support/dependencies, scripts: accept patches with renames

Currently, patches with renames are refused, as they reqire patch 2.7
or newer. So far, we did not require that version because it was too
recent to be widely available.

But patch 2.7 has been released in 2012, almost 9 years ago now; it is
old enough that we can start relying on it.

Add a check that patch is GNU patch 2.7 or newer, and so drop the common
check for patch, and drop the check about renames in apply-patches.sh.

Signed-off-by: Ryota Kinukawa <pojiro.jp@gmail.com>
[yann.morin.1998@free.fr:
  - drop common check
  - shorten variable names
  - drop now-incorrect comment about busybox w/desktop
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/dependencies/dependencies.sh

@@ -163,7 +163,7 @@ fi
 
 # Check that a few mandatory programs are installed
 missing_progs="no"
-for prog in patch perl tar wget cpio unzip rsync bc ${DL_TOOLS} ; do
+for prog in perl tar wget cpio unzip rsync bc ${DL_TOOLS} ; do
 	if ! which $prog > /dev/null ; then
 		echo "You must install '$prog' on your build machine";
 		missing_progs="yes"
@@ -183,11 +183,19 @@ if test "${missing_progs}" = "yes" ; then
 	exit 1
 fi
 
-# apply-patches.sh needs patch with --no-backup-if-mismatch support (GNU, busybox w/DESKTOP)
-if ! patch --no-backup-if-mismatch </dev/null 2>/dev/null; then
-	echo "Your patch program does not support the --no-backup-if-mismatch option. Install GNU patch"
+PATCH_VERSION="$(patch -v 2>/dev/null | sed -n 's/^GNU patch \(.*\)/\1/p')"
+if [ -z "${PATCH_VERSION}" ] ; then
+	echo
+	echo "You must install GNU patch"
 	exit 1
 fi
+PATCH_MAJOR="$(echo "${PATCH_VERSION}" | cut -d . -f 1)"
+PATCH_MINOR="$(echo "${PATCH_VERSION}" | cut -d . -f 2)"
+if [ "${PATCH_MAJOR}" -lt 2 ] || [ "${PATCH_MAJOR}" -eq 2 -a "${PATCH_MINOR}" -lt 7 ] ; then
+	echo
+	echo "You have GNU patch '${PATCH_VERSION}' installed.  GNU patch >= 2.7 is required"
+	exit 1;
+fi
 
 if grep ^BR2_NEEDS_HOST_UTF8_LOCALE=y $BR2_CONFIG > /dev/null; then
 	if ! which locale > /dev/null ; then

support/scripts/apply-patches.sh

@@ -113,11 +113,6 @@ function apply_patch {
         echo "  to be applied  : ${path}/${patch}"
         exit 1
     fi
-    if ${uncomp} "${path}/$patch" | grep -q "^rename from" && \
-       ${uncomp} "${path}/$patch" | grep -q "^rename to" ; then
-        echo "Error: patch contains some renames, not supported by old patch versions"
-        exit 1
-    fi
     echo "${path}/${patch}" >> ${builddir}/.applied_patches_list
     ${uncomp} "${path}/$patch" | patch -g0 -p1 -E --no-backup-if-mismatch -d "${builddir}" -t -N $silent
     if [ $? != 0 ] ; then