rework fixenv-nonstd-libdir script

the script won't create another file (run-nonroot previously)
and instead carry out environment setup itself for the binary
links pointing at it - it's more readable and smaller this way

rework mips32r2.py file copy def - may be useful in other files,
eventually transport this functionality to base.py (!?) later
on, after this branch is merged to master

kiwixbuild/patches/fixenv-nonstd-libdir

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+BASENAME=`basename $0`
+SCRIPT=`realpath $0`
+SCRIPTPATH=`dirname $SCRIPT`
+
+if ! test -L "$0"
+then
+  cd "$SCRIPTPATH" && find -type f | grep -v ".real$" | \
+  while read b
+  do
+    if hexdump -C "$b" | head -1 | grep -q ELF
+    then
+      mv -iv "$b" "$b.real"
+      ln -s "$BASENAME" "$b"
+    fi
+  done
+else
+  for fullarch in "" mips-linux-uclibc
+  do for libdir in usr/lib lib
+     do LD_LIBRARY_PATH="${SCRIPTPATH%/bin}/$libdir/$fullarch:$LD_LIBRARY_PATH"
+     done
+  done
+
+  export LD_LIBRARY_PATH
+  exec ${SCRIPTPATH}/$BASENAME.real "$@"
+fi

kiwixbuild/patches/fixenv-nonstd-libdir.sh

@@ -1,39 +0,0 @@
-#!/bin/sh
-
-if ! test -f kiwix-serve
-then
-  echo Needs to run in the same directory that hosts kiwix-serve binary.
-  exit 1
-fi
-
-find -type f | \
-while read
-do
-  if hexdump -C $REPLY | head -1 | grep -q ELF
-  then
-    mv -iv "$REPLY" "$REPLY.real"
-    ln -s run-nonroot "$REPLY"
-  fi
-done
-
-cat <<'EOF' > run-nonroot
-#!/bin/sh
-
-BASENAME=`basename $0`
-SCRIPT=`realpath $0`
-SCRIPTPATH=`dirname $SCRIPT`
-
-if test x"$BASENAME" != xrun-nonroot
-then
-  for fullarch in "" ${ARCH_FULL:-mips-linux-gnu}
-  do for libdir in usr/lib lib
-     do LD_LIBRARY_PATH="${SCRIPTPATH%/bin}/$libdir/$fullarch:$LD_LIBRARY_PATH"
-     done
-  done
-
-  export LD_LIBRARY_PATH
-  exec ${SCRIPTPATH}/$BASENAME.real "$@"
-fi
-EOF
-
-chmod +x run-nonroot

kiwixbuild/platforms/mips32r2.py

@@ -2,19 +2,28 @@ from .base import PlatformInfo, _SCRIPT_DIR
 
 from kiwixbuild.utils import pj
 from kiwixbuild._global import get_target_step
-from re import sub as sed
 
 from glob import glob
 from os import makedirs, chmod, readlink, symlink
 from os.path import basename, islink
+from re import sub as subst
 from shutil import copy2
 
-def copy(src, dst):
+def copy(src, dst, search=None, repl=None, mode=None):
     if islink(src):
         linkto = readlink(src)
         symlink(linkto, dst)
     else:
-        copy2(src,dst)
+        if search is None:
+            copy2(src, dst)
+        else:
+            with open(src, "r") as sources:
+                lines = sources.readlines()
+            with open(dst, "w") as sources:
+                for line in lines:
+                    sources.write(subst(search, repl, line))
+    if mode is not None:
+        chmod(dst, mode)
 
 
 class MIPS32R2PlatformInfo(PlatformInfo):
@@ -115,7 +124,7 @@ class MIPS32R2Static(MIPS32R2PlatformInfo):
 
 
 class MIPS32R2_UC_GCXXPlatformInfo(MIPS32R2PlatformInfo):
-    build = 'mips32r2_uclibc_gclibcxx' # "shared, heterogeneous"
+    build = 'mips32r2_uclibc_glibcxx' # "shared, heterogeneous"
     arch_full = 'mips-linux-uclibc'
 
     @property
@@ -140,12 +149,11 @@ class MIPS32R2_UC_GCXXDyn(MIPS32R2_UC_GCXXPlatformInfo):
         d = pj(_SCRIPT_DIR, '..', '..', 'BUILD_'+self.name, 'INSTALL')
 
         makedirs(pj(d, 'bin'), mode=0o755, exist_ok=True)
-        with open(pj(_SCRIPT_DIR, '..', 'patches', 'fixenv-nonstd-libdir.sh'), "r") as sources:
-            lines = sources.readlines()
-        with open(pj(d, 'bin', 'fixenv-nonstd-libdir'), "w") as sources:
-            for line in lines:
-                sources.write(sed(r'\$\{ARCH_FULL[^}]*\}', self.arch_full, line))
-        chmod(pj(d, 'bin', 'fixenv-nonstd-libdir'), 0o755)
+        copy(pj(_SCRIPT_DIR, '..', 'patches', 'fixenv-nonstd-libdir'),
+             pj(d, 'bin', 'fixenv-nonstd-libdir'),
+             search=r'\$\{ARCH_FULL[^}]*\}',
+             repl=self.arch_full,
+             mode=0o755)
 
         d = pj(d, 'lib', self.arch_full)
         makedirs(d, mode=0o755, exist_ok=True)