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|
#![allow(clippy::result_large_err)]
use std::{collections::BTreeMap, convert::TryInto, path::PathBuf};
use gix_odb::{Find, FindExt};
use gix_ref::{
transaction::{Change, LogChange, PreviousValue, RefEdit, RefLog},
Target, TargetRef,
};
use crate::{
ext::ObjectIdExt,
remote::{
fetch,
fetch::{refs::update::Mode, RefLogMessage, Source},
},
Repository,
};
///
pub mod update;
/// Information about the update of a single reference, corresponding the respective entry in [`RefMap::mappings`][crate::remote::fetch::RefMap::mappings].
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Update {
/// The way the update was performed.
pub mode: update::Mode,
/// The index to the edit that was created from the corresponding mapping, or `None` if there was no local ref.
pub edit_index: Option<usize>,
}
impl From<update::Mode> for Update {
fn from(mode: Mode) -> Self {
Update { mode, edit_index: None }
}
}
/// Update all refs as derived from `refmap.mappings` and produce an `Outcome` informing about all applied changes in detail, with each
/// [`update`][Update] corresponding to the [`fetch::Mapping`] of at the same index.
/// If `dry_run` is true, ref transactions won't actually be applied, but are assumed to work without error so the underlying
/// `repo` is not actually changed. Also it won't perform an 'object exists' check as these are likely not to exist as the pack
/// wasn't fetched either.
/// `action` is the prefix used for reflog entries, and is typically "fetch".
///
/// It can be used to produce typical information that one is used to from `git fetch`.
#[allow(clippy::too_many_arguments)]
pub(crate) fn update(
repo: &Repository,
message: RefLogMessage,
mappings: &[fetch::Mapping],
refspecs: &[gix_refspec::RefSpec],
extra_refspecs: &[gix_refspec::RefSpec],
fetch_tags: fetch::Tags,
dry_run: fetch::DryRun,
write_packed_refs: fetch::WritePackedRefs,
) -> Result<update::Outcome, update::Error> {
let mut edits = Vec::new();
let mut updates = Vec::new();
let implicit_tag_refspec = fetch_tags
.to_refspec()
.filter(|_| matches!(fetch_tags, crate::remote::fetch::Tags::Included));
for (remote, local, spec, is_implicit_tag) in mappings.iter().filter_map(
|fetch::Mapping {
remote,
local,
spec_index,
}| {
spec_index.get(refspecs, extra_refspecs).map(|spec| {
(
remote,
local,
spec,
implicit_tag_refspec.map_or(false, |tag_spec| spec.to_ref() == tag_spec),
)
})
},
) {
let remote_id = match remote.as_id() {
Some(id) => id,
None => continue,
};
if dry_run == fetch::DryRun::No && !repo.objects.contains(remote_id) {
let update = if is_implicit_tag {
update::Mode::ImplicitTagNotSentByRemote.into()
} else {
update::Mode::RejectedSourceObjectNotFound { id: remote_id.into() }.into()
};
updates.push(update);
continue;
}
let checked_out_branches = worktree_branches(repo)?;
let (mode, edit_index) = match local {
Some(name) => {
let (mode, reflog_message, name, previous_value) = match repo.try_find_reference(name)? {
Some(existing) => {
if let Some(wt_dir) = checked_out_branches.get(existing.name()) {
let mode = update::Mode::RejectedCurrentlyCheckedOut {
worktree_dir: wt_dir.to_owned(),
};
updates.push(mode.into());
continue;
}
match existing.target() {
TargetRef::Symbolic(_) => {
updates.push(update::Mode::RejectedSymbolic.into());
continue;
}
TargetRef::Peeled(local_id) => {
let previous_value =
PreviousValue::MustExistAndMatch(Target::Peeled(local_id.to_owned()));
let (mode, reflog_message) = if local_id == remote_id {
(update::Mode::NoChangeNeeded, "no update will be performed")
} else if let Some(gix_ref::Category::Tag) = existing.name().category() {
if spec.allow_non_fast_forward() {
(update::Mode::Forced, "updating tag")
} else {
updates.push(update::Mode::RejectedTagUpdate.into());
continue;
}
} else {
let mut force = spec.allow_non_fast_forward();
let is_fast_forward = match dry_run {
fetch::DryRun::No => {
let ancestors = repo
.find_object(local_id)?
.try_into_commit()
.map_err(|_| ())
.and_then(|c| {
c.committer().map(|a| a.time.seconds_since_unix_epoch).map_err(|_| ())
}).and_then(|local_commit_time|
remote_id
.to_owned()
.ancestors(|id, buf| repo.objects.find_commit_iter(id, buf))
.sorting(
gix_traverse::commit::Sorting::ByCommitTimeNewestFirstCutoffOlderThan {
time_in_seconds_since_epoch: local_commit_time
},
)
.map_err(|_| ())
);
match ancestors {
Ok(mut ancestors) => {
ancestors.any(|cid| cid.map_or(false, |cid| cid == local_id))
}
Err(_) => {
force = true;
false
}
}
}
fetch::DryRun::Yes => true,
};
if is_fast_forward {
(
update::Mode::FastForward,
matches!(dry_run, fetch::DryRun::Yes)
.then(|| "fast-forward (guessed in dry-run)")
.unwrap_or("fast-forward"),
)
} else if force {
(update::Mode::Forced, "forced-update")
} else {
updates.push(update::Mode::RejectedNonFastForward.into());
continue;
}
};
(mode, reflog_message, existing.name().to_owned(), previous_value)
}
}
}
None => {
let name: gix_ref::FullName = name.try_into()?;
let reflog_msg = match name.category() {
Some(gix_ref::Category::Tag) => "storing tag",
Some(gix_ref::Category::LocalBranch) => "storing head",
_ => "storing ref",
};
(
update::Mode::New,
reflog_msg,
name,
PreviousValue::ExistingMustMatch(Target::Peeled(remote_id.to_owned())),
)
}
};
let edit = RefEdit {
change: Change::Update {
log: LogChange {
mode: RefLog::AndReference,
force_create_reflog: false,
message: message.compose(reflog_message),
},
expected: previous_value,
new: if let Source::Ref(gix_protocol::handshake::Ref::Symbolic { target, .. }) = &remote {
match mappings.iter().find_map(|m| {
m.remote.as_name().and_then(|name| {
(name == target)
.then(|| m.local.as_ref().and_then(|local| local.try_into().ok()))
.flatten()
})
}) {
Some(local_branch) => {
// This is always safe because…
// - the reference may exist already
// - if it doesn't exist it will be created - we are here because it's in the list of mappings after all
// - if it exists and is updated, and the update is rejected due to non-fastforward for instance, the
// target reference still exists and we can point to it.
Target::Symbolic(local_branch)
}
None => Target::Peeled(remote_id.into()),
}
} else {
Target::Peeled(remote_id.into())
},
},
name,
deref: false,
};
let edit_index = edits.len();
edits.push(edit);
(mode, Some(edit_index))
}
None => (update::Mode::NoChangeNeeded, None),
};
updates.push(Update { mode, edit_index })
}
let edits = match dry_run {
fetch::DryRun::No => {
let (file_lock_fail, packed_refs_lock_fail) = repo
.config
.lock_timeout()
.map_err(crate::reference::edit::Error::from)?;
repo.refs
.transaction()
.packed_refs(
match write_packed_refs {
fetch::WritePackedRefs::Only => {
gix_ref::file::transaction::PackedRefs::DeletionsAndNonSymbolicUpdatesRemoveLooseSourceReference(Box::new(|oid, buf| {
repo.objects
.try_find(oid, buf)
.map(|obj| obj.map(|obj| obj.kind))
.map_err(|err| Box::new(err) as Box<dyn std::error::Error + Send + Sync + 'static>)
}))},
fetch::WritePackedRefs::Never => gix_ref::file::transaction::PackedRefs::DeletionsOnly
}
)
.prepare(edits, file_lock_fail, packed_refs_lock_fail)
.map_err(crate::reference::edit::Error::from)?
.commit(repo.committer().transpose().map_err(|err| update::Error::EditReferences(crate::reference::edit::Error::ParseCommitterTime(err)))?)
.map_err(crate::reference::edit::Error::from)?
}
fetch::DryRun::Yes => edits,
};
Ok(update::Outcome { edits, updates })
}
fn worktree_branches(repo: &Repository) -> Result<BTreeMap<gix_ref::FullName, PathBuf>, update::Error> {
let mut map = BTreeMap::new();
if let Some((wt_dir, head_ref)) = repo.work_dir().zip(repo.head_ref().ok().flatten()) {
map.insert(head_ref.inner.name, wt_dir.to_owned());
}
for proxy in repo.worktrees()? {
let repo = proxy.into_repo_with_possibly_inaccessible_worktree()?;
if let Some((wt_dir, head_ref)) = repo.work_dir().zip(repo.head_ref().ok().flatten()) {
map.insert(head_ref.inner.name, wt_dir.to_owned());
}
}
Ok(map)
}
#[cfg(test)]
mod tests;
|
