comparison tests/test-branches.t @ 51974:4c885d5ff132

rev-branch-cache: stop pretending we will overwrite data when we don't

We were issuing a message about overwriting data even when we were about to
write 0 bytes in pratice. This is silly. Instead we point at the extra data
remaining in the file (in case someone is using debug to debug something).

51973:bb281ecf4036

recovery from invalid cache revs file with trailing data
  $ echo >> .hg/cache/rbc-revs-v2
  $ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
  5
  overwriting 0 bytes from 160 in cache/rbc-revs-v2 leaving (2 trailing bytes)
  $ f --size .hg/cache/rbc-revs*
  .hg/cache/rbc-revs-v2: size=162

recovery from invalid cache file with partial last record
  $ mv .hg/cache/rbc-revs-v2 .

51974:4c885d5ff132

recovery from invalid cache revs file with trailing data
  $ echo >> .hg/cache/rbc-revs-v2
  $ rm -f .hg/cache/branch* && hg head a -T '{rev}\n' --debug
  5
  cache/rbc-revs-v2 contains 2 unknown trailing bytes
  $ f --size .hg/cache/rbc-revs*
  .hg/cache/rbc-revs-v2: size=162

recovery from invalid cache file with partial last record
  $ mv .hg/cache/rbc-revs-v2 .