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| # retry command with max retries and sleep time | |
| # Notes: No Spaces between commas | |
| # usage: $(call retry_command, command[,max_retries[,sleep_time]]) | |
| # example1: $(call retry_command, command -v jx,3,1s) | |
| # example2: $(call retry_command, command -v jx) | |
| # example3: $(call retry_command, command -v jx,3) | |
| define retry_command | |
| @max_retries=$(or $(2),10); \ | |
| sleep_time=$(or $(3),5s); \ | |
| retries=0; \ | |
| while ! $(1); do \ | |
| retries=$$((retries + 1)); \ | |
| if [[ $$retries -ge $$max_retries ]]; then \ | |
| echo "Failed to execute command after $$max_retries attempts."; \ | |
| exit 1; \ | |
| fi; \ | |
| echo "Retrying ($$retries/$$max_retries)..."; \ | |
| sleep $$sleep_time; \ | |
| done | |
| endef | |
| x: | |
| $(call retry_command, command -v jx) | |
| xx: | |
| $(call retry_command, x,3,1s) |
pplmx
commented
Nov 16, 2023
This code defines a makefile function named retry_command that attempts to execute a command until it succeeds or reaches a maximum number of retries. This function takes three parameters:
$(1): The command to be executed.$(2): The maximum number of retries, defaulting to 10.$(3): The wait time between each retry, defaulting to 5 seconds.
If the command still fails after reaching the maximum number of retries, the function will output an error message and exit.
Then, this code defines two targets x and xx that call the retry_command function to execute the command -v jx and x commands, respectively. For the xx target, the maximum number of retries is set to 3 and the wait time between each retry is 1 second.
This is a very practical function that can handle situations where command execution fails due to unstable network or other reasons. By retrying, it increases the chance of successful command execution.
这段代码定义了一个名为 retry_command 的 makefile 函数，它用于尝试执行一个命令直到成功，或者达到最大重试次数。这个函数接受三个参数：
$(1): 要执行的命令。$(2): 最大重试次数，默认为10次。$(3): 每次重试之间的等待时间，默认为5秒。
如果在达到最大重试次数后命令仍然失败，函数将输出一条错误消息并退出。
然后，这段代码定义了两个目标 x 和 xx，它们分别调用 retry_command 函数来执行 command -v jx 和 x 命令。对于 xx 目标，最大重试次数被设置为3次，每次重试之间的等待时间为1秒。
这是一个非常实用的函数，可以用于处理网络不稳定或者其他原因导致的命令执行失败的情况。通过重试，可以增加命令成功执行的机会。