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hg: obtain lock when creating share from pooled repo (issue5104)...
hg: obtain lock when creating share from pooled repo (issue5104) There are race conditions between clients performing a shared clone to pooled storage: 1) Clients race to create the new shared repo in the pool directory 2) 1 client is seeding the repo in the pool directory and another goes to share it before it is fully cloned We prevent these race conditions by obtaining a lock in the pool directory that is derived from the name of the repo we will be accessing. To test this, a simple generic "lockdelay" extension has been added. The extension inserts an optional, configurable delay before or after lock acquisition. In the test, we delay 2 seconds after lock acquisition in the first process and 1 second before lock acquisition in the 2nd process. This means the first process has 1s to obtain the lock. There is a race condition here. If we encounter it in the wild, we could change the dummy extension to wait on the lock file to appear instead of relying on timing. But that's more complicated. Let's see what happens first.

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r19427:80983af3 default
r28289:d493d647 3.7.2 stable
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Makefile
47 lines | 1.2 KiB | text/x-makefile | MakefileLexer
SOURCES=$(notdir $(wildcard ../mercurial/help/*.[0-9].txt))
MAN=$(SOURCES:%.txt=%)
HTML=$(SOURCES:%.txt=%.html)
GENDOC=gendoc.py ../mercurial/commands.py ../mercurial/help.py \
../mercurial/help/*.txt ../hgext/*.py ../hgext/*/__init__.py
PREFIX=/usr/local
MANDIR=$(PREFIX)/share/man
INSTALL=install -c -m 644
PYTHON=python
RSTARGS=
export HGENCODING=UTF-8
all: man html
man: $(MAN)
html: $(HTML)
common.txt $(SOURCES) $(SOURCES:%.txt=%.gendoc.txt): $(GENDOC)
${PYTHON} gendoc.py $(basename $@) > $@.tmp
mv $@.tmp $@
%: %.txt %.gendoc.txt common.txt
$(PYTHON) runrst hgmanpage $(RSTARGS) --halt warning \
--strip-elements-with-class htmlonly $*.txt $*
%.html: %.txt %.gendoc.txt common.txt
$(PYTHON) runrst html $(RSTARGS) --halt warning \
--link-stylesheet --stylesheet-path style.css $*.txt $*.html
MANIFEST: man html
# tracked files are already in the main MANIFEST
$(RM) $@
for i in $(MAN) $(HTML); do \
echo "doc/$$i" >> $@ ; \
done
install: man
for i in $(MAN) ; do \
subdir=`echo $$i | sed -n 's/^.*\.\([0-9]\)$$/man\1/p'` ; \
mkdir -p $(DESTDIR)$(MANDIR)/$$subdir ; \
$(INSTALL) $$i $(DESTDIR)$(MANDIR)/$$subdir ; \
done
clean:
$(RM) $(MAN) $(HTML) common.txt $(SOURCES) $(SOURCES:%.txt=%.gendoc.txt) MANIFEST