Add the pre-build hook.

This hook can be used to set system-specific per-derivation build
settings that don't fit into the derivation model and are too complex or
volatile to be hard-coded into nix. Currently, the pre-build hook can
only add chroot dirs/files through the interface, but it also has full
access to the chroot root.

The specific use case for this is systems where the operating system ABI
is more complex than just the kernel-support system calls. For example,
on OS X there is a set of system-provided frameworks that can reliably
be accessed by any program linked to them, no matter the version the
program is running on. Unfortunately, those frameworks do not
necessarily live in the same locations on each version of OS X, nor do
their dependencies, and thus nix needs to know the specific version of
OS X currently running in order to make those frameworks available. The
pre-build hook is a perfect mechanism for doing just that.

3 files changed, 41 insertions, 0 deletions

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 1fc5d4181d57..08b647cd6192 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1969,6 +1969,42 @@ void DerivationGoal::startBuilder()
                 }
     }
 
+    if (settings.preBuildHook != "") {
+        printMsg(lvlChatty, format("executing pre-build hook ‘%1%’")
+            % settings.preBuildHook);
+        auto args = useChroot ? Strings({drvPath, chrootRootDir}) :
+            Strings({ drvPath });
+        enum BuildHookState {
+            stBegin,
+            stExtraChrootDirs
+        };
+        auto state = stBegin;
+        auto lines = runProgram(settings.preBuildHook, false, args);
+        auto lastPos = std::string::size_type{0};
+        for (auto nlPos = lines.find('\n'); nlPos != string::npos;
+                nlPos = lines.find('\n', lastPos)) {
+            auto line = std::string{lines, lastPos, nlPos};
+            lastPos = nlPos + 1;
+            if (state == stBegin) {
+                if (line == "extra-chroot-dirs") {
+                    state = stExtraChrootDirs;
+                } else {
+                    throw Error(format("unknown pre-build hook command ‘%1%’")
+                        % line);
+                }
+            } else if (state == stExtraChrootDirs) {
+                if (line == "") {
+                    state = stBegin;
+                } else {
+                    auto p = line.find('=');
+                    if (p == string::npos)
+                        dirsInChroot[line] = line;
+                    else
+                        dirsInChroot[string(line, 0, p)] = string(line, p + 1);
+                }
+            }
+        }
+    }
 
     /* Run the builder. */
     printMsg(lvlChatty, format("executing builder ‘%1%’") % drv.builder);
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 052ca45ccc46..d5615d93c7d0 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -182,6 +182,7 @@ void Settings::update()
     _get(logServers, "log-servers");
     _get(enableImportNative, "allow-unsafe-native-code-during-evaluation");
     _get(useCaseHack, "use-case-hack");
+    _get(preBuildHook, "pre-build-hook");
 
     string subs = getEnv("NIX_SUBSTITUTERS", "default");
     if (subs == "default") {
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 195558dd3e99..60b11afe6088 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -206,6 +206,10 @@ struct Settings {
     /* Whether the importNative primop should be enabled */
     bool enableImportNative;
 
+    /* The hook to run just before a build to set derivation-specific
+       build settings */
+    Path preBuildHook;
+
 private:
     SettingsMap settings, overrides;