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Add abstract interface for writing files to an Input

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This commit is contained in:
Eelco Dolstra 2022-07-27 14:26:15 +02:00
parent bb4d35dcca
commit f780539406
8 changed files with 102 additions and 84 deletions
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90
src/libexpr/flake/flake.cc
View file

@ -621,65 +621,53 @@ LockedFlake lockFlake(
auto diff = LockFile::diff(oldLockFile, newLockFile);
if (lockFlags.writeLockFile) {
if (auto sourcePath = topRef.input.getAccessor(state.store).first->root().getPhysicalPath()) {
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);
} else {
if (!lockFlags.updateLockFile)
throw Error("flake '%s' requires lock file changes but they're not allowed due to '--no-update-lock-file'", topRef);
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);
} else {
if (!lockFlags.updateLockFile)
throw Error("flake '%s' requires lock file changes but they're not allowed due to '--no-update-lock-file'", topRef);
CanonPath flakeDir(*sourcePath);
auto path = flake->path.parent() + "flake.lock";
auto relPath = flakeDir + "flake.lock";
bool lockFileExists = path.pathExists();
auto path = flakeDir + "flake.lock";
if (lockFileExists) {
auto s = chomp(diff);
if (s.empty())
warn("updating lock file '%s'", path);
else
warn("updating lock file '%s':\n%s", path, s);
} else
warn("creating lock file '%s'", path);
bool lockFileExists = pathExists(path.abs());
std::optional<std::string> commitMessage = std::nullopt;
if (lockFlags.commitLockFile) {
std::string cm;
if (lockFileExists) {
auto s = chomp(diff);
if (s.empty())
warn("updating lock file '%s'", path);
else
warn("updating lock file '%s':\n%s", path, s);
} else
warn("creating lock file '%s'", path);
cm = fetchSettings.commitLockFileSummary.get();
newLockFile.write(path.abs());
if (cm == "")
cm = fmt("%s: %s", path.path.rel(), lockFileExists ? "Update" : "Add");
std::optional<std::string> commitMessage = std::nullopt;
if (lockFlags.commitLockFile) {
std::string cm;
cm = fetchSettings.commitLockFileSummary.get();
if (cm == "") {
cm = fmt("%s: %s", relPath, lockFileExists ? "Update" : "Add");
}
cm += "\n\nFlake lock file updates:\n\n";
cm += filterANSIEscapes(diff, true);
commitMessage = cm;
}
topRef.input.markChangedFile(
(topRef.subdir == "" ? "" : topRef.subdir + "/") + "flake.lock",
commitMessage);
/* Rewriting the lockfile changed the top-level
repo, so we should re-read it. FIXME: we could
also just clear the 'rev' field... */
auto prevLockedRef = flake->lockedRef;
flake = std::make_unique<Flake>(getFlake(state, topRef, useRegistries));
if (lockFlags.commitLockFile &&
flake->lockedRef.input.getRev() &&
prevLockedRef.input.getRev() != flake->lockedRef.input.getRev())
warn("committed new revision '%s'", flake->lockedRef.input.getRev()->gitRev());
cm += "\n\nFlake lock file updates:\n\n";
cm += filterANSIEscapes(diff, true);
commitMessage = cm;
}
} else
throw Error("cannot write modified lock file of flake '%s' (use '--no-write-lock-file' to ignore)", topRef);
topRef.input.putFile(path.path, fmt("%s\n", newLockFile), commitMessage);
/* Rewriting the lockfile changed the top-level
repo, so we should re-read it. FIXME: we could
also just clear the 'rev' field... */
auto prevLockedRef = flake->lockedRef;
flake = std::make_unique<Flake>(getFlake(state, topRef, useRegistries));
if (lockFlags.commitLockFile &&
flake->lockedRef.input.getRev() &&
prevLockedRef.input.getRev() != flake->lockedRef.input.getRev())
warn("committed new revision '%s'", flake->lockedRef.input.getRev()->gitRev());
}
} else {
warn("not writing modified lock file of flake '%s':\n%s", topRef, chomp(diff));
flake->forceDirty = true;

6
src/libexpr/flake/lockfile.cc
View file

@ -190,12 +190,6 @@ std::ostream & operator <<(std::ostream & stream, const LockFile & lockFile)
return stream;
}
void LockFile::write(const Path & path) const
{
createDirs(dirOf(path));
writeFile(path, fmt("%s\n", *this));
}
std::optional<FlakeRef> LockFile::isUnlocked() const
{
std::unordered_set<std::shared_ptr<const Node>> nodes;

4
src/libexpr/flake/lockfile.hh
View file

@ -59,10 +59,6 @@ struct LockFile
std::string to_string() const;
static LockFile read(const Path & path);
void write(const Path & path) const;
/* Check whether this lock file has any unlocked inputs. If so,
return one. */
std::optional<FlakeRef> isUnlocked() const;

15
src/libfetchers/fetchers.cc
View file

@ -187,12 +187,13 @@ void Input::clone(const Path & destDir) const
scheme->clone(*this, destDir);
}
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
@ -278,9 +279,13 @@ Input InputScheme::applyOverrides(
return input;
}
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)

11
src/libfetchers/fetchers.hh
View file

@ -79,8 +79,9 @@ public:
void clone(const Path & destDir) const;
void markChangedFile(
std::string_view file,
void putFile(
const CanonPath & path,
std::string_view contents,
std::optional<std::string> commitMsg) const;
std::string getName() const;
@ -130,7 +131,11 @@ struct InputScheme
virtual void clone(const Input & input, const Path & destDir);
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;
/* Note: the default implementations of fetchToStore() and
getAccessor() are defined using the other, so implementations

21
src/libfetchers/git.cc
View file

@ -245,17 +245,28 @@ struct GitInputScheme : InputScheme
runProgram("git", true, args);
}
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
{
auto repoInfo = getRepoInfo(input);
assert(repoInfo.isLocal);
if (!repoInfo.isLocal)
throw Error("cannot commit '%s' to Git repository '%s' because it's not a working tree", path, input.to_string());
auto absPath = CanonPath(repoInfo.url) + path;
// FIXME: make sure that absPath is not a symlink that escapes
// the repo.
writeFile(absPath.abs(), contents);
runProgram("git", true,
{ "-C", repoInfo.url, "--git-dir", repoInfo.gitDir, "add", "--force", "--intent-to-add", "--", std::string(file) });
{ "-C", repoInfo.url, "--git-dir", repoInfo.gitDir, "add", "--force", "--intent-to-add", "--", std::string(path.rel()) });
if (commitMsg)
runProgram("git", true,
{ "-C", repoInfo.url, "--git-dir", repoInfo.gitDir, "commit", std::string(file), "-m", *commitMsg });
{ "-C", repoInfo.url, "--git-dir", repoInfo.gitDir, "commit", std::string(path.rel()), "-m", *commitMsg });
}
struct RepoInfo
@ -292,7 +303,7 @@ struct GitInputScheme : InputScheme
std::string gitDir = ".git";
};
RepoInfo getRepoInfo(const Input & input)
RepoInfo getRepoInfo(const Input & input) const
{
auto checkHashType = [&](const std::optional<Hash> & hash)
{

21
src/libfetchers/mercurial.cc
View file

@ -116,18 +116,29 @@ struct MercurialInputScheme : InputScheme
return res;
}
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
{
auto [isLocal, path] = getActualUrl(input);
assert(isLocal);
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;
// FIXME: make sure that absPath is not a symlink that escapes
// the repo.
writeFile(absPath.abs(), contents);
// FIXME: shut up if file is already tracked.
runHg(
{ "add", path + "/" + file });
{ "add", absPath.abs() });
if (commitMsg)
runHg(
{ "commit", path + "/" + file, "-m", *commitMsg });
{ "commit", absPath.abs(), "-m", *commitMsg });
}
std::pair<bool, std::string> getActualUrl(const Input & input) const

18
src/libfetchers/path.cc
View file

@ -80,12 +80,20 @@ struct PathInputScheme : InputScheme
return true;
}
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
{
// nothing to do
auto absPath = CanonPath(getAbsPath(input)) + path;
// FIXME: make sure that absPath is not a symlink that escapes
// the repo.
writeFile(absPath.abs(), contents);
}
CanonPath getAbsPath(ref<Store> store, const Input & input) const
CanonPath getAbsPath(const Input & input) const
{
auto path = getStrAttr(input.attrs, "path");
@ -97,7 +105,7 @@ struct PathInputScheme : InputScheme
std::pair<ref<InputAccessor>, Input> getAccessor(ref<Store> store, const Input & input) override
{
auto absPath = getAbsPath(store, input);
auto absPath = getAbsPath(input);
auto input2(input);
input2.attrs.emplace("path", (std::string) absPath.abs());
return {makeFSInputAccessor(absPath), std::move(input2)};
@ -109,7 +117,7 @@ struct PathInputScheme : InputScheme
locked, so just use the path as its fingerprint. Maybe we
should restrict this to CA paths but that's not
super-important. */
auto path = getAbsPath(store, input);
auto path = getAbsPath(input);
if (store->isInStore(path.abs()))
return path.abs();
return std::nullopt;