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50 lines
2.8 KiB
JavaScript
50 lines
2.8 KiB
JavaScript
// Why this module exists: `out/electron-dev` accumulates one ~270MB copy of Electron.app per
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// (branch title x Electron version x bundle layout). The runner only ever clears the directory it is
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// about to rebuild, so siblings from renamed branches and past upgrades are never reclaimed --
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// measured at 143 directories / 38GB across one developer's worktrees.
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// Measured from BUILD START, not from last activity: a directory's mtime only changes when a
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// top-level entry is created, so it freezes once `<app>.app` appears and the 276MB copy, helper
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// compiles and signing that follow never refresh it. So this is a hard cliff -- a build still
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// running after this long becomes eligible for deletion by a concurrent instance. Full builds
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// measured at 130-200s, so the margin is 5-10x.
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export const IN_PROGRESS_WINDOW_MS = 15 * 60 * 1000
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/**
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* Which cached bundle directories are safe to reclaim.
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*
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* Three things are protected, and every one of them is a directory some other process still needs:
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*
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* - the bundle this run is about to use;
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* - a bundle a live dev instance is running from. Deleting it can crash that instance mid-session,
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* and developers routinely run several at once;
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* - a bundle still being copied. Between `mkdirSync` and the marker write it exists, has no marker,
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* and cannot appear in the process table because its instance has not launched yet -- so a
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* concurrently starting instance would otherwise delete it mid-copy.
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*
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* `processTable` is raw `ps` output, searched for each candidate rather than parsed into paths.
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* Parsing was tried twice and failed twice in the same dangerous direction -- a regex that missed a
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* live process yielded "nothing is running" and deleted its bundle. Searching for a known absolute
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* directory is immune to spaces and shell-significant characters in the path, and the trailing
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* slash keeps `<dir>2` from being mistaken for `<dir>`.
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*/
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export function isDevBundleInUse(dir, processTable) {
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// Both spellings: macOS realpaths /tmp to /private/tmp, and `ps` preserves whatever spelling the
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// process was launched with. A mismatch would read as "not running" and delete a live bundle.
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// Checking both can only ever protect more, which is the safe direction.
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const alternate = dir.startsWith('/private/') ? dir.slice('/private'.length) : `/private${dir}`
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return processTable.includes(`${dir}/`) || processTable.includes(`${alternate}/`)
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}
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export function selectStaleDevBundleDirs({ bundles, currentDir, processTable, nowMs }) {
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return bundles
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.filter(({ dir, hasMarker, mtimeMs }) => {
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if (dir === currentDir || isDevBundleInUse(dir, processTable)) {
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return false
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}
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const buildInFlight = !hasMarker && nowMs - mtimeMs < IN_PROGRESS_WINDOW_MS
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return !buildInFlight
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})
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.map(({ dir }) => dir)
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}
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