Revision 2501aff8b7516115c409cb34cc50305cdde40a47 authored by Jeff King on 28 September 2013, 08:31:45 UTC, committed by Jonathan Nieder on 14 October 2013, 23:55:13 UTC
When we are handling a curl response code in http_request or in the remote-curl RPC code, we use the handle_curl_result helper to translate curl's response into an easy-to-use code. When we see an HTTP 401, we do one of two things: 1. If we already had a filled-in credential, we mark it as rejected, and then return HTTP_NOAUTH to indicate to the caller that we failed. 2. If we didn't, then we ask for a new credential and tell the caller HTTP_REAUTH to indicate that they may want to try again. Rejecting in the first case makes sense; it is the natural result of the request we just made. However, prompting for more credentials in the second step does not always make sense. We do not know for sure that the caller is going to make a second request, and nor are we sure that it will be to the same URL. Logically, the prompt belongs not to the request we just finished, but to the request we are (maybe) about to make. In practice, it is very hard to trigger any bad behavior. Currently, if we make a second request, it will always be to the same URL (even in the face of redirects, because curl handles the redirects internally). And we almost always retry on HTTP_REAUTH these days. The one exception is if we are streaming a large RPC request to the server (e.g., a pushed packfile), in which case we cannot restart. It's extremely unlikely to see a 401 response at this stage, though, as we would typically have seen it when we sent a probe request, before streaming the data. This patch drops the automatic prompt out of case 2, and instead requires the caller to do it. This is a few extra lines of code, and the bug it fixes is unlikely to come up in practice. But it is conceptually cleaner, and paves the way for better handling of credentials across redirects. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
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git-bundle.txt
git-bundle(1)
=============
NAME
----
git-bundle - Move objects and refs by archive
SYNOPSIS
--------
[verse]
'git bundle' create <file> <git-rev-list-args>
'git bundle' verify <file>
'git bundle' list-heads <file> [<refname>...]
'git bundle' unbundle <file> [<refname>...]
DESCRIPTION
-----------
Some workflows require that one or more branches of development on one
machine be replicated on another machine, but the two machines cannot
be directly connected, and therefore the interactive Git protocols (git,
ssh, rsync, http) cannot be used. This command provides support for
'git fetch' and 'git pull' to operate by packaging objects and references
in an archive at the originating machine, then importing those into
another repository using 'git fetch' and 'git pull'
after moving the archive by some means (e.g., by sneakernet). As no
direct connection between the repositories exists, the user must specify a
basis for the bundle that is held by the destination repository: the
bundle assumes that all objects in the basis are already in the
destination repository.
OPTIONS
-------
create <file>::
Used to create a bundle named 'file'. This requires the
'git-rev-list-args' arguments to define the bundle contents.
verify <file>::
Used to check that a bundle file is valid and will apply
cleanly to the current repository. This includes checks on the
bundle format itself as well as checking that the prerequisite
commits exist and are fully linked in the current repository.
'git bundle' prints a list of missing commits, if any, and exits
with a non-zero status.
list-heads <file>::
Lists the references defined in the bundle. If followed by a
list of references, only references matching those given are
printed out.
unbundle <file>::
Passes the objects in the bundle to 'git index-pack'
for storage in the repository, then prints the names of all
defined references. If a list of references is given, only
references matching those in the list are printed. This command is
really plumbing, intended to be called only by 'git fetch'.
<git-rev-list-args>::
A list of arguments, acceptable to 'git rev-parse' and
'git rev-list' (and containing a named ref, see SPECIFYING REFERENCES
below), that specifies the specific objects and references
to transport. For example, `master~10..master` causes the
current master reference to be packaged along with all objects
added since its 10th ancestor commit. There is no explicit
limit to the number of references and objects that may be
packaged.
[<refname>...]::
A list of references used to limit the references reported as
available. This is principally of use to 'git fetch', which
expects to receive only those references asked for and not
necessarily everything in the pack (in this case, 'git bundle' acts
like 'git fetch-pack').
SPECIFYING REFERENCES
---------------------
'git bundle' will only package references that are shown by
'git show-ref': this includes heads, tags, and remote heads. References
such as `master~1` cannot be packaged, but are perfectly suitable for
defining the basis. More than one reference may be packaged, and more
than one basis can be specified. The objects packaged are those not
contained in the union of the given bases. Each basis can be
specified explicitly (e.g. `^master~10`), or implicitly (e.g.
`master~10..master`, `--since=10.days.ago master`).
It is very important that the basis used be held by the destination.
It is okay to err on the side of caution, causing the bundle file
to contain objects already in the destination, as these are ignored
when unpacking at the destination.
EXAMPLE
-------
Assume you want to transfer the history from a repository R1 on machine A
to another repository R2 on machine B.
For whatever reason, direct connection between A and B is not allowed,
but we can move data from A to B via some mechanism (CD, email, etc.).
We want to update R2 with development made on the branch master in R1.
To bootstrap the process, you can first create a bundle that does not have
any basis. You can use a tag to remember up to what commit you last
processed, in order to make it easy to later update the other repository
with an incremental bundle:
----------------
machineA$ cd R1
machineA$ git bundle create file.bundle master
machineA$ git tag -f lastR2bundle master
----------------
Then you transfer file.bundle to the target machine B. Because this
bundle does not require any existing object to be extracted, you can
create a new repository on machine B by cloning from it:
----------------
machineB$ git clone -b master /home/me/tmp/file.bundle R2
----------------
This will define a remote called "origin" in the resulting repository that
lets you fetch and pull from the bundle. The $GIT_DIR/config file in R2 will
have an entry like this:
------------------------
[remote "origin"]
url = /home/me/tmp/file.bundle
fetch = refs/heads/*:refs/remotes/origin/*
------------------------
To update the resulting mine.git repository, you can fetch or pull after
replacing the bundle stored at /home/me/tmp/file.bundle with incremental
updates.
After working some more in the original repository, you can create an
incremental bundle to update the other repository:
----------------
machineA$ cd R1
machineA$ git bundle create file.bundle lastR2bundle..master
machineA$ git tag -f lastR2bundle master
----------------
You then transfer the bundle to the other machine to replace
/home/me/tmp/file.bundle, and pull from it.
----------------
machineB$ cd R2
machineB$ git pull
----------------
If you know up to what commit the intended recipient repository should
have the necessary objects, you can use that knowledge to specify the
basis, giving a cut-off point to limit the revisions and objects that go
in the resulting bundle. The previous example used the lastR2bundle tag
for this purpose, but you can use any other options that you would give to
the linkgit:git-log[1] command. Here are more examples:
You can use a tag that is present in both:
----------------
$ git bundle create mybundle v1.0.0..master
----------------
You can use a basis based on time:
----------------
$ git bundle create mybundle --since=10.days master
----------------
You can use the number of commits:
----------------
$ git bundle create mybundle -10 master
----------------
You can run `git-bundle verify` to see if you can extract from a bundle
that was created with a basis:
----------------
$ git bundle verify mybundle
----------------
This will list what commits you must have in order to extract from the
bundle and will error out if you do not have them.
A bundle from a recipient repository's point of view is just like a
regular repository which it fetches or pulls from. You can, for example, map
references when fetching:
----------------
$ git fetch mybundle master:localRef
----------------
You can also see what references it offers:
----------------
$ git ls-remote mybundle
----------------
GIT
---
Part of the linkgit:git[1] suite
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