{"id":6,"date":"2006-09-16T20:53:19","date_gmt":"2006-09-06T17:59:04","guid":{"rendered":""},"modified":"2017-03-07T16:04:34","modified_gmt":"2017-03-07T16:04:34","slug":"title_13","status":"publish","type":"post","link":"https:\/\/blogs.gentoo.org\/beu\/2006\/09\/16\/title_13\/","title":{"rendered":"Package Musings From the Core…"},"content":{"rendered":"

So, it seems that I’m destined to blog a lot<\/strong> today! \ud83d\ude09<\/p>\n

pkgcore<\/strong>
\nI’ve started working on pkgcore this (fine, sunny) afternoon, and I’ll be working on supporting binpkgs completely in pkgcore – hopefully! \ud83d\ude09 Thus far, I have a minimal doc (which will appear in my overlay shortly) with some random musings about, essentially, how we tac metadata onto a binpkg .tbz2 archive. Since binpkg code will be easy to do – it’s mainly just keeping the metadata packed on the end of a binpkg up-to-date and reading\/writing said metadata; basically, being able to introspect metadata for a binpkg easily… \ud83d\ude42<\/p>\n

I currently have a following “not all all pseudo” code:<\/p>\n

    \n
  1. mmap() open binpkg fd;<\/li>\n
  2. cast base + offset to a struct containing metadata;<\/li>\n
  3. … manipulate data …;<\/li>\n
  4. write-out data (if write operation) with a memcpy and msync();<\/li>\n
  5. munmap() binpkg fd.<\/li>\n<\/ol>\n

    Once this is done, we essentially do the following for all write operations:<\/p>\n

      \n
    1. fsync() all fds;<\/li>\n
    2. fsync all binpkg directory fds (to ensure sync!);<\/li>\n
    3. … wait for disk for flush …;<\/li>\n
    4. report status to user.<\/li>\n<\/ol>\n

      Pretty simple, fast, and effective. \ud83d\ude42 Note that this is just for the “update all binpkgs” case, not a single inspect\/change binpkg metadata… Time to put this to the test! :><\/p>\n","protected":false},"excerpt":{"rendered":"

      So, it seems that I’m destined to blog a lot today! \ud83d\ude09 pkgcore I’ve started working on pkgcore this (fine, sunny) afternoon, and I’ll be working on supporting binpkgs completely in pkgcore – hopefully! \ud83d\ude09 Thus far, I have a minimal doc (which will appear in my overlay shortly) with some random musings about, essentially, … Continue reading Package Musings From the Core…<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/posts\/6"}],"collection":[{"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/users\/51"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/comments?post=6"}],"version-history":[{"count":1,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/posts\/6\/revisions"}],"predecessor-version":[{"id":22,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/posts\/6\/revisions\/22"}],"wp:attachment":[{"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/media?parent=6"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/categories?post=6"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.gentoo.org\/beu\/wp-json\/wp\/v2\/tags?post=6"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}