ensure proper teardown in dpkg error cases

We have to properly close our pseudo terminals even in error cases
before we call post-invoke scripts. This is done now by breaking from
the dpkg calling loop instead of copying the handling, which did it in
the wrong order before.

This also ensures that our state file is written in error cases to
record autobit and co as this was forgotten before.

Closes: 738969

apt-pkg/deb/dpkgpm.cc

@@ -1530,28 +1530,18 @@ bool pkgDPkgPM::GoNoABIBreak(APT::Progress::PackageManager *progress)
 	 // here but keep the loop going and just report it as a error
 	 // for later
 	 bool const stopOnError = _config->FindB("Dpkg::StopOnError",true);
-	 
-	 if(stopOnError)
-	    RunScripts("DPkg::Post-Invoke");
 
-	 if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV) 
+	 if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
 	    strprintf(d->dpkg_error, "Sub-process %s received a segmentation fault.",Args[0]);
 	 else if (WIFEXITED(Status) != 0)
 	    strprintf(d->dpkg_error, "Sub-process %s returned an error code (%u)",Args[0],WEXITSTATUS(Status));
-	 else 
+	 else
 	    strprintf(d->dpkg_error, "Sub-process %s exited unexpectedly",Args[0]);
+	 _error->Error("%s", d->dpkg_error.c_str());
 
-	 if(d->dpkg_error.size() > 0)
-	    _error->Error("%s", d->dpkg_error.c_str());
-
-	 if(stopOnError) 
-	 {
-	    CloseLog();
-            StopPtyMagic();
-            d->progress->Stop();
-	    return false;
-	 }
-      }      
+	 if(stopOnError)
+	    break;
+      }
    }
    // dpkg is done at this point
    d->progress->Stop();
@@ -1582,7 +1572,7 @@ bool pkgDPkgPM::GoNoABIBreak(APT::Progress::PackageManager *progress)
    }
 
    Cache.writeStateFile(NULL);
-   return true;
+   return d->dpkg_error.empty();
 }
 
 void SigINT(int /*sig*/) {

test/integration/test-apt-progress-fd-error-postinst

@@ -1,22 +0,0 @@
-#!/bin/sh
-set -e
-
-TESTDIR=$(readlink -f $(dirname $0))
-. $TESTDIR/framework
-
-setupenvironment
-configarchitecture 'amd64' 'i386'
-
-mkdir -p DEBIAN/
-echo "#!/bin/sh\nexit 1" > DEBIAN/postinst
-chmod 755 DEBIAN/postinst
-
-buildsimplenativepackage 'postinst-error' 'amd64,i386' '0.8.15' 'stable' '' 'pkg with posinst error' '' '' './DEBIAN' 
-
-setupaptarchive 
-
-exec 3> apt-progress.log
-testfailure aptget install postinst-error -y -o APT::Status-Fd=3
-msgtest "Ensure correct error message for postinst error"
-grep -q "pmerror:postinst-error :80:subprocess installed post-installation script returned error exit status 2" apt-progress.log && msgpass || msgfail
-

test/integration/test-failing-maintainer-scripts

@@ -0,0 +1,132 @@
+#!/bin/sh
+set -e
+
+TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+
+setupenvironment
+configarchitecture 'native'
+
+# create a bunch of failures
+createfailure() {
+	setupsimplenativepackage "failure-$1" 'native' '1.0' 'unstable' 'Depends: dependee'
+	BUILDDIR="incoming/failure-$1-1.0"
+	echo '#!/bin/sh
+exit 29' > ${BUILDDIR}/debian/$1
+	buildpackage "$BUILDDIR" 'unstable' 'main' 'native'
+	rm -rf "$BUILDDIR"
+}
+
+buildsimplenativepackage 'dependee' 'native' '1.0' 'unstable'
+createfailure 'preinst'
+createfailure 'postinst'
+createfailure 'prerm'
+createfailure 'postrm'
+
+setupaptarchive
+
+# create a library to noop chroot() and rewrite maintainer script executions
+# via execvp() as used by dpkg as we don't want our rootdir to be a fullblown
+# chroot directory dpkg could chroot into to execute the maintainer scripts
+cat << EOF > noopchroot.c
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+static char * chrootdir = NULL;
+
+int chroot(const char *path) {
+	printf("WARNING: CHROOTing to %s was ignored!\n", path);
+	free(chrootdir);
+	chrootdir = strdup(path);
+	return 0;
+}
+int execvp(const char *file, char *const argv[]) {
+	static int (*func_execvp) (const char *, char * const []) = NULL;
+	if (func_execvp == NULL)
+		func_execvp = (int (*) (const char *, char * const [])) dlsym(RTLD_NEXT, "execvp");
+	if (chrootdir == NULL || strncmp(file, "/var/lib/dpkg/", strlen("/var/lib/dpkg/")) != 0)
+		return func_execvp(file, argv);
+	printf("REWRITE execvp call %s into %s\n", file, chrootdir);
+	char newfile[strlen(chrootdir) + strlen(file)];
+	strcpy(newfile, chrootdir);
+	strcat(newfile, file);
+	return func_execvp(newfile, argv);
+}
+EOF
+testsuccess gcc -fPIC -shared -o noopchroot.so noopchroot.c -ldl
+
+mkdir -p "${TMPWORKINGDIRECTORY}/rootdir/usr/bin/"
+DPKG="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/dpkg"
+echo "#!/bin/sh
+if [ -n \"\$LD_PRELOAD\" ]; then
+	export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so \${LD_PRELOAD}\"
+else
+	export LD_PRELOAD=\"${TMPWORKINGDIRECTORY}/noopchroot.so\"
+fi
+dpkg \"\$@\"" > $DPKG
+chmod +x $DPKG
+sed -ie "s|^DPKG::options:: \"dpkg\";\$|DPKG::options:: \"$DPKG\";|" aptconfig.conf
+
+# setup some pre- and post- invokes to check the output isn't garbled later
+APTHOOK="${TMPWORKINGDIRECTORY}/rootdir/usr/bin/apthook"
+echo '#!/bin/sh
+echo "$1: START"
+echo "$1: MaiN"
+echo "$1: ENd"' > $APTHOOK
+chmod +x $APTHOOK
+echo "DPKG::Pre-Invoke:: \"${APTHOOK} PRE\";
+DPKG::Post-Invoke:: \"${APTHOOK} POST\";" > rootdir/etc/apt/apt.conf.d/99apthooks
+
+testmyfailure() {
+	local PROGRESS='rootdir/tmp/progress.log'
+	exec 3> $PROGRESS
+	testfailure "$@" -o APT::Status-Fd=3
+	msgtest 'Test for failure message of maintainerscript in' 'console log'
+	local TEST='rootdir/tmp/testfailure.output'
+	if grep -q 'exit status 29$' "$TEST"; then
+		msgpass
+	else
+		cat $TEST
+		msgfail
+	fi
+	msgtest 'Test for proper execution of invoke scripts in' 'console log'
+	if grep -q '^PRE: START$' $TEST &&
+		grep -q '^PRE: MaiN$' $TEST &&
+		grep -q '^PRE: ENd$' $TEST &&
+		grep -q '^POST: START$' $TEST &&
+		grep -q '^POST: MaiN$' $TEST &&
+		grep -q '^POST: ENd$' $TEST; then
+		msgpass
+	else
+		cat $TEST
+		msgfail
+	fi
+	msgtest 'Test for failure message of maintainerscript in' 'progress log'
+	if grep -q '^pmerror:.\+exit status 29$' "$PROGRESS"; then
+		msgpass
+	else
+		cat $PROGRESS
+		msgfail
+	fi
+	testmarkedauto 'dependee'
+}
+
+cp -a rootdir/var/lib/dpkg/status rootdir/var/lib/dpkg/status.backup
+testmyfailure aptget install failure-preinst -y
+cp -a rootdir/var/lib/dpkg/status.backup rootdir/var/lib/dpkg/status
+testmyfailure aptget install failure-postinst -y
+cp -a rootdir/var/lib/dpkg/status.backup rootdir/var/lib/dpkg/status
+testsuccess aptget install failure-prerm -y
+testdpkginstalled failure-prerm
+testmyfailure aptget purge failure-prerm -y
+cp -a rootdir/var/lib/dpkg/status.backup rootdir/var/lib/dpkg/status
+testsuccess aptget install failure-postrm -y
+testdpkginstalled failure-postrm
+testmyfailure aptget purge failure-postrm -y
+
+# FIXME: test with output going to a PTY as it usually does
+#cp -a rootdir/var/lib/dpkg/status.backup rootdir/var/lib/dpkg/status
+#aptget install failure-preinst -y