Bug#1089043: ucf: Environment sanitization breaks with multi-line values

[Ileana Dumitrescu]

I have also found a similar error with the environment sanitization for
when the environment has not been configured, while building zvbi [1].

  Setting up ucf (3.0044) ...
  ...
  Setting up libxml-sax-perl (1.02+dfsg-4) ...
  /usr/bin/ucfr: 12: unset: : bad variable name
  dpkg: error processing package libxml-sax-perl (--configure):


The patch below may work, but it is untested:

diff --git a/ucf b/ucf
index b627038..7c9a498 100755
--- a/ucf
+++ b/ucf
@@ -10,7 +10,7 @@ while read -r env ; do
        PATH|PWD|TERM) ;;
        DEB_*|DEBIAN_*|DEBCONF_*) ;;
        UCF_*) ;;
-       *) unset "$env" ;;
+       *) if [ test -n "$env" ]; then unset "$env"; fi ;;
     esac
 done<<EOF
 $(env)
diff --git a/ucfr b/ucfr
index f71f572..6e84ebe 100755
--- a/ucfr
+++ b/ucfr
@@ -9,7 +9,7 @@ while read -r env ; do
     case "$env" in
        PATH|PWD|TERM) ;;
        UCF_*) ;;
-       *) unset "$env" ;;
+       *) if [ test -n "$env" ]; then unset "$env"; fi ;;
     esac
 done<<EOF
 $(env)

[1] https://salsa.debian.org/debian/zvbi/-/jobs/6700217

--
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

installed libxml-sax-perl package post-installation script subprocess returned error exit status 2

OpenPGP_0x6570EA01146F7354.asc
Description: OpenPGP public key

OpenPGP_signature.asc
Description: OpenPGP digital signature