I want to know the exact difference between the semver notations in package.json. Can someone explain me.
I think the npm documentation explains it well: https://docs.npmjs.com/cli/v6/using-npm/semver#advanced-range-syntax
Since there is a lot going on, perhaps a brief explanation of the two most common:
The caret modifier (^) will automatically go the highest minor and patch version, unless the major version is 0. In this case, will only update the patch version.
The tilde modifier (~) will only go to the highest patch version. So ~ and ^ are equal when the major version is 0.
Semver notation isn't specifically used in package.json.
If it's followed (*1), it helps developers to understand what to expect from any particular update. Imagine you want to bump the version of a library, and you see that the difference is in the major part of the version (n in n.*.*). This can point out to potential repercussions of upgrading the package - according to SEMVER MAJOR version when you make incompatible API changes,.
*1 It's not always followed by developers. One prominent example is React Native. The developers have never released a Major version, and treat MINOR as MAJOR
I got this from node js documentation. There is a pretty well explanation for question.
https://nodejs.dev/learn/the-package-lock-json-file
In package.json you can set which versions you want to upgrade to (patch or minor), using the semver notation, for example:
if you write ~0.13.0, you want to only update patch releases: 0.13.1
is ok, but 0.14.0 is not.
if you write ^0.13.0, you want to get
updates that do not change the leftmost non-zero number: 0.13.1,
0.13.2 and so on.
If you write ^1.13.0, you will get patch and minor releases: 1.13.1, 1.14.0 and so on up to 2.0.0 but not 2.0.0.
if you
write 0.13.0, that is the exact version that will be used, always
The semantic versioning system states that a backwards compatible bugfix means that you increment the patch version number (z in x.y.z). It also states that a backwards compatible feature addition should be introduced by incrementing the minor version number (y in x.y.z).
What if both of these things have been added a new release is due? Does one only increment the minor version number?
Semver is a great framework when each addition gets its own release. In this case, you would have ideally released the patch version updates for each bug fix, and then the minor version. However, having collated all those things together, your intuition is right. You can simply bypass the patch versions and bump the minor version. Just make sure to mention the bug fixes in the changelog to help your users know what has happened.
And remember, frameworks are meant to enable you to do things quickly, rather than be strict guidelines. So, nothing out there says that what you're doing goes against semver, it's just adapted to your way of working.
I was looking at torch versions
https://pypi.org/project/torch/#history
1.5.0
1.4.0
1.3.1
1.3.0.post2
1.3.0
1.2.0
1.1.0.post2
1.1.0
1.0.1.post2
1.0.1
1.0.0
0.4.1.post2
0.4.1
0.4.0
0.3.1
0.3.0.post4
0.1.2.post2
0.1.2.post1
And I found out that some versions have the suffix .post2 (or .post3, post4).
At first I thought it was a release made after the minor version X release already happened (postX), but then I saw 1.3.0.post2, so that doesn't seem to make sense.
Also, pytorch doesn't seem to follow semver.
What does postX mean?
It seems like related to PEP-0440 and post releases: https://www.python.org/dev/peps/pep-0440/#post-releases
Post-releases
Some projects use post-releases to address minor errors in a final release that do not affect the distributed software (for example, correcting an error in the release notes).
If used as part of a project's development cycle, these post-releases are indicated by including a post-release segment in the version identifier:
X.Y.postN # Post-release
A version identifier that includes a post-release segment without a developmental release segment is termed a "post-release".
The post-release segment consists of the string .post, followed by a non-negative integer value. Post-releases are ordered by their numerical component, immediately following the corresponding release, and ahead of any subsequent release.
Note
The use of post-releases to publish maintenance releases containing
actual bug fixes is strongly discouraged. In general, it is better to
use a longer release number and increment the final component for each
maintenance release.
But I still don't know how pytorch uses post since it seems to jump some postN versions .
The rules for when to increase the MAJOR vs the MINOR version number with SemVer 2.0 are very compelling. They clearly give a lot of advantages to knowing if the app/service is backwards compatible.
But the site does not really give an reason for the differences between a MINOR and what it calls a PATCH. I don't see it giving the same benefits of MAJOR vs MINOR.
For reference here are the SemVer rules:
MAJOR version when you make incompatible API changes,
MINOR version when you add functionality in a backwards-compatible manner, and
PATCH version when you make backwards-compatible bug fixes.
So the only difference between MINOR and PATCH is features vs bug fixes. My company wants to do that differently.
They want to have MINOR be a collection of [backwards compatible] features. "PATCH" (which we call Incremental) be the releases needed to get those features out. (We release bug fixes as we release features.)
For example, if we plan for 7 [backwards compatible] features in our 2.4 release then 2.4.0 may have 2 of the features, 2.4.1 would have 3 more features and 2.4.2 would have the last 2 (perhaps with a bug fix or two in each release).
I can see that this violates SemVer, but I need to know why SemVer has decided to be prescriptive on the differences between the MINOR and PATCH versions so I can know which way to push my company.
NOTE: I hope that this is not too subjective for Stack Overflow. I don't usually ask questions like this, so it is possible that this question will need to be closed...
The standard is deliberately terse. There's nothing in it that prevents you from releasing a bunch of bug fixes along with your new features and you only have to bump the minor field when you do this. If the changes only involve bug fixes, refactoring or documentation that does not add, remove or modify any interface, then you only bump the patch. The whole point is to communicate to your consumers, their level of risk when taking an update from you.
EDIT:
It is a best practice to separate bug fixes (patches) from feature work (minor) and breaking changes (major), into separate releases. This allows your consumers to automatically pick up the latest fixes, without having to deal with feature bloat or breaking changes.
For example, if we plan for 7 [backwards compatible] features in our 2.4 release then 2.4.0 may have 2 of the features, 2.4.1 would have 3 more features and 2.4.2 would have the last 2 (perhaps with a bug fix or two in each release).
Nothing stops you following SemVer convention and release 2.4.0 with 2 features, 2.5.0 with 3 more features and 2.6.0 with last 2 features and a few bug fixes for previously released features.
It is better to follow some common convention instead of reinventing the wheel. You save time thinking, discussing and documenting a custom solution as well as avoid confusion within the team and newcomers.
https://semver.org/
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I distribute software online, and always wonder if there is a proper way to better define version numbers.
Let's assume A.B.C.D in the answers. When do you increase each of the components?
Do you use any other version number tricks such as D mod 2 == 1 means it is an in house release only?
Do you have beta releases with their own version numbers, or do you have beta releases per version number?
I'm starting to like the Year.Release[.Build] convention that some apps (e.g. Perforce) use. Basically it just says the year in which you release, and the sequence within that year. So 2008.1 would be the first version, and if you released another a months or three later, it would go to 2008.2.
The advantage of this scheme is there is no implied "magnitude" of release, where you get into arguments about whether a feature is major enough to warrant a major version increment or not.
An optional extra is to tag on the build number, but that tends to be for internal purposes only (e.g. added to the EXE/DLL so you can inspect the file and ensure the right build is there).
In my opinion, almost any release number scheme can be made to work more or less sanely. The system I work on uses version numbers such as 11.50.UC3, where the U indicates 32-bit Unix, and the C3 is a minor revision (fix pack) number; other letters are used for other platform types. (I'd not recommend this scheme, but it works.)
There are a few golden rules which have not so far been stated, but which are implicit in what people have discussed.
Do not release the same version twice - once version 1.0.0 is released to anyone, it can never be re-released.
Release numbers should increase monotonically. That is, the code in version 1.0.1 or 1.1.0 or 2.0.0 should always be later than version 1.0.0, 1.0.9, or 1.4.3 (respectively).
Now, in practice, people do have to release fixes for older versions while newer versions are available -- see GCC, for example:
GCC 3.4.6 was released after 4.0.0, 4.1.0 (and AFAICR 4.2.0), but it continues the functionality of GCC 3.4.x rather than adding the extra features added to GCC 4.x.
So, you have to build your version numbering scheme carefully.
One other point which I firmly believe in:
The release version number is unrelated to the CM (VCS) system version numbering, except for trivial programs. Any serious piece of software with more than one main source file will have a version number unrelated to the version of any single file.
With SVN, you could use the SVN version number - but probably wouldn't as it changes too unpredictably.
For the stuff I work with, the version number is a purely political decision.
Incidentally, I know of software that went through releases from version 1.00 through 9.53, but that then changed to 2.80. That was a gross mistake - dictated by marketing. Granted, version 4.x of the software is/was obsolete, so it didn't immediately make for confusion, but version 5.x of the software is still in use and sold, and the revisions have already reached 3.50. I'm very worried about what my code that has to work with both the 5.x (old style) and 5.x (new style) is going to do when the inevitable conflict occurs. I guess I have to hope that they will dilly-dally on changing to 5.x until the old 5.x really is dead -- but I'm not optimistic. I also use an artificial version number, such as 9.60, to represent the 3.50 code, so that I can do sane if VERSION > 900 testing, rather than having to do: if (VERSION >= 900 || (VERSION >= 280 && VERSION < 400), where I represent version 9.00 by 900. And then there's the significant change introduced in version 3.00.xC3 -- my scheme fails to detect changes at the minor release level...grumble...grumble...
NB: Eric Raymond provides Software Release Practice HOWTO including the (linked) section on naming (numbering) releases.
I usually use D as a build counter (automatic increment by compiler)
I increment C every time a build is released to "public" (not every build is released)
A and B are used as major/minor version number and changed manually.
I think there are two ways to answer this question, and they are not entirely complimentary.
Technical: Increment versions based on technical tasks. Example: D is build number, C is Iteration, B is a minor release, A is a major release. Defining minor and major releases is really subjective, but could be related things like changes to underlying architecture.
Marketing: Increment versions based on how many "new" or "useful" features are being provided to your customers. You may also tie the version numbers to an update policy...Changes to A require the user to purchase an upgrade license, whereas other changes do not.
The bottom line, I think, is finding a model that works for you and your customers. I've seen some cases where even versions are public releases, and odd versions are considered beta, or dev releases. I've seen some products which ignore C and D all together.
Then there is the example from Micrsoft, where the only rational explanation to the version numbers for the .Net Framework is that Marketing was involved.
Our policy:
A - Significant (> 25%) changes or
additions in functionality or
interface.
B - small changes or
additions in functionality or
interface.
C - minor changes that
break the interface.
D - fixes to a
build that do not change the
interface.
People tend to want to make this much harder than it really needs to be. If your product has only a single long-lived branch, just name successive versions by their build number. If you've got some kind of "minor bug fixes are free, but you have to pay for major new versions", then use 1.0, 1.1 ... 1.n, 2.0, 2.1... etc.
If you can't immediately figure out what the A,B,C, and D in your example are, then you obviously don't need them.
The only use I have ever made of the version number was so that a customer could tell me they're using version 2.5.1.0 or whatever.
My only rule is designed to minimize mistakes in reporting that number: all four numbers have to be 1 digit only.
1.1.2.3
is ok, but
1.0.1.23
is not. Customers are likely to report both numbers (verbally, at least) as "one-one-two-three".
Auto-incrementing build numbers often results in version numbers like
1.0.1.12537
which doesn't really help, either.
A good and non-technical scheme just uses the build date in this format:
YYYY.MM.DD.BuildNumber
Where BuildNumber is either a continuous number (changelist) or just starts over at 1 each day.
Examples: 2008.03.24.1 or 2008.03.24.14503
This is mainly for internal releases, public releases would see the version printed as 2008.03 if you don't release more often than once a month. Maintenance releases get flagged as 2008.03a 2008.03b and so on. They should rarely go past "c" but if it does it's a good indicator you need better QA and/or testing procedures.
Version fields that are commonly seen by the user should be printed in a friendly "March 2008" format, reserve the more technical info in the About dialog or log files.
Biggest disadvantage: just compiling the same code on another day might change the version number. But you can avoid this by using the version control changelist as last number and checking against that to determine if the date needs to be changed as well.
In the github world, it has become popular to follow Tom Preston-Werner's "semver" spec for version numbers.
From http://semver.org/ :
Given a version number MAJOR.MINOR.PATCH, increment the:
MAJOR version when you make incompatible API changes, MINOR version
when you add functionality in a backwards-compatible manner, and PATCH
version when you make backwards-compatible bug fixes. Additional
labels for pre-release and build metadata are available as extensions
to the MAJOR.MINOR.PATCH format.
I use V.R.M e.g. 2.5.1
V (version) changes are a major rewrite
R (revision) changes are significant new features or bug fixes
M (modification) changes are minor bux fixes (typos, etc)
I sometimes use an SVN commit number on the end too.
Its all really subjective at the end of the day and simply up to yourself/your team.
Just take a look at all the answers already - all very different.
Personally I use Major.Minor.*.* - Where Visual Studio fills in the revison/build number automatically. This is used where I work too.
I like Year.Month.Day. So, v2009.6.8 would be the "version" of this post. It is impossible to duplicate (reasonably) and it very clear when something is a newer release. You could also drop the decimals and make it v20090608.
In the case of a library, the version number tells you about the level of compatibility between two releases, and thus how difficult an upgrade will be.
A bug fix release needs to preserve binary, source, and serialization compatibility.
Minor releases mean different things to different projects, but usually they don't need to preserve source compatibility.
Major version numbers can break all three forms.
I wrote more about the rationale here.
For in-house development, we use the following format.
[Program #] . [Year] . [Month] . [Release # of this app within the month]
For example, if I'm releasing application # 15 today, and it's the third update this month, then my version # will be
15.2008.9.3
It's totally non-standard, but it is useful for us.
For the past six major versions, we've used M.0.m.b where M is the major version, m is the minor version, and b is the build number. So released versions included 6.0.2, 7.0.1, ..., up to 11.0.0. Don't ask why the second number is always 0; I've asked a number of times and nobody really knows. We haven't had a non-zero there since 5.5 was released in 1996.