[PATCH] configure: Add 'mkdir build' check

[Dinah Baum <dinahbaum123@gmail.com>]

QEMU configure script goes into an infinite error printing loop
when in read only directory due to 'build' dir never being created.

Checking if 'mkdir dir' succeeds and if the directory is
writeable prevents this error.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/321

Signed-off-by: Dinah Baum <dinahbaum123@gmail.com>
---
 configure | 37 ++++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/configure b/configure
index 64960c6000..fe9028991f 100755
--- a/configure
+++ b/configure
@@ -32,9 +32,11 @@ then
     fi
 
     mkdir build
-    touch $MARKER
+    if [ -d build ] && [ -w build ]
+    then
+        touch $MARKER
 
-    cat > GNUmakefile <<'EOF'
+        cat > GNUmakefile <<'EOF'
 # This file is auto-generated by configure to support in-source tree
 # 'make' command invocation
 
@@ -56,8 +58,15 @@ force: ;
 GNUmakefile: ;
 
 EOF
-    cd build
-    exec "$source_path/configure" "$@"
+        cd build
+        exec "$source_path/configure" "$@"
+    elif ! [ -d build ]
+    then
+        echo "ERROR: Unable to create ./build dir, try using a ../qemu/configure build"
+    elif ! [ -w build ]
+    then
+        echo "ERROR: ./build dir not writeable, try using a ../qemu/configure build"
+    fi
 fi
 
 # Temporary directory used for files created while
@@ -181,9 +190,12 @@ compile_prog() {
 
 # symbolically link $1 to $2.  Portable version of "ln -sf".
 symlink() {
-  rm -rf "$2"
-  mkdir -p "$(dirname "$2")"
-  ln -s "$1" "$2"
+  if [ -d $source_path/build ] && [ -w $source_path/build ]
+  then
+      rm -rf "$2"
+      mkdir -p "$(dirname "$2")"
+      ln -s "$1" "$2"
+  fi
 }
 
 # check whether a command is available to this shell (may be either an
@@ -2287,7 +2299,18 @@ fi
 #######################################
 # generate config-host.mak
 
+if ! [ -d $source_path/build ] || ! [ -w $source_path/build ]
+then
+    echo "ERROR: ./build dir unusable, exiting"
+    # cleanup
+    rm -f config.log
+    rm -f Makefile.prereqs
+    rm -r "$TMPDIR1"
+    exit 1
+fi
+
 if ! (GIT="$git" "$source_path/scripts/git-submodule.sh" "$git_submodules_action" "$git_submodules"); then
+    echo "BAD"
     exit 1
 fi
 
-- 
2.30.2