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Extract git reference parsing to a shared library

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These utility functions can be shared between the git and github fetchers.
This commit is contained in:
Kjetil Orbekk 2022-04-29 18:30:00 -04:00
parent c21afd684c
commit 9bf296c970
4 changed files with 70 additions and 35 deletions
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29
src/libfetchers/git.cc
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@ -6,6 +6,7 @@
#include "url-parts.hh"
#include "pathlocks.hh"
#include "util.hh"
#include "git-utils.hh"
#include "fetch-settings.hh"
@ -69,27 +70,19 @@ std::optional<std::string> readHead(const Path & path)
.args = {"ls-remote", "--symref", path},
});
if (exit_code != 0) {
return std::nullopt;
return std::nullopt;
}
// Matches the common case when HEAD points to a branch, e.g.:
// "ref: refs/heads/main HEAD".
const static std::regex head_ref_regex("^ref:\\s*([^\\s]+)\\s*HEAD$");
// Matches when HEAD points directly at a commit, e.g.:
// "71abcd... HEAD".
const static std::regex head_rev_regex("^([^\\s]+)\\s*HEAD$");
for (const auto & line : tokenizeString<std::vector<std::string>>(output, "\n")) {
std::smatch match;
if (std::regex_match(line, match, head_ref_regex)) {
debug("resolved HEAD ref '%s' for repo '%s'", match[1], path);
return match[1];
} else if (std::regex_match(line, match, head_rev_regex)) {
debug("resolved HEAD ref '%s' for repo '%s'", match[1], path);
return match[1];
}
std::string_view line = output;
line = line.substr(0, line.find("\n"));
if (const auto ref = parseListReferenceHeadRef(line); ref) {
debug("resolved HEAD ref '%s' for repo '%s'", *ref, path);
return *ref;
}
if (const auto rev = parseListReferenceForRev("HEAD", line); rev) {
debug("resolved HEAD rev '%s' for repo '%s'", *rev, path);
return *rev;
}
return std::nullopt;
}