po/Makefile.am: use SOURCE_DATE_EPOCH to set POT creation date

When building RPMs for libvirt the PO files are part of libvirt-libs
package.  Now that we generate libvirt.pot during build time the POT
creation date is also generated at that time.

The issue here is that when building libvirt-libs for x86_64 and i686
the generated libvirt.pot file will have different POT creation date
which affects installed PO files as well which leads to conflict when
installing both x86_64 and i686 packages.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

diff --git a/po/Makefile.am b/po/Makefile.am
index 443d8a4dc1dfd7ccf5338e0608a4feeff09fc4da..277dd89d7df97dd60a5c9cc5193a247eefbf8e7d 100644 (file)
--- a/po/Makefile.am
+++ b/po/Makefile.am
@@ -45,10 +45,19 @@ XGETTEXT_ARGS = \
        --msgid-bugs-address="$(MSGID_BUGS_ADDRESS)" \
        $(NULL)
 
+POT_CREATION_DATE = $(shell \
+       if test -n "$$SOURCE_DATE_EPOCH"; \
+       then \
+               date --date="@$$SOURCE_DATE_EPOCH" +"%F %R%z"; \
+       else \
+               date +'%F %R%z'; \
+       fi)
+
 SED_PO_FIXUP_ARGS = \
        -e "s|text/plain; charset=CHARSET|text/plain; charset=UTF-8|g" \
        -e "s|SOME DESCRIPTIVE TITLE|Libvirt package strings|g" \
        -e "s|Copyright (C) YEAR|Copyright (C) $$(date +'%Y')|" \
+       -e "s|POT-Creation-Date:[^\]*|POT-Creation-Date: $(POT_CREATION_DATE)|" \
        $(NULL)
 
 update-po: $(POFILES)