dirname not available in initramfs

[aleblanc]

There is a call to dirname on line 11 of /usr/share/initramfs-tools/scripts/local-top/cryptroot, but dirname is not included in the initramfs.
This doesn't seem to cause any problems on a new system, but it caused me some problems when trying to debug some changes I made to my initramfs.

Description: Ubuntu 14.04.2 LTS
Release: 14.04

initramfs-tools:
  Installed: 0.103ubuntu4.2
  Candidate: 0.103ubuntu4.2
  Version table:
 *** 0.103ubuntu4.2 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.103ubuntu4 0
        500 http://gb.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: initramfs-tools 0.103ubuntu4.2
ProcVersionSignature: Ubuntu 3.13.0-57.95-generic 3.13.11-ckt21
Uname: Linux 3.13.0-57-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Jul 13 02:57:43 2015
InstallationDate: Installed on 2015-07-01 (11 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: initramfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)

[Andy Whitcroft (apw)]

Confirmed that in wily we get a dirname link in the initrds as generated.

[Simon Déziel (sdeziel)]

This also affects me on 14.04.4.

I've noticed that booting with "debug" instead of "quiet splash" resolves the issue. Maybe it's just a timing issue?