{"action":"opened","number":107,"pull_request":{"url":"https://api.github.com/repos/haraldh/dracut/pulls/107","id":54192264,"html_url":"https://github.com/haraldh/dracut/pull/107","diff_url":"https://github.com/haraldh/dracut/pull/107.diff","patch_url":"https://github.com/haraldh/dracut/pull/107.patch","issue_url":"https://api.github.com/repos/haraldh/dracut/issues/107","number":107,"state":"open","locked":false,"title":"Enable the use of the OverlayFS for the LiveOS root filesystem.","user":{"login":"FGrose","id":4335897,"avatar_url":"https://avatars.githubusercontent.com/u/4335897?v=3","gravatar_id":"","url":"https://api.github.com/users/FGrose","html_url":"https://github.com/FGrose","followers_url":"https://api.github.com/users/FGrose/followers","following_url":"https://api.github.com/users/FGrose/following{/other_user}","gists_url":"https://api.github.com/users/FGrose/gists{/gist_id}","starred_url":"https://api.github.com/users/FGrose/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/FGrose/subscriptions","organizations_url":"https://api.github.com/users/FGrose/orgs","repos_url":"https://api.github.com/users/FGrose/repos","events_url":"https://api.github.com/users/FGrose/events{/privacy}","received_events_url":"https://api.github.com/users/FGrose/received_events","type":"User","site_admin":false},"body":"Integrate the option to use an OverlayFS as the root filesystem\r\ninto the 90dmsquash-live module for testing purposes.\r\n\r\nTested primarily with transient, in-RAM overlay boots on vfat-\r\nformatted Live USB devices, with persistent overlay directories\r\non ext4-formatted Live USB devices, and with embedded, persistent\r\noverlay directories on vfat-formatted devices. (Persistent overlay\r\ndirectories on a vfat-formatted device must be in an embedded\r\nfilesystem that supports the creation of trusted.* extended attributes,\r\nand must provide valid d_type in readdir responses.)  The\r\nrd.live.overlay.readonly option to allow a persistent overlayfs to be\r\nmounted read only through a higher level transient overlay directory\r\nhas been implemented through the multiple lower layers feature of\r\nOverlayFS.\r\n\r\nThis implementation currently requires the enforcing=0 kernel command\r\nline option.  Further SELinux tuning may change this limitation.\r\n\r\nTo permit easier comparison of Device-mapper vs. OverlayFS performance,\r\nthe default transient dm overlay size has been adjusted up to 32 GiB.\r\nA transient dm overlay is a sparse file in memory, so this does not\r\nconsume more RAM for legacy applications.  It does permit a user to\r\nuse all of the available root filesystem storage, and fails gently\r\nwhen it is consumed, as the available free root filesystem storage on\r\na typical LiveOS build is under a few GiB.  Thus, when booted on other-\r\nthan-small RAM systems, the transient dm overlay should not overflow.\r\n\r\nOverlayFS offers the potential to use all of the available free RAM,\r\nor all of the available free disc storage on non-vfat-devices,\r\nin its overlay, even beyond the root filesystem available space,\r\nbecause the OverlayFS root filesystem is a union of directories on\r\ntwo different partitions.","created_at":"2015-12-20T03:43:32Z","updated_at":"2015-12-20T03:43:32Z","closed_at":null,"merged_at":null,"merge_commit_sha":null,"assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/haraldh/dracut/pulls/107/commits","review_comments_url":"https://api.github.com/repos/haraldh/dracut/pulls/107/comments","review_comment_url":"https://api.github.com/repos/haraldh/dracut/pulls/comments{/number}","comments_url":"https://api.github.com/repos/haraldh/dracut/issues/107/comments","statuses_url":"https://api.github.com/repos/haraldh/dracut/statuses/e4a0c816b447ce221664ecaa91d2d984df147abc","head":{"label":"FGrose:overlayfs","ref":"overlayfs","sha":"e4a0c816b447ce221664ecaa91d2d984df147abc","user":{"login":"FGrose","id":4335897,"avatar_url":"https://avatars.githubusercontent.com/u/4335897?v=3","gravatar_id":"","url":"https://api.github.com/users/FGrose","html_url":"https://github.com/FGrose","followers_url":"https://api.github.com/users/FGrose/followers","following_url":"https://api.github.com/users/FGrose/following{/other_user}","gists_url":"https://api.github.com/users/FGrose/gists{/gist_id}","starred_url":"https://api.github.com/users/FGrose/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/FGrose/subscriptions","organizations_url":"https://api.github.com/users/FGrose/orgs","repos_url":"https://api.github.com/users/FGrose/repos","events_url":"https://api.github.com/users/FGrose/events{/privacy}","received_events_url":"https://api.github.com/users/FGrose/received_events","type":"User","site_admin":false},"repo":{"id":47011965,"name":"dracut","full_name":"FGrose/dracut","owner":{"login":"FGrose","id":4335897,"avatar_url":"https://avatars.githubusercontent.com/u/4335897?v=3","gravatar_id":"","url":"https://api.github.com/users/FGrose","html_url":"https://github.com/FGrose","followers_url":"https://api.github.com/users/FGrose/followers","following_url":"https://api.github.com/users/FGrose/following{/other_user}","gists_url":"https://api.github.com/users/FGrose/gists{/gist_id}","starred_url":"https://api.github.com/users/FGrose/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/FGrose/subscriptions","organizations_url":"https://api.github.com/users/FGrose/orgs","repos_url":"https://api.github.com/users/FGrose/repos","events_url":"https://api.github.com/users/FGrose/events{/privacy}","received_events_url":"https://api.github.com/users/FGrose/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/FGrose/dracut","description":"","fork":true,"url":"https://api.github.com/repos/FGrose/dracut","forks_url":"https://api.github.com/repos/FGrose/dracut/forks","keys_url":"https://api.github.com/repos/FGrose/dracut/keys{/key_id}","collaborators_url":"https://api.github.com/repos/FGrose/dracut/collaborators{/collaborator}","teams_url":"https://api.github.com/repos/FGrose/dracut/teams","hooks_url":"https://api.github.com/repos/FGrose/dracut/hooks","issue_events_url":"https://api.github.com/repos/FGrose/dracut/issues/events{/number}","events_url":"https://api.github.com/repos/FGrose/dracut/events","assignees_url":"https://api.github.com/repos/FGrose/dracut/assignees{/user}","branches_url":"https://api.github.com/repos/FGrose/dracut/branches{/branch}","tags_url":"https://api.github.com/repos/FGrose/dracut/tags","blobs_url":"https://api.github.com/repos/FGrose/dracut/git/blobs{/sha}","git_tags_url":"https://api.github.com/repos/FGrose/dracut/git/tags{/sha}","git_refs_url":"https://api.github.com/repos/FGrose/dracut/git/refs{/sha}","trees_url":"https://api.github.com/repos/FGrose/dracut/git/trees{/sha}","statuses_url":"https://api.github.com/repos/FGrose/dracut/statuses/{sha}","languages_url":"https://api.github.com/repos/FGrose/dracut/languages","stargazers_url":"https://api.github.com/repos/FGrose/dracut/stargazers","contributors_url":"https://api.github.com/repos/FGrose/dracut/contributors","subscribers_url":"https://api.github.com/repos/FGrose/dracut/subscribers","subscription_url":"https://api.github.com/repos/FGrose/dracut/subscription","commits_url":"https://api.github.com/repos/FGrose/dracut/commits{/sha}","git_commits_url":"https://api.github.com/repos/FGrose/dracut/git/commits{/sha}","comments_url":"https://api.github.com/repos/FGrose/dracut/comments{/number}","issue_comment_url":"https://api.github.com/repos/FGrose/dracut/issues/comments{/number}","contents_url":"https://api.github.com/repos/FGrose/dracut/contents/{+path}","compare_url":"https://api.github.com/repos/FGrose/dracut/compare/{base}...{head}","merges_url":"https://api.github.com/repos/FGrose/dracut/merges","archive_url":"https://api.github.com/repos/FGrose/dracut/{archive_format}{/ref}","downloads_url":"https://api.github.com/repos/FGrose/dracut/downloads","issues_url":"https://api.github.com/repos/FGrose/dracut/issues{/number}","pulls_url":"https://api.github.com/repos/FGrose/dracut/pulls{/number}","milestones_url":"https://api.github.com/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