[PATCH/RFC 0/2] fast-import: commit from null_sha1

Not so sure how null_sha1 parent should be treated in fast-import. Absent parent is represented as null_sha1 to the user in reflog, but isn't allowed as an argument for porcelain nor shows in most plumbing commands afaik.

These patches make fast-import treat
    commit refs/heads/master
    ...
    from `null_sha1`
like any other missing parent sha1 - reject such input.

Note: if we'll want this input to be valid, some other adjustments
to fast-import logic may be needed for consistency.

Dmitry Ivankov (2):
  fast-import: add 'commit from 0{40}' failing test
  fast-import: fix 'from 0{40}' test

 fast-import.c          |   17 ++++++-----------
 t/t9300-fast-import.sh |   12 ++++++++++++
 2 files changed, 18 insertions(+), 11 deletions(-)