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fetchMercurial: Don't fetch hashes we already have

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This commit is contained in:
Eelco Dolstra 2017-11-01 18:43:11 +01:00
parent 1969f357b7
commit e026bc3b05
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GPG key ID: 8170B4726D7198DE
4 changed files with 74 additions and 28 deletions
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26
src/libexpr/primops/fetchMercurial.cc
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@ -22,6 +22,8 @@ struct HgInfo
uint64_t revCount = 0;
};
std::regex commitHashRegex("^[0-9a-fA-F]{40}$");
HgInfo exportMercurial(ref<Store> store, const std::string & uri,
std::string rev, const std::string & name)
{
@ -66,20 +68,28 @@ HgInfo exportMercurial(ref<Store> store, const std::string & uri,
Path stampFile = fmt("%s/.hg/%s.stamp", cacheDir, hashString(htSHA512, rev).to_string(Base32, false));
/* If we haven't pulled this repo less than ‘tarball-ttl’ seconds,
do so now. FIXME: don't do this if "rev" is a hash and we
fetched it previously */
do so now. */
time_t now = time(0);
struct stat st;
if (stat(stampFile.c_str(), &st) != 0 ||
st.st_mtime < now - settings.tarballTtl)
{
Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", uri));
/* Except that if this is a commit hash that we already have,
we don't have to pull again. */
if (!(std::regex_match(rev, commitHashRegex)
&& pathExists(cacheDir)
&& runProgram(
RunOptions("hg", { "log", "-R", cacheDir, "-r", rev, "--template", "1" })
.killStderr(true)).second == "1"))
{
Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", uri));
if (pathExists(cacheDir)) {
runProgram("hg", true, { "pull", "-R", cacheDir, "--", uri });
} else {
createDirs(dirOf(cacheDir));
runProgram("hg", true, { "clone", "--noupdate", "--", uri, cacheDir });
if (pathExists(cacheDir)) {
runProgram("hg", true, { "pull", "-R", cacheDir, "--", uri });
} else {
createDirs(dirOf(cacheDir));
runProgram("hg", true, { "clone", "--noupdate", "--", uri, cacheDir });
}
}
writeFile(stampFile, "");