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Input: Replace markFileChanged() by putFile()

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Committing a lock file using markFileChanged() required the input to
be writable by the caller in the local filesystem (using the path
returned by getSourcePath()). putFile() abstracts over this.

(cherry picked from commit 95d657c8b3)
Change-Id: Ie081c5d9eb4e923b229191c5e23ece85145557ff
This commit is contained in:
Eelco Dolstra 2023-10-25 18:18:15 +02:00 committed by lunaphied
parent 3d065192c0
commit b525d0f20c
8 changed files with 110 additions and 59 deletions
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25
src/libexpr/flake/flake.cc
View file

@ -627,12 +627,7 @@ LockedFlake lockFlake(
debug("new lock file: %s", newLockFile);
auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
auto sourcePath = topRef.input.getSourcePath();
auto outputLockFilePath = sourcePath ? std::optional{*sourcePath + "/" + relPath} : std::nullopt;
if (lockFlags.outputLockFilePath) {
outputLockFilePath = lockFlags.outputLockFilePath;
}
/* Check whether we need to / can write the new lock file. */
if (newLockFile != oldLockFile || lockFlags.outputLockFilePath) {
@ -640,7 +635,7 @@ LockedFlake lockFlake(
auto diff = LockFile::diff(oldLockFile, newLockFile);
if (lockFlags.writeLockFile) {
if (outputLockFilePath) {
if (sourcePath || lockFlags.outputLockFilePath) {
if (auto unlockedInput = newLockFile.isUnlocked()) {
if (fetchSettings.warnDirty)
warn("will not write lock file of flake '%s' because it has an unlocked input ('%s')", topRef, *unlockedInput);
@ -648,6 +643,14 @@ LockedFlake lockFlake(
if (!lockFlags.updateLockFile)
throw Error("flake '%s' requires lock file changes but they're not allowed due to '--no-update-lock-file'", topRef);
auto newLockFileS = fmt("%s\n", newLockFile);
if (lockFlags.outputLockFilePath)
writeFile(*lockFlags.outputLockFilePath, newLockFileS);
else {
auto relPath = (topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock";
auto outputLockFilePath = sourcePath ? std::optional{*sourcePath + "/" + relPath} : std::nullopt;
bool lockFileExists = pathExists(*outputLockFilePath);
if (lockFileExists) {
@ -659,9 +662,8 @@ LockedFlake lockFlake(
} else
warn("creating lock file '%s'", *outputLockFilePath);
newLockFile.write(*outputLockFilePath);
std::optional<std::string> commitMessage = std::nullopt;
if (lockFlags.commitLockFile) {
if (lockFlags.outputLockFilePath) {
throw Error("--commit-lock-file and --output-lock-file are currently incompatible");
@ -679,9 +681,10 @@ LockedFlake lockFlake(
commitMessage = cm;
}
topRef.input.markChangedFile(
(topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock",
commitMessage);
topRef.input.putFile(
CanonPath((topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock"),
newLockFileS, commitMessage);
}
/* Rewriting the lockfile changed the top-level
repo, so we should re-read it. FIXME: we could

1
src/libfetchers/cache.hh
View file

@ -2,6 +2,7 @@
///@file
#include "fetchers.hh"
#include "path.hh"
namespace nix::fetchers {

17
src/libfetchers/fetchers.cc
View file

@ -200,12 +200,13 @@ std::optional<Path> Input::getSourcePath() const
return scheme->getSourcePath(*this);
}
void Input::markChangedFile(
std::string_view file,
void Input::putFile(
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const
{
assert(scheme);
return scheme->markChangedFile(*this, file, commitMsg);
return scheme->putFile(*this, path, contents, commitMsg);
}
std::string Input::getName() const
@ -295,14 +296,18 @@ Input InputScheme::applyOverrides(
return input;
}
std::optional<Path> InputScheme::getSourcePath(const Input & input)
std::optional<Path> InputScheme::getSourcePath(const Input & input) const
{
return {};
}
void InputScheme::markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg)
void InputScheme::putFile(
const Input & input,
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const
{
assert(false);
throw Error("input '%s' does not support modifying file '%s'", input.to_string(), path);
}
void InputScheme::clone(const Input & input, const Path & destDir) const

20
src/libfetchers/fetchers.hh
View file

@ -3,13 +3,14 @@
#include "types.hh"
#include "hash.hh"
#include "canon-path.hh"
#include "path.hh"
#include "attrs.hh"
#include "url.hh"
#include <memory>
namespace nix { class Store; }
namespace nix { class Store; class StorePath; }
namespace nix::fetchers {
@ -97,8 +98,13 @@ public:
std::optional<Path> getSourcePath() const;
void markChangedFile(
std::string_view file,
/**
* Write a file to this input, for input types that support
* writing. Optionally commit the change (for e.g. Git inputs).
*/
void putFile(
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const;
std::string getName() const;
@ -144,9 +150,13 @@ struct InputScheme
virtual void clone(const Input & input, const Path & destDir) const;
virtual std::optional<Path> getSourcePath(const Input & input);
virtual std::optional<Path> getSourcePath(const Input & input) const;
virtual void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg);
virtual void putFile(
const Input & input,
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const;
virtual std::pair<StorePath, Input> fetch(ref<Store> store, const Input & input) = 0;
};

22
src/libfetchers/git.cc
View file

@ -363,7 +363,7 @@ struct GitInputScheme : InputScheme
runProgram("git", true, args, {}, true);
}
std::optional<Path> getSourcePath(const Input & input) override
std::optional<Path> getSourcePath(const Input & input) const override
{
auto url = parseURL(getStrAttr(input.attrs, "url"));
if (url.scheme == "file" && !input.getRef() && !input.getRev())
@ -371,22 +371,30 @@ struct GitInputScheme : InputScheme
return {};
}
void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg) override
void putFile(
const Input & input,
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const override
{
auto sourcePath = getSourcePath(input);
assert(sourcePath);
auto root = getSourcePath(input);
if (!root)
throw Error("cannot commit '%s' to Git repository '%s' because it's not a working tree", path, input.to_string());
writeFile((CanonPath(*root) + path).abs(), contents);
auto gitDir = ".git";
auto result = runProgram(RunOptions {
.program = "git",
.args = {"-C", *sourcePath, "--git-dir", gitDir, "check-ignore", "--quiet", std::string(file)},
.args = {"-C", *root, "--git-dir", gitDir, "check-ignore", "--quiet", std::string(path.rel())},
});
auto exitCode = WEXITSTATUS(result.first);
if (exitCode != 0) {
// The path is not `.gitignore`d, we can add the file.
runProgram("git", true,
{ "-C", *sourcePath, "--git-dir", gitDir, "add", "--intent-to-add", "--", std::string(file) });
{ "-C", *root, "--git-dir", gitDir, "add", "--intent-to-add", "--", std::string(path.rel()) });
if (commitMsg) {
@ -394,7 +402,7 @@ struct GitInputScheme : InputScheme
logger->pause();
Finally restoreLogger([]() { logger->resume(); });
runProgram("git", true,
{ "-C", *sourcePath, "--git-dir", gitDir, "commit", std::string(file), "-m", *commitMsg });
{ "-C", *root, "--git-dir", gitDir, "commit", std::string(path.rel()), "-m", *commitMsg });
}
}
}

1
src/libfetchers/indirect.cc
View file

@ -1,5 +1,6 @@
#include "fetchers.hh"
#include "url-parts.hh"
#include "path.hh"
namespace nix::fetchers {

21
src/libfetchers/mercurial.cc
View file

@ -116,7 +116,7 @@ struct MercurialInputScheme : InputScheme
return res;
}
std::optional<Path> getSourcePath(const Input & input) override
std::optional<Path> getSourcePath(const Input & input) const override
{
auto url = parseURL(getStrAttr(input.attrs, "url"));
if (url.scheme == "file" && !input.getRef() && !input.getRev())
@ -124,18 +124,27 @@ struct MercurialInputScheme : InputScheme
return {};
}
void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg) override
void putFile(
const Input & input,
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const override
{
auto sourcePath = getSourcePath(input);
assert(sourcePath);
auto [isLocal, repoPath] = getActualUrl(input);
if (!isLocal)
throw Error("cannot commit '%s' to Mercurial repository '%s' because it's not a working tree", path, input.to_string());
auto absPath = CanonPath(repoPath) + path;
writeFile(absPath.abs(), contents);
// FIXME: shut up if file is already tracked.
runHg(
{ "add", *sourcePath + "/" + std::string(file) });
{ "add", absPath.abs() });
if (commitMsg)
runHg(
{ "commit", *sourcePath + "/" + std::string(file), "-m", *commitMsg });
{ "commit", absPath.abs(), "-m", *commitMsg });
}
std::pair<bool, std::string> getActualUrl(const Input & input) const

20
src/libfetchers/path.cc
View file

@ -71,14 +71,28 @@ struct PathInputScheme : InputScheme
return true;
}
std::optional<Path> getSourcePath(const Input & input) override
std::optional<Path> getSourcePath(const Input & input) const override
{
return getStrAttr(input.attrs, "path");
}
void markChangedFile(const Input & input, std::string_view file, std::optional<std::string> commitMsg) override
void putFile(
const Input & input,
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const override
{
// nothing to do
writeFile((CanonPath(getAbsPath(input)) + path).abs(), contents);
}
CanonPath getAbsPath(const Input & input) const
{
auto path = getStrAttr(input.attrs, "path");
if (path[0] == '/')
return CanonPath(path);
throw Error("cannot fetch input '%s' because it uses a relative path", input.to_string());
}
std::pair<StorePath, Input> fetch(ref<Store> store, const Input & _input) override