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readHead(): Make sure we're returning the HEAD ref line

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If we previously fetched by revision, the output of "git ls-remote"
won't start with the expected line like

  ref: refs/heads/master HEAD

but will be something like

  5c4410e3b9891c05ab40d723de78c6f0be45ad30        refs/heads/5c4410e3b9891c05ab40d723de78c6f0be45ad30

This then causes Nix to treat that revision as a refname, which then
leads to warnings like

  warning: could not update cached head '5c4410e3b9891c05ab40d723de78c6f0be45ad30' for 'file:///tmp/repo'

(cherry picked from commit c8b22643ba)
This commit is contained in:
Eelco Dolstra 2025-01-30 18:57:43 +01:00 • committed by Mergify
parent 1fe33c13d9
commit 8e4cd2f537
1 changed files with 1 additions and 1 deletions
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2
src/libfetchers/git.cc
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@ -69,7 +69,7 @@ std::optional<std::string> readHead(const Path & path)
std::string_view line = output; std::string_view line = output;
line = line.substr(0, line.find("\n")); line = line.substr(0, line.find("\n"));
if (const auto parseResult = git::parseLsRemoteLine(line)) { if (const auto parseResult = git::parseLsRemoteLine(line); parseResult && parseResult->reference == "HEAD") {
switch (parseResult->kind) { switch (parseResult->kind) {
case git::LsRemoteRefLine::Kind::Symbolic: case git::LsRemoteRefLine::Kind::Symbolic:
debug("resolved HEAD ref '%s' for repo '%s'", parseResult->target, path); debug("resolved HEAD ref '%s' for repo '%s'", parseResult->target, path);