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'.
+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.
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
+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.
not contain the old commit).
--max-pack-size=<n>::
- Maximum size of each output packfile, expressed in MiB.
- The default is 4096 (4 GiB) as that is the maximum allowed
- packfile size (due to file format limitations). Some
- importers may wish to lower this, such as to ensure the
- resulting packfiles fit on CDs.
+ 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.
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
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'.
+ to 'git pack-objects'.
--quiet::
Disable all non-fatal output, making fast-import silent when it
Parallel Operation
------------------
-Like 'git-push' or 'git-fetch', imports handled by fast-import are safe to
+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
+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.
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 its recommended that
+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.
+
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
+same parser used by 'git am' when applying patches
received from email.
+
Some malformed strings may be accepted as valid dates. In some of
created by fast-import. There is no way to specify a different time or
timezone.
+
-This particular format is supplied as its short to implement and
+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'.
+'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
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
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, its treated as a SHA-1
+ 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.
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.
+with the standard 'git tag' process.
`reset`
~~~~~~~
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 its worth
+directly to `commit`. This is typically more work than it's worth
however, as marks are inexpensive to store and easy to use.
`data`
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
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
+Doing so will allow tools such as 'git blame' to track
through the real commit history and properly annotate the source
files.
~~~~~~~~~~~~~~~~~~~~~~~~~
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'.
+\--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.