common/libexec: remove redundant pre/do/post preparation code

This pullrequest removes redundant codepaths in
xbps-src-do{build,configure,install}.sh and joins the code in the
run_step function. This causes slightly different behavior to
do_install:
Do install will chdir to wrksrc only _before_ the first step. The
current behavior is that pre_install will run without a chdir, do_ and
post_ is runned with a chdir. This is a subtle but breaking change and
may cause some templates to break at install phase.

common/xbps-src/libexec/xbps-src-dobuild.sh

@@ -31,41 +31,7 @@ for f in $XBPS_COMMONDIR/environment/build/*.sh; do
     source_file "$f"
 done
 
-cd "$wrksrc" || msg_error "$pkgver: cannot access wrksrc directory [$wrksrc]\n"
+run_step build
-if [ -n "$build_wrksrc" ]; then
-    cd $build_wrksrc || \
-        msg_error "$pkgver: cannot access build_wrksrc directory [$build_wrksrc]\n"
-fi
-
-run_pkg_hooks pre-build
-
-# Run pre_build()
-if declare -f pre_build >/dev/null; then
-    run_func pre_build
-fi
-
-# Run do_build()
-if declare -f do_build >/dev/null; then
-    run_func do_build
-else
-    if [ -n "$build_style" ]; then
-        if [ ! -r $XBPS_BUILDSTYLEDIR/${build_style}.sh ]; then
-            msg_error "$pkgver: cannot find build helper $XBPS_BUILDSTYLEDIR/${build_style}.sh!\n"
-        fi
-        . $XBPS_BUILDSTYLEDIR/${build_style}.sh
-        if declare -f do_build >/dev/null; then
-            run_func do_build
-        fi
-    fi
-fi
-
-
-# Run post_build()
-if declare -f post_build >/dev/null; then
-    run_func post_build
-fi
-
-run_pkg_hooks post-build
 
 touch -f $XBPS_BUILD_DONE
 

common/xbps-src/libexec/xbps-src-doconfigure.sh

@@ -31,40 +31,7 @@ for f in $XBPS_COMMONDIR/environment/configure/*.sh; do
     source_file "$f"
 done
 
-cd "$wrksrc" || msg_error "$pkgver: cannot access wrksrc directory [$wrksrc].\n"
+run_step configure optional
-if [ -n "$build_wrksrc" ]; then
-    cd $build_wrksrc || \
-        msg_error "$pkgver: cannot access build_wrksrc directory [$build_wrksrc].\n"
-fi
-
-run_pkg_hooks pre-configure
-
-# Run pre_configure()
-if declare -f pre_configure >/dev/null; then
-    run_func pre_configure
-fi
-
-# Run do_configure()
-if declare -f do_configure >/dev/null; then
-    run_func do_configure
-else
-    if [ -n "$build_style" ]; then
-        if [ ! -r $XBPS_BUILDSTYLEDIR/${build_style}.sh ]; then
-            msg_error "$pkgver: cannot find build helper $XBPS_BUILDSTYLEDIR/${build_style}.sh!\n"
-        fi
-        . $XBPS_BUILDSTYLEDIR/${build_style}.sh
-        if declare -f do_configure >/dev/null; then
-            run_func do_configure
-        fi
-    fi
-fi
-
-# Run post_configure()
-if declare -f post_configure >/dev/null; then
-    run_func post_configure
-fi
-
-run_pkg_hooks post-configure
 
 touch -f $XBPS_CONFIGURE_DONE
 

common/xbps-src/libexec/xbps-src-doinstall.sh

@@ -37,32 +37,7 @@ if [ "$SUBPKG_MODE"  = "no" ]; then
     if [ ! -f $XBPS_INSTALL_DONE ] || [ -f $XBPS_INSTALL_DONE -a -n "$XBPS_BUILD_FORCEMODE" ]; then
         mkdir -p $XBPS_DESTDIR/$XBPS_CROSS_TRIPLET/$pkgname-$version
 
-        # Run pre-install hooks
+        run_step install "" skip
-        run_pkg_hooks pre-install
-
-        # Run pre_install()
-        if declare -f pre_install >/dev/null; then
-            run_func pre_install
-        fi
-
-        # Run do_install()
-        cd "$wrksrc"
-        [ -n "$build_wrksrc" ] && cd $build_wrksrc
-        if declare -f do_install >/dev/null; then
-            run_func do_install
-        else
-            if [ ! -r $XBPS_BUILDSTYLEDIR/${build_style}.sh ]; then
-                msg_error "$pkgver: cannot find build helper $XBPS_BUILDSTYLEDIR/${build_style}.sh!\n"
-            fi
-            . $XBPS_BUILDSTYLEDIR/${build_style}.sh
-            run_func do_install
-        fi
-        # Run post_install()
-        cd "$wrksrc"
-        [ -n "$build_wrksrc" ] && cd $build_wrksrc
-        if declare -f post_install >/dev/null; then
-            run_func post_install
-        fi
 
         touch -f $XBPS_INSTALL_DONE
     fi

common/xbps-src/shutils/common.sh

@@ -27,6 +27,54 @@ run_func() {
     set +E
 }
 
+ch_wrksrc() {
+  cd "$wrksrc" || msg_error "$pkgver: cannot access wrksrc directory [$wrksrc]\n"
+  if [ -n "$build_wrksrc" ]; then
+    cd $build_wrksrc || \
+        msg_error "$pkgver: cannot access build_wrksrc directory [$build_wrksrc]\n"
+  fi
+}
+
+# runs {pre,do,post}_X tripplets
+run_step() {
+  local step_name="$1" optional_step="$2" skip_post_hook="$3"
+
+  run_pkg_hooks "pre-$step_name"
+
+  ch_wrksrc
+  # Run pre_* Phase
+  if declare -f "pre_$step_name" >/dev/null; then
+    run_func "pre_$step_name"
+  fi
+
+  # Run do_* Phase
+  if declare -f "do_$step_name" >/dev/null; then
+    run_func "do_$step_name"
+  elif [ -n "$build_style" ]; then
+    if [ -r $XBPS_BUILDSTYLEDIR/${build_style}.sh ]; then
+      . $XBPS_BUILDSTYLEDIR/${build_style}.sh
+      if declare -f "do_$step_name" >/dev/null; then
+        run_func "do_$step_name"
+      elif [ ! "$optional_step" ]; then
+        msg_error "$pkgver: cannot find do_$step_name() in $XBPS_BUILDSTYLEDIR/${build_style}.sh!\n"
+      fi
+    else
+      msg_error "$pkgver: cannot find build helper $XBPS_BUILDSTYLEDIR/${build_style}.sh!\n"
+    fi
+  elif [ ! "$optional_step" ]; then
+    msg_error "$pkgver: cannot find do_$step_name()!\n"
+  fi
+
+  # Run post_* Phase
+  if declare -f "post_$step_name" >/dev/null; then
+    run_func "post_$step_name"
+  fi
+
+  if ! [ "$skip_post_hook" ]; then
+    run_pkg_hooks "post-$step_name"
+  fi
+}
+
 error_func() {
     if [ -n "$1" -a -n "$2" ]; then
         msg_red "$pkgver: failed to run $1() at line $2.\n"