From 79ec61396fa6c6d364e4f3f74eed829fe3461dc6 Mon Sep 17 00:00:00 2001
From: Stephen Gutekanst <stephen@hexops.com>
Date: Fri, 26 Aug 2022 11:54:18 -0700
Subject: [PATCH] dev: update scripts to push subrepos

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
---
 dev/pull-subrepos.sh   |  6 -----
 dev/push-subrepos.sh   | 61 ++++++++++++++++++++++++++++++++++++++----
 dev/update-subrepos.sh | 17 ------------
 3 files changed, 56 insertions(+), 28 deletions(-)
 delete mode 100755 dev/pull-subrepos.sh
 delete mode 100755 dev/update-subrepos.sh

diff --git a/dev/pull-subrepos.sh b/dev/pull-subrepos.sh
deleted file mode 100755
index 84ba4c98..00000000
--- a/dev/pull-subrepos.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-set -exuo pipefail
-cd "$(dirname "${BASH_SOURCE[0]}")"/..
-
-./dev/update-subrepos.sh
-git subtree pull --prefix glfw mach-glfw main
diff --git a/dev/push-subrepos.sh b/dev/push-subrepos.sh
index fe36fd4c..707ea944 100755
--- a/dev/push-subrepos.sh
+++ b/dev/push-subrepos.sh
@@ -1,8 +1,59 @@
 #!/usr/bin/env bash
-set -exuo pipefail
+set -euo pipefail
 cd "$(dirname "${BASH_SOURCE[0]}")"/..
 
-./dev/update-subrepos.sh
-git subtree push --prefix libs/glfw mach-glfw main
-git subtree push --prefix libs/gpu-dawn mach-gpu-dawn main
-git subtree push --prefix libs/freetype mach-freetype main
+push_subrepo() {
+    local project=$1
+
+    echo "    ----------------------------------------------------------------------------"
+    echo "    | 🚀🐒 Preparing: mach-$project"
+    echo "    ----------------------------------------------------------------------------"
+    cp -R staging-clean staging/
+    cd staging/
+
+    # Rewrite e.g. libs/freetype/ -> freetype/ so we have Git history for that subrepo in one path
+    # only (git subtree cannot follow renames.) For glfw, gpu-dawn, and freetype they were in the
+    # root before being under libs/ and so this is required to generate the proper history.
+    if [[ "$project" == "glfw" ]]; then
+        # glfw has an unfortunately non-linear history, and so we can't preserve commit hashes
+        # or else the subtree push cannot rebuild history properly.
+        git filter-repo --force \
+            --path $project \
+            --path "libs/$project" \
+            --path-rename libs/$project:$project
+    else
+        git filter-repo --force \
+            --preserve-commit-hashes \
+            --path $project \
+            --path "libs/$project" \
+            --path-rename libs/$project:$project
+    fi
+
+    # Push changes to the external subrepo.
+    if [ -n "${GITHUB_ACTIONS:-}" ]; then
+        git remote add -f "mach-$project" "https://slimsag:$ACCESS_TOKEN@github.com/hexops/mach-$project" || true
+    else
+        git remote add -f "mach-$project" "git@github.com:hexops/mach-$project" || true
+    fi
+    git fetch "mach-$project"
+
+    echo "    ----------------------------------------------------------------------------"
+    echo "    | 🚀🐒 Pushing: mach-$project"
+    echo "    ----------------------------------------------------------------------------"
+    git subtree push --prefix "$project" "mach-$project" main
+
+    cd ..
+    rm -rf staging/
+    echo "    ----------------------------------------------------------------------------"
+    echo "    | 🚀🐒 Finished: mach-$project"
+    echo "    ----------------------------------------------------------------------------"
+}
+
+rm -rf staging-clean/ staging/
+git clone https://github.com/hexops/mach staging-clean
+
+push_subrepo 'glfw'
+push_subrepo 'gpu-dawn'
+push_subrepo 'freetype'
+
+rm -rf staging-clean
diff --git a/dev/update-subrepos.sh b/dev/update-subrepos.sh
deleted file mode 100755
index 02a57c60..00000000
--- a/dev/update-subrepos.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-set -exuo pipefail
-cd "$(dirname "${BASH_SOURCE[0]}")"/..
-
-if [ -n "${GITHUB_ACTIONS:-}" ]; then
-    git remote add -f mach-glfw "https://slimsag:$ACCESS_TOKEN@github.com/hexops/mach-glfw" || true
-    git remote add -f mach-gpu-dawn "https://slimsag:$ACCESS_TOKEN@github.com/hexops/mach-gpu-dawn" || true
-    git remote add -f mach-freetype "https://slimsag:$ACCESS_TOKEN@github.com/hexops/mach-freetype" || true
-else
-    git remote add -f mach-glfw git@github.com:hexops/mach-glfw || true
-    git remote add -f mach-gpu-dawn git@github.com:hexops/mach-gpu-dawn || true
-    git remote add -f mach-freetype git@github.com:hexops/mach-freetype || true
-fi
-
-git fetch mach-glfw
-git fetch mach-gpu-dawn
-git fetch mach-freetype