iframe-proxy

ethomson · 2023-08-02T21:35:24Z

Provide a smart transport that executes ssh ... - this adds a mechanism for executing processes from libgit2, and uses it to invoke ssh and deal with the output.

bergkvist · 2023-08-03T20:04:43Z

ethomson · 2023-08-03T22:00:45Z

Neat, thanks for trying this out. Can you get a core or stack trace?

bergkvist · 2023-08-03T23:48:49Z

Valgrind:

valgrind ./target/debug/jj git fetch

==54547== Memcheck, a memory error detector
==54547== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==54547== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info
==54547== Command: ./target/debug/jj git fetch
==54547==
==54547== Invalid read of size 8
==54547==    at 0x1142164: git_transport_smart (smart.c:526)
==54547==    by 0x111AD1B: git_transport_new (transport.c:134)
==54547==    by 0x1103E77: git_remote_connect_ext (remote.c:960)
==54547==    by 0x11049CB: connect_or_reset_options (remote.c:1254)
==54547==    by 0x1104D5F: git_remote_download (remote.c:1339)
==54547==    by 0x82E8BF: git2::remote::Remote::download (remote.rs:249)
==54547==    by 0x87951B: jj_lib::git::fetch (git.rs:675)
==54547==    by 0x46AD5F: jj_cli::commands::git::cmd_git_fetch::{{closure}} (git.rs:303)
==54547==    by 0x469683: jj_cli::commands::git::with_remote_callbacks (git.rs:522)
==54547==    by 0x3FBF23: jj_cli::commands::git::cmd_git_fetch (git.rs:302)
==54547==    by 0x3F31D7: jj_cli::commands::git::cmd_git (git.rs:1027)
==54547==    by 0x276337: jj_cli::commands::run_command (mod.rs:3743)
==54547==  Address 0x10 is not stack'd, malloc'd or (recently) free'd
==54547==
==54547== Jump to the invalid address stated on the next line
==54547==    at 0x0: ???
==54547==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==54547==
==54547==
==54547== Process terminating with default action of signal 11 (SIGSEGV)
==54547==  Bad permissions for mapped region at address 0x0
==54547==    at 0x0: ???
==54547==
==54547== HEAP SUMMARY:
==54547==     in use at exit: 2,480,221 bytes in 23,448 blocks
==54547==   total heap usage: 336,841 allocs, 313,393 frees, 22,545,464 bytes allocated
==54547==
==54547== LEAK SUMMARY:
==54547==    definitely lost: 0 bytes in 0 blocks
==54547==    indirectly lost: 0 bytes in 0 blocks
==54547==      possibly lost: 182,032 bytes in 1,613 blocks
==54547==    still reachable: 2,298,189 bytes in 21,835 blocks
==54547==         suppressed: 0 bytes in 0 blocks
==54547== Rerun with --leak-check=full to see details of leaked memory
==54547==
==54547== For lists of detected and suppressed errors, rerun with: -s
==54547== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Segmentation fault

bergkvist · 2023-08-04T00:07:29Z

Commenting out the t->wrapped->free(t->wrapped); in smart.c:526 - I instead get:

Error: cannot create SSH transport; library was built without SSH support; class=Invalid (3)

ethomson · 2023-08-04T08:18:38Z

Oops, that's definitely a mistake. It looks like I haven't built that branch without any SSH support in a while. Thanks for catching that.

You'll need to configure libgit2 with cmake -DUSE_SSH=exec <other args> when you compile it. Sorry, I should have mentioned that upthread.

bergkvist · 2023-08-09T01:45:57Z

I had to do this to get it working: bergkvist/git2-rs@9a4d232 (git2-rs doesn't use cmake)

I would love for this to get merged into libgit2.

ethomson · 2023-08-09T20:44:04Z

We may want to support SSH but with a different provider that is not libssh2. Add GIT_SSH to indicate that we have some inbuilt SSH support and GIT_SSH_LIBSSH2 to indicate that support is via libssh2. This is similar to how we support GIT_HTTPS and GIT_OPENSSL, for example.

We can now use the `git_process` class to invoke OpenSSH and use it as an SSH transport. This may be preferred over libssh2 for a variety of callers.

We can't reliably detect SIGPIPE on close because of platform differences. Track `pid` and send `SIGTERM` to a function and ensure that we can detect it.

There are no custom callbacks for OpenSSH; don't test them.

Now that we (may) exec a child process to do ssh, we don't want valgrind reporting on that. Suppress children in valgrind runs.

A transport may want to validate that it's in a sane state; when flushing on close, don't assume that we're doing an upload-pack; send the correct direction.

Instead of "early EOF", provide information on _when_ we're seeing the EOF for debugging.

Suppress SIGPIPEs during writes to our piped process. On single-threaded applications, this is as simple as ignoring the signal. But since this is process-wide, on multi-threaded applications, we need to use some cumbersome `pthread_sigmask` manipulation. Thanks to https://www.doof.me.uk/2020/09/23/sigpipe-and-how-to-ignore-it/ and http://www.microhowto.info:80/howto/ignore_sigpipe_without_affecting_other_threads_in_a_process.html

Provide a mechanism for callers to read from stderr.

Provide more user-friendly error messages in smart protocol negotiation failures.

Don't capture stderr, optimize for the CLI case.

Provide both cmdline-style handling (passing it to the shell on POSIX, or directly to CreateProcess on win32) and execv style (passing it directly to execv on POSIX, and mangling it into a single command-line on win32).

Callers can specify the ssh command to invoke using `core.sshcommand` or the `GIT_SSH` environment variable. This is useful for specifying alternate configuration, and is particularly useful for our testing environment.

This helped when troubleshooting issues running the `ci/test.sh` script locally.

Handle custom paths for OpenSSH.

ethomson mentioned this pull request Aug 3, 2023

Support for SSH ProxyCommand #4872

Closed

bergkvist mentioned this pull request Aug 3, 2023

git: SSH config not respected jj-vcs/jj#63

Closed

bergkvist added a commit to bergkvist/git2-rs that referenced this pull request Aug 3, 2023

Update libgit2 to use libgit2/libgit2#6617

f40c271

ethomson added 20 commits August 30, 2023 20:45

Introduce git_strlist to manage string lists

0181b4c

Introduce git_process class that invokes processes

bc97d01

ssh: refactor libssh2-specific bits into their own file

67ab8f0

ssh: introduce GIT_SSH_EXEC for external OpenSSH

a8b052f

We can now use the `git_process` class to invoke OpenSSH and use it as an SSH transport. This may be preferred over libssh2 for a variety of callers.

ci: split ssh into exec and libssh2

38b16b0

process: test SIGTERM detection

7a8c4d8

We can't reliably detect SIGPIPE on close because of platform differences. Track `pid` and send `SIGTERM` to a function and ensure that we can detect it.

tests: use cl_fail_with correctly

cf133a8

ssh: only test callbacks for libssh2

10fbb5c

There are no custom callbacks for OpenSSH; don't test them.

ci: valgrind shouldn't report on exited children

a283c1b

Now that we (may) exec a child process to do ssh, we don't want valgrind reporting on that. Suppress children in valgrind runs.

smart: don't assume directionality

1c72c59

A transport may want to validate that it's in a sane state; when flushing on close, don't assume that we're doing an upload-pack; send the correct direction.

smart: unique error messages

0e62615

Instead of "early EOF", provide information on _when_ we're seeing the EOF for debugging.

process: reader for stderr

18474f7

Provide a mechanism for callers to read from stderr.

transport: provide clearer / unique error messages

bc124bb

Provide more user-friendly error messages in smart protocol negotiation failures.

ssh: don't capture stderr

23424f4

Don't capture stderr, optimize for the CLI case.

process: provide cmdline-handling and execv style

d7060af

Provide both cmdline-style handling (passing it to the shell on POSIX, or directly to CreateProcess on win32) and execv style (passing it directly to execv on POSIX, and mangling it into a single command-line on win32).

ssh: honor core.sshcommand

019cf6c

Callers can specify the ssh command to invoke using `core.sshcommand` or the `GIT_SSH` environment variable. This is useful for specifying alternate configuration, and is particularly useful for our testing environment.

ci: specify full path to certificate/key

3eb7ff2

This helped when troubleshooting issues running the `ci/test.sh` script locally.

ssh: exec with paths for OpenSSH

f26d92a

Handle custom paths for OpenSSH.

danielcompton mentioned this pull request Dec 2, 2024

Support SSH signing git-up/GitUp#1036

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Question: SSH Support libgit2/libgit2sharp#1422

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using SSH instead of username\password libgit2/libgit2sharp#1881

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Bump LibGit2Sharp from 0.30.0 to 0.31.0 ATrefzer/CSharpCodeAnalyst#39

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Add OpenSSH support#6617

Add OpenSSH support#6617
ethomson merged 21 commits into
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