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nix-channel: use nix-env -i --remove-all to upgrade

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Fixes #4110
This commit is contained in:
Guillaume Girol 2021-07-25 12:00:00 +00:00
parent 97be92569c
commit 136a613cce
1 changed files with 29 additions and 25 deletions
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26
src/nix-channel/nix-channel.cc
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@ -88,15 +88,6 @@ static void update(const StringSet & channelNames)
for (const auto & channel : channels) {
auto name = channel.first;
auto url = channel.second;
if (!(channelNames.empty() || channelNames.count(name)))
continue;
// We want to download the url to a file to see if it's a tarball while also checking if we
// got redirected in the process, so that we can grab the various parts of a nix channel
// definition from a consistent location if the redirect changes mid-download.
auto result = fetchers::downloadFile(store, url, std::string(baseNameOf(url)), false);
auto filename = store->toRealPath(result.storePath);
url = result.effectiveUrl;
// If the URL contains a version number, append it to the name
// attribute (so that "nix-env -q" on the channels profile
@ -109,6 +100,19 @@ static void update(const StringSet & channelNames)
std::string extraAttrs;
if (!(channelNames.empty() || channelNames.count(name))) {
// no need to update this channel, reuse the existing store path
Path symlink = profile + "/" + name;
Path storepath = dirOf(readLink(symlink));
exprs.push_back("f: rec { name = \"" + cname + "\"; type = \"derivation\"; outputs = [\"out\"]; system = \"builtin\"; outPath = builtins.storePath \"" + storepath + "\"; out = { inherit outPath; };}");
} else {
// We want to download the url to a file to see if it's a tarball while also checking if we
// got redirected in the process, so that we can grab the various parts of a nix channel
// definition from a consistent location if the redirect changes mid-download.
auto result = fetchers::downloadFile(store, url, std::string(baseNameOf(url)), false);
auto filename = store->toRealPath(result.storePath);
url = result.effectiveUrl;
bool unpacked = false;
if (std::regex_search(filename, std::regex("\\.tar\\.(gz|bz2|xz)$"))) {
runProgram(settings.nixBinDir + "/nix-build", false, { "--no-out-link", "--expr", "import " + unpackChannelPath +
@ -124,15 +128,15 @@ static void update(const StringSet & channelNames)
filename = store->toRealPath(fetchers::downloadFile(store, url + "/nixexprs.tar.bz2", "nixexprs.tar.bz2", false).storePath);
}
}
// Regardless of where it came from, add the expression representing this channel to accumulated expression
exprs.push_back("f: f { name = \"" + cname + "\"; channelName = \"" + name + "\"; src = builtins.storePath \"" + filename + "\"; " + extraAttrs + " }");
}
}
// Unpack the channel tarballs into the Nix store and install them
// into the channels profile.
std::cerr << "unpacking channels...\n";
Strings envArgs{ "--profile", profile, "--file", unpackChannelPath, "--install", "--from-expression" };
Strings envArgs{ "--profile", profile, "--file", unpackChannelPath, "--install", "--remove-all", "--from-expression" };
for (auto & expr : exprs)
envArgs.push_back(std::move(expr));
envArgs.push_back("--quiet");