instaweb: fix WEBrick server support

This has been broken since commit be5347b ("httpd logs in a
"$httpd_only" subdirectory").

Since WEBrick has no other way of preserving environment
variables needed for gitweb, we create a shell script wrapper
that sets the environment variables as our CGI interpreter
to run gitweb.cgi.

Signed-off-by: Eric Wong <normalperson@yhbt.net>

diff --git a/git-instaweb.sh b/git-instaweb.sh
index b7342e22c88993756e7beb6582a896087e52a034..5d4ddc8f583c460a0c9a11d0167e4bd6318c7e56 100755 (executable)
--- a/git-instaweb.sh
+++ b/git-instaweb.sh
@@ -57,6 +57,13 @@ resolve_full_httpd () {
                httpd_only="${httpd%% *}" # cut on first space
                return
                ;;
+       *webrick*)
+               # server is started by running via generated webrick.sh in
+               # $fqgitdir/gitweb
+               full_httpd="$fqgitdir/gitweb/webrick.sh"
+               httpd_only="${httpd%% *}" # cut on first space
+               return
+               ;;
        esac
 
        httpd_only="$(echo $httpd | cut -f1 -d' ')"
@@ -188,6 +195,23 @@ GITWEB_CONFIG="$fqgitdir/gitweb/gitweb_config.perl"
 export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG
 
 webrick_conf () {
+       # webrick seems to have no way of passing arbitrary environment
+       # variables to the underlying CGI executable, so we wrap the
+       # actual gitweb.cgi using a shell script to force it
+  wrapper="$fqgitdir/gitweb/$httpd/wrapper.sh"
+       cat > "$wrapper" <<EOF
+#!/bin/sh
+# we use this shell script wrapper around the real gitweb.cgi since
+# there appears to be no other way to pass arbitrary environment variables
+# into the CGI process
+GIT_EXEC_PATH=$GIT_EXEC_PATH GIT_DIR=$GIT_DIR GITWEB_CONFIG=$GITWEB_CONFIG
+export GIT_EXEC_PATH GIT_DIR GITWEB_CONFIG
+exec $root/gitweb.cgi
+EOF
+       chmod +x "$wrapper"
+
+       # This assumes _ruby_ is in the user's $PATH. that's _one_
+       # portable way to run ruby, which could be installed anywhere, really.
        # generate a standalone server script in $fqgitdir/gitweb.
        cat >"$fqgitdir/gitweb/$httpd.rb" <<EOF
 require 'webrick'
@@ -209,17 +233,18 @@ EOF
        # which assumes _ruby_ is in the user's $PATH. that's _one_
        # portable way to run ruby, which could be installed anywhere,
        # really.
-       cat >"$fqgitdir/gitweb/$httpd" <<EOF
+       cat >"$fqgitdir/gitweb/$httpd.sh" <<EOF
 #!/bin/sh
 exec ruby "$fqgitdir/gitweb/$httpd.rb" \$*
 EOF
-       chmod +x "$fqgitdir/gitweb/$httpd"
+       chmod +x "$fqgitdir/gitweb/$httpd.sh"
 
        cat >"$conf" <<EOF
 :Port: $port
 :DocumentRoot: "$root"
 :DirectoryIndex: ["gitweb.cgi"]
 :PidFile: "$fqgitdir/pid"
+:CGIInterpreter: "$wrapper"
 EOF
        test "$local" = true && echo ':BindAddress: "127.0.0.1"' >> "$conf"
 }