author | paulson <lp15@cam.ac.uk> |
Tue, 18 Oct 2016 19:28:39 +0100 | |
changeset 64292 | bad166cb5121 |
parent 63985 | 4effb93c2a09 |
child 66753 | f7759beab4f2 |
permissions | -rw-r--r-- |
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Important notes on Mercurial repository access for Isabelle.
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Important notes on Mercurial repository access for Isabelle |
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Important notes on Mercurial repository access for Isabelle.
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=========================================================== |
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Quick start in 30min |
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-------------------- |
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1a. Linux and Mac OS X: ensure that Mercurial is installed |
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(see also http://www.selenic.com/mercurial) |
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1b. Windows: ensure that Cygwin with curl and Mercurial is installed |
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(see also http://www.cygwin.com) |
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2. Clone repository (bash shell commands): |
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hg clone http://isabelle.in.tum.de/repos/isabelle |
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cd isabelle |
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./bin/isabelle components -I |
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./bin/isabelle components -a |
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./bin/isabelle jedit -l HOL |
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./bin/isabelle build -b HOL #optional: build session image manually |
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3. Update repository (bash shell commands): |
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cd isabelle |
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hg pull -u |
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./bin/isabelle components -a |
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./bin/isabelle jedit -l HOL |
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./bin/isabelle jedit -b -f #optional: force fresh build of Isabelle/Scala |
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4. Access documentation (bash shell commands): |
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./bin/isabelle build_doc -a |
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./bin/isabelle doc system |
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Introduction |
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------------ |
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Mercurial http://www.selenic.com/mercurial belongs to source code |
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management systems that follow the so-called paradigm of "distributed |
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version control". This means plain revision control without the |
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legacy of CVS or SVN (and without the extra complexity introduced by |
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git). See also http://hginit.com/ for an introduction to the main |
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ideas. The Mercurial book http://hgbook.red-bean.com/ explains many |
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more details. |
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Mercurial offers some flexibility in organizing the flow of changes, |
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both between individual developers and designated pull/push areas that |
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are shared with others. This additional freedom demands additional |
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responsibility to maintain a certain development process that fits to |
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a particular project. |
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Regular Mercurial operations are strictly monotonic, where changeset |
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transactions are only added, but never deleted or mutated. There are |
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special tools to manipulate repositories via non-monotonic actions |
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(such as "rollback" or "strip"), but recovering from gross mistakes |
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that have escaped into the public can be hard and embarrassing. It is |
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much easier to inspect and amend changesets routinely before pushing. |
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The effect of the critical "pull" / "push" operations can be tested in |
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a dry run via "incoming" / "outgoing". The "fetch" extension includes |
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useful sanity checks beyond raw "pull" / "update" / "merge", although |
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it has lost popularity in recent years. Most other operations are |
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local to the user's repository clone. This gives some freedom for |
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experimentation without affecting anybody else. |
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Mercurial provides nice web presentation of incoming changes with a |
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digest of log entries; this also includes RSS/Atom news feeds. There |
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are add-on history browsers such as "hg view" and TortoiseHg. Unlike |
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the default web view, some of these tools help to inspect the semantic |
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content of non-trivial merge nodes. |
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Initial configuration |
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The main Isabelle repository can be cloned like this: |
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hg clone http://isabelle.in.tum.de/repos/isabelle |
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This will create a local directory "isabelle", unless an alternative |
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name is specified. The full repository meta-data and history of |
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changes is in isabelle/.hg; local configuration for this clone can be |
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added to isabelle/.hg/hgrc, but note that hgrc files are never copied |
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by another clone operation. |
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There is also $HOME/.hgrc for per-user Mercurial configuration. The |
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initial configuration requires at least an entry to identify yourself |
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as follows: |
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[ui] |
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username = XXX |
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Isabelle contributors are free to choose either a short "login name" |
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(for accounts at TU Munich) or a "full name" -- with or without mail |
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address. It is important to stick to this choice once and for all. |
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The machine default that Mercurial produces for unspecified |
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[ui]username is not appropriate. |
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Such configuration can be given in $HOME/.hgrc (for each home |
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directory on each machine) or in .hg/hgrc (for each repository clone). |
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Here are some further examples for hgrc. This is how to provide |
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default options for common commands: |
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[defaults] |
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log = -l 10 |
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This is how to configure some extension, which is called "graphlog" |
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and provides the "glog" command: |
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[extensions] |
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hgext.graphlog = |
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Shared pull/push access |
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----------------------- |
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The entry point http://isabelle.in.tum.de/repos/isabelle is world |
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readable, both via plain web browsing and the hg client as described |
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above. Anybody can produce a clone, change it locally, and then use |
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regular mechanisms of Mercurial to report changes upstream, say via |
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mail to someone with write access to that file space. It is also |
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quite easy to publish changed clones again on the web, using the |
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ad-hoc command "hg serve -v", or the hgweb.cgi or hgwebdir.cgi scripts |
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that are included in the Mercurial distribution, and send a "pull |
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request" to someone else. There are also public hosting services for |
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Mercurial repositories, notably Bitbucket. |
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The downstream/upstream mode of operation is quite common in the |
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distributed version control community, and works well for occasional |
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changes produced by anybody out there. Of course, upstream |
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maintainers need to review and moderate changes being proposed, before |
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pushing anything onto the official Isabelle repository at TUM. Direct |
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pushes are also reviewed routinely in a post-hoc fashion; everybody |
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hooked on the main repository is called to keep an eye on incoming |
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changes. In any case, changesets need to be understandable, both at |
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the time of writing and many years later. |
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Push access to the Isabelle repository requires an account at TUM, |
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with properly configured ssh to isabelle-server.in.tum.de. You also |
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need to be a member of the "isabelle" Unix group. |
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Sharing a locally modified clone then works as follows, using your |
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user name instead of "wenzelm": |
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hg out ssh://wenzelm@isabelle-server.in.tum.de//home/isabelle-repository/repos/isabelle |
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In fact, the "out" or "outgoing" command performs only a dry run: it |
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displays the changesets that would get published. An actual "push", |
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with a lasting effect on the Isabelle repository, works like this: |
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hg push ssh://wenzelm@isabelle-server.in.tum.de//home/isabelle-repository/repos/isabelle |
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Default paths for push and pull can be configured in |
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isabelle/.hg/hgrc, for example: |
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[paths] |
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default = ssh://wenzelm@isabelle-server.in.tum.de//home/isabelle-repository/repos/isabelle |
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Now "hg pull" or "hg push" will use that shared file space, unless a |
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different URL is specified explicitly. |
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When cloning a repository, the default path is set to the initial |
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source URL. So we could have cloned via that ssh URL in the first |
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place, to get exactly to the same point: |
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hg clone ssh://wenzelm@isabelle-server.in.tum.de//home/isabelle-repository/repos/isabelle |
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Simple merges |
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------------- |
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The main idea of Mercurial is to let individual users produce |
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independent branches of development first, but merge with others |
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frequently. The basic hg merge operation is more general than |
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required for the mode of operation with a shared pull/push area. The |
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"fetch" extension accommodates this case nicely, automating trivial |
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merges and requiring manual intervention for actual conflicts only. |
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The fetch extension can be configured via $HOME/.hgrc like this: |
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[extensions] |
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hgext.fetch = |
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[defaults] |
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fetch = -m "merged" |
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To keep merges semantically trivial and prevent genuine merge |
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conflicts or lost updates, it is essential to observe to following |
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general discipline wrt. the public Isabelle push area: |
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* Before editing, pull or fetch the latest version. |
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* Accumulate private commits for a maximum of 1-3 days. |
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* Start publishing again by pull or fetch, which normally produces |
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local merges. |
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* Test the merged result, e.g. like this: |
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isabelle build -a |
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* Push back in real time. |
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Piling private changes and public merges longer than 0.5-2 hours is |
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apt to produce some mess when pushing eventually! |
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The pull-test-push cycle should not be repeated too fast, to avoid |
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delaying others from doing the same concurrently. |
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Content discipline |
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------------------ |
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The following principles should be kept in mind when producing |
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changesets that are meant to be published at some point. |
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* The author of changes needs to be properly identified, using |
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[ui]username configuration as described above. |
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While Mercurial also provides means for signed changesets, we want |
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to keep things simple and trust that users specify their identity |
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correctly (and uniquely). |
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* The history of sources is an integral part of the sources |
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themselves. This means that private experiments and branches |
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should not be published by accident. Named branches are not |
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allowed on the public version. Note that old SVN-style branching |
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is replaced by regular repository clones in Mercurial. |
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Exchanging local experiments with some other users can be done |
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directly on peer-to-peer basis, without affecting the central |
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pull/push area. |
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* Log messages are an integral part of the history of sources. |
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Other people will have to inspect them routinely, to understand |
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why things have been done in a certain way at some point. |
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Authors of log entries should be aware that published changes are |
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actually read. The main point is not to announce novelties, but |
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to describe faithfully what has been done, and provide some clues |
|
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about the motivation behind it. The main recipient is someone who |
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needs to understand the change in the distant future to isolate |
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problems. Sometimes it is helpful to reference past changes |
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formally via changeset ids in the log entry. |
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* The standard changelog entry format of the Isabelle repository |
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admits several (somehow related) items to be rolled into one |
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changeset. Each item is then described on a separate line that |
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may become longer as screen line and is terminated by punctuation. |
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These lines are roughly ordered by importance. |
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This format conforms to established Isabelle tradition. In |
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contrast, the default of Mercurial prefers a single headline |
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followed by a long body text. The reason for that is a somewhat |
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different development model of typical "distributed" projects, |
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where external changes pass through a hierarchy of reviewers and |
|
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maintainers, until they end up in some authoritative repository. |
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Isabelle changesets can be more spontaneous, growing from the |
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bottom-up. |
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||
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The web style of http://isabelle.in.tum.de/repos/isabelle/ |
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accommodates the Isabelle changelog format. Note that multiple |
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lines will sometimes display as a single paragraph in HTML, so |
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some terminating punctuation is required. Do not squeeze multiple |
|
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items on the same line in the original text! |
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Testing of changes (before push) |
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-------------------------------- |
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The integrity of the standard pull/push area of Isabelle needs the be |
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preserved at all time. This means that a complete test with default |
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configuration needs to be finished successfully before push. If the |
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preparation of the push involves a pull/merge phase, its result needs |
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to covered by the test as well. |
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There are several possibilities to perform the test, e.g. using the |
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Isabelle testboard at TUM. In contrast, the subsequent command-line |
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examples are for tests on the local machine: |
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./bin/isabelle build -a #regular test |
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|
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./bin/isabelle build -a -o document=pdf #test with document preparation (optional) |
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./bin/isabelle build -a -j2 -o threads=4 #test on multiple cores (example) |
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See also the chapter on Isabelle sessions and build management in the |
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"system" manual. |
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Note that implicit dependencies on Isabelle components are specified |
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via catalog files in $ISABELLE_HOME/Admin/components/ as part of the |
|
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Mercurial history. This allows to bisect over a range of Isabelle |
|
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versions while references to the contributing components change |
|
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accordingly. Recall that "isabelle components -a" updates the local |
|
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component store monotonically according to that information, and thus |
|
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resolves missing components. |