repo-*: allow use of readlink or realpath

Linux coreutils provides readlink, and BSD systems tend to have realpath
available. Both commands provide similar functionality but of course have
different names. Add a check for either and use what is available.

While doing this, also unify some of the differences that have cropped up
between repo-add and repo-remove.

Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/repo-add.sh.in

@@ -103,8 +103,8 @@ write_list_entry() {
 #   arg1 - path to delta
 db_write_delta()
 {
-	# blank out all variables and set deltafile
+	# blank out all variables and set deltafile to absolute path
-	local deltafile=$(readlink -f "$1")
+	local deltafile=$($realpath "$1")
 	local filename=$(basename "$deltafile")
 	local deltavars pkgname fromver tover arch csize md5sum
 
@@ -134,8 +134,8 @@ db_write_delta()
 #   arg1 - path to package
 db_write_entry()
 {
-	# blank out all variables and set pkgfile
+	# blank out all variables and set pkgfile to an absolute path
-	local pkgfile=$(readlink -f "$1")
+	local pkgfile=$($realpath "$1")
 	local pkgname pkgver pkgdesc url builddate packager csize size \
 		group depend backup license replaces provides conflict force \
 		_groups _depends _backups _licenses _replaces _provides _conflicts \
@@ -278,6 +278,16 @@ if [ $# -lt 2 ]; then
 	exit 1
 fi
 
+# check for and store the name of a realpath-like program
+if [ $(type -t realpath) ]; then
+	realpath='realpath'
+elif [ $(type -t readlink) ]; then
+	realpath='readlink -f'
+else
+	error "$(gettext "Either realpath or readlink are required by repo-add.")"
+	exit 1 # $E_MISSING_PROGRAM
+fi
+
 # source system and user makepkg.conf
 if [ -r "$confdir/makepkg.conf" ]; then
 	source "$confdir/makepkg.conf"
@@ -304,7 +314,8 @@ for arg in "$@"; do
 	elif [ "$arg" == "--quiet" -o "$arg" == "-q" ]; then
 		QUIET=1
 	elif [ -z "$REPO_DB_FILE" ]; then
-		REPO_DB_FILE=$(readlink -f "$arg")
+		# store absolute path to repo DB
+		REPO_DB_FILE=$($realpath "$arg")
 		if ! test_repo_db_file; then
 			error "$(gettext "Repository file '%s' is not a proper pacman database.")" "$REPO_DB_FILE"
 			exit 1
@@ -331,7 +342,7 @@ done
 
 # if all operations were a success, re-zip database
 if [ $success -eq 1 ]; then
-	msg "$(gettext "Creating updated database file %s")" "$REPO_DB_FILE"
+	msg "$(gettext "Creating updated database file '%s'")" "$REPO_DB_FILE"
 	pushd "$gstmpdir" 2>&1 >/dev/null
 
 	if [ -n "$(ls)" ]; then

scripts/repo-remove.sh.in

@@ -126,6 +126,16 @@ if [ $# -lt 2 ]; then
 	exit 1
 fi
 
+# check for and store the name of a realpath-like program
+if [ $(type -t realpath) ]; then
+	realpath='realpath'
+elif [ $(type -t readlink) ]; then
+	realpath='readlink -f'
+else
+	error "$(gettext "Either realpath or readlink are required by repo-add.")"
+	exit 1 # $E_MISSING_PROGRAM
+fi
+
 # source system and user makepkg.conf
 if [ -r "$confdir/makepkg.conf" ]; then
 	source "$confdir/makepkg.conf"
@@ -149,9 +159,10 @@ for arg in "$@"; do
 	if [ "$arg" == "--quiet" -o "$arg" == "-q" ]; then
 		QUIET=1
 	elif [ -z "$REPO_DB_FILE" ]; then
-		REPO_DB_FILE=$(readlink -f "$arg")
+		# store absolute path to repo DB
+		REPO_DB_FILE=$($realpath "$arg")
 		if ! test_repo_db_file; then
-			error "$(gettext "Repository file '%s' is not a proper pacman database.")\n" "$REPO_DB_FILE"
+			error "$(gettext "Repository file '%s' is not a proper pacman database.")" "$REPO_DB_FILE"
 			exit 1
 		elif [ -f "$REPO_DB_FILE" ]; then
 			msg "$(gettext "Extracting database to a temporary location...")"
@@ -170,12 +181,13 @@ done
 
 # if all operations were a success, re-zip database
 if [ $success -eq 1 ]; then
-	msg "$(gettext "Creating updated database file '%s'...")" "$REPO_DB_FILE"
+	msg "$(gettext "Creating updated database file '%s'")" "$REPO_DB_FILE"
 	pushd "$gstmpdir" 2>&1 >/dev/null
 
 	if [ -n "$(ls)" ]; then
 		[ -f "${REPO_DB_FILE}.old" ] && rm "${REPO_DB_FILE}.old"
 		[ -f "$REPO_DB_FILE" ] && mv "$REPO_DB_FILE" "${REPO_DB_FILE}.old"
+
 		case "$DB_COMPRESSION" in
 			gz)  TAR_OPT="z" ;;
 			bz2) TAR_OPT="j" ;;
@@ -194,6 +206,6 @@ else
 fi
 
 # remove the temp directory used to unzip
-[ -d "$gstmpdir" ] && rm -rf $gstmpdir
+[ -d "$gstmpdir" ] && rm -rf "$gstmpdir"
 
 # vim: set ts=2 sw=2 noet: