New config: BUILD_HOME, to be able to set the value of HOME while building. Default it to /nonexistent to prevent builds from writing to /home.

This reverts what was done for #170762

Closes: #441052

3 files changed, 15 insertions, 1 deletions

diff --git a/pbuilder-buildpackage b/pbuilder-buildpackage
index 5e8ef08..310658a 100755
--- a/pbuilder-buildpackage
+++ b/pbuilder-buildpackage
@@ -76,7 +76,7 @@ esac
 BUILDRESULTUID="${BUILDRESULTUID:-${SUDO_UID:-0}}"
 BUILDRESULTGID="${BUILDRESULTGID:-${SUDO_GID:-0}}"
 
-export HOME="$BUILDDIR"
+export HOME="$BUILD_HOME"
 
 echobacktime
 extractbuildplace 
diff --git a/pbuilderrc b/pbuilderrc
index 069009e..b4ab567 100644
--- a/pbuilderrc
+++ b/pbuilderrc
@@ -7,6 +7,11 @@ BASETGZ=/var/cache/pbuilder/base.tgz
 BUILDPLACE=/var/cache/pbuilder/build
 # directory inside the chroot where the build happens. See #789404
 BUILDDIR=/build
+# what be used as value for HOME during builds.  See #441052
+# The default value prevents builds to write on HOME, which is prevented on
+# Debian buildds too.  You can set it to $BUILDDIR to get a working HOME, if
+# you need to.
+BUILD_HOME=/nonexistent
 MIRRORSITE=http://httpredir.debian.org/debian
 #OTHERMIRROR="deb http://www.home.com/updates/ ./"
 #export http_proxy=http://your-proxy:8080/
diff --git a/pbuilderrc.5 b/pbuilderrc.5
index 4f7d1f2..3d461b8 100644
--- a/pbuilderrc.5
+++ b/pbuilderrc.5
@@ -440,6 +440,15 @@ or
 from the host system into the chroot.  If the directory specified here
 exists and contains one of the copied files (without the leading /etc) that
 file will be copied from here instead of the system one.
+.TP
+.BI "BUILD_HOME=" "/nonexistent"
+Set the what the
+.B HOME
+environment variable points to during the builds.  It defaults to a non-existing
+directory to prevent builds from writing to HOME, which is reserved to users.
+If you need a working HOME you can set it to
+.B $BUILDDIR
+instead.
 
 .SH "AUTHOR"
 Initial coding, and main maintenance is done by