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Add link/linkSync fs call for hardlinks (denoland#2074)
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license. | ||
import * as msg from "gen/cli/msg_generated"; | ||
import * as flatbuffers from "./flatbuffers"; | ||
import * as dispatch from "./dispatch"; | ||
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function req( | ||
oldname: string, | ||
newname: string | ||
): [flatbuffers.Builder, msg.Any, flatbuffers.Offset] { | ||
const builder = flatbuffers.createBuilder(); | ||
const oldname_ = builder.createString(oldname); | ||
const newname_ = builder.createString(newname); | ||
const inner = msg.Link.createLink(builder, oldname_, newname_); | ||
return [builder, msg.Any.Link, inner]; | ||
} | ||
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/** Synchronously creates `newname` as a hard link to `oldname`. | ||
* | ||
* Deno.linkSync("old/name", "new/name"); | ||
*/ | ||
export function linkSync(oldname: string, newname: string): void { | ||
dispatch.sendSync(...req(oldname, newname)); | ||
} | ||
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/** Creates `newname` as a hard link to `oldname`. | ||
* | ||
* await Deno.link("old/name", "new/name"); | ||
*/ | ||
export async function link(oldname: string, newname: string): Promise<void> { | ||
await dispatch.sendAsync(...req(oldname, newname)); | ||
} |
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license. | ||
import { test, testPerm, assert, assertEquals } from "./test_util.ts"; | ||
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testPerm({ read: true, write: true }, function linkSyncSuccess() { | ||
const testDir = Deno.makeTempDirSync(); | ||
const oldData = "Hardlink"; | ||
const oldName = testDir + "/oldname"; | ||
const newName = testDir + "/newname"; | ||
Deno.writeFileSync(oldName, new TextEncoder().encode(oldData)); | ||
// Create the hard link. | ||
Deno.linkSync(oldName, newName); | ||
// We should expect reading the same content. | ||
const newData = new TextDecoder().decode(Deno.readFileSync(newName)); | ||
assertEquals(oldData, newData); | ||
// Writing to newname also affects oldname. | ||
const newData2 = "Modified"; | ||
Deno.writeFileSync(newName, new TextEncoder().encode(newData2)); | ||
assertEquals(newData2, new TextDecoder().decode(Deno.readFileSync(oldName))); | ||
// Writing to oldname also affects newname. | ||
const newData3 = "ModifiedAgain"; | ||
Deno.writeFileSync(oldName, new TextEncoder().encode(newData3)); | ||
assertEquals(newData3, new TextDecoder().decode(Deno.readFileSync(newName))); | ||
// Remove oldname. File still accessible through newname. | ||
Deno.removeSync(oldName); | ||
const newNameStat = Deno.statSync(newName); | ||
assert(newNameStat.isFile()); | ||
assert(!newNameStat.isSymlink()); // Not a symlink. | ||
assertEquals(newData3, new TextDecoder().decode(Deno.readFileSync(newName))); | ||
}); | ||
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testPerm({ read: true, write: true }, function linkSyncExists() { | ||
const testDir = Deno.makeTempDirSync(); | ||
const oldName = testDir + "/oldname"; | ||
const newName = testDir + "/newname"; | ||
Deno.writeFileSync(oldName, new TextEncoder().encode("oldName")); | ||
// newname is already created. | ||
Deno.writeFileSync(newName, new TextEncoder().encode("newName")); | ||
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let err; | ||
try { | ||
Deno.linkSync(oldName, newName); | ||
} catch (e) { | ||
err = e; | ||
} | ||
assert(!!err); | ||
console.log(err); | ||
assertEquals(err.kind, Deno.ErrorKind.AlreadyExists); | ||
assertEquals(err.name, "AlreadyExists"); | ||
}); | ||
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testPerm({ read: true, write: true }, function linkSyncNotFound() { | ||
const testDir = Deno.makeTempDirSync(); | ||
const oldName = testDir + "/oldname"; | ||
const newName = testDir + "/newname"; | ||
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let err; | ||
try { | ||
Deno.linkSync(oldName, newName); | ||
} catch (e) { | ||
err = e; | ||
} | ||
assert(!!err); | ||
console.log(err); | ||
assertEquals(err.kind, Deno.ErrorKind.NotFound); | ||
assertEquals(err.name, "NotFound"); | ||
}); | ||
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test(function linkSyncPerm() { | ||
let err; | ||
try { | ||
Deno.linkSync("oldbaddir", "newbaddir"); | ||
} catch (e) { | ||
err = e; | ||
} | ||
assertEquals(err.kind, Deno.ErrorKind.PermissionDenied); | ||
assertEquals(err.name, "PermissionDenied"); | ||
}); | ||
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testPerm({ read: true, write: true }, async function linkSuccess() { | ||
const testDir = Deno.makeTempDirSync(); | ||
const oldData = "Hardlink"; | ||
const oldName = testDir + "/oldname"; | ||
const newName = testDir + "/newname"; | ||
Deno.writeFileSync(oldName, new TextEncoder().encode(oldData)); | ||
// Create the hard link. | ||
await Deno.link(oldName, newName); | ||
// We should expect reading the same content. | ||
const newData = new TextDecoder().decode(Deno.readFileSync(newName)); | ||
assertEquals(oldData, newData); | ||
// Writing to newname also affects oldname. | ||
const newData2 = "Modified"; | ||
Deno.writeFileSync(newName, new TextEncoder().encode(newData2)); | ||
assertEquals(newData2, new TextDecoder().decode(Deno.readFileSync(oldName))); | ||
// Writing to oldname also affects newname. | ||
const newData3 = "ModifiedAgain"; | ||
Deno.writeFileSync(oldName, new TextEncoder().encode(newData3)); | ||
assertEquals(newData3, new TextDecoder().decode(Deno.readFileSync(newName))); | ||
// Remove oldname. File still accessible through newname. | ||
Deno.removeSync(oldName); | ||
const newNameStat = Deno.statSync(newName); | ||
assert(newNameStat.isFile()); | ||
assert(!newNameStat.isSymlink()); // Not a symlink. | ||
assertEquals(newData3, new TextDecoder().decode(Deno.readFileSync(newName))); | ||
}); |
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