comparison mercurial/debugcommands.py @ 47676:096ee2e260a3

dirstate-v2: Rename Header to Root, move it to the end of the data file

Now that they don’t have to be at the start, a given data file may contain
multiple "roots". A docket only points to one of them, and previous ones
are left unused to allow allow append-only in-place writing to an existing
data file.

Differential Revision: https://phab.mercurial-scm.org/D11090

47675:48aec076b8fb

def debugdirstateignorepatternshash(ui, repo, **opts):
    """show the hash of ignore patterns stored in dirstate if v2,
    or nothing for dirstate-v2
    """
    if repo.dirstate._use_dirstate_v2:
        hash_offset = 16  # Four 32-bit integers before this field
        hash_len = 20  # 160 bits for SHA-1
        data_filename = repo.dirstate._map.docket.data_filename()
        with repo.vfs(data_filename) as f:
            hash_bytes = f.read(hash_offset + hash_len)[-hash_len:]
        ui.write(binascii.hexlify(hash_bytes) + b'\n')


@command(
    b'debugdiscovery',

47676:096ee2e260a3

def debugdirstateignorepatternshash(ui, repo, **opts):
    """show the hash of ignore patterns stored in dirstate if v2,
    or nothing for dirstate-v2
    """
    if repo.dirstate._use_dirstate_v2:
        docket = repo.dirstate._map.docket
        hash_len = 20  # 160 bits for SHA-1
        hash_offset = docket.data_size - hash_len  # hash is at the end
        data_filename = docket.data_filename()
        with repo.vfs(data_filename) as f:
            f.seek(hash_offset)
            hash_bytes = f.read(hash_len)
        ui.write(binascii.hexlify(hash_bytes) + b'\n')


@command(
    b'debugdiscovery',