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tdurieux
f0f6436370
Files tracked by Git LFS used to come out as the pointer text:
version https://git-lfs.github.com/spec/v1
oid sha256:...
size ...
…because GitHub's blob API returns the pointer, not the resolved
content. Detect that prefix on the first ~150 bytes of the blob stream
and switch to a fresh fetch via the web raw URL
(github.com/<owner>/<repo>/raw/<commit>/<path>), which auto-redirects
to media.githubusercontent.com and resolves the LFS object — auth
header carries through. Non-LFS files are forwarded through the
existing pipeline unchanged.
Fixes #95.
43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
const { expect } = require("chai");
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const { Readable } = require("stream");
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// Standalone test of the LFS-pointer detection shape used in
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// GitHubStream#resolveLfsPointer. We can't easily import that method (it's
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// private and the file pulls in heavy GitHub plumbing), so this mirrors the
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// detection logic to confirm the head-bytes check.
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const LFS_PREFIX = "version https://git-lfs.github.com/spec/";
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function isLfsPointer(buf) {
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return (
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buf.length >= LFS_PREFIX.length &&
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buf.toString("utf8", 0, LFS_PREFIX.length) === LFS_PREFIX
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);
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}
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describe("LFS pointer detection (#95)", function () {
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it("recognizes the standard pointer prefix", function () {
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const pointer = Buffer.from(
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"version https://git-lfs.github.com/spec/v1\n" +
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"oid sha256:abc123\nsize 12345\n"
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);
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expect(isLfsPointer(pointer)).to.equal(true);
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});
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it("doesn't false-positive on plain text starting with 'version'", function () {
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const fake = Buffer.from(
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"version 1.2.3\nA short release notes file mentioning git-lfs.\n"
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);
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expect(isLfsPointer(fake)).to.equal(false);
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});
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it("doesn't false-positive on binary headers", function () {
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const elf = Buffer.from([0x7f, 0x45, 0x4c, 0x46, ...new Array(100).fill(0)]);
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expect(isLfsPointer(elf)).to.equal(false);
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});
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it("handles short streams below the prefix length", function () {
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expect(isLfsPointer(Buffer.from("vers"))).to.equal(false);
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});
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});
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