genfiles.sh helper script

Recursively converts template files from <src tree> to real files in <dest tree>
(using "query-config --from-file ... --outfile ...").

3 files changed, 115 insertions, 0 deletions

diff --git a/bin/genfiles.bash b/bin/genfiles.bash
new file mode 120000
index 0000000..9c90d9e
--- /dev/null
+++ b/bin/genfiles.bash
@@ -0,0 +1 @@
+invoke_script.bash
\ No newline at end of file
diff --git a/bin/invoke_script.bash b/bin/invoke_script.bash
new file mode 100755
index 0000000..4a5b4dc
--- /dev/null
+++ b/bin/invoke_script.bash
@@ -0,0 +1,21 @@
+#!/bin/bash
+readonly SCRIPT="$(readlink -f "${BASH_SOURCE[0]?}")"
+readonly SCRIPT_NAME="${BASH_SOURCE[0]##*/}"
+readonly SCRIPT_DIR="${SCRIPT%/*}"
+
+readonly PRJROOT="${SCRIPT_DIR%/*}"
+readonly REAL_SCRIPT="${SCRIPT_DIR}/scripts/${SCRIPT_NAME%.*}.sh"
+
+export ROVERLAY_PRJROOT="${PRJROOT}"
+export X_RV_QUERY_CONFIG="${PRJROOT}/bin/query_config"
+
+cd "${PRJROOT}" || exit
+
+if [[ -x "${REAL_SCRIPT}" ]]; then
+   exec ${REAL_SCRIPT} "$@"
+elif [[ -f "${REAL_SCRIPT}" ]]; then
+   exec ${SHELL:-sh} ${REAL_SCRIPT} "$@"
+else
+   echo "script not found: ${REAL_SCRIPT}" 1>&2
+   exit 9
+fi
diff --git a/bin/scripts/genfiles.sh b/bin/scripts/genfiles.sh
new file mode 100755
index 0000000..61ee3ab
--- /dev/null
+++ b/bin/scripts/genfiles.sh
@@ -0,0 +1,93 @@
+#!/bin/sh -u
+# Usage: genfiles.sh <src tree> <dest tree> [query-config args...]
+#
+#  Converts template files from <src tree> to real files in <dest tree>.
+#
+
+# die ( [message], [exit_code] ), raises exit()
+die()           { echo "${1:+died: }${1:-died.}" 1>&2; exit ${2:-2}; }
+autodie()       { "$@" || die "command '$*' returned ${?}." ${?}; }
+OUT_OF_BOUNDS() { die "shift returned non-zero."; }
+dodir()         { [ -d "${1-}" ] || mkdir -p -- "${1}"; }
+
+
+# genfile ( infile, destdir_relpath, *query_config_args )
+#
+genfile() {
+   local infile destdir destfile fname
+
+   infile="${1}"
+   [ -n "${2}" ] && destdir="${DEST_TREE%/}/${2}" || destdir="${DEST_TREE}"
+   fname="${1##*/}"; fname="${fname%.in}"
+   destfile="${destdir%/}/${fname}"
+
+   shift 2 || OUT_OF_BOUNDS
+
+   if [ "${infile}" = "${destfile}" ]; then
+      die "infile = outfile: ${infile}"
+   else
+      autodie dodir "${destdir}"
+      echo "creating ${destfile}"
+      if ${X_RV_QUERY_CONFIG} "$@" -f "${infile}" -O "${destfile}"; then
+         # chmod, ...?
+         true
+      else
+         echo "!!! failed to create '${destfile}' (rc=${?})" 1>&2
+         fail=$(( ${fail?} + 1 ))
+      fi
+   fi
+}
+
+# genfiles_recursive ( root, root_relpath, *query_config_args )
+#
+genfiles_recursive() {
+   local root relpath item
+
+   root="${1}"
+   relpath="${2#/}"
+
+   shift 2 || OUT_OF_BOUNDS
+
+   for item in "${root}/"*; do
+      if [ -d "${item}" ]; then
+         genfiles_recursive "${item}" "${relpath}/${item##*/}" "$@"
+      elif [ -f "${item}" ]; then
+         # converts file symlinks to files
+         genfile "${item}" "${relpath}" "$@"
+      else
+         echo "cannot handle '${item}'" 1>&2
+      fi
+   done
+}
+
+# ---
+
+: ${X_RV_QUERY_CONFIG:=/usr/bin/roverlay-query-config}
+
+case "${1-}" in
+   '-h'|'--help')
+      echo "Usage: genfiles.sh <src tree> <dest tree< [<query-config arg>...]"
+      exit 0
+   ;;
+esac
+
+[ -n "${1-}" ] || die "missing src tree arg."
+[ -n "${2-}" ] || die "missing dest tree arg."
+
+SRC_TREE="$(readlink -f "${1}")"
+DEST_TREE="$(readlink -f "${2}")"
+
+[ -n "${SRC_TREE}" ] && [ -d "${SRC_TREE}" ] || die "src tree does not exist."
+[ -n "${DEST_TREE}" ] || die "invalid dest tree."
+
+shift 2
+
+# globbing is essential, make sure that "noglob" is disabled
+set +f
+fail=0
+genfiles_recursive "${SRC_TREE}" "" "$@"
+if [ ${fail} -gt 0 ]; then
+   exit 3
+else
+   exit 0
+fi