From 85793838bc917566d739b330255d11e941320b45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Mon, 13 Dec 2021 23:35:56 +0100
Subject: Add losetup.

---
 modules/losetup/files/dismantle-loop-device | 15 +++++++++++++++
 modules/losetup/files/loop@.service         | 12 ++++++++++++
 modules/losetup/files/setup-loop-device     | 16 ++++++++++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 modules/losetup/files/dismantle-loop-device
 create mode 100644 modules/losetup/files/loop@.service
 create mode 100755 modules/losetup/files/setup-loop-device

(limited to 'modules/losetup/files')

diff --git a/modules/losetup/files/dismantle-loop-device b/modules/losetup/files/dismantle-loop-device
new file mode 100644
index 0000000..be3f3a0
--- /dev/null
+++ b/modules/losetup/files/dismantle-loop-device
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+target_file="$1"
+safe_name="$(systemd-escape "$target_file")"
+
+set +x
+
+loop_device=$(readlink "/dev/loop-by-name/${safe_name}")
+rm "/dev/loop-by-name/${safe_name}"
+
+for part in "/dev/loop-by-name/${safe_name}"-p*; do
+	rm "$part"
+done
+
+losetup -d $loop_device
diff --git a/modules/losetup/files/loop@.service b/modules/losetup/files/loop@.service
new file mode 100644
index 0000000..e9dc008
--- /dev/null
+++ b/modules/losetup/files/loop@.service
@@ -0,0 +1,12 @@
+[Unit]
+Description=Loopback device for %I
+
+[Service]
+ExecStart=/usr/libexec/setup-loop-device "%I"
+ExecStop=/usr/libexec/dismantle-loop-device "%I"
+#ExecStopPost=rm /dev/loop-by-name/"%i"*
+#ExecStart=echo %I
+ExecStartPre=mkdir -p /dev/loop-by-name
+# Cant't have any dashes in filename, due to escaping rules
+# ExecStartPre=/bin/sh -c "grep -vq '-' <<< "%i""
+RemainAfterExit=yes
diff --git a/modules/losetup/files/setup-loop-device b/modules/losetup/files/setup-loop-device
new file mode 100755
index 0000000..4215273
--- /dev/null
+++ b/modules/losetup/files/setup-loop-device
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+target_file="$1"
+safe_name="$(systemd-escape "$target_file")"
+
+set +x
+
+loop_device=$(losetup --find --show "$target_file")
+
+ln -s $loop_device "/dev/loop-by-name/${safe_name}"
+
+for part in "${loop_device}"p*; do
+	last_two=${part:$[${#part}-2]}
+  ln -s $part \
+	  "/dev/loop-by-name/${safe_name}-${last_two}"
+done
-- 
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