Project load failure on git describe abbrev failure

[ignasi35]

sbt-dynver uses git describe --abbrev=8 and the pattern matches on exactly 8 characters for the abbreviated SHA-1.

git describe --abbrev=<n> produces a shortened representation of the SHA-1 of at least n.

sbt-dynver causes a MatchError whenever the abbreviated SHA-1 is longer than 8:

[info] Loading settings for project root from build.sbt ...
[info] Resolving key references (69692 settings) ...
[error] scala.MatchError: 1.6.0-M4+51-8dc64459f+20190718-1826
[error]  (of class java.lang.String)
[error]         at scala.PartialFunction$$anon$1.apply(PartialFunction.scala:255)
[error]         at scala.PartialFunction$$anon$1.apply(PartialFunction.scala:253)
[error]         at sbtdynver.GitDescribeOutput$Parser$$anonfun$parse$1.applyOrElse(DynVerPlugin.scala:145)
[error]         at sbtdynver.GitDescribeOutput$Parser$$anonfun$parse$1.applyOrElse(DynVerPlugin.scala:145)
[error]         at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:34)
[error]         at scala.Option.map(Option.scala:146)
[error]         at sbtdynver.DynVer.getGitDescribeOutput(DynVerPlugin.scala:210)
[error]         at sbtdynver.DynVerPlugin$.$anonfun$buildSettings$7(DynVerPlugin.scala:50)
[error]         at scala.Function1.$anonfun$compose$1(Function1.scala:44)
[error]         at sbt.internal.util.EvaluateSettings$MixedNode.evaluate0(INode.scala:221)
[error]         at sbt.internal.util.EvaluateSettings$INode.evaluate(INode.scala:164)
[error]         at sbt.internal.util.EvaluateSettings.$anonfun$submitEvaluate$1(INode.scala:87)
[error]         at sbt.internal.util.EvaluateSettings.sbt$internal$util$EvaluateSettings$$run0(INode.scala:98)
[error]         at sbt.internal.util.EvaluateSettings$$anon$3.run(INode.scala:94)
[error]         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[error]         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[error]         at java.lang.Thread.run(Thread.java:748)
[error] scala.MatchError: 1.6.0-M4+51-8dc64459f+20190718-1826
[error]  (of class java.lang.String)
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? 

which can be reproduced using this commit (NOTE: the link is now broken because I rebased but I kept the commit reproducing the error here).

The workaround is to amend the commit to get a different SHA-1 so the hash collision resolves.

[dwijnand]

https://github.com/ignasi35/lagom/tree/sbt-dynver-reproducer

[johanandren]

Just got hit by this one as well. (Thanks for writing down what to do about it or I would have spent the day 🙇 )

[davidcorcoran]

(Seeing this in sbt-synver 4.0.0 and 4.1.1)

Just hit this one too. You can see the abbreviated git hash (0147e8bb2) is 9 characters.

$ git describe --tags --abbrev=8
v1.11.1-2-g0147e8bb2

So running sbt produces this stack trace:

scala.MatchError: v1.11.1+2-0147e8bb2
 (of class java.lang.String)
        at scala.PartialFunction$$anon$1.apply(PartialFunction.scala:259)
        at scala.PartialFunction$$anon$1.apply(PartialFunction.scala:257)
        at sbtdynver.GitDescribeOutput$Parser$$anonfun$parse$1.applyOrElse(DynVerPlugin.scala:145)
        at sbtdynver.GitDescribeOutput$Parser$$anonfun$parse$1.applyOrElse(DynVerPlugin.scala:145)
        at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:38)
        at scala.Option.map(Option.scala:230)
        at sbtdynver.DynVer.getGitDescribeOutput(DynVerPlugin.scala:210)
        at sbtdynver.DynVerPlugin$.$anonfun$buildSettings$7(DynVerPlugin.scala:50)
        at scala.Function1.$anonfun$compose$1(Function1.scala:49)
        at sbt.internal.util.EvaluateSettings$MixedNode.evaluate0(INode.scala:228)
        at sbt.internal.util.EvaluateSettings$INode.evaluate(INode.scala:170)
        at sbt.internal.util.EvaluateSettings.$anonfun$submitEvaluate$1(INode.scala:87)
        at sbt.internal.util.EvaluateSettings.sbt$internal$util$EvaluateSettings$$run0(INode.scala:99)
        at sbt.internal.util.EvaluateSettings$$anon$3.run(INode.scala:94)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:834)
[error] scala.MatchError: v1.11.1+2-0147e8bb2

@ignasi35 thanks for figuring it out. Saved me a lot of time...