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git-fast-import(1)
==================
NAME
----
git-fast-import - Backend for fast Git data importers
SYNOPSIS
--------
frontend | 'git fast-import' [options]
DESCRIPTION
-----------
This program is usually not what the end user wants to run directly.
Most end users want to use one of the existing frontend programs,
which parses a specific type of foreign source and feeds the contents
stored there to 'git fast-import'.
fast-import reads a mixed command/data stream from standard input and
writes one or more packfiles directly into the current repository.
When EOF is received on standard input, fast import writes out
updated branch and tag refs, fully updating the current repository
with the newly imported data.
The fast-import backend itself can import into an empty repository (one that
has already been initialized by 'git init') or incrementally
update an existing populated repository. Whether or not incremental
imports are supported from a particular foreign source depends on
the frontend program in use.
OPTIONS
-------
--date-format=<fmt>::
Specify the type of dates the frontend will supply to
fast-import within `author`, `committer` and `tagger` commands.
See ``Date Formats'' below for details about which formats
are supported, and their syntax.
--force::
Force updating modified existing branches, even if doing
so would cause commits to be lost (as the new commit does
not contain the old commit).
--max-pack-size=<n>::
Maximum size of each output packfile.
The default is unlimited.
--big-file-threshold=<n>::
Maximum size of a blob that fast-import will attempt to
create a delta for, expressed in bytes. The default is 512m
(512 MiB). Some importers may wish to lower this on systems
with constrained memory.
--depth=<n>::
Maximum delta depth, for blob and tree deltification.
Default is 10.
--active-branches=<n>::
Maximum number of branches to maintain active at once.
See ``Memory Utilization'' below for details. Default is 5.
--export-marks=<file>::
Dumps the internal marks table to <file> when complete.
Marks are written one per line as `:markid SHA-1`.
Frontends can use this file to validate imports after they
have been completed, or to save the marks table across
incremental runs. As <file> is only opened and truncated
at checkpoint (or completion) the same path can also be
safely given to \--import-marks.
--import-marks=<file>::
Before processing any input, load the marks specified in
<file>. The input file must exist, must be readable, and
must use the same format as produced by \--export-marks.
Multiple options may be supplied to import more than one
set of marks. If a mark is defined to different values,
the last file wins.
--relative-marks::
After specifying --relative-marks= the paths specified
with --import-marks= and --export-marks= are relative
to an internal directory in the current repository.
In git-fast-import this means that the paths are relative
to the .git/info/fast-import directory. However, other
importers may use a different location.
--no-relative-marks::
Negates a previous --relative-marks. Allows for combining
relative and non-relative marks by interweaving
--(no-)-relative-marks= with the --(import|export)-marks=
options.
--export-pack-edges=<file>::
After creating a packfile, print a line of data to
<file> listing the filename of the packfile and the last
commit on each branch that was written to that packfile.
This information may be useful after importing projects
whose total object set exceeds the 4 GiB packfile limit,
as these commits can be used as edge points during calls
to 'git pack-objects'.
--quiet::
Disable all non-fatal output, making fast-import silent when it
is successful. This option disables the output shown by
\--stats.
--stats::
Display some basic statistics about the objects fast-import has
created, the packfiles they were stored into, and the
memory used by fast-import during this run. Showing this output
is currently the default, but can be disabled with \--quiet.
Performance
-----------
The design of fast-import allows it to import large projects in a minimum
amount of memory usage and processing time. Assuming the frontend
is able to keep up with fast-import and feed it a constant stream of data,
import times for projects holding 10+ years of history and containing
100,000+ individual commits are generally completed in just 1-2
hours on quite modest (~$2,000 USD) hardware.
Most bottlenecks appear to be in foreign source data access (the
source just cannot extract revisions fast enough) or disk IO (fast-import
writes as fast as the disk will take the data). Imports will run
faster if the source data is stored on a different drive than the
destination Git repository (due to less IO contention).
Development Cost
----------------
A typical frontend for fast-import tends to weigh in at approximately 200
lines of Perl/Python/Ruby code. Most developers have been able to
create working importers in just a couple of hours, even though it
is their first exposure to fast-import, and sometimes even to Git. This is
an ideal situation, given that most conversion tools are throw-away
(use once, and never look back).
Parallel Operation
------------------
Like 'git push' or 'git fetch', imports handled by fast-import are safe to
run alongside parallel `git repack -a -d` or `git gc` invocations,
or any other Git operation (including 'git prune', as loose objects
are never used by fast-import).
fast-import does not lock the branch or tag refs it is actively importing.
After the import, during its ref update phase, fast-import tests each
existing branch ref to verify the update will be a fast-forward
update (the commit stored in the ref is contained in the new
history of the commit to be written). If the update is not a
fast-forward update, fast-import will skip updating that ref and instead
prints a warning message. fast-import will always attempt to update all
branch refs, and does not stop on the first failure.
Branch updates can be forced with \--force, but it's recommended that
this only be used on an otherwise quiet repository. Using \--force
is not necessary for an initial import into an empty repository.
Technical Discussion
--------------------
fast-import tracks a set of branches in memory. Any branch can be created
or modified at any point during the import process by sending a
`commit` command on the input stream. This design allows a frontend
program to process an unlimited number of branches simultaneously,
generating commits in the order they are available from the source
data. It also simplifies the frontend programs considerably.
fast-import does not use or alter the current working directory, or any
file within it. (It does however update the current Git repository,
as referenced by `GIT_DIR`.) Therefore an import frontend may use
the working directory for its own purposes, such as extracting file
revisions from the foreign source. This ignorance of the working
directory also allows fast-import to run very quickly, as it does not
need to perform any costly file update operations when switching
between branches.
Input Format
------------
With the exception of raw file data (which Git does not interpret)
the fast-import input format is text (ASCII) based. This text based
format simplifies development and debugging of frontend programs,
especially when a higher level language such as Perl, Python or
Ruby is being used.
fast-import is very strict about its input. Where we say SP below we mean
*exactly* one space. Likewise LF means one (and only one) linefeed.
Supplying additional whitespace characters will cause unexpected
results, such as branch names or file names with leading or trailing
spaces in their name, or early termination of fast-import when it encounters
unexpected input.
Stream Comments
~~~~~~~~~~~~~~~
To aid in debugging frontends fast-import ignores any line that
begins with `#` (ASCII pound/hash) up to and including the line
ending `LF`. A comment line may contain any sequence of bytes
that does not contain an LF and therefore may be used to include
any detailed debugging information that might be specific to the
frontend and useful when inspecting a fast-import data stream.
Date Formats
~~~~~~~~~~~~
The following date formats are supported. A frontend should select
the format it will use for this import by passing the format name
in the \--date-format=<fmt> command line option.
`raw`::
This is the Git native format and is `<time> SP <offutc>`.
It is also fast-import's default format, if \--date-format was
not specified.
+
The time of the event is specified by `<time>` as the number of
seconds since the UNIX epoch (midnight, Jan 1, 1970, UTC) and is
written as an ASCII decimal integer.
+
The local offset is specified by `<offutc>` as a positive or negative
offset from UTC. For example EST (which is 5 hours behind UTC)
would be expressed in `<tz>` by ``-0500'' while UTC is ``+0000''.
The local offset does not affect `<time>`; it is used only as an
advisement to help formatting routines display the timestamp.
+
If the local offset is not available in the source material, use
``+0000'', or the most common local offset. For example many
organizations have a CVS repository which has only ever been accessed
by users who are located in the same location and timezone. In this
case a reasonable offset from UTC could be assumed.
+
Unlike the `rfc2822` format, this format is very strict. Any
variation in formatting will cause fast-import to reject the value.
`rfc2822`::
This is the standard email format as described by RFC 2822.
+
An example value is ``Tue Feb 6 11:22:18 2007 -0500''. The Git
parser is accurate, but a little on the lenient side. It is the
same parser used by 'git am' when applying patches
received from email.
+
Some malformed strings may be accepted as valid dates. In some of
these cases Git will still be able to obtain the correct date from
the malformed string. There are also some types of malformed
strings which Git will parse wrong, and yet consider valid.
Seriously malformed strings will be rejected.
+
Unlike the `raw` format above, the timezone/UTC offset information
contained in an RFC 2822 date string is used to adjust the date
value to UTC prior to storage. Therefore it is important that
this information be as accurate as possible.
+
If the source material uses RFC 2822 style dates,
the frontend should let fast-import handle the parsing and conversion
(rather than attempting to do it itself) as the Git parser has
been well tested in the wild.
+
Frontends should prefer the `raw` format if the source material
already uses UNIX-epoch format, can be coaxed to give dates in that
format, or its format is easily convertible to it, as there is no
ambiguity in parsing.
`now`::
Always use the current time and timezone. The literal
`now` must always be supplied for `<when>`.
+
This is a toy format. The current time and timezone of this system
is always copied into the identity string at the time it is being
created by fast-import. There is no way to specify a different time or
timezone.
+
This particular format is supplied as it's short to implement and
may be useful to a process that wants to create a new commit
right now, without needing to use a working directory or
'git update-index'.
+
If separate `author` and `committer` commands are used in a `commit`
the timestamps may not match, as the system clock will be polled
twice (once for each command). The only way to ensure that both
author and committer identity information has the same timestamp
is to omit `author` (thus copying from `committer`) or to use a
date format other than `now`.
Commands
~~~~~~~~
fast-import accepts several commands to update the current repository
and control the current import process. More detailed discussion
(with examples) of each command follows later.
`commit`::
Creates a new branch or updates an existing branch by
creating a new commit and updating the branch to point at
the newly created commit.
`tag`::
Creates an annotated tag object from an existing commit or
branch. Lightweight tags are not supported by this command,
as they are not recommended for recording meaningful points
in time.
`reset`::
Reset an existing branch (or a new branch) to a specific
revision. This command must be used to change a branch to
a specific revision without making a commit on it.
`blob`::
Convert raw file data into a blob, for future use in a
`commit` command. This command is optional and is not
needed to perform an import.
`checkpoint`::
Forces fast-import to close the current packfile, generate its
unique SHA-1 checksum and index, and start a new packfile.
This command is optional and is not needed to perform
an import.
`progress`::
Causes fast-import to echo the entire line to its own
standard output. This command is optional and is not needed
to perform an import.
`feature`::
Require that fast-import supports the specified feature, or
abort if it does not.
`option`::
Specify any of the options listed under OPTIONS that do not
change stream semantic to suit the frontend's needs. This
command is optional and is not needed to perform an import.
`commit`
~~~~~~~~
Create or update a branch with a new commit, recording one logical
change to the project.
....
'commit' SP <ref> LF
mark?
('author' (SP <name>)? SP LT <email> GT SP <when> LF)?
'committer' (SP <name>)? SP LT <email> GT SP <when> LF
data
('from' SP <committish> LF)?
('merge' SP <committish> LF)?
(filemodify | filedelete | filecopy | filerename | filedeleteall | notemodify)*
LF?
....
where `<ref>` is the name of the branch to make the commit on.
Typically branch names are prefixed with `refs/heads/` in
Git, so importing the CVS branch symbol `RELENG-1_0` would use
`refs/heads/RELENG-1_0` for the value of `<ref>`. The value of
`<ref>` must be a valid refname in Git. As `LF` is not valid in
a Git refname, no quoting or escaping syntax is supported here.
A `mark` command may optionally appear, requesting fast-import to save a
reference to the newly created commit for future use by the frontend
(see below for format). It is very common for frontends to mark
every commit they create, thereby allowing future branch creation
from any imported commit.
The `data` command following `committer` must supply the commit
message (see below for `data` command syntax). To import an empty
commit message use a 0 length data. Commit messages are free-form
and are not interpreted by Git. Currently they must be encoded in
UTF-8, as fast-import does not permit other encodings to be specified.
Zero or more `filemodify`, `filedelete`, `filecopy`, `filerename`,
`filedeleteall` and `notemodify` commands
may be included to update the contents of the branch prior to
creating the commit. These commands may be supplied in any order.
However it is recommended that a `filedeleteall` command precede
all `filemodify`, `filecopy`, `filerename` and `notemodify` commands in
the same commit, as `filedeleteall` wipes the branch clean (see below).
The `LF` after the command is optional (it used to be required).
`author`
^^^^^^^^
An `author` command may optionally appear, if the author information
might differ from the committer information. If `author` is omitted
then fast-import will automatically use the committer's information for
the author portion of the commit. See below for a description of
the fields in `author`, as they are identical to `committer`.
`committer`
^^^^^^^^^^^
The `committer` command indicates who made this commit, and when
they made it.
Here `<name>` is the person's display name (for example
``Com M Itter'') and `<email>` is the person's email address
(``cm@example.com''). `LT` and `GT` are the literal less-than (\x3c)
and greater-than (\x3e) symbols. These are required to delimit
the email address from the other fields in the line. Note that
`<name>` is free-form and may contain any sequence of bytes, except
`LT` and `LF`. It is typically UTF-8 encoded.
The time of the change is specified by `<when>` using the date format
that was selected by the \--date-format=<fmt> command line option.
See ``Date Formats'' above for the set of supported formats, and
their syntax.
`from`
^^^^^^
The `from` command is used to specify the commit to initialize
this branch from. This revision will be the first ancestor of the
new commit.
Omitting the `from` command in the first commit of a new branch
will cause fast-import to create that commit with no ancestor. This
tends to be desired only for the initial commit of a project.
If the frontend creates all files from scratch when making a new
branch, a `merge` command may be used instead of `from` to start
the commit with an empty tree.
Omitting the `from` command on existing branches is usually desired,
as the current commit on that branch is automatically assumed to
be the first ancestor of the new commit.
As `LF` is not valid in a Git refname or SHA-1 expression, no
quoting or escaping syntax is supported within `<committish>`.
Here `<committish>` is any of the following:
* The name of an existing branch already in fast-import's internal branch
table. If fast-import doesn't know the name, it's treated as a SHA-1
expression.
* A mark reference, `:<idnum>`, where `<idnum>` is the mark number.
+
The reason fast-import uses `:` to denote a mark reference is this character
is not legal in a Git branch name. The leading `:` makes it easy
to distinguish between the mark 42 (`:42`) and the branch 42 (`42`
or `refs/heads/42`), or an abbreviated SHA-1 which happened to
consist only of base-10 digits.
+
Marks must be declared (via `mark`) before they can be used.
* A complete 40 byte or abbreviated commit SHA-1 in hex.
* Any valid Git SHA-1 expression that resolves to a commit. See
``SPECIFYING REVISIONS'' in linkgit:git-rev-parse[1] for details.
The special case of restarting an incremental import from the
current branch value should be written as:
----
from refs/heads/branch^0
----
The `{caret}0` suffix is necessary as fast-import does not permit a branch to
start from itself, and the branch is created in memory before the
`from` command is even read from the input. Adding `{caret}0` will force
fast-import to resolve the commit through Git's revision parsing library,
rather than its internal branch table, thereby loading in the
existing value of the branch.
`merge`
^^^^^^^
Includes one additional ancestor commit. If the `from` command is
omitted when creating a new branch, the first `merge` commit will be
the first ancestor of the current commit, and the branch will start
out with no files. An unlimited number of `merge` commands per
commit are permitted by fast-import, thereby establishing an n-way merge.
However Git's other tools never create commits with more than 15
additional ancestors (forming a 16-way merge). For this reason
it is suggested that frontends do not use more than 15 `merge`
commands per commit; 16, if starting a new, empty branch.
Here `<committish>` is any of the commit specification expressions
also accepted by `from` (see above).
`filemodify`
^^^^^^^^^^^^
Included in a `commit` command to add a new file or change the
content of an existing file. This command has two different means
of specifying the content of the file.
External data format::
The data content for the file was already supplied by a prior
`blob` command. The frontend just needs to connect it.
+
....
'M' SP <mode> SP <dataref> SP <path> LF
....
+
Here `<dataref>` can be either a mark reference (`:<idnum>`)
set by a prior `blob` command, or a full 40-byte SHA-1 of an
existing Git blob object.
Inline data format::
The data content for the file has not been supplied yet.
The frontend wants to supply it as part of this modify
command.
+
....
'M' SP <mode> SP 'inline' SP <path> LF
data
....
+
See below for a detailed description of the `data` command.
In both formats `<mode>` is the type of file entry, specified
in octal. Git only supports the following modes:
* `100644` or `644`: A normal (not-executable) file. The majority
of files in most projects use this mode. If in doubt, this is
what you want.
* `100755` or `755`: A normal, but executable, file.
* `120000`: A symlink, the content of the file will be the link target.
* `160000`: A gitlink, SHA-1 of the object refers to a commit in
another repository. Git links can only be specified by SHA or through
a commit mark. They are used to implement submodules.
In both formats `<path>` is the complete path of the file to be added
(if not already existing) or modified (if already existing).
A `<path>` string must use UNIX-style directory separators (forward
slash `/`), may contain any byte other than `LF`, and must not
start with double quote (`"`).
If an `LF` or double quote must be encoded into `<path>` shell-style
quoting should be used, e.g. `"path/with\n and \" in it"`.
The value of `<path>` must be in canonical form. That is it must not:
* contain an empty directory component (e.g. `foo//bar` is invalid),
* end with a directory separator (e.g. `foo/` is invalid),
* start with a directory separator (e.g. `/foo` is invalid),
* contain the special component `.` or `..` (e.g. `foo/./bar` and
`foo/../bar` are invalid).
It is recommended that `<path>` always be encoded using UTF-8.
`filedelete`
^^^^^^^^^^^^
Included in a `commit` command to remove a file or recursively
delete an entire directory from the branch. If the file or directory
removal makes its parent directory empty, the parent directory will
be automatically removed too. This cascades up the tree until the
first non-empty directory or the root is reached.
....
'D' SP <path> LF
....
here `<path>` is the complete path of the file or subdirectory to
be removed from the branch.
See `filemodify` above for a detailed description of `<path>`.
`filecopy`
^^^^^^^^^^^^
Recursively copies an existing file or subdirectory to a different
location within the branch. The existing file or directory must
exist. If the destination exists it will be completely replaced
by the content copied from the source.
....
'C' SP <path> SP <path> LF
....
here the first `<path>` is the source location and the second
`<path>` is the destination. See `filemodify` above for a detailed
description of what `<path>` may look like. To use a source path
that contains SP the path must be quoted.
A `filecopy` command takes effect immediately. Once the source
location has been copied to the destination any future commands
applied to the source location will not impact the destination of
the copy.
`filerename`
^^^^^^^^^^^^
Renames an existing file or subdirectory to a different location
within the branch. The existing file or directory must exist. If
the destination exists it will be replaced by the source directory.
....
'R' SP <path> SP <path> LF
....
here the first `<path>` is the source location and the second
`<path>` is the destination. See `filemodify` above for a detailed
description of what `<path>` may look like. To use a source path
that contains SP the path must be quoted.
A `filerename` command takes effect immediately. Once the source
location has been renamed to the destination any future commands
applied to the source location will create new files there and not
impact the destination of the rename.
Note that a `filerename` is the same as a `filecopy` followed by a
`filedelete` of the source location. There is a slight performance
advantage to using `filerename`, but the advantage is so small
that it is never worth trying to convert a delete/add pair in
source material into a rename for fast-import. This `filerename`
command is provided just to simplify frontends that already have
rename information and don't want bother with decomposing it into a
`filecopy` followed by a `filedelete`.
`filedeleteall`
^^^^^^^^^^^^^^^
Included in a `commit` command to remove all files (and also all
directories) from the branch. This command resets the internal
branch structure to have no files in it, allowing the frontend
to subsequently add all interesting files from scratch.
....
'deleteall' LF
....
This command is extremely useful if the frontend does not know
(or does not care to know) what files are currently on the branch,
and therefore cannot generate the proper `filedelete` commands to
update the content.
Issuing a `filedeleteall` followed by the needed `filemodify`
commands to set the correct content will produce the same results
as sending only the needed `filemodify` and `filedelete` commands.
The `filedeleteall` approach may however require fast-import to use slightly
more memory per active branch (less than 1 MiB for even most large
projects); so frontends that can easily obtain only the affected
paths for a commit are encouraged to do so.
`notemodify`
^^^^^^^^^^^^
Included in a `commit` command to add a new note (annotating a given
commit) or change the content of an existing note. This command has
two different means of specifying the content of the note.
External data format::
The data content for the note was already supplied by a prior
`blob` command. The frontend just needs to connect it to the
commit that is to be annotated.
+
....
'N' SP <dataref> SP <committish> LF
....
+
Here `<dataref>` can be either a mark reference (`:<idnum>`)
set by a prior `blob` command, or a full 40-byte SHA-1 of an
existing Git blob object.
Inline data format::
The data content for the note has not been supplied yet.
The frontend wants to supply it as part of this modify
command.
+
....
'N' SP 'inline' SP <committish> LF
data
....
+
See below for a detailed description of the `data` command.
In both formats `<committish>` is any of the commit specification
expressions also accepted by `from` (see above).
`mark`
~~~~~~
Arranges for fast-import to save a reference to the current object, allowing
the frontend to recall this object at a future point in time, without
knowing its SHA-1. Here the current object is the object creation
command the `mark` command appears within. This can be `commit`,
`tag`, and `blob`, but `commit` is the most common usage.
....
'mark' SP ':' <idnum> LF
....
where `<idnum>` is the number assigned by the frontend to this mark.
The value of `<idnum>` is expressed as an ASCII decimal integer.
The value 0 is reserved and cannot be used as
a mark. Only values greater than or equal to 1 may be used as marks.
New marks are created automatically. Existing marks can be moved
to another object simply by reusing the same `<idnum>` in another
`mark` command.
`tag`
~~~~~
Creates an annotated tag referring to a specific commit. To create
lightweight (non-annotated) tags see the `reset` command below.
....
'tag' SP <name> LF
'from' SP <committish> LF
'tagger' (SP <name>)? SP LT <email> GT SP <when> LF
data
....
where `<name>` is the name of the tag to create.
Tag names are automatically prefixed with `refs/tags/` when stored
in Git, so importing the CVS branch symbol `RELENG-1_0-FINAL` would
use just `RELENG-1_0-FINAL` for `<name>`, and fast-import will write the
corresponding ref as `refs/tags/RELENG-1_0-FINAL`.
The value of `<name>` must be a valid refname in Git and therefore
may contain forward slashes. As `LF` is not valid in a Git refname,
no quoting or escaping syntax is supported here.
The `from` command is the same as in the `commit` command; see
above for details.
The `tagger` command uses the same format as `committer` within
`commit`; again see above for details.
The `data` command following `tagger` must supply the annotated tag
message (see below for `data` command syntax). To import an empty
tag message use a 0 length data. Tag messages are free-form and are
not interpreted by Git. Currently they must be encoded in UTF-8,
as fast-import does not permit other encodings to be specified.
Signing annotated tags during import from within fast-import is not
supported. Trying to include your own PGP/GPG signature is not
recommended, as the frontend does not (easily) have access to the
complete set of bytes which normally goes into such a signature.
If signing is required, create lightweight tags from within fast-import with
`reset`, then create the annotated versions of those tags offline
with the standard 'git tag' process.
`reset`
~~~~~~~
Creates (or recreates) the named branch, optionally starting from
a specific revision. The reset command allows a frontend to issue
a new `from` command for an existing branch, or to create a new
branch from an existing commit without creating a new commit.
....
'reset' SP <ref> LF
('from' SP <committish> LF)?
LF?
....
For a detailed description of `<ref>` and `<committish>` see above
under `commit` and `from`.
The `LF` after the command is optional (it used to be required).
The `reset` command can also be used to create lightweight
(non-annotated) tags. For example:
====
reset refs/tags/938
from :938
====
would create the lightweight tag `refs/tags/938` referring to
whatever commit mark `:938` references.
`blob`
~~~~~~
Requests writing one file revision to the packfile. The revision
is not connected to any commit; this connection must be formed in
a subsequent `commit` command by referencing the blob through an
assigned mark.
....
'blob' LF
mark?
data
....
The mark command is optional here as some frontends have chosen
to generate the Git SHA-1 for the blob on their own, and feed that
directly to `commit`. This is typically more work than it's worth
however, as marks are inexpensive to store and easy to use.
`data`
~~~~~~
Supplies raw data (for use as blob/file content, commit messages, or
annotated tag messages) to fast-import. Data can be supplied using an exact
byte count or delimited with a terminating line. Real frontends
intended for production-quality conversions should always use the
exact byte count format, as it is more robust and performs better.
The delimited format is intended primarily for testing fast-import.
Comment lines appearing within the `<raw>` part of `data` commands
are always taken to be part of the body of the data and are therefore
never ignored by fast-import. This makes it safe to import any
file/message content whose lines might start with `#`.
Exact byte count format::
The frontend must specify the number of bytes of data.
+
....
'data' SP <count> LF
<raw> LF?
....
+
where `<count>` is the exact number of bytes appearing within
`<raw>`. The value of `<count>` is expressed as an ASCII decimal
integer. The `LF` on either side of `<raw>` is not
included in `<count>` and will not be included in the imported data.
+
The `LF` after `<raw>` is optional (it used to be required) but
recommended. Always including it makes debugging a fast-import
stream easier as the next command always starts in column 0
of the next line, even if `<raw>` did not end with an `LF`.
Delimited format::
A delimiter string is used to mark the end of the data.
fast-import will compute the length by searching for the delimiter.
This format is primarily useful for testing and is not
recommended for real data.
+
....
'data' SP '<<' <delim> LF
<raw> LF
<delim> LF
LF?
....
+
where `<delim>` is the chosen delimiter string. The string `<delim>`
must not appear on a line by itself within `<raw>`, as otherwise
fast-import will think the data ends earlier than it really does. The `LF`
immediately trailing `<raw>` is part of `<raw>`. This is one of
the limitations of the delimited format, it is impossible to supply
a data chunk which does not have an LF as its last byte.
+
The `LF` after `<delim> LF` is optional (it used to be required).
`checkpoint`
~~~~~~~~~~~~
Forces fast-import to close the current packfile, start a new one, and to
save out all current branch refs, tags and marks.
....
'checkpoint' LF
LF?
....
Note that fast-import automatically switches packfiles when the current
packfile reaches \--max-pack-size, or 4 GiB, whichever limit is
smaller. During an automatic packfile switch fast-import does not update
the branch refs, tags or marks.
As a `checkpoint` can require a significant amount of CPU time and
disk IO (to compute the overall pack SHA-1 checksum, generate the
corresponding index file, and update the refs) it can easily take
several minutes for a single `checkpoint` command to complete.
Frontends may choose to issue checkpoints during extremely large
and long running imports, or when they need to allow another Git
process access to a branch. However given that a 30 GiB Subversion
repository can be loaded into Git through fast-import in about 3 hours,
explicit checkpointing may not be necessary.
The `LF` after the command is optional (it used to be required).
`progress`
~~~~~~~~~~
Causes fast-import to print the entire `progress` line unmodified to
its standard output channel (file descriptor 1) when the command is
processed from the input stream. The command otherwise has no impact
on the current import, or on any of fast-import's internal state.
....
'progress' SP <any> LF
LF?
....
The `<any>` part of the command may contain any sequence of bytes
that does not contain `LF`. The `LF` after the command is optional.
Callers may wish to process the output through a tool such as sed to
remove the leading part of the line, for example:
====
frontend | git fast-import | sed 's/^progress //'
====
Placing a `progress` command immediately after a `checkpoint` will
inform the reader when the `checkpoint` has been completed and it
can safely access the refs that fast-import updated.
`feature`
~~~~~~~~~
Require that fast-import supports the specified feature, or abort if
it does not.
....
'feature' SP <feature> LF
....
The <feature> part of the command may be any string matching
^[a-zA-Z][a-zA-Z-]*$ and should be understood by fast-import.
Feature work identical as their option counterparts with the
exception of the import-marks feature, see below.
The following features are currently supported:
* date-format
* import-marks
* export-marks
* relative-marks
* no-relative-marks
* force
The import-marks behaves differently from when it is specified as
commandline option in that only one "feature import-marks" is allowed
per stream. Also, any --import-marks= specified on the commandline
will override those from the stream (if any).
`option`
~~~~~~~~
Processes the specified option so that git fast-import behaves in a
way that suits the frontend's needs.
Note that options specified by the frontend are overridden by any
options the user may specify to git fast-import itself.
....
'option' SP <option> LF
....
The `<option>` part of the command may contain any of the options
listed in the OPTIONS section that do not change import semantics,
without the leading '--' and is treated in the same way.
Option commands must be the first commands on the input (not counting
feature commands), to give an option command after any non-option
command is an error.
The following commandline options change import semantics and may therefore
not be passed as option:
* date-format
* import-marks
* export-marks
* force
Crash Reports
-------------
If fast-import is supplied invalid input it will terminate with a
non-zero exit status and create a crash report in the top level of
the Git repository it was importing into. Crash reports contain
a snapshot of the internal fast-import state as well as the most
recent commands that lead up to the crash.
All recent commands (including stream comments, file changes and
progress commands) are shown in the command history within the crash
report, but raw file data and commit messages are excluded from the
crash report. This exclusion saves space within the report file
and reduces the amount of buffering that fast-import must perform
during execution.
After writing a crash report fast-import will close the current
packfile and export the marks table. This allows the frontend
developer to inspect the repository state and resume the import from
the point where it crashed. The modified branches and tags are not
updated during a crash, as the import did not complete successfully.
Branch and tag information can be found in the crash report and
must be applied manually if the update is needed.
An example crash:
====
$ cat >in <<END_OF_INPUT
# my very first test commit
commit refs/heads/master
committer Shawn O. Pearce <spearce> 19283 -0400
# who is that guy anyway?
data <<EOF
this is my commit
EOF
M 644 inline .gitignore
data <<EOF
.gitignore
EOF
M 777 inline bob
END_OF_INPUT
$ git fast-import <in
fatal: Corrupt mode: M 777 inline bob
fast-import: dumping crash report to .git/fast_import_crash_8434
$ cat .git/fast_import_crash_8434
fast-import crash report:
fast-import process: 8434
parent process : 1391
at Sat Sep 1 00:58:12 2007
fatal: Corrupt mode: M 777 inline bob
Most Recent Commands Before Crash
---------------------------------
# my very first test commit
commit refs/heads/master
committer Shawn O. Pearce <spearce> 19283 -0400
# who is that guy anyway?
data <<EOF
M 644 inline .gitignore
data <<EOF
* M 777 inline bob
Active Branch LRU
-----------------
active_branches = 1 cur, 5 max
pos clock name
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1) 0 refs/heads/master
Inactive Branches
-----------------
refs/heads/master:
status : active loaded dirty
tip commit : 0000000000000000000000000000000000000000
old tree : 0000000000000000000000000000000000000000
cur tree : 0000000000000000000000000000000000000000
commit clock: 0
last pack :
-------------------
END OF CRASH REPORT
====
Tips and Tricks
---------------
The following tips and tricks have been collected from various
users of fast-import, and are offered here as suggestions.
Use One Mark Per Commit
~~~~~~~~~~~~~~~~~~~~~~~
When doing a repository conversion, use a unique mark per commit
(`mark :<n>`) and supply the \--export-marks option on the command
line. fast-import will dump a file which lists every mark and the Git
object SHA-1 that corresponds to it. If the frontend can tie
the marks back to the source repository, it is easy to verify the
accuracy and completeness of the import by comparing each Git
commit to the corresponding source revision.
Coming from a system such as Perforce or Subversion this should be
quite simple, as the fast-import mark can also be the Perforce changeset
number or the Subversion revision number.
Freely Skip Around Branches
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Don't bother trying to optimize the frontend to stick to one branch
at a time during an import. Although doing so might be slightly
faster for fast-import, it tends to increase the complexity of the frontend
code considerably.
The branch LRU builtin to fast-import tends to behave very well, and the
cost of activating an inactive branch is so low that bouncing around
between branches has virtually no impact on import performance.
Handling Renames
~~~~~~~~~~~~~~~~
When importing a renamed file or directory, simply delete the old
name(s) and modify the new name(s) during the corresponding commit.
Git performs rename detection after-the-fact, rather than explicitly
during a commit.
Use Tag Fixup Branches
~~~~~~~~~~~~~~~~~~~~~~
Some other SCM systems let the user create a tag from multiple
files which are not from the same commit/changeset. Or to create
tags which are a subset of the files available in the repository.
Importing these tags as-is in Git is impossible without making at
least one commit which ``fixes up'' the files to match the content
of the tag. Use fast-import's `reset` command to reset a dummy branch
outside of your normal branch space to the base commit for the tag,
then commit one or more file fixup commits, and finally tag the
dummy branch.
For example since all normal branches are stored under `refs/heads/`
name the tag fixup branch `TAG_FIXUP`. This way it is impossible for
the fixup branch used by the importer to have namespace conflicts
with real branches imported from the source (the name `TAG_FIXUP`
is not `refs/heads/TAG_FIXUP`).
When committing fixups, consider using `merge` to connect the
commit(s) which are supplying file revisions to the fixup branch.
Doing so will allow tools such as 'git blame' to track
through the real commit history and properly annotate the source
files.
After fast-import terminates the frontend will need to do `rm .git/TAG_FIXUP`
to remove the dummy branch.
Import Now, Repack Later
~~~~~~~~~~~~~~~~~~~~~~~~
As soon as fast-import completes the Git repository is completely valid
and ready for use. Typically this takes only a very short time,
even for considerably large projects (100,000+ commits).
However repacking the repository is necessary to improve data
locality and access performance. It can also take hours on extremely
large projects (especially if -f and a large \--window parameter is
used). Since repacking is safe to run alongside readers and writers,
run the repack in the background and let it finish when it finishes.
There is no reason to wait to explore your new Git project!
If you choose to wait for the repack, don't try to run benchmarks
or performance tests until repacking is completed. fast-import outputs
suboptimal packfiles that are simply never seen in real use
situations.
Repacking Historical Data
~~~~~~~~~~~~~~~~~~~~~~~~~
If you are repacking very old imported data (e.g. older than the
last year), consider expending some extra CPU time and supplying
\--window=50 (or higher) when you run 'git repack'.
This will take longer, but will also produce a smaller packfile.
You only need to expend the effort once, and everyone using your
project will benefit from the smaller repository.
Include Some Progress Messages
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Every once in a while have your frontend emit a `progress` message
to fast-import. The contents of the messages are entirely free-form,
so one suggestion would be to output the current month and year
each time the current commit date moves into the next month.
Your users will feel better knowing how much of the data stream
has been processed.
Packfile Optimization
---------------------
When packing a blob fast-import always attempts to deltify against the last
blob written. Unless specifically arranged for by the frontend,
this will probably not be a prior version of the same file, so the
generated delta will not be the smallest possible. The resulting
packfile will be compressed, but will not be optimal.
Frontends which have efficient access to all revisions of a
single file (for example reading an RCS/CVS ,v file) can choose
to supply all revisions of that file as a sequence of consecutive
`blob` commands. This allows fast-import to deltify the different file
revisions against each other, saving space in the final packfile.
Marks can be used to later identify individual file revisions during
a sequence of `commit` commands.
The packfile(s) created by fast-import do not encourage good disk access
patterns. This is caused by fast-import writing the data in the order
it is received on standard input, while Git typically organizes
data within packfiles to make the most recent (current tip) data
appear before historical data. Git also clusters commits together,
speeding up revision traversal through better cache locality.
For this reason it is strongly recommended that users repack the
repository with `git repack -a -d` after fast-import completes, allowing
Git to reorganize the packfiles for faster data access. If blob
deltas are suboptimal (see above) then also adding the `-f` option
to force recomputation of all deltas can significantly reduce the
final packfile size (30-50% smaller can be quite typical).
Memory Utilization
------------------
There are a number of factors which affect how much memory fast-import
requires to perform an import. Like critical sections of core
Git, fast-import uses its own memory allocators to amortize any overheads
associated with malloc. In practice fast-import tends to amortize any
malloc overheads to 0, due to its use of large block allocations.
per object
~~~~~~~~~~
fast-import maintains an in-memory structure for every object written in
this execution. On a 32 bit system the structure is 32 bytes,
on a 64 bit system the structure is 40 bytes (due to the larger
pointer sizes). Objects in the table are not deallocated until
fast-import terminates. Importing 2 million objects on a 32 bit system
will require approximately 64 MiB of memory.
The object table is actually a hashtable keyed on the object name
(the unique SHA-1). This storage configuration allows fast-import to reuse
an existing or already written object and avoid writing duplicates
to the output packfile. Duplicate blobs are surprisingly common
in an import, typically due to branch merges in the source.
per mark
~~~~~~~~
Marks are stored in a sparse array, using 1 pointer (4 bytes or 8
bytes, depending on pointer size) per mark. Although the array
is sparse, frontends are still strongly encouraged to use marks
between 1 and n, where n is the total number of marks required for
this import.
per branch
~~~~~~~~~~
Branches are classified as active and inactive. The memory usage
of the two classes is significantly different.
Inactive branches are stored in a structure which uses 96 or 120
bytes (32 bit or 64 bit systems, respectively), plus the length of
the branch name (typically under 200 bytes), per branch. fast-import will
easily handle as many as 10,000 inactive branches in under 2 MiB
of memory.
Active branches have the same overhead as inactive branches, but
also contain copies of every tree that has been recently modified on
that branch. If subtree `include` has not been modified since the
branch became active, its contents will not be loaded into memory,
but if subtree `src` has been modified by a commit since the branch
became active, then its contents will be loaded in memory.
As active branches store metadata about the files contained on that
branch, their in-memory storage size can grow to a considerable size
(see below).
fast-import automatically moves active branches to inactive status based on
a simple least-recently-used algorithm. The LRU chain is updated on
each `commit` command. The maximum number of active branches can be
increased or decreased on the command line with \--active-branches=.
per active tree
~~~~~~~~~~~~~~~
Trees (aka directories) use just 12 bytes of memory on top of the
memory required for their entries (see ``per active file'' below).
The cost of a tree is virtually 0, as its overhead amortizes out
over the individual file entries.
per active file entry
~~~~~~~~~~~~~~~~~~~~~
Files (and pointers to subtrees) within active trees require 52 or 64
bytes (32/64 bit platforms) per entry. To conserve space, file and
tree names are pooled in a common string table, allowing the filename
``Makefile'' to use just 16 bytes (after including the string header
overhead) no matter how many times it occurs within the project.
The active branch LRU, when coupled with the filename string pool
and lazy loading of subtrees, allows fast-import to efficiently import
projects with 2,000+ branches and 45,114+ files in a very limited
memory footprint (less than 2.7 MiB per active branch).
Author
------
Written by Shawn O. Pearce <spearce@spearce.org>.
Documentation
--------------
Documentation by Shawn O. Pearce <spearce@spearce.org>.
GIT
---
Part of the linkgit:git[1] suite
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