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import * as os from "os";
import * as core from "@actions/core";
import { ExecOptions } from "@actions/exec";
import * as toolrunner from "@actions/exec/lib/toolrunner";
import * as io from "@actions/io";
import * as semver from "semver";
import {
getOptionalInput,
getWorkflowEvent,
getWorkflowEventName,
} from "./actions-util";
import { ConfigurationError, getRequiredEnvParam } from "./util";
/**
* Minimum Git version required for overlay analysis. The `git ls-files --format`
* option, which is used by `getFileOidsUnderPath`, was introduced in Git 2.38.0.
*/
export const GIT_MINIMUM_VERSION_FOR_OVERLAY = "2.38.0";
/**
* Git version information
*
* The full version string as reported by `git --version` may not be
* semver-compatible (e.g., "2.40.0.windows.1"). This class captures both
* the full version string and a truncated semver-compatible version string
* (e.g., "2.40.0").
*/
export class GitVersionInfo {
constructor(
/** Truncated semver-compatible version */
public truncatedVersion: string,
/** Full version string as reported by `git --version` */
public fullVersion: string,
) {}
isAtLeast(minVersion: string): boolean {
return semver.gte(this.truncatedVersion, minVersion);
}
}
/**
* Gets the version of Git installed on the system and throws an error if
* the version cannot be determined.
*/
export async function getGitVersionOrThrow(): Promise<GitVersionInfo> {
const stdout = await runGitCommand(
undefined,
["--version"],
"Failed to get git version.",
);
// Git version output can vary: "git version 2.40.0" or "git version 2.40.0.windows.1"
// We capture just the major.minor.patch portion to ensure semver compatibility.
const match = stdout.trim().match(/^git version ((\d+\.\d+\.\d+).*)$/);
if (match?.[1] && match?.[2]) {
return new GitVersionInfo(match[2], match[1]);
}
throw new Error(`Could not parse Git version from output: ${stdout.trim()}`);
}
export const runGitCommand = async function (
workingDirectory: string | undefined,
args: string[],
customErrorMessage: string,
options?: ExecOptions,
): Promise<string> {
let stdout = "";
let stderr = "";
core.debug(`Running git command: git ${args.join(" ")}`);
try {
await new toolrunner.ToolRunner(await io.which("git", true), args, {
silent: true,
listeners: {
stdout: (data) => {
stdout += data.toString();
},
stderr: (data) => {
stderr += data.toString();
},
},
cwd: workingDirectory,
...options,
}).exec();
return stdout;
} catch (error) {
let reason = stderr;
if (stderr.includes("not a git repository")) {
reason =
"The checkout path provided to the action does not appear to be a git repository.";
}
core.info(`git call failed. ${customErrorMessage} Error: ${reason}`);
throw error;
}
};
/**
* Gets the SHA of the commit that is currently checked out.
*/
export const getCommitOid = async function (
checkoutPath: string,
ref = "HEAD",
): Promise<string> {
// Try to use git to get the current commit SHA. If that fails then
// log but otherwise silently fall back to using the SHA from the environment.
// The only time these two values will differ is during analysis of a PR when
// the workflow has changed the current commit to the head commit instead of
// the merge commit, which must mean that git is available.
// Even if this does go wrong, it's not a huge problem for the alerts to
// reported on the merge commit.
try {
const stdout = await runGitCommand(
checkoutPath,
["rev-parse", ref],
"Continuing with commit SHA from user input or environment.",
);
return stdout.trim();
} catch {
return getOptionalInput("sha") || getRequiredEnvParam("GITHUB_SHA");
}
};
/**
* If the action was triggered by a pull request, determine the commit sha at
* the head of the base branch, using the merge commit that this workflow analyzes.
* Returns undefined if run by other triggers or the base branch commit cannot be
* determined.
*/
export const determineBaseBranchHeadCommitOid = async function (
checkoutPathOverride?: string,
): Promise<string | undefined> {
if (getWorkflowEventName() !== "pull_request") {
return undefined;
}
const mergeSha = getRequiredEnvParam("GITHUB_SHA");
const checkoutPath =
checkoutPathOverride ?? getOptionalInput("checkout_path");
try {
let commitOid = "";
let baseOid = "";
let headOid = "";
const stdout = await runGitCommand(
checkoutPath,
["show", "-s", "--format=raw", mergeSha],
"Will calculate the base branch SHA on the server.",
);
for (const data of stdout.split("\n")) {
if (data.startsWith("commit ") && commitOid === "") {
commitOid = data.substring(7);
} else if (data.startsWith("parent ")) {
if (baseOid === "") {
baseOid = data.substring(7);
} else if (headOid === "") {
headOid = data.substring(7);
}
}
}
// Let's confirm our assumptions: We had a merge commit and the parsed parent data looks correct
if (
commitOid === mergeSha &&
headOid.length === 40 &&
baseOid.length === 40
) {
return baseOid;
}
return undefined;
} catch {
return undefined;
}
};
/**
* Decode, if necessary, a file path produced by Git. See
* https://git-scm.com/docs/git-config#Documentation/git-config.txt-corequotePath
* for details on how Git encodes file paths with special characters.
*
* This function works only for Git output with `core.quotePath=false`.
*/
export const decodeGitFilePath = function (filePath: string): string {
if (filePath.startsWith('"') && filePath.endsWith('"')) {
filePath = filePath.substring(1, filePath.length - 1);
return filePath.replace(
/\\([abfnrtv\\"]|[0-7]{1,3})/g,
(_match, seq: string) => {
switch (seq[0]) {
case "a":
return "\x07";
case "b":
return "\b";
case "f":
return "\f";
case "n":
return "\n";
case "r":
return "\r";
case "t":
return "\t";
case "v":
return "\v";
case "\\":
return "\\";
case '"':
return '"';
default:
// Both String.fromCharCode() and String.fromCodePoint() works only
// for constructing an entire character at once. If a Unicode
// character is encoded as a sequence of escaped bytes, calling these
// methods sequentially on the individual byte values would *not*
// produce the original multi-byte Unicode character. As a result,
// this implementation works only with the Git option core.quotePath
// set to false.
return String.fromCharCode(parseInt(seq, 8));
}
},
);
}
return filePath;
};
/**
* Get the root of the Git repository.
*
* @param sourceRoot The source root of the code being analyzed.
* @returns The root of the Git repository.
*/
export const getGitRoot = async function (
sourceRoot: string,
): Promise<string | undefined> {
try {
const stdout = await runGitCommand(
sourceRoot,
["rev-parse", "--show-toplevel"],
`Cannot find Git repository root from the source root ${sourceRoot}.`,
);
return stdout.trim();
} catch {
// Errors are already logged by runGitCommand()
return undefined;
}
};
/**
* Returns the Git OIDs of all tracked files (in the index and in the working
* tree) that are under the given base path, including files in active
* submodules. Untracked files and files not under the given base path are
* ignored.
*
* @param basePath A path into the Git repository.
* @returns a map from file paths (relative to `basePath`) to Git OIDs.
* @throws {Error} if "git ls-tree" produces unexpected output.
*/
export const getFileOidsUnderPath = async function (
basePath: string,
): Promise<{ [key: string]: string }> {
// Without the --full-name flag, the path is relative to the current working
// directory of the git command, which is basePath.
const stdout = await runGitCommand(
basePath,
["ls-files", "--recurse-submodules", "--format=%(objectname)_%(path)"],
"Cannot list Git OIDs of tracked files.",
);
const fileOidMap: { [key: string]: string } = {};
// With --format=%(objectname)_%(path), the output is a list of lines like:
// 30d998ded095371488be3a729eb61d86ed721a18_lib/git-utils.js
// d89514599a9a99f22b4085766d40af7b99974827_lib/git-utils.js.map
const regex = /^([0-9a-f]{40})_(.+)$/;
for (const line of stdout.split("\n")) {
if (line) {
const match = line.match(regex);
if (match) {
const oid = match[1];
const path = decodeGitFilePath(match[2]);
fileOidMap[path] = oid;
} else {
throw new Error(`Unexpected "git ls-files" output: ${line}`);
}
}
}
return fileOidMap;
};
function getRefFromEnv(): string {
// To workaround a limitation of Actions dynamic workflows not setting
// the GITHUB_REF in some cases, we accept also the ref within the
// CODE_SCANNING_REF variable. When possible, however, we prefer to use
// the GITHUB_REF as that is a protected variable and cannot be overwritten.
let refEnv: string;
try {
refEnv = getRequiredEnvParam("GITHUB_REF");
} catch (e) {
// If the GITHUB_REF is not set, we try to rescue by getting the
// CODE_SCANNING_REF.
const maybeRef = process.env["CODE_SCANNING_REF"];
if (maybeRef === undefined || maybeRef.length === 0) {
throw e;
}
refEnv = maybeRef;
}
return refEnv;
}
/**
* Get the ref currently being analyzed.
*/
export async function getRef(): Promise<string> {
// Will be in the form "refs/heads/master" on a push event
// or in the form "refs/pull/N/merge" on a pull_request event
const refInput = getOptionalInput("ref");
const shaInput = getOptionalInput("sha");
const checkoutPath =
getOptionalInput("checkout_path") ||
getOptionalInput("source-root") ||
getRequiredEnvParam("GITHUB_WORKSPACE");
const hasRefInput = !!refInput;
const hasShaInput = !!shaInput;
// If one of 'ref' or 'sha' are provided, both are required
if ((hasRefInput || hasShaInput) && !(hasRefInput && hasShaInput)) {
throw new ConfigurationError(
"Both 'ref' and 'sha' are required if one of them is provided.",
);
}
const ref = refInput || getRefFromEnv();
const sha = shaInput || getRequiredEnvParam("GITHUB_SHA");
// If the ref is a user-provided input, we have to skip logic
// and assume that it is really where they want to upload the results.
if (refInput) {
return refInput;
}
// For pull request refs we want to detect whether the workflow
// has run `git checkout HEAD^2` to analyze the 'head' ref rather
// than the 'merge' ref. If so, we want to convert the ref that
// we report back.
const pull_ref_regex = /refs\/pull\/(\d+)\/merge/;
if (!pull_ref_regex.test(ref)) {
return ref;
}
const head = await getCommitOid(checkoutPath, "HEAD");
// in actions/checkout@v2+ we can check if git rev-parse HEAD == GITHUB_SHA
// in actions/checkout@v1 this may not be true as it checks out the repository
// using GITHUB_REF. There is a subtle race condition where
// git rev-parse GITHUB_REF != GITHUB_SHA, so we must check
// git rev-parse GITHUB_REF == git rev-parse HEAD instead.
const hasChangedRef =
sha !== head &&
(await getCommitOid(
checkoutPath,
ref.replace(/^refs\/pull\//, "refs/remotes/pull/"),
)) !== head;
if (hasChangedRef) {
const newRef = ref.replace(pull_ref_regex, "refs/pull/$1/head");
core.debug(
`No longer on merge commit, rewriting ref from ${ref} to ${newRef}.`,
);
return newRef;
} else {
return ref;
}
}
function removeRefsHeadsPrefix(ref: string): string {
return ref.startsWith("refs/heads/") ? ref.slice("refs/heads/".length) : ref;
}
/**
* Returns whether we are analyzing the default branch for the repository.
*
* This first checks the environment variable `CODE_SCANNING_IS_ANALYZING_DEFAULT_BRANCH`. This
* environment variable can be set in cases where repository information might not be available, for
* example dynamic workflows.
*/
export async function isAnalyzingDefaultBranch(): Promise<boolean> {
if (process.env.CODE_SCANNING_IS_ANALYZING_DEFAULT_BRANCH === "true") {
return true;
}
// Get the current ref and trim and refs/heads/ prefix
let currentRef = await getRef();
currentRef = removeRefsHeadsPrefix(currentRef);
const event = getWorkflowEvent();
let defaultBranch = event?.repository?.default_branch;
if (getWorkflowEventName() === "schedule") {
defaultBranch = removeRefsHeadsPrefix(getRefFromEnv());
}
return currentRef === defaultBranch;
}
/**
* Gets a list of all tracked files in the repository.
*
* @param workingDirectory The working directory, which is part of a Git repository.
*/
export async function listFiles(workingDirectory: string): Promise<string[]> {
const stdout = await runGitCommand(
workingDirectory,
["ls-files"],
"Unable to list tracked files.",
);
return stdout.split(os.EOL).filter((line) => line.trim().length > 0);
}
/**
* Gets a list of files that have the `linguist-generated: true` attribute.
*
* @param workingDirectory The working directory, which is part of a Git repository.
*/
export async function getGeneratedFiles(
workingDirectory: string,
): Promise<string[]> {
const files = await listFiles(workingDirectory);
const stdout = await runGitCommand(
workingDirectory,
["check-attr", "linguist-generated", "--stdin"],
"Unable to check attributes of files.",
{ input: Buffer.from(files.join(os.EOL)) },
);
const generatedFiles: string[] = [];
const regex = /^([^:]+): linguist-generated: true$/;
for (const result of stdout.split(os.EOL)) {
const match = result.match(regex);
if (match && match[1].trim().length > 0) {
generatedFiles.push(match[1].trim());
}
}
return generatedFiles;
}