Load setup files instead of sourcing them

- needed for same setup files to work on Windows
  (where PowerShell is used instead of bash)
- removes ugly bashism to allow overriding from .travis.yml
- adds a proper (yet small) syntax
Also adds tests for the new syntax and updates the README.

README.md

@@ -71,15 +71,15 @@ example.
 
     E.g., a setup file `stable.set` specifying
     ```
-    MODULES="sncseq asyn"
+    MODULES=sncseq asyn
 
-    BASE=${BASE:-R3.15.6}
-    ASYN=${ASYN:-R4-34}
-    SNCSEQ=${SNCSEQ:-R2-2-7}
+    BASE=R3.15.6
+    ASYN=R4-34
+    SNCSEQ=R2-2-7
     ```
     will compile against the EPICS Base release 3.15.6, the Sequencer
     release 2.2.7 and release 4.34 of asyn.
-    (The `${VAR:-default}` form allows overriding from `.travis.yml`.)
+    (Any settings can be overridden from `.travis.yml`.)
 
  4. Create a configuration for the CI service by copying one of
     the examples provided in the service specific subdirectory
@@ -106,14 +106,19 @@ latest released versions and one for the development branches.
 
 ## Setup File Syntax
 
-Setup files are sourced by the bash scripts. They are found by searching
+Setup files are loaded by the bash scripts. They are found by searching
 the locations in `SETUP_PATH` (space or colon separated list of directories,
 relative to your module's root directory).
 
-Setup files can include other setup files by calling `source_set <setup>`
+Setup files can include other setup files by calling `include <setup>`
 (omitting the `.set` extension of the setup file). The configured
 `SETUP_PATH` is searched for the include.
 
+Any `VAR=value` setting of a variable is only executed if `VAR` is unset or
+empty. That way any settings can be overridden by settings in `.travis.yml`.
+
+Empty lines or lines starting with `#` are ignored.
+
 `MODULES="<list of names>"` should list the dependencies (software modules)
 by using their well-known slugs, separated by spaces.
 EPICS Base (slug: `base`) will always be a dependency and will be added and
@@ -132,8 +137,6 @@ be a *tag* name (in that case the module is checked out into Travis' cache
 system) or a *branch* name (in that case the module is always checked out
 and recompiled as part of the job). [default: `master`]
 
-(Use the `${VAR:-default}` form to allow overriding from `.travis.yml`.)
-
 `FOO_REPONAME=<name>` Set the name of the remote repository as `<name>.git`.
 [default is the slug in lower case: `foo`]
 

test00.set

@@ -1,3 +1,3 @@
-MODULES=""
+MODULES=
 
-BASE=${BASE:-R3.15.6}
+BASE=R3.15.6

test01.set

@@ -1,4 +1,4 @@
 MODULES="sncseq"
 
-BASE=${BASE:-7.0}
-SNCSEQ=${SNCSEQ:-R2-2-7}
+BASE=7.0
+SNCSEQ=R2-2-7

test02.set

@@ -0,0 +1,10 @@
+# a comment, then an empty line
+
+  # a comment that is indented
+BASE=foo
+# include an existing file
+include test01
+
+FOO=bar
+FOO2=bar bar2
+  FOO3=bar bar2

test03.set

@@ -0,0 +1,4 @@
+# Check for avoiding multiple includions
+
+include test01
+include test01

travis-test.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 # Module ci-scripts unit tests
 
@@ -62,9 +62,20 @@ fn_exists add_dependency || die "function add_dependency missing from SCRIPTDIR/
 SETUP_DIRS= source_set test01 | grep -q "(SETUP_PATH) is empty" || die "empty search path not detected"
 source_set xxdoesnotexistxx | grep -q "does not exist" || die "missing setup file not detected"
 source_set test01 | grep -q "Loading setup file" || die "test01 setup file not found"
-BASE=foo
+unset SEEN_SETUPS
+export BASE=foo
 source_set test01
-[ "$BASE" = "foo" ] || die "preset module (BASE) version does not override test01 setup file"
+[ "$BASE" = "foo" ] || die "preset module BASE version does not override test01 setup file (expected foo got $BASE)"
+unset SEEN_SETUPS
+BASE=
+source_set test02
+[ "$BASE" = "foo" ] || die "BASE set in test02 does not override included test01 setup file (expected foo got $BASE)"
+[ "$FOO" = "bar" ] || die "Setting of single word does not work"
+[ "$FOO2" = "bar bar2" ] || die "Setting of multiple words does not work"
+[ "$FOO3" = "bar bar2" ] || die "Indented setting of multiple words does not work"
+[ "$SNCSEQ" = "R2-2-7" ] || die "Setup test01 was not included"
+unset SEEN_SETUPS
+source_set test03 | grep -q "Ignoring already included setup file" || die "test01 setup file included twice"
 
 # test default settings file
 ######################################################################

travis/build.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 # Set VV in .travis.yml to make scripts verbose

travis/prepare.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 # Set VV in .travis.yml to make scripts verbose

travis/utils.sh

@@ -33,8 +33,9 @@ fold_end() {
 #
 # Source a settings file (extension .set) found in the SETUP_DIRS path
 # May be called recursively (from within a settings file)
+declare -a SEEN_SETUPS
 source_set() {
-  local set_file=$1
+  local set_file=${1//[$'\r']}
   local set_dir
   local found=0
   if [ -z "${SETUP_DIRS}" ]
@@ -46,8 +47,30 @@ source_set() {
   do
     if [ -e $set_dir/$set_file.set ]
     then
+      if [[ " ${SEEN_SETUPS[@]} " =~ " $set_dir/$set_file.set " ]]
+      then
+        echo "Ignoring already included setup file $set_dir/$set_file.set"
+        return
+      fi
+      SEEN_SETUPS+=($set_dir/$set_file.set)
       echo "Loading setup file $set_dir/$set_file.set"
-      . $set_dir/$set_file.set
+      local line
+      while read -r line
+      do
+        [ -z "$line" ] && continue
+        echo $line | grep -q "^#" && continue
+        if echo $line | grep -q "^include\W"
+        then
+          source_set $(echo $line | awk '{ print $2 }')
+          continue
+        fi
+        if echo "$line" | grep -q "^\w\+="
+        then
+          IFS== read var value <<< "${line//[$'\r']}"
+          value=$(sed "s/^\(\"\)\(.*\)\1\$/\2/g" <<< "$value") # remove surrounding quotes
+          eval [ "\${$var}" ] || eval "$var=\$value"
+        fi
+      done < $set_dir/$set_file.set
       found=1
       break
     fi