Add rebuild-initramfs script

PKGBUILD

@@ -1,5 +1,5 @@
 pkgname=eos-systemd-boot
-pkgver=0.02
+pkgver=0.03
 pkgrel=1
 pkgdesc='Enables systemd-boot automation using kernel-install on EndeavourOS'
 arch=(any)
@@ -14,6 +14,9 @@ package()
     # install the package files
     cp -a ${srcdir}/${pkgname}/src/usr ${pkgdir}
 
+    # set the permissions on the files in /usr/bin
+    chmod 755 ${pkgdir}/usr/bin/rebuild-initramfs
+
     # mask the default loaderentry creator
     mkdir -p "${pkgdir}/etc/kernel/install.d"
     touch "${pkgdir}/etc/kernel/install.d/90-loaderentry.install"

src/usr/bin/rebuild-initramfs

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+
+# Rebuilds all the initramsfs in a systemd-boot system using kernel-install
+
+# Find the configured esp
+esp=$(bootctl -p)
+
+# Prepare the efi partition for kernel-install
+machineid=$(cat /etc/machine-id)
+if [[ ${machineid} ]]; then
+    mkdir ${esp}/${machineid}
+else
+    echo "Failed to get the machine ID"
+    exit
+fi
+
+# Run kernel install for all the installed kernels
+while read -r kernel; do
+    kernelversion=$(basename "${kernel%/vmlinuz}")
+    mkdir -p ${esp}/${machineid}/${kernelversion}
+    echo "Generating initramfs for kernel ${kernelversion}"
+    mkinitcpio -k ${kernelversion} -g ${esp}/${machineid}/${kernelversion}/initrd
+    echo "Generating fallback initramfs for kernel ${kernelversion}"
+    mkinitcpio -S autodetect -k ${kernelversion} -g ${esp}/${machineid}/${kernelversion}/initrd-fallback
+done < <(find /usr/lib/modules -maxdepth 2 -type f -name vmlinuz)