docker build support

steps/improve/finalize_fhs.sh

@@ -16,8 +16,58 @@ mount | grep '/sys' &> /dev/null || (mkdir -p /sys; mount -t sysfs sysfs /sys)
 mount | grep '/tmp' &> /dev/null || (mkdir -p /tmp; mount -t tmpfs tmpfs /tmp)
 mount | grep '/dev/shm' &> /dev/null || (mkdir -p /dev/shm; mount -t tmpfs tmpfs /dev/shm)
 
-if [ "${EXTERNAL_SOURCES}" = "False" ]; then
-    # Add /etc/resolv.conf
+if [ "${CHROOT}" = False ]; then
+    rm /etc/mtab
+    ln -s /proc/mounts /etc/mtab
+fi
+
+# Add /etc/resolv.conf
+if [ ! -e "/etc/resolv.conf" ]; then
     echo 'nameserver 1.1.1.1' > /etc/resolv.conf
+fi
+if [ ! -e "/etc/resolv.conf/head" ]; then
     echo 'nameserver 1.1.1.1' > /etc/resolv.conf.head
 fi
+
+# /etc/passwd -- taken from LFS
+if [ ! -e "/etc/passwd" ]; then
+    cat > /etc/passwd << "EOF"
+root:x:0:0:root:/root:/bin/bash
+bin:x:1:1:bin:/dev/null:/usr/bin/false
+daemon:x:6:6:Daemon User:/dev/null:/usr/bin/false
+messagebus:x:18:18:D-Bus Message Daemon User:/run/dbus:/usr/bin/false
+uuidd:x:80:80:UUID Generation Daemon User:/dev/null:/usr/bin/false
+nobody:x:65534:65534:Unprivileged User:/dev/null:/usr/bin/false
+EOF
+fi
+
+# /etc/group -- taken from LFS
+if [ ! -e "/etc/group" ]; then
+    cat > /etc/group << "EOF"
+root:x:0:
+bin:x:1:daemon
+sys:x:2:
+kmem:x:3:
+tape:x:4:
+tty:x:5:
+daemon:x:6:
+floppy:x:7:
+disk:x:8:
+lp:x:9:
+dialout:x:10:
+audio:x:11:
+video:x:12:
+utmp:x:13:
+usb:x:14:
+cdrom:x:15:
+adm:x:16:
+messagebus:x:18:
+input:x:24:
+mail:x:34:
+kvm:x:61:
+uuidd:x:80:
+wheel:x:97:
+users:x:999:
+nogroup:x:65534:
+EOF
+fi