3 files changed, 167 insertions, 0 deletions
diff --git a/modules.d/95resume/module-setup.sh b/modules.d/95resume/module-setup.sh
new file mode 100755
index 0000000..d255103
--- /dev/null
+++ b/modules.d/95resume/module-setup.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+
+# called by dracut
+check() {
+    swap_on_netdevice() {
+        local _dev
+        for _dev in "${swap_devs[@]}"; do
+            block_is_netdevice "$(get_maj_min "$_dev")" && return 0
+        done
+        return 1
+    }
+
+    # Only support resume if hibernation is currently on
+    # and no swap is mounted on a net device
+    [[ $hostonly ]] || [[ $mount_needs ]] && {
+        swap_on_netdevice || [[ -f /sys/power/resume && "$(< /sys/power/resume)" == "0:0" ]] || grep -rq '^\|[[:space:]]resume=' /proc/cmdline /etc/cmdline /etc/cmdline.d /etc/kernel/cmdline /usr/lib/kernel/cmdline 2> /dev/null && return 255
+    }
+
+    return 0
+}
+
+# called by dracut
+cmdline() {
+    local _resume
+
+    for dev in "${!host_fs_types[@]}"; do
+        [[ ${host_fs_types[$dev]} =~ ^(swap|swsuspend|swsupend)$ ]] || continue
+        _resume=$(shorten_persistent_dev "$(get_persistent_dev "$dev")")
+        [[ -n ${_resume} ]] && printf " resume=%s" "${_resume}"
+    done
+}
+
+# called by dracut
+install() {
+    local _bin
+    local _resumeconf
+
+    if [[ $hostonly_cmdline == "yes" ]]; then
+        _resumeconf=$(cmdline)
+        [[ $_resumeconf ]] && printf "%s\n" "$_resumeconf" >> "${initdir}/etc/cmdline.d/95resume.conf"
+    fi
+
+    # if systemd is included and has the hibernate-resume tool, use it and nothing else
+    if dracut_module_included "systemd" && [[ -x $dracutsysrootdir$systemdutildir/systemd-hibernate-resume ]]; then
+        inst_multiple -o \
+            "$systemdutildir"/system-generators/systemd-hibernate-resume-generator \
+            "$systemdsystemunitdir"/systemd-hibernate-resume@.service \
+            "$systemdutildir"/systemd-hibernate-resume
+        return 0
+    fi
+
+    # Optional uswsusp support
+    for _bin in /usr/sbin/resume /usr/lib/suspend/resume /usr/lib64/suspend/resume /usr/lib/uswsusp/resume /usr/lib64/uswsusp/resume; do
+        [[ -x $dracutsysrootdir${_bin} ]] && {
+            inst "${_bin}" /usr/sbin/resume
+            [[ $hostonly ]] && [[ -f $dracutsysrootdir/etc/suspend.conf ]] && inst -H /etc/suspend.conf
+            break
+        }
+    done
+
+    if ! dracut_module_included "systemd"; then
+        inst_hook cmdline 10 "$moddir/parse-resume.sh"
+    else
+        inst_script "$moddir/parse-resume.sh" /lib/dracut/parse-resume.sh
+    fi
+
+    inst_script "$moddir/resume.sh" /lib/dracut/resume.sh
+}
diff --git a/modules.d/95resume/parse-resume.sh b/modules.d/95resume/parse-resume.sh
new file mode 100755
index 0000000..75a905d
--- /dev/null
+++ b/modules.d/95resume/parse-resume.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+if resume=$(getarg resume=) && ! getarg noresume; then
+    export resume
+    echo "$resume" > /.resume
+else
+    unset resume
+fi
+
+resume="$(label_uuid_to_dev "$resume")"
+
+if splash=$(getarg splash=); then
+    export splash
+else
+    unset splash
+fi
+
+case "$splash" in
+    quiet)
+        a_splash="-P splash=y"
+        ;;
+    *)
+        a_splash="-P splash=n"
+        ;;
+esac
+
+if ! getarg noresume; then
+    if [ -n "$resume" ]; then
+        wait_for_dev /dev/resume
+
+        {
+            printf "KERNEL==\"%s\", ACTION==\"add|change\", SYMLINK+=\"resume\"\n" \
+                "${resume#/dev/}"
+            printf "SYMLINK==\"%s\", ACTION==\"add|change\", SYMLINK+=\"resume\"\n" \
+                "${resume#/dev/}"
+        } >> /etc/udev/rules.d/99-resume-link.rules
+
+        {
+            if [ -x /usr/sbin/resume ]; then
+                printf -- 'KERNEL=="%s", ' "${resume#/dev/}"
+                printf -- '%s' 'ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+                printf -- " RUN+=\"/sbin/initqueue --finished --unique --name 00resume /usr/sbin/resume %s \'%s\'\"\n" \
+                    "$a_splash" "$resume"
+                printf -- 'SYMLINK=="%s", ' "${resume#/dev/}"
+                printf -- '%s' 'ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+                printf -- " RUN+=\"/sbin/initqueue --finished --unique --name 00resume /usr/sbin/resume %s \'%s\'\"\n" \
+                    "$a_splash" "$resume"
+            fi
+
+            printf -- 'KERNEL=="%s", ' "${resume#/dev/}"
+            printf -- '%s' 'ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+            printf -- '%s\n' ' RUN+="/sbin/initqueue --finished --unique --name 00resume echo %M:%m > /sys/power/resume"'
+
+            printf -- 'SYMLINK=="%s", ' "${resume#/dev/}"
+            printf -- '%s' 'ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+            printf -- '%s\n' ' RUN+="/sbin/initqueue --finished --unique --name 00resume echo %M:%m  > /sys/power/resume"'
+        } >> /etc/udev/rules.d/99-resume.rules
+
+        # shellcheck disable=SC2016
+        printf '[ -e "%s" ] && { ln -fs "%s" /dev/resume 2> /dev/null; rm -f -- "$job" "%s/initqueue/timeout/resume.sh"; }\n' \
+            "$resume" "$resume" "$hookdir" >> "$hookdir"/initqueue/settled/resume.sh
+
+        {
+            printf -- "%s" 'warn "Cancelling resume operation. Device not found.";'
+            # shellcheck disable=SC2016
+            printf -- ' cancel_wait_for_dev /dev/resume; rm -f -- "$job" "%s/initqueue/settled/resume.sh";\n' "$hookdir"
+        } >> "$hookdir"/initqueue/timeout/resume.sh
+
+        mv /lib/dracut/resume.sh /lib/dracut/hooks/pre-mount/10-resume.sh
+    else
+        {
+            if [ -x /usr/sbin/resume ]; then
+                printf -- '%s' 'SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+                # shellcheck disable=SC2016
+                printf -- ' RUN+="/sbin/initqueue --finished --unique --name 00resume /usr/sbin/resume %s $tempnode"\n' "$a_splash"
+            fi
+            printf -- '%s' 'SUBSYSTEM=="block", ACTION=="add|change", ENV{ID_FS_TYPE}=="suspend|swsuspend|swsupend",'
+            printf -- '%s\n' ' RUN+="/sbin/initqueue --finished --unique --name 00resume echo %M:%m > /sys/power/resume"'
+        } >> /etc/udev/rules.d/99-resume.rules
+    fi
+fi
diff --git a/modules.d/95resume/resume.sh b/modules.d/95resume/resume.sh
new file mode 100755
index 0000000..c808880
--- /dev/null
+++ b/modules.d/95resume/resume.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+PATH=/usr/sbin:/usr/bin:/sbin:/bin
+
+[ -s /.resume -a -b "$resume" ] && {
+    # First try user level resume; it offers splash etc
+    case "$splash" in
+        quiet)
+            a_splash="-P splash=y"
+            ;;
+        *)
+            a_splash="-P splash=n"
+            ;;
+    esac
+    [ -x "$(command -v resume)" ] && command resume "$a_splash" "$resume"
+
+    (readlink -fn "$resume" > /sys/power/resume) > /.resume
+}