Documentation/Makefile: fix interrupted builds of user-manual.xml

Unlike gcc, asciidoc does not atomically write its output file or
delete it when interrupted.  If it is interrupted in the middle of
writing an XML file, the result will be truncated input for xsltproc.

	XSLTPROC user-manual.html
	user-manual.xml:998: parser error : Premature end of data in t

Take care of this case by writing to a temporary and renaming it when
finished.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 8a8a3954dc45723f7380b59dadbb7e412198d672..04f69cf64e5d989bac3cd1c235e6a7e657c6c103 100644 (file)
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -264,7 +264,9 @@ manpage-base-url.xsl: manpage-base-url.xsl.in
        mv $@+ $@
 
 user-manual.xml: user-manual.txt user-manual.conf
-       $(QUIET_ASCIIDOC)$(ASCIIDOC) $(ASCIIDOC_EXTRA) -b docbook -d book $<
+       $(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
+       $(ASCIIDOC) $(ASCIIDOC_EXTRA) -b docbook -d book -o $@+ $< && \
+       mv $@+ $@
 
 technical/api-index.txt: technical/api-index-skel.txt \
        technical/api-index.sh $(patsubst %,%.txt,$(API_DOCS))
@@ -278,7 +280,9 @@ XSLT = docbook.xsl
 XSLTOPTS = --xinclude --stringparam html.stylesheet docbook-xsl.css
 
 user-manual.html: user-manual.xml
-       $(QUIET_XSLTPROC)xsltproc $(XSLTOPTS) -o $@ $(XSLT) $<
+       $(QUIET_XSLTPROC)$(RM) $@+ $@ && \
+       xsltproc $(XSLTOPTS) -o $@+ $(XSLT) $< && \
+       mv $@+ $@
 
 git.info: user-manual.texi
        $(QUIET_MAKEINFO)$(MAKEINFO) --no-split -o $@ user-manual.texi