[Debconf-devel] Bug#983425: debconf: please add support for DPKG_ROOT

[Johannes Schauer Marin Rodrigues]

Quoting Johannes 'josch' Schauer (2021-02-24 01:44:00)
> However, with the changes from above commits, the command will succeed.

while it will succeed, it will still not reproduce the desired result. Helmut
and I now have a set of scripts that compare a chroot created with DPKG_ROOT to
one without. With the patch above, the following will be printed when one sets
DEBCONF_DEBUG=developer:

Preparing to unpack .../libc6_2.31-12+dpkgroot1_amd64.deb ...
debconf (developer): frontend started
debconf (developer): Trying to find a templates file..
debconf (developer): Trying /tmp/mmdebstrap.Jo8V8wNPO_//var/lib/dpkg/tmp.ci/preinst.templates
debconf (developer): Trying /usr/share/debconf/templates/preinst.templates
debconf (developer): Couldn't find a templates file.
debconf (developer): frontend running, package name is 
debconf (developer): starting /tmp/mmdebstrap.Jo8V8wNPO_//var/lib/dpkg/tmp.ci/preinst install

The following patch fixes the situation:

diff -Nru debconf-1.5.75/frontend debconf-1.5.75+nmu1/frontend
--- debconf-1.5.75/frontend     2021-02-28 18:51:28.000000000 +0100
+++ debconf-1.5.75+nmu1/frontend        2021-06-22 13:28:25.000000000 +0200
@@ -44,10 +44,10 @@
 	# Avoid spurious title updates with triggered actions:
 	$no_title=1 if $action eq 'triggered';
 }
-elsif (-e "/var/lib/dpkg/tmp.ci/control") {
+elsif (-e "$ENV{DPKG_ROOT}/var/lib/dpkg/tmp.ci/control") {
 	# The preinst is running, presumably. Now it gets really ugly, because
 	# I have to parse the control file.
-	open (CONTROL, "< /var/lib/dpkg/tmp.ci/control")
+	open (CONTROL, "< $ENV{DPKG_ROOT}/var/lib/dpkg/tmp.ci/control")
 		|| die "Debconf: unable to open control file: $!";
 	while (<CONTROL>) {
 		if (/^Package: (.*)/) {
EOF

Is it desirable that debconf succeeds even if it cannot find the templates file
and cannot figure out the package name?

Thanks!

cheers, josch
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