Add string replacement for dir_install

astronaut/astronaut

@@ -6,6 +6,10 @@
 dir_build="/tmp/astronaut/build"  # Temporary directory to build packages
 dir_source="/tmp/astronaut/source"  # Directory where the package sources will be placed
 dir_install="/tmp/astronaut/install"  # Directory where the package will be installed
+# The source directory will have subdirs for each different $name,
+#   specified inside the satellite file.
+# The $dir_install variable will have '{pkg}' replaced with $_satname,
+#   which is the filename of the satellite, without the .sat suffix.
 
 # Runtime directories
 dir_sysroot="/"  # The root directory of the system
@@ -42,6 +46,11 @@ vcs_compile=false
 unset _user_options  # Options specified in the command line get the highest priority
 #_nuke_dir_install (This can be set from wrappers)
 
+# Should be specified in the satellite
+unset name
+unset version
+unset update_url
+
 # Some printing functions
 _show_help() {
 echo "This astronaut will help you build some satellites.
@@ -60,7 +69,7 @@ Usage: $0 [-sbipr <dir>] [-Id] [-o <options>] <satellite>
 -o   Set package options (comma-separated)
 
 Tips:
-- Use \`head -n 32 $0 > astronaut.conf.example\` to generate a default configuration file.
+- Use \`head -n 36 $0 > astronaut.conf.example\` to generate a default configuration file.
 - Keep in mind that when specifying options on the command line in a string, the first always takes priority.
     For example, in \"opt,someotheropt,!opt\", opt is enabled, due to it being the first occurrence.
 - If you have set \$dir_satellites in the config, you can omit the .sat suffix.
@@ -126,6 +135,10 @@ _mksum() {
     echo "$(md5sum "$@" 2> /dev/null | cut -d' ' -f1)"
 }
 
+_safe_sed() {
+    echo "$1" | sed 's/[[\.*^$/]/\\&/g'
+}
+
 download() {
     mkdir -p "$dir_source/$name"
 
@@ -138,7 +151,7 @@ download() {
         _msg "Downloading $filename"
 
         [ "$3" ] && local cmd="$3" || local cmd="$cmd_download"
-        eval $(echo "$cmd" | sed -e "s@{dst}@'$path'@g" -e "s@{src}@'$1'@g")
+        eval $(echo "$cmd" | sed -e "s@{dst}@'$(_safe_sed "$path")'@g" -e "s@{src}@'$(_safe_sed "$1")'@g")
 
         checksum="$(_mksum "$path")"
         if [ "$2" -a "$checksum" != "$2" ]; then
@@ -287,6 +300,9 @@ mkdir -p "$dir_source"
 dir_source="$(realpath "$dir_source")"
 
 if [ "$_download_only" = false ]; then
+    # Fix up the install path
+    dir_install="$(echo "$dir_install" | sed -e "s@{pkg}@$(_safe_sed "$satname")@g")"
+
     # This variable can be set by a wrapper script in need to nuke the install dir.
     if [ "$_nuke_dir_install" = true -a ! -z "$dir_install" ]; then
         rm -rf "$dir_install"