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infra/common.sh: add shard_should_run()

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Detects whether test block should be run in the current test shard.

if shard_should_run; then
 ...
fi

Bug: b/185520507
Change-Id: I408d226651630a01c5e447dbff7d26b73426ce42
This commit is contained in:
James Zern 2021-10-27 13:05:03 -07:00
parent 21d24b4c08
commit 0e0f74b7e3
1 changed files with 27 additions and 0 deletions
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27
infra/common.sh
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@ -71,3 +71,30 @@ setup_ccache() {
export PATH="/usr/lib/ccache:${PATH}"
fi
}
#######################################
# Detects whether test block should be run in the current test shard.
# Globals:
# TEST_TOTAL_SHARDS: Valid range: [1, N]. Defaults to 1.
# TEST_SHARD_INDEX: Valid range: [0, TEST_TOTAL_SHARDS). Defaults to 0.
# libwebp_test_id: current test number; incremented with each call.
# Arguments:
# None
# Returns:
# true if the shard is active
# false if the shard is inactive
#######################################
shard_should_run() {
TEST_TOTAL_SHARDS=${TEST_TOTAL_SHARDS:=1}
TEST_SHARD_INDEX=${TEST_SHARD_INDEX:=0}
libwebp_test_id=${libwebp_test_id:=-1}
: $((libwebp_test_id += 1))
if [[ "${TEST_SHARD_INDEX}" -lt 0 ||
"${TEST_SHARD_INDEX}" -ge "${TEST_TOTAL_SHARDS}" ]]; then
log_err "Invalid TEST_SHARD_INDEX (${TEST_SHARD_INDEX})!" \
"Expected [0, ${TEST_TOTAL_SHARDS})."
fi
[[ "$((libwebp_test_id % TEST_TOTAL_SHARDS))" -eq "${TEST_SHARD_INDEX}" ]]
}