Why would a post-build step (xcopy) occasionally exit with code 2 in a TeamCity build?

Even if you provide the /Y switch with xcopy, you'll still get an error when xcopy doesn't know if the thing you are copying is a file or a directory. This error will appear as "exited with code 2". When you run the same xcopy at a command prompt, you'll see that xcopy is asking for a response of file or directory.

To resolve this issue with an automated build, you can echo in a pre-defined response with a pipe.

To say the thing you are copying is a file, echo in F:

echo F|xcopy /y ...

To say the thing you are copying is a directory, echo in D:

echo D|xcopy /y ...

Sometimes the above can be resolved by simply using a copy command instead of xcopy:

copy /y ...

However, if there are non-existent directories leading up to the final file destination, then an "exited with code 1" will occur.

Remember: use the /C switch and xcopy with caution.

I fixed the error code 2 by adding a \ at the end of my path, without it, xcopy will think that it is a file instead of a folder.

If you are using xcopy in a post build event use the /Y switch in addition to the /C.

/C           Continues copying even if errors occur.
/Y           Suppresses prompting to confirm you want to overwrite an existing file.