repo-add; add option to remove existing package files from disk

When maintaining a custom repo, often it is undesirable to retain older
versions of packages. This patch adds the --remove option to remove the
current package file and it's signature from disk before adding the new
one to the database. Documentation is also updated. This is an optional
flag and default behaviour (leaving ondisk files alone) is not changed.

Signed-off-by: Phillip Smith <fukawi2@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

doc/repo-add.8.txt

@@ -75,6 +75,10 @@ repo-add Options
 	Only add packages that are not already in the database.  Warnings will be
 	printed upon detection of existing packages, but they will not be re-added.
 
+*-R, \--remove*::
+	Remove old package files from the disk when updating their entry in the
+	database.
+
 See Also
 --------
 linkman:makepkg[8], linkman:pacman[8], linkman:pkgdelta[8]

scripts/repo-add.sh.in

@@ -31,6 +31,7 @@ declare -r confdir='@sysconfdir@'
 QUIET=0
 DELTA=0
 ONLYADDNEW=0
+RMEXISTING=0
 WITHFILES=0
 SIGN=0
 VERIFY=0
@@ -58,6 +59,7 @@ Multiple packages to add can be specified on the command line.\n")"
 		printf -- "$(gettext "Options:\n")"
 		printf -- "$(gettext "  -d, --delta       generate and add delta for package update\n")"
 		printf -- "$(gettext "  -n, --new         only add packages that are not already in the database\n")"
+		printf -- "$(gettext "  -R, --remove      remove package file from disk when updating database entry\n")"
 		printf -- "$(gettext "  -f, --files       update database's file list\n")"
 	elif [[ $cmd == "repo-remove" ]] ; then
 		printf -- "$(gettext "Usage: repo-remove [options] <path-to-db> <packagename|delta> ...\n")"
@@ -304,6 +306,15 @@ db_write_entry() {
 				local oldfilename=$(grep -A1 FILENAME "$pkgentry/desc" | tail -n1)
 				local oldfile="$(dirname "$1")/$oldfilename"
 			fi
+		elif (( RMEXISTING )); then
+			# only remove existing package if we're not doing deltas
+			pkgentry=$(find_pkgentry "$pkgname")
+			if [[ -n $pkgentry ]]; then
+				local oldfilename="$(sed -n '/^%FILENAME%$/ {n;p;q;}' "$pkgentry/desc")"
+				local oldfile="$(dirname "$1")/$oldfilename"
+				msg2 "$(gettext "Removing existing package '%s'")" "$oldfilename"
+				rm -f ${oldfile} ${oldfile}.sig
+			fi
 		fi
 	fi
 
@@ -611,6 +622,7 @@ while (( $# )); do
 		-q|--quiet) QUIET=1;;
 		-d|--delta) DELTA=1;;
 		-n|--new) ONLYADDNEW=1;;
+		-R|--remove) RMEXISTING=1;;
 		-f|--files) WITHFILES=1;;
 		--nocolor) USE_COLOR='n';;
 		-s|--sign)