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The git fetcher code used to dereference the (potentially empty) `ref`
input attribute. This was magically working, probably because the
compiler somehow outsmarted us, but is now blowing up with newer nixpkgs
versions.
Fix that by not trying to access this field while we don't know for sure
that it has been defined.
Fix #6554
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As discussed[1] this is most likely not desirable.
[1] https://github.com/NixOS/nix/pull/6440#issuecomment-1120876248
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Since a26be9f3b89be2ee90c6358250b9889b37f95cf8, the same parser is used
to parse the result of sourcehut’s `HEAD` endpoint (coming from [git
dumb protocol]) and the output of `git ls-remote`. However, they are very
slightly different (the former doesn’t specify the current reference
since it’s implied to be `HEAD`).
Unify both, and make the parser a bit more robust and understandable (by
making it more typed and adding tests for it)
[git dumb protocol]: https://git-scm.com/book/en/v2/Git-Internals-Transfer-Protocols#_the_dumb_protocol
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libfetchers/git: fix every occasion of a permission error
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I'm afraid I missed a few problematic `git(1)`-calls while implementing
PR #6440, sorry for that! Upon investigating what went wrong, I realized
that I only tested against the "cached"-case by accident because my
git-checkout with my system's flake was apparently cached during my
debugging.
I managed to trigger the original issue again by running:
$ git commit --allow-empty -m "tmp"
$ sudo nixos-rebuild switch --flake .# -L --builders ''
Since `repoDir` points to the checkout that's potentially owned by
another user, I decided to add `--git-dir` to each call affecting
`repoDir`.
Since the `tmpDir` for the temporary submodule-checkout is created by
Nix itself, it doesn't seem to be an issue.
Sorry for that, it should be fine now.
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These utility functions can be shared between the git and github fetchers.
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The previous head caching implementation stored two paths in the local
cache; one for the cached git repo and another textfile containing the
resolved HEAD ref. This commit instead stores the resolved HEAD by
setting the HEAD ref in the local cache appropriately.
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Extract the handling of a local dirty workdir to a helper function.
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Resolves the HEAD reference from the remote repository instead
of assuming "master".
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The `--git-dir=` must be `.` in some cases (for cached repos that are
"bare" repos in `~/.cache/nix/gitv3`). With this fix we can add
`--git-dir` to each `git`-invokation needed for `nixos-rebuild`.
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To demonstrate the problem:
* You need a `git` at 2.33.3 in your $PATH
* An expression like this in a git repository:
``` nix
{
outputs = { self, nixpkgs }: {
packages.foo.x86_64-linux = with nixpkgs.legacyPackages.x86_64-linux;
runCommand "snens" { } ''
echo ${(builtins.fetchGit ./.).lastModifiedDate} > $out
'';
};
}
```
Now, when instantiating the package via `builtins.getFlake`, it fails on
Nix 2.7 like this:
$ nix-instantiate -E '(builtins.getFlake "'"$(pwd)"'").packages.foo.x86_64-linux'
fatal: unsafe repository ('/nix/store/a7j3125km4h8l0p71q6ssfkxamfh5d61-source' is owned by someone else)
To add an exception for this directory, call:
git config --global --add safe.directory /nix/store/a7j3125km4h8l0p71q6ssfkxamfh5d61-source
error: program 'git' failed with exit code 128
(use '--show-trace' to show detailed location information)
This breaks e.g. `nixops`-deployments using flakes with similar
expressions as shown above.
The cause for this is that `git(1)` tries to find the highest
`.git`-directory in the directory tree and if it finds a such a
directory, but with another owning user (root vs. the user who evaluates
the expression), it fails as above. This was changed recently to fix
CVE-2022-24765[1].
By explicitly specifying `--git-dir`, Git assumes to be in the top-level
directory and doesn't attempt to look for a `.git`-directory in the
parent directories and thus the code-path leading to said error is never
reached.
[1] https://lore.kernel.org/git/xmqqv8veb5i6.fsf@gitster.g/
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assert hash types for Git and Mercurial
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The filter expects all paths to have a prefix of the raw `actualUrl`, but
`Store::addToStore(...)` provides absolute canonicalized paths.
To fix this create an absolute and canonicalized path from the `actualUrl` and
use it instead.
Fixes #6195.
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git fetcher: fix detection of dirty git workspaces
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Starting work on #5638
The exact boundary between `FetchSettings` and `EvalSettings` is not
clear to me, but that's fine. First lets clean out `libstore`, and then
worry about what, if anything, should be the separation between those
two.
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This is more consistent with flake terminology.
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diff-index operates on the view that git has of the working tree,
which might be outdated. The higher-level diff command does this
automatically. This change also adds handling for submodules.
fixes #4140
Alternative fixes would be invoking update-index before diff-index or
matching more closely what require_clean_work_tree from git-sh-setup.sh
does, but both those options make it more difficult to reason about
correctness.
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The .git/refs/heads directory might be empty for a valid
usable git repository. This often happens in CI environments,
which might only fetch commits, not branches.
Therefore instead we let git itself check if HEAD points to
something that looks like a commit.
fixes #5302
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git: extend cache dir lock over all mutating operations
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This reverts commit 6678e98411cd3bfe8143a4ba1b35d1451babce32, reversing
changes made to 90b2dd570cbd8313a8cf45b3cf66ddef2bb06e07.
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Also get rid of _killStderr because it wasn't actually checked
anywhere.
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libfetchers/git: fetch submodules by default
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Fix #3388
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This is required on NetBSD, and I think FreeBSD too.
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This fixes builtins.fetchGit { url = ...; ref = "HEAD"; }, that works in
stable nix (v2.3.10), but is broken in nix master:
$ ./result/bin/nix repl
Welcome to Nix version 2.4pre19700101_dd77f71. Type :? for help.
nix-repl> builtins.fetchGit { url = "https://github.com/NixOS/nix"; ref = "HEAD"; }
fetching Git repository 'https://github.com/NixOS/nix'fatal: couldn't find remote ref refs/heads/HEAD
error: program 'git' failed with exit code 128
The documentation for builtins.fetchGit says ref = "HEAD" is the
default, so it should also be supported to explicitly pass it.
I came across this issue because poetry2nix can use ref = "HEAD" in some
situations.
Fixes #4674.
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Local git repositories are normally used directly instead of
cloning. This commit checks if a repo is bare and forces a
clone.
Co-authored-by: Théophane Hufschmitt <regnat@users.noreply.github.com>
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Sometimes it's necessary to fetch a git repository at a revision and
it's unknown which ref contains the revision in question. An example
would be a Cargo.lock which only provides the URL and the revision when
using a git repository as build input.
However it's considered a bad practice to perform a full checkout of a
repository since this may take a lot of time and can eat up a lot of
disk space. This patch makes a full checkout explicit by adding an
`allRefs` argument to `builtins.fetchGit` which fetches all refs if
explicitly set to true.
Closes #2409
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revision can't be checked out
A common pitfall when using e.g. `builtins.fetchGit` is the `fatal: not
a tree object`-error when trying to fetch a revision of a git-repository
that isn't on the `master` branch and no `ref` is specified.
In order to make clear what's the problem, I added a simple check
whether the revision in question exists and if it doesn't a more
meaningful error-message is displayed:
```
nix-repl> builtins.fetchGit { url = "https://github.com/owner/myrepo"; rev = "<commit not on master>"; }
moderror: --- Error -------------------------------------------------------------------- nix
Cannot find Git revision 'bf1cc5c648e6aed7360448a3745bb2fe4fbbf0e9' in ref 'master' of repository 'https://gitlab.com/Ma27/nvim.nix'! Please make sure that the rev exists on the ref you've specified or add allRefs = true; to fetchGit.
```
Closes #2431
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Fixes:
$ nix build --store /tmp/nix /home/eelco/Dev/patchelf#hydraJobs.build.x86_64-linux
warning: Git tree '/home/eelco/Dev/patchelf' is dirty
error: --- RestrictedPathError ------------------------------------------------------------------------------------------- nix
access to path '/tmp/nix/nix/store/xmkvfmffk7xfnazykb5kx999aika8an4-source/flake.nix' is forbidden in restricted mode
(use '--show-trace' to show detailed location information)
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This was useful for an experiment with building Nix as a single
compilation unit. It's not very useful otherwise but also doesn't
hurt...
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This reduces compilation time by ~15 seconds (CPU time).
Issue #4045.
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When the log.showSignature git setting is enabled, the output of
"git log" contains signature verification information in addition to the
timestamp GitInputScheme::fetch wants:
$ git log -1 --format=%ct
gpg: Signature made Sat 07 Sep 2019 02:02:03 PM PDT
gpg: using RSA key 0123456789ABCDEF0123456789ABCDEF01234567
gpg: issuer "user@example.com"
gpg: Good signature from "User <user@example.com>" [ultimate] 1567890123
1567890123
For folks that had log.showSignature set, this caused all nix operations
on flakes to fail:
$ nix build
error: stoull
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better-ca-parse-errors
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