git-instaweb: improve auto-discovery of httpd and call conventions.

This patch allows calling:

   git-instaweb -d apache2

and have the script Do The Right Thing. In particular, the auto-discovery
mechanism has been extended in order to be used for module listing as
well, and the call convention is that if the daemon is apache2/lighttpd
and the parameter to the "-d" option does not end by "-f", the "-f" is
added to the end of the option itself.

Change all backticks to $( ... ) as per Documentation/CodingGuidelines.

Signed-off-by: Flavio Poletti <flavio@polettix.it>
Acked-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-instaweb.sh b/git-instaweb.sh
index 6f91c8f845b2c4ef426a6451ac07abae2bce9488..af0fde538cefe8531031629cf78847da5eac4fa5 100755 (executable)
--- a/git-instaweb.sh
+++ b/git-instaweb.sh
@@ -22,10 +22,10 @@ restart        restart the web server
 . git-sh-setup
 
 fqgitdir="$GIT_DIR"
-local="`git config --bool --get instaweb.local`"
-httpd="`git config --get instaweb.httpd`"
-port=`git config --get instaweb.port`
-module_path="`git config --get instaweb.modulepath`"
+local="$(git config --bool --get instaweb.local)"
+httpd="$(git config --get instaweb.httpd)"
+port=$(git config --get instaweb.port)
+module_path="$(git config --get instaweb.modulepath)"
 
 conf="$GIT_DIR/gitweb/httpd.conf"
 
@@ -37,11 +37,21 @@ test -z "$httpd" && httpd='lighttpd -f'
 # any untaken local port will do...
 test -z "$port" && port=1234
 
-start_httpd () {
-       httpd_only="`echo $httpd | cut -f1 -d' '`"
+resolve_full_httpd () {
+       case "$httpd" in
+       *apache2*|*lighttpd*)
+               # ensure that the apache2/lighttpd command ends with "-f"
+               if ! echo "$httpd" | grep -- '-f *$' >/dev/null 2>&1
+               then
+                       httpd="$httpd -f"
+               fi
+               ;;
+       esac
+
+       httpd_only="$(echo $httpd | cut -f1 -d' ')"
        if case "$httpd_only" in /*) : ;; *) which $httpd_only >/dev/null;; esac
        then
-               $httpd "$fqgitdir/gitweb/httpd.conf"
+               full_httpd=$httpd
        else
                # many httpds are installed in /usr/sbin or /usr/local/sbin
                # these days and those are not in most users $PATHs
@@ -51,16 +61,23 @@ start_httpd () {
                do
                        if test -x "$i/$httpd_only"
                        then
-                               # don't quote $httpd, there can be
-                               # arguments to it (-f)
-                               $i/$httpd "$fqgitdir/gitweb/httpd.conf"
+                               full_httpd=$i/$httpd
                                return
                        fi
                done
-               echo "$httpd_only not found. Install $httpd_only or use" \
-                    "--httpd to specify another http daemon."
+
+               echo >&2 "$httpd_only not found. Install $httpd_only or use" \
+                    "--httpd to specify another httpd daemon."
                exit 1
        fi
+}
+
+start_httpd () {
+       # here $httpd should have a meaningful value
+       resolve_full_httpd
+
+       # don't quote $full_httpd, there can be arguments to it (-f)
+       $full_httpd "$fqgitdir/gitweb/httpd.conf"
        if test $? != 0; then
                echo "Could not execute http daemon $httpd."
                exit 1
@@ -68,7 +85,7 @@ start_httpd () {
 }
 
 stop_httpd () {
-       test -f "$fqgitdir/pid" && kill `cat "$fqgitdir/pid"`
+       test -f "$fqgitdir/pid" && kill $(cat "$fqgitdir/pid")
 }
 
 while test $# != 0
@@ -116,7 +133,7 @@ do
 done
 
 mkdir -p "$GIT_DIR/gitweb/tmp"
-GIT_EXEC_PATH="`git --exec-path`"
+GIT_EXEC_PATH="$(git --exec-path)"
 GIT_DIR="$fqgitdir"
 export GIT_EXEC_PATH GIT_DIR
 
@@ -215,7 +232,8 @@ PerlPassEnv GIT_EXEC_DIR
 EOF
        else
                # plain-old CGI
-               list_mods=`echo "$httpd" | sed "s/-f$/-l/"`
+               resolve_full_httpd
+               list_mods=$(echo "$full_httpd" | sed "s/-f$/-l/")
                $list_mods | grep 'mod_cgi\.c' >/dev/null 2>&1 || \
                echo "LoadModule cgi_module $module_path/mod_cgi.so" >> "$conf"
                cat >> "$conf" <<EOF