diff --git a/notebook/data.archives.software-heritage.org b/notebook/data.archives.software-heritage.org
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+:PROPERTIES:
+:ID:       9c85ffb2-fc90-4b38-abce-f0425a2b79de
+:END:
+#+title: Software Heritage
+#+date: 2021-07-25 21:01:45 +08:00
+#+date_modified: 2021-07-27 23:11:52 +08:00
+#+language: en
+
+
+- project link is at https://www.softwareheritage.org/
+- the infrastructure and tools they used is also open source;
+  primarily happening at [[https://forge.softwareheritage.org/][their software forge]]
+- an ambitious project archiving all of humanity's publicly available source code
+- primarily made for researchers to easily refer to software;
+  a centralized database for referring software, in other words
+- it is stored in a global merkle tree which each project is given an identifer referred to as Software Heritage persistent identifiers (SWHIDs)
+- the archive itself is more of a gigantic merkle tree with the ability to interact with the individualities such as commits, revisions, snapshots, and even the very source code files of an archived repo
+- funded from donations including big companies and several not-for-profit foundations
+- a big component for [[id:6eeb7a24-b662-46d6-9ece-00a5028ff4d8][Reproducible research]] for other projects such as [[id:3b3fdcbf-eb40-4c89-81f3-9d937a0be53c][Nix package manager]] and [[id:be917383-84c4-4bf5-9ca0-b04bfb778f4f][Guix package manager]] used as a fallback when upstream vanished;
+  soon enough, it will develop tools to integrate them further such as archiving the code used to build the binary cache
+- there is a [[https://archive.softwareheritage.org/][public interface for browsing the archive]]
+- they have dedicated resources into creating an infrastructure for creating a centralized reference for software such as a user-local filesystem integrating the archive for development workflow (see [[id:4703f8c2-225c-4c76-a788-af04b84309ac][The Software Heritage Filesystem (SwhFS): Integrating Source Code Archival with Development]])
diff --git a/notebook/data.software-archives.org b/notebook/data.software-archives.org
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+:PROPERTIES:
+:ID:       67ed9916-0e60-44fa-8844-af86727870fc
+:END:
+#+title: Software archives
+#+date: 2021-07-25 19:20:39 +08:00
+#+date_modified: 2021-07-27 17:31:16 +08:00
+#+language: en
+
+
+- [[id:9c85ffb2-fc90-4b38-abce-f0425a2b79de][Software Heritage]] is an ambitious project archiving all of the source code of humanity.
+  Has a [[https://archive.softwareheritage.org/][browsable interface]] of the total archive.
+
+- roam:archive.org has [[https://archive.org/details/software][a dedicated section for software]].
+  They are especially nice for scouring historical versions of software.
+
+- [[id:f3f1201a-9fb9-4481-981f-5f50f8982a5e][Arch Linux]] has an [[https://archive.archlinux.org/][archive]] that keeps the snapshots, packages, and repos for a few years before uploading it to their [[https://archive.org/details/archlinuxarchive][historical archive]].
+
+- [[id:3b3fdcbf-eb40-4c89-81f3-9d937a0be53c][Nix package manager]] has [[https://cache.nixos.org/][a binary cache]].
+  According to [[https://chaos.social/@davidak/106640211327736471][one of the contributors]], it makes up 120TB as of 2021-07-25.
+
+- [[id:be917383-84c4-4bf5-9ca0-b04bfb778f4f][Guix package manager]] has a binary cache primarily maintained with its [[https://ci.guix.gnu.org/][homegrown continuous integration software]].
+
+- roam:F-Droid has an archive for its compiled apps.
+  From [[https://mastodon.technology/@fdroidorg/106635571616898675][one of their comments]], it is sitting at ~390GB as of 2021-07-25.
diff --git a/notebook/literature.allanconSoftwareHeritageFilesystem2021.org b/notebook/literature.allanconSoftwareHeritageFilesystem2021.org
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+:PROPERTIES:
+:ID:       4703f8c2-225c-4c76-a788-af04b84309ac
+:ROAM_REFS: cite:allanconSoftwareHeritageFilesystem2021
+:END:
+#+title: The Software Heritage Filesystem (SwhFS): Integrating Source Code Archival with Development
+#+date: 2021-07-27 17:06:14 +08:00
+#+date_modified: 2021-07-27 23:07:36 +08:00
+#+published: 2021-02-12
+#+author: Allançon, T., Pietri, A., & Zacchiroli, S.
+#+source: http://arxiv.org/abs/2102.06390
+#+language: en
+
+
+- primarily features =swh-fuse=, a utility allowing to mount software from Software Heritage to your local environment
+- it is based from POSIX filesystems built with FUSE framework;
+  as such it does not require root privileges to use it
+- it exposes the global merkle tree as a filesystem along with its metadata, archive, etc.
+- it can interact with the objects in the merkle tree such as the source code files, commits, snapshots, etc.
+- the tool is essentially a FUSE adapter to Software Heritage API
+
+features:
+- the tool loads the archives lazily to save bandwidth and disk space
+- caches for performance especially with how bad remote filesystems can be
+- reduces redundancy by using symlinks extensively
diff --git a/notebook/tools.swh-fuse.org b/notebook/tools.swh-fuse.org
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+#+title: swh-fuse
+#+date: 2021-07-27 21:02:05 +08:00
+#+date_modified: 2021-07-27 22:08:39 +08:00
+#+language: en
+
+
+A tool to interact with the Software Heritage Filesystem (SwhFS);
+you can see [[id:4703f8c2-225c-4c76-a788-af04b84309ac][The Software Heritage Filesystem (SwhFS): Integrating Source Code Archival with Development]] paper for an introduction.
+
+Some details about the tool itself...
+
+- It is mainly used with the =swh fs= subcommand.
+
+- To mount the filesystem itself, use =swh fs mount DIRECTORY=.
+
+When mounted, the directory should have the following structure:
+
+#+begin_src
+swhfs
+├── archive/
+├── cache/
+├── origin/
+└── README
+#+end_src
+
+- =archive/= is the entry point for the archived repos in the library;
+  the files inside there cannot be listed (e.g., =ls=, file managers)
+  but you can access the files inside of it (e.g., text editors, file openers)
+- =cache/= contains on-disk representation of metadata
+- =origin/= is where mounting of origins with an encoded URL
+
+For up-to-date information, you can read the =README= file.
+
+With the complete setup, you are now ready to interact with the filesystem.
+The point of interest here is the =archive/= directory which holds all of the archived source code in the library.
+
+You can interact with it by accessing one of the repo through their SWHID.
+
+#+begin_src shell  :eval no
+ls swhfs/archive/${SWHID}
+#+end_src
+
+The tool lazily loads the repo, saving bandwidth and disk space.