"java.lang.RuntimeException : com.atlassian.bamboo.repository.RepositoryException: Mercurial Executable capability `/usr/local/bin/hg' does not seem to be a hg client. Is it properly set?"
but executable exists and works properly.
Some experimants shows that bamboo calls hg with illegal arguments:
version --config ui.ssh=ssh -o StrictHostKeyChecking=no -o BatchMode=yes
hg reports:
hg version: option -o not recognized
---------------------
java.lang.RuntimeException: com.atlassian.bamboo.repository.RepositoryException: Mercurial Executable capability `/usr/local/bin/hg' does not seem to be a hg client. Is it properly set?
	at com.atlassian.bamboo.executor.RetryingTaskExecutor.rerun(RetryingTaskExecutor.java:119)
	at com.atlassian.bamboo.executor.RetryingTaskExecutor.runTask(RetryingTaskExecutor.java:79)

Caused by: com.atlassian.bamboo.repository.RepositoryException: Mercurial Executable capability `/usr/local/bin/hg' does not seem to be a hg client. Is it properly set?
	at com.atlassian.bamboo.plugins.hg.HgCommandProcessor.checkHgExistenceInSystem(HgCommandProcessor.java:91)
	at com.atlassian.bamboo.plugins.hg.HgRepositoryAccessImpl.<init>(HgRepositoryAccessImpl.java:82)