obsdiscovery: adopt to calling convention change
Upstream commits 71d83b315778 and abce899c985f changed the calling
convention of setdiscovery._takefullsample().
We inspect the signature of the function before calling it so
we can pass the proper arguments.
#!/bin/bash
set -euox pipefail
unset GREP_OPTIONS
NOTOPIC="--config experimental.topic-mode=ignore"
compatbranches=`hg branches --quiet | grep 'mercurial-' | grep -v ':' | sort -n --reverse`
prev='stable'
for branch in $compatbranches; do
hg up $branch
hg merge $prev
hg commit -m "test-compat: merge $prev into $branch"
prev=$branch
done