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https://github.com/git/git
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e69ac42fcc
For a long time our general philosophy has been that it's unsafe to run arbitrary Git commands if you don't trust the hooks or config in .git, but that running upload-pack should be OK. E.g., see1456b043fc(Remove post-upload-hook, 2009-12-10), or the design of uploadpack.packObjectsHook. But we never really documented this (and even the discussions that led to1456b043fcwere not on the public list!). Let's try to make our approach more clear, but also be realistic that even upload-pack carries some risk. Helped-by: Filip Hejsek <filip.hejsek@gmail.com> Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
96 lines
2.9 KiB
Plaintext
96 lines
2.9 KiB
Plaintext
git-upload-pack(1)
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==================
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NAME
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----
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git-upload-pack - Send objects packed back to git-fetch-pack
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SYNOPSIS
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--------
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[verse]
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'git-upload-pack' [--[no-]strict] [--timeout=<n>] [--stateless-rpc]
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[--advertise-refs] <directory>
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DESCRIPTION
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-----------
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Invoked by 'git fetch-pack', learns what
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objects the other side is missing, and sends them after packing.
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This command is usually not invoked directly by the end user.
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The UI for the protocol is on the 'git fetch-pack' side, and the
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program pair is meant to be used to pull updates from a remote
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repository. For push operations, see 'git send-pack'.
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OPTIONS
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-------
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--[no-]strict::
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Do not try <directory>/.git/ if <directory> is no Git directory.
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--timeout=<n>::
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Interrupt transfer after <n> seconds of inactivity.
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--stateless-rpc::
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Perform only a single read-write cycle with stdin and stdout.
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This fits with the HTTP POST request processing model where
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a program may read the request, write a response, and must exit.
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--http-backend-info-refs::
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Used by linkgit:git-http-backend[1] to serve up
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`$GIT_URL/info/refs?service=git-upload-pack` requests. See
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"Smart Clients" in linkgit:gitprotocol-http[5] and "HTTP
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Transport" in the linkgit:gitprotocol-v2[5]
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documentation. Also understood by
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linkgit:git-receive-pack[1].
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<directory>::
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The repository to sync from.
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ENVIRONMENT
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-----------
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`GIT_PROTOCOL`::
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Internal variable used for handshaking the wire protocol. Server
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admins may need to configure some transports to allow this
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variable to be passed. See the discussion in linkgit:git[1].
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`GIT_NO_LAZY_FETCH`::
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When cloning or fetching from a partial repository (i.e., one
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itself cloned with `--filter`), the server-side `upload-pack`
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may need to fetch extra objects from its upstream in order to
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complete the request. By default, `upload-pack` will refuse to
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perform such a lazy fetch, because `git fetch` may run arbitrary
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commands specified in configuration and hooks of the source
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repository (and `upload-pack` tries to be safe to run even in
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untrusted `.git` directories).
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+
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This is implemented by having `upload-pack` internally set the
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`GIT_NO_LAZY_FETCH` variable to `1`. If you want to override it
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(because you are fetching from a partial clone, and you are sure
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you trust it), you can explicitly set `GIT_NO_LAZY_FETCH` to
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`0`.
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SECURITY
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--------
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Most Git commands should not be run in an untrusted `.git` directory
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(see the section `SECURITY` in linkgit:git[1]). `upload-pack` tries to
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avoid any dangerous configuration options or hooks from the repository
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it's serving, making it safe to clone an untrusted directory and run
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commands on the resulting clone.
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For an extra level of safety, you may be able to run `upload-pack` as an
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alternate user. The details will be platform dependent, but on many
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systems you can run:
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git clone --no-local --upload-pack='sudo -u nobody git-upload-pack' ...
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SEE ALSO
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--------
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linkgit:gitnamespaces[7]
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GIT
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---
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Part of the linkgit:git[1] suite
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