR_OVERWRITE=1.' '
+test_expect_success 'Performing a non-fast-forward ref update as normal user with AUR_OVERWRITE=1.' '
+	old=$(git -C aur.git rev-parse HEAD) &&
+	new=$(git -C aur.git rev-parse HEAD^) &&
+	cat >expected <<-EOD &&
+	error: denying non-fast-forward (you should pull first)
+	EOD
+	test_must_fail \
+	env AUR_USER=user AUR_PKGBASE=foobar AUR_PRIVILEGED=0 AUR_OVERWRITE=1 \
+	"$GIT_UPDATE" refs/heads/master "$old" "$new" 2>&1 &&
+	test_cmp expected actual
+'
+
+test_expect_success 'Performing a non-fast-forward ref update as Trusted User with AUR_OVERWRITE=1.' '
 	old=$(git -C aur.git rev-parse HEAD) &&
 	new=$(git -C aur.git rev-parse HEAD^) &&
 	AUR_USER=tu AUR_PKGBASE=foobar AUR_PRIVILEGED=1 AUR_OVERWRITE=1 \
-- 
2.16.0