From 1343ffb414e74917b4e6f9eed05df035d25be4aa Mon Sep 17 00:00:00 2001
From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Fri, 12 Sep 2008 18:03:40 -0400
Subject: [PATCH] more portability fixes: GNU date and BSD date prognosticate
 differently.

---
 src/common              | 48 +++++++++++++++++++++++++++++++++++++++++
 src/monkeysphere-server |  7 +++---
 2 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/src/common b/src/common
index c8a7db6..48739d9 100644
--- a/src/common
+++ b/src/common
@@ -134,6 +134,54 @@ lock() {
     esac
 }
 
+
+# for portability, between gnu date and BSD date.
+# arguments should be:  number longunits format
+
+# e.g. advance_date 20 seconds +%F
+advance_date() {
+    local gnutry
+    local number="$1"
+    local longunits="$2"
+    local format="$3"
+    local shortunits
+
+    # try things the GNU way first 
+    if date -d "$number $longunits" "$format" >&/dev/null ; then
+	date -d "$number $longunits" "$format"
+    else
+	# otherwise, convert to (a limited version of) BSD date syntax:
+	case "$longunits" in
+	    years)
+		shortunits=y
+		;;
+	    months)
+		shortunits=m
+		;;
+	    weeks)
+		shortunits=w
+		;;
+	    days)
+		shortunits=d
+		;;
+	    hours)
+		shortunits=H
+		;;
+	    minutes)
+		shortunits=M
+		;;
+	    seconds)
+		shortunits=S
+		;;
+	    *)
+		# this is a longshot, and will likely fail; oh well.
+		shortunits="$longunits"
+	esac
+	date "-v+${number}${shortunits}" "$format"
+    fi
+}
+
+
 # check that characters are in a string (in an AND fashion).
 # used for checking key capability
 # check_capability capability a [b...]
diff --git a/src/monkeysphere-server b/src/monkeysphere-server
index e590f3c..b96a659 100755
--- a/src/monkeysphere-server
+++ b/src/monkeysphere-server
@@ -545,6 +545,7 @@ publish_server_key() {
     gpg_authentication "--keyserver $KEYSERVER --send-keys '0x${fingerprint}!'"
 }
 
+
 diagnostics() {
 #  * check on the status and validity of the key and public certificates
     local seckey
@@ -566,7 +567,7 @@ diagnostics() {
     curdate=$(date +%s)
     # warn when anything is 2 months away from expiration
     warnwindow='2 months'
-    warndate=$(date +%s -d "$warnwindow")
+    warndate=$(advance_date $warnwindow +%s)
 
     if ! id monkeysphere >/dev/null ; then
 	echo "! No monkeysphere user found!  Please create a monkeysphere system user."
@@ -593,7 +594,7 @@ diagnostics() {
 		echo "! Host key is expired."
 		echo " - Recommendation: extend lifetime of key with 'monkeysphere-server extend-key'"
 	    elif (( "$expire" < "$warndate" )); then
-		echo "! Host key expires in less than $warnwindow:" $(date -d "$(( $expire - $curdate )) seconds" +%F)
+		echo "! Host key expires in less than $warnwindow:" $(advance_date $(( $expire - $curdate )) seconds +%F)
 		echo " - Recommendation: extend lifetime of key with 'monkeysphere-server extend-key'"
 	    fi
 	fi
@@ -619,7 +620,7 @@ diagnostics() {
 		    echo "! User ID '$uid' is expired."
 			# FIXME: recommend a way to resolve this
 		elif (( "$expire" < "$warndate" )); then
-		    echo "! User ID '$uid' expires in less than $warnwindow:" $(date -d "$(( $expire - $curdate )) seconds" +%F)		
+		    echo "! User ID '$uid' expires in less than $warnwindow:" $(advance_date $(( $expire - $curdate )) seconds +%F)		
 		    # FIXME: recommend a way to resolve this
 		fi
 	    fi
-- 
2.26.2