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#6542 Apply flake templates partially on conflicts

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Will still exit with non-zero exit code and clearly prompt which files to merge:
 ```
nixx flake init -t github:numtide/devshell
wrote: /home/manu/dev/stuff/gopassbridge/.envrc
refusing to overwrite existing file '/home/manu/dev/stuff/gopassbridge/.gitignore'
-> merge manually with '/nix/store/ksmwhyghjwb4d9dw6hcpbvng1msdvjim-source/template/.gitignore'
wrote: /home/manu/dev/stuff/gopassbridge/devshell.toml
wrote: /home/manu/dev/stuff/gopassbridge/flake.nix
error: Encountered 1 conflicts - please merge manually
 ```
This commit is contained in:
Manu [tennox] 2022-06-21 17:26:32 +01:00
parent 452ffe5464
commit 3a85fd077c
1 changed files with 23 additions and 7 deletions
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30
src/nix/flake.cc
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@ -740,7 +740,9 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
"If you've set '%s' to a string, try using a path instead.", "If you've set '%s' to a string, try using a path instead.",
templateDir, templateDirAttr->getAttrPathStr()); templateDir, templateDirAttr->getAttrPathStr());
std::vector<Path> files; std::vector<Path> changedFiles;
std::vector<Path> conflictedFiles;
auto success = false;
std::function<void(const Path & from, const Path & to)> copyDir; std::function<void(const Path & from, const Path & to)> copyDir;
copyDir = [&](const Path & from, const Path & to) copyDir = [&](const Path & from, const Path & to)
@ -757,22 +759,33 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
auto contents = readFile(from2); auto contents = readFile(from2);
if (pathExists(to2)) { if (pathExists(to2)) {
auto contents2 = readFile(to2); auto contents2 = readFile(to2);
if (contents != contents2) if (contents != contents2) {
throw Error("refusing to overwrite existing file '%s' - please merge manually with '%s'", to2, from2); printError("refusing to overwrite existing file '%s'\n-> merge manually with '%s'", to2, from2);
success = false;
conflictedFiles.push_back(to2);
} else {
notice("skipping identical file: %s", from2);
}
continue;
} else } else
writeFile(to2, contents); writeFile(to2, contents);
} }
else if (S_ISLNK(st.st_mode)) { else if (S_ISLNK(st.st_mode)) {
auto target = readLink(from2); auto target = readLink(from2);
if (pathExists(to2)) { if (pathExists(to2)) {
if (readLink(to2) != target) if (readLink(to2) != target) {
throw Error("refusing to overwrite existing symlink '%s' - please merge manually with '%s'", to2, from2); printError("refusing to overwrite existing file '%s' - please merge manually with '%s'", to2, from2);
success = false;
conflictedFiles.push_back(to2);
} else {
notice("skipping identical file: %s", from2);
}
} else } else
createSymlink(target, to2); createSymlink(target, to2);
} }
else else
throw Error("file '%s' has unsupported type", from2); throw Error("file '%s' has unsupported type", from2);
files.push_back(to2); changedFiles.push_back(to2);
notice("wrote: %s", to2); notice("wrote: %s", to2);
} }
}; };
@ -781,7 +794,7 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
if (pathExists(flakeDir + "/.git")) { if (pathExists(flakeDir + "/.git")) {
Strings args = { "-C", flakeDir, "add", "--intent-to-add", "--force", "--" }; Strings args = { "-C", flakeDir, "add", "--intent-to-add", "--force", "--" };
for (auto & s : files) args.push_back(s); for (auto & s : changedFiles) args.push_back(s);
runProgram("git", true, args); runProgram("git", true, args);
} }
auto welcomeText = cursor->maybeGetAttr("welcomeText"); auto welcomeText = cursor->maybeGetAttr("welcomeText");
@ -789,6 +802,9 @@ struct CmdFlakeInitCommon : virtual Args, EvalCommand
notice("\n"); notice("\n");
notice(renderMarkdownToTerminal(welcomeText->getString())); notice(renderMarkdownToTerminal(welcomeText->getString()));
} }
if (!success)
throw Error("Encountered %d conflicts - please merge manually", conflictedFiles.size());
} }
}; };