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builtins.fetchgit: Support specifying commit hashes

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This adds an argument "rev" specififying the Git commit hash. The
existing argument "rev" is renamed to "ref". The default value for
"ref" is "master". When specifying a hash, it's necessary to specify a
ref since we're not cloning the entire repository but only fetching a
specific ref.

Example usage:

  builtins.fetchgit {
    url = https://github.com/NixOS/nixpkgs.git;
    ref = "release-16.03";
    rev = "c1c0484041ab6f9c6858c8ade80a8477c9ae4442";
  };
This commit is contained in:
Eelco Dolstra 2017-07-27 18:08:23 +02:00
parent 9f64cb89cb
commit 7480f4f9a4
No known key found for this signature in database
GPG key ID: 8170B4726D7198DE
2 changed files with 29 additions and 9 deletions
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34
src/libexpr/primops/fetchgit.cc
View file

@ -6,13 +6,27 @@
#include <sys/time.h>
#include <regex>
namespace nix {
Path exportGit(ref<Store> store, const std::string & uri, const std::string & rev)
Path exportGit(ref<Store> store, const std::string & uri,
const std::string & ref, const std::string & rev)
{
if (!isUri(uri))
throw EvalError(format("‘%s’ is not a valid URI") % uri);
if (rev != "") {
std::regex revRegex("^[0-9a-fA-F]{40}$");
if (!std::regex_match(rev, revRegex))
throw Error("invalid Git revision ‘%s’", rev);
}
// FIXME: too restrictive, but better safe than sorry.
std::regex refRegex("^[0-9a-zA-Z][0-9a-zA-Z.-]+$");
if (!std::regex_match(ref, refRegex))
throw Error("invalid Git ref ‘%s’", ref);
Path cacheDir = getCacheDir() + "/nix/git";
if (!pathExists(cacheDir)) {
@ -22,7 +36,7 @@ Path exportGit(ref<Store> store, const std::string & uri, const std::string & re
//Activity act(*logger, lvlInfo, format("fetching Git repository ‘%s’") % uri);
std::string localRef = hashString(htSHA256, fmt("%s-%s", uri, rev)).to_string(Base32, false);
std::string localRef = hashString(htSHA256, fmt("%s-%s", uri, ref)).to_string(Base32, false);
Path localRefFile = cacheDir + "/refs/heads/" + localRef;
@ -33,7 +47,7 @@ Path exportGit(ref<Store> store, const std::string & uri, const std::string & re
if (stat(localRefFile.c_str(), &st) != 0 ||
st.st_mtime < now - settings.tarballTtl)
{
runProgram("git", true, { "-C", cacheDir, "fetch", "--force", uri, rev + ":" + localRef });
runProgram("git", true, { "-C", cacheDir, "fetch", "--force", uri, ref + ":" + localRef });
struct timeval times[2];
times[0].tv_sec = now;
@ -44,7 +58,9 @@ Path exportGit(ref<Store> store, const std::string & uri, const std::string & re
utimes(localRefFile.c_str(), times);
}
std::string commitHash = chomp(readFile(localRefFile));
// FIXME: check whether rev is an ancestor of ref.
std::string commitHash =
rev != "" ? rev : chomp(readFile(localRefFile));
printTalkative("using revision %s of repo ‘%s’", uri, commitHash);
@ -81,7 +97,8 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
if (state.restricted) throw Error("‘fetchgit’ is not allowed in restricted mode");
std::string url;
std::string rev = "master";
std::string ref = "master";
std::string rev;
state.forceValue(*args[0]);
@ -95,7 +112,10 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
PathSet context;
url = state.coerceToString(*attr.pos, *attr.value, context, false, false);
if (hasPrefix(url, "/")) url = "file://" + url;
} else if (name == "rev")
}
else if (name == "ref")
ref = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (name == "rev")
rev = state.forceStringNoCtx(*attr.value, *attr.pos);
else
throw EvalError("unsupported argument ‘%s’ to ‘fetchgit’, at %s", attr.name, *attr.pos);
@ -107,7 +127,7 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
} else
url = state.forceStringNoCtx(*args[0], pos);
Path storePath = exportGit(state.store, url, rev);
Path storePath = exportGit(state.store, url, ref, rev);
mkString(v, storePath, PathSet({storePath}));
}

4
src/libexpr/primops/fetchgit.hh
View file

@ -8,7 +8,7 @@ namespace nix {
class Store;
Path exportGit(ref<Store> store,
const std::string & uri, const std::string & rev);
Path exportGit(ref<Store> store, const std::string & uri,
const std::string & ref, const std::string & rev = "");
}