Revert "systemd: use sd-switch"

This reverts commit 9c0fe3957bb91128d5d3599e289fe9344a293ece.

1 files changed, 114 insertions, 0 deletions

diff --git a/modules/systemd-activate.sh b/modules/systemd-activate.sh
new file mode 100644
index 00000000000..1c464693cfc
--- /dev/null
+++ b/modules/systemd-activate.sh
@@ -0,0 +1,114 @@
+#!/usr/bin/env bash
+
+function isStartable() {
+  local service="$1"
+  [[ $(systemctl --user show -p RefuseManualStart "$service") == *=no ]]
+}
+
+function isStoppable() {
+  if [[ -v oldGenPath ]] ; then
+    local service="$1"
+    [[ $(systemctl --user show -p RefuseManualStop "$service") == *=no ]]
+  fi
+}
+
+function systemdPostReload() {
+  local workDir
+  workDir="$(mktemp -d)"
+
+  if [[ -v oldGenPath ]] ; then
+    local oldUserServicePath="$oldGenPath/home-files/.config/systemd/user"
+  fi
+
+  local newUserServicePath="$newGenPath/home-files/.config/systemd/user"
+  local oldServiceFiles="$workDir/old-files"
+  local newServiceFiles="$workDir/new-files"
+  local servicesDiffFile="$workDir/diff-files"
+
+  if [[ ! (-v oldUserServicePath && -d "$oldUserServicePath") \
+      && ! -d "$newUserServicePath" ]]; then
+    return
+  fi
+
+  if [[ ! (-v oldUserServicePath && -d "$oldUserServicePath") ]]; then
+    touch "$oldServiceFiles"
+  else
+    find "$oldUserServicePath" \
+      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
+      | sort \
+      > "$oldServiceFiles"
+  fi
+
+  if [[ ! -d "$newUserServicePath" ]]; then
+    touch "$newServiceFiles"
+  else
+    find "$newUserServicePath" \
+      -maxdepth 1 -name '*.service' -exec basename '{}' ';' \
+      | sort \
+      > "$newServiceFiles"
+  fi
+
+  diff \
+    --new-line-format='+%L' \
+    --old-line-format='-%L' \
+    --unchanged-line-format=' %L' \
+    "$oldServiceFiles" "$newServiceFiles" \
+    > "$servicesDiffFile" || true
+
+  local -a maybeRestart=( $(grep '^ ' "$servicesDiffFile" | cut -c2-) )
+  local -a maybeStop=( $(grep '^-' "$servicesDiffFile" | cut -c2-) )
+  local -a maybeStart=( $(grep '^+' "$servicesDiffFile" | cut -c2-) )
+  local -a toRestart=( )
+  local -a toStop=( )
+  local -a toStart=( )
+
+  for f in "${maybeRestart[@]}" ; do
+    if isStoppable "$f" \
+        && isStartable "$f" \
+        && systemctl --quiet --user is-active "$f" \
+        && ! cmp --quiet \
+            "$oldUserServicePath/$f" \
+            "$newUserServicePath/$f" ; then
+      toRestart+=("$f")
+    fi
+  done
+
+  for f in "${maybeStop[@]}" ; do
+    if isStoppable "$f" ; then
+      toStop+=("$f")
+    fi
+  done
+
+  for f in "${maybeStart[@]}" ; do
+    if isStartable "$f" ; then
+      toStart+=("$f")
+    fi
+  done
+
+  rm -r "$workDir"
+
+  local sugg=""
+
+  if [[ -n "${toRestart[@]}" ]] ; then
+    sugg="${sugg}systemctl --user restart ${toRestart[@]}\n"
+  fi
+
+  if [[ -n "${toStop[@]}" ]] ; then
+    sugg="${sugg}systemctl --user stop ${toStop[@]}\n"
+  fi
+
+  if [[ -n "${toStart[@]}" ]] ; then
+    sugg="${sugg}systemctl --user start ${toStart[@]}\n"
+  fi
+
+  if [[ -n "$sugg" ]] ; then
+    echo "Suggested commands:"
+    echo -n -e "$sugg"
+  fi
+}
+
+oldGenPath="$1"
+newGenPath="$2"
+
+$DRY_RUN_CMD systemctl --user daemon-reload
+systemdPostReload