Revert "Use /etc/os-release as alternative when lsb_release is not available"

This reverts commit 49fb41c.

Author: vmcj

misc-tools/dj_make_chroot.in

@@ -23,36 +23,6 @@ cleanup() {
 }
 trap cleanup EXIT
 
-if command -v lsb_release; then
-    get_host () {
-        lsb_release -i -s
-    }
-    get_codename () {
-        lsb_release -c -s
-    }
-    get_release () {
-        lsb_release -r -s
-    }
-elif -f /etc/os-release; then
-    sel_grep () {
-        # Discard everything up to \K and make sure line ends with '"'.
-        grep -oP '^${1}="\K.*(?=")' /etc/os_release
-    }
-    get_host () {
-        sel_grep "NAME"
-    }
-    get_codename () {
-        sel_gep "VERSION_CODENAME"
-    }
-    get_release () {
-        echo "Please install `lsb_release`."
-        exit 1
-    }
-else
-    echo "Please install `lsb_release`."
-    exit 1
-fi
-
 # Default directory where to build the chroot tree:
 CHROOTDIR="@judgehost_chrootdir@"
 
@@ -65,14 +35,15 @@ DEBIAN_ARCHLIST="amd64,arm64,armel,armhf,i386,mips,mips64el,mipsel,ppc64el,s390x
 UBUNTU_ARCHLIST="amd64,arm64,armhf,i386,powerpc,ppc64el,s390x"
 
 # If host system is Debian or Ubuntu, use its release and architecture by default
-if [ "$(get_host)" = 'Debian' ] || [ "$(get_host)" = 'Ubuntu' ]; then
-    DISTRO="$(get_host)"
-    RELEASE="$(get_codename)"
-    if [ "$(get_host)" = 'Debian' ]; then
-        if [ "$(get_codename)" = "sid" ]; then
+if [ "$(lsb_release -i -s || true)" = 'Debian' ] || \
+   [ "$(lsb_release -i -s || true)" = 'Ubuntu' ]; then
+    DISTRO="$(lsb_release -i -s)"
+    RELEASE="$(lsb_release -c -s)"
+    if [ "$(lsb_release -i -s)" = 'Debian' ]; then
+        if [ "$(lsb_release -c -s)" = "sid" ]; then
             RELEASE='unstable'
         fi
-        if [ "$(get_release)" = 'testing' ]; then
+        if [ "$(lsb_release -r -s)" = 'testing' ]; then
             RELEASE='testing'
         fi
     fi