Allow running all the tests with the daemon

When `NIX_DAEMON_PACKAGE` is set, make all the tests use the Nix daemon.
That way we can test every piece of Nix functionality both with and
without the daemon.

Tests for which using the daemon isn’t possible or doesn’t make sens can
selectively be disabled with `needLocalStore`

tests/ca/build-with-garbage-path.sh

@@ -3,7 +3,8 @@
 # Regression test for https://github.com/NixOS/nix/issues/4858
 
 source common.sh
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
+
+requireDaemonNewerThan "2.4pre20210621"
 
 # Get the output path of `rootCA`, and put some garbage instead
 outPath="$(nix-build ./content-addressed.nix -A rootCA --no-out-link)"

tests/ca/common.sh

@@ -1 +1,5 @@
 source ../common.sh
+
+sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
+
+restartDaemon

tests/ca/concurrent-builds.sh

@@ -5,7 +5,7 @@
 
 source common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
+buggyNeedLocalStore "For some reason, this deadlocks with the daemon"
 
 export NIX_TESTS_CA_BY_DEFAULT=1
 

tests/ca/duplicate-realisation-in-closure.sh

@@ -1,5 +1,7 @@
 source ./common.sh
 
+requireDaemonNewerThan "2.4pre20210625"
+
 sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
 
 export REMOTE_STORE_DIR="$TEST_ROOT/remote_store"

tests/ca/gc.sh

@@ -4,8 +4,6 @@
 
 source common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
-
 export NIX_TESTS_CA_BY_DEFAULT=1
 
 cd ..

tests/ca/post-hook.sh

@@ -2,6 +2,8 @@
 
 source common.sh
 
+requireDaemonNewerThan "2.4pre20210626"
+
 sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/ca/recursive.sh

@@ -2,6 +2,8 @@
 
 source common.sh
 
+requireDaemonNewerThan "2.4pre20210623"
+
 sed -i 's/experimental-features .*/& ca-derivations ca-references nix-command flakes/' "$NIX_CONF_DIR"/nix.conf
 
 export NIX_TESTS_CA_BY_DEFAULT=1

tests/ca/substitute.sh

@@ -4,7 +4,7 @@
 
 source common.sh
 
-sed -i 's/experimental-features .*/& ca-derivations ca-references/' "$NIX_CONF_DIR"/nix.conf
+needLocalStore "“--no-require-sigs” can’t be used with the daemon"
 
 rm -rf $TEST_ROOT/binary_cache