Supply step do not retry when error is connection reset by peer

Start at the supply/finalize step that downloads Go and inspect the curl retry behavior described in the issue. Reproduce the failure with the provided cf run-task command and confirm that a connection-reset error is retried; done means the download no longer fails immediately on that error.

What version of Cloud Foundry and CF CLI are you using? (i.e. What is the output of running cf curl /v2/info && cf version?

{
...
   "version": 0,
   "min_cli_version": null,
   "min_recommended_cli_version": null,
   "api_version": "2.203.0",
   "osbapi_version": "2.15",
}
cf version 7.5.0+0ad1d63.2022-06-04

What version of the buildpack you are using?

We have multiple applications, the below versions are used currently.
Version: 1.8.5, 1.8.7 and 1.8.12

If you were attempting to accomplish a task, what was it you were attempting to do?

Package staging randomly fails at supply/finalize step when downloading Go without attempting any retry.

What did you expect to happen?

The curl command already has retry mechanism, and it should retry if the attempts encounter any network connection problems.

What was the actual behavior?

If the error is "connection reset by peer", the curl command do not retry and immediately return error

see https://stackoverflow.com/questions/42873285/curl-retry-mechanism

Sample log output from running the same curl command

   2023-07-18T18:17:02.90+0000 [APP/TASK/eab4dfa6/0] ERR % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
   2023-07-18T18:17:02.90+0000 [APP/TASK/eab4dfa6/0] ERR Dload  Upload   Total   Spent    Left  Speed
   2023-07-18T18:17:03.07+0000 [APP/TASK/eab4dfa6/0] ERR 0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
   2023-07-18T18:17:03.74+0000 [APP/TASK/eab4dfa6/0] ERR 0  151M    0  142k    0     0   812k      0  0:03:10 --:--:--  0:03:10  809k
   2023-07-18T18:17:03.75+0000 [APP/TASK/eab4dfa6/0] ERR 33  151M   33 50.1M    0     0  59.3M      0  0:00:02 --:--:--  0:00:02 59.3M
   2023-07-18T18:17:03.75+0000 [APP/TASK/eab4dfa6/0] ERR curl: (56) OpenSSL SSL_read: Connection reset by peer, errno 104
   2023-07-18T18:17:03.75+0000 [APP/TASK/eab4dfa6/0] OUT Exit: 56, Elapsed: 1

To reproduce, create a sample app(doesn't matter what app), then create a run-task that perpetually download the go binary

cf run-task app-1 --command 'while true; do start_time=$(date +%s); curl https://buildpacks.cloudfoundry.org/dependencies/go/go_1.19_linux_x64_cflinuxfs3_7e231ea5.tgz --location --retry 15 --retry-delay 2 --output /tmp/go.tgz; echo -n "Exit: $?, "; end_time=$(date +%s); elapsed=$(( end_time - start_time )); echo "Elapsed: $elapsed"; sleep 10; done'

Watch the app log output for errors.

Can you provide a sample app?

N/A

Please confirm where necessary:

• I have included a log output
• My log includes an error message
• I have included steps for reproduction