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#!/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
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