chore(3p/git): Unvendor git and track patches instead r/2903

This was vendored a long time ago under the expectation that keeping
it in sync with cgit would be easier this way, but it has proven not
to be a big issue.

On the other hand, a vendored copy of git is an annoying maintenance
burden. It is much easier to rebase the single (dottime) patch that we
have.

This removes the vendored copy of git and instead passes the git
source code to cgit via `pkgs.srcOnly`, which includes the applied
patch so that cgit can continue rendering dottime.

Change-Id: If31f62dea7ce688fd1b9050204e9378019775f2b

1 files changed, 0 insertions, 359 deletions

diff --git a/third_party/git/Documentation/technical/index-format.txt b/third_party/git/Documentation/technical/index-format.txt
deleted file mode 100644
index f9a3644711b9..000000000000
--- a/third_party/git/Documentation/technical/index-format.txt
+++ /dev/null
@@ -1,359 +0,0 @@
-Git index format
-================
-
-== The Git index file has the following format
-
-  All binary numbers are in network byte order.
-  In a repository using the traditional SHA-1, checksums and object IDs
-  (object names) mentioned below are all computed using SHA-1.  Similarly,
-  in SHA-256 repositories, these values are computed using SHA-256.
-  Version 2 is described here unless stated otherwise.
-
-   - A 12-byte header consisting of
-
-     4-byte signature:
-       The signature is { 'D', 'I', 'R', 'C' } (stands for "dircache")
-
-     4-byte version number:
-       The current supported versions are 2, 3 and 4.
-
-     32-bit number of index entries.
-
-   - A number of sorted index entries (see below).
-
-   - Extensions
-
-     Extensions are identified by signature. Optional extensions can
-     be ignored if Git does not understand them.
-
-     Git currently supports cached tree and resolve undo extensions.
-
-     4-byte extension signature. If the first byte is 'A'..'Z' the
-     extension is optional and can be ignored.
-
-     32-bit size of the extension
-
-     Extension data
-
-   - Hash checksum over the content of the index file before this checksum.
-
-== Index entry
-
-  Index entries are sorted in ascending order on the name field,
-  interpreted as a string of unsigned bytes (i.e. memcmp() order, no
-  localization, no special casing of directory separator '/'). Entries
-  with the same name are sorted by their stage field.
-
-  32-bit ctime seconds, the last time a file's metadata changed
-    this is stat(2) data
-
-  32-bit ctime nanosecond fractions
-    this is stat(2) data
-
-  32-bit mtime seconds, the last time a file's data changed
-    this is stat(2) data
-
-  32-bit mtime nanosecond fractions
-    this is stat(2) data
-
-  32-bit dev
-    this is stat(2) data
-
-  32-bit ino
-    this is stat(2) data
-
-  32-bit mode, split into (high to low bits)
-
-    4-bit object type
-      valid values in binary are 1000 (regular file), 1010 (symbolic link)
-      and 1110 (gitlink)
-
-    3-bit unused
-
-    9-bit unix permission. Only 0755 and 0644 are valid for regular files.
-    Symbolic links and gitlinks have value 0 in this field.
-
-  32-bit uid
-    this is stat(2) data
-
-  32-bit gid
-    this is stat(2) data
-
-  32-bit file size
-    This is the on-disk size from stat(2), truncated to 32-bit.
-
-  Object name for the represented object
-
-  A 16-bit 'flags' field split into (high to low bits)
-
-    1-bit assume-valid flag
-
-    1-bit extended flag (must be zero in version 2)
-
-    2-bit stage (during merge)
-
-    12-bit name length if the length is less than 0xFFF; otherwise 0xFFF
-    is stored in this field.
-
-  (Version 3 or later) A 16-bit field, only applicable if the
-  "extended flag" above is 1, split into (high to low bits).
-
-    1-bit reserved for future
-
-    1-bit skip-worktree flag (used by sparse checkout)
-
-    1-bit intent-to-add flag (used by "git add -N")
-
-    13-bit unused, must be zero
-
-  Entry path name (variable length) relative to top level directory
-    (without leading slash). '/' is used as path separator. The special
-    path components ".", ".." and ".git" (without quotes) are disallowed.
-    Trailing slash is also disallowed.
-
-    The exact encoding is undefined, but the '.' and '/' characters
-    are encoded in 7-bit ASCII and the encoding cannot contain a NUL
-    byte (iow, this is a UNIX pathname).
-
-  (Version 4) In version 4, the entry path name is prefix-compressed
-    relative to the path name for the previous entry (the very first
-    entry is encoded as if the path name for the previous entry is an
-    empty string).  At the beginning of an entry, an integer N in the
-    variable width encoding (the same encoding as the offset is encoded
-    for OFS_DELTA pack entries; see pack-format.txt) is stored, followed
-    by a NUL-terminated string S.  Removing N bytes from the end of the
-    path name for the previous entry, and replacing it with the string S
-    yields the path name for this entry.
-
-  1-8 nul bytes as necessary to pad the entry to a multiple of eight bytes
-  while keeping the name NUL-terminated.
-
-  (Version 4) In version 4, the padding after the pathname does not
-  exist.
-
-  Interpretation of index entries in split index mode is completely
-  different. See below for details.
-
-== Extensions
-
-=== Cached tree
-
-  Cached tree extension contains pre-computed hashes for trees that can
-  be derived from the index. It helps speed up tree object generation
-  from index for a new commit.
-
-  When a path is updated in index, the path must be invalidated and
-  removed from tree cache.
-
-  The signature for this extension is { 'T', 'R', 'E', 'E' }.
-
-  A series of entries fill the entire extension; each of which
-  consists of:
-
-  - NUL-terminated path component (relative to its parent directory);
-
-  - ASCII decimal number of entries in the index that is covered by the
-    tree this entry represents (entry_count);
-
-  - A space (ASCII 32);
-
-  - ASCII decimal number that represents the number of subtrees this
-    tree has;
-
-  - A newline (ASCII 10); and
-
-  - Object name for the object that would result from writing this span
-    of index as a tree.
-
-  An entry can be in an invalidated state and is represented by having
-  a negative number in the entry_count field. In this case, there is no
-  object name and the next entry starts immediately after the newline.
-  When writing an invalid entry, -1 should always be used as entry_count.
-
-  The entries are written out in the top-down, depth-first order.  The
-  first entry represents the root level of the repository, followed by the
-  first subtree--let's call this A--of the root level (with its name
-  relative to the root level), followed by the first subtree of A (with
-  its name relative to A), ...
-
-=== Resolve undo
-
-  A conflict is represented in the index as a set of higher stage entries.
-  When a conflict is resolved (e.g. with "git add path"), these higher
-  stage entries will be removed and a stage-0 entry with proper resolution
-  is added.
-
-  When these higher stage entries are removed, they are saved in the
-  resolve undo extension, so that conflicts can be recreated (e.g. with
-  "git checkout -m"), in case users want to redo a conflict resolution
-  from scratch.
-
-  The signature for this extension is { 'R', 'E', 'U', 'C' }.
-
-  A series of entries fill the entire extension; each of which
-  consists of:
-
-  - NUL-terminated pathname the entry describes (relative to the root of
-    the repository, i.e. full pathname);
-
-  - Three NUL-terminated ASCII octal numbers, entry mode of entries in
-    stage 1 to 3 (a missing stage is represented by "0" in this field);
-    and
-
-  - At most three object names of the entry in stages from 1 to 3
-    (nothing is written for a missing stage).
-
-=== Split index
-
-  In split index mode, the majority of index entries could be stored
-  in a separate file. This extension records the changes to be made on
-  top of that to produce the final index.
-
-  The signature for this extension is { 'l', 'i', 'n', 'k' }.
-
-  The extension consists of:
-
-  - Hash of the shared index file. The shared index file path
-    is $GIT_DIR/sharedindex.<hash>. If all bits are zero, the
-    index does not require a shared index file.
-
-  - An ewah-encoded delete bitmap, each bit represents an entry in the
-    shared index. If a bit is set, its corresponding entry in the
-    shared index will be removed from the final index.  Note, because
-    a delete operation changes index entry positions, but we do need
-    original positions in replace phase, it's best to just mark
-    entries for removal, then do a mass deletion after replacement.
-
-  - An ewah-encoded replace bitmap, each bit represents an entry in
-    the shared index. If a bit is set, its corresponding entry in the
-    shared index will be replaced with an entry in this index
-    file. All replaced entries are stored in sorted order in this
-    index. The first "1" bit in the replace bitmap corresponds to the
-    first index entry, the second "1" bit to the second entry and so
-    on. Replaced entries may have empty path names to save space.
-
-  The remaining index entries after replaced ones will be added to the
-  final index. These added entries are also sorted by entry name then
-  stage.
-
-== Untracked cache
-
-  Untracked cache saves the untracked file list and necessary data to
-  verify the cache. The signature for this extension is { 'U', 'N',
-  'T', 'R' }.
-
-  The extension starts with
-
-  - A sequence of NUL-terminated strings, preceded by the size of the
-    sequence in variable width encoding. Each string describes the
-    environment where the cache can be used.
-
-  - Stat data of $GIT_DIR/info/exclude. See "Index entry" section from
-    ctime field until "file size".
-
-  - Stat data of core.excludesfile
-
-  - 32-bit dir_flags (see struct dir_struct)
-
-  - Hash of $GIT_DIR/info/exclude. A null hash means the file
-    does not exist.
-
-  - Hash of core.excludesfile. A null hash means the file does
-    not exist.
-
-  - NUL-terminated string of per-dir exclude file name. This usually
-    is ".gitignore".
-
-  - The number of following directory blocks, variable width
-    encoding. If this number is zero, the extension ends here with a
-    following NUL.
-
-  - A number of directory blocks in depth-first-search order, each
-    consists of
-
-    - The number of untracked entries, variable width encoding.
-
-    - The number of sub-directory blocks, variable width encoding.
-
-    - The directory name terminated by NUL.
-
-    - A number of untracked file/dir names terminated by NUL.
-
-The remaining data of each directory block is grouped by type:
-
-  - An ewah bitmap, the n-th bit marks whether the n-th directory has
-    valid untracked cache entries.
-
-  - An ewah bitmap, the n-th bit records "check-only" bit of
-    read_directory_recursive() for the n-th directory.
-
-  - An ewah bitmap, the n-th bit indicates whether hash and stat data
-    is valid for the n-th directory and exists in the next data.
-
-  - An array of stat data. The n-th data corresponds with the n-th
-    "one" bit in the previous ewah bitmap.
-
-  - An array of hashes. The n-th hash corresponds with the n-th "one" bit
-    in the previous ewah bitmap.
-
-  - One NUL.
-
-== File System Monitor cache
-
-  The file system monitor cache tracks files for which the core.fsmonitor
-  hook has told us about changes.  The signature for this extension is
-  { 'F', 'S', 'M', 'N' }.
-
-  The extension starts with
-
-  - 32-bit version number: the current supported version is 1.
-
-  - 64-bit time: the extension data reflects all changes through the given
-	time which is stored as the nanoseconds elapsed since midnight,
-	January 1, 1970.
-
-  - 32-bit bitmap size: the size of the CE_FSMONITOR_VALID bitmap.
-
-  - An ewah bitmap, the n-th bit indicates whether the n-th index entry
-    is not CE_FSMONITOR_VALID.
-
-== End of Index Entry
-
-  The End of Index Entry (EOIE) is used to locate the end of the variable
-  length index entries and the beginning of the extensions. Code can take
-  advantage of this to quickly locate the index extensions without having
-  to parse through all of the index entries.
-
-  Because it must be able to be loaded before the variable length cache
-  entries and other index extensions, this extension must be written last.
-  The signature for this extension is { 'E', 'O', 'I', 'E' }.
-
-  The extension consists of:
-
-  - 32-bit offset to the end of the index entries
-
-  - Hash over the extension types and their sizes (but not
-	their contents).  E.g. if we have "TREE" extension that is N-bytes
-	long, "REUC" extension that is M-bytes long, followed by "EOIE",
-	then the hash would be:
-
-	Hash("TREE" + <binary representation of N> +
-		"REUC" + <binary representation of M>)
-
-== Index Entry Offset Table
-
-  The Index Entry Offset Table (IEOT) is used to help address the CPU
-  cost of loading the index by enabling multi-threading the process of
-  converting cache entries from the on-disk format to the in-memory format.
-  The signature for this extension is { 'I', 'E', 'O', 'T' }.
-
-  The extension consists of:
-
-  - 32-bit version (currently 1)
-
-  - A number of index offset entries each consisting of:
-
-    - 32-bit offset from the beginning of the file to the first cache entry
-	in this block of entries.
-
-    - 32-bit count of cache entries in this block