Error if we're not the first buildpack #14
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I had someone using the `heroku/metrics` buildpack which writes to `.profile.d` directory running before this buildpack. Because this buildpack deletes everything at the root, including things from other build packs, the change was not preserved even though it looked like it executed correctly. I'm proposing if we detect that another buildpack has executed (i.e. if the `.profile.d` folder is not empty), that we abort and error with a helpful message: ``` [main 2446fe5] empty Enumerating objects: 1, done. Counting objects: 100% (1/1), done. Writing objects: 100% (1/1), 185 bytes | 185.00 KiB/s, done. Total 1 (delta 0), reused 0 (delta 0), pack-reused 0 remote: Compressing source files... done. remote: Building source: remote: remote: -----> Building on the Heroku-20 stack remote: -----> Using buildpacks: remote: 1. heroku/metrics remote: 2. https://github.com/schneems/subdir-heroku-buildpack#schneems/don-t-delete-profile-d remote: -----> HerokuRuntimeMetrics app detected remote: -----> Setting up .profile.d to automatically run metrics agent... remote: -----> Subdir buildpack app detected remote: -----> Subdir buildpack in api remote: Another buildpack seems to have run remote: before the subdir buildpack. This remote: may cause unexpected problems. remote: remote: Ensure '$ heroku buildpacks' lists remote: the subdir buildpack first and try remote: again. remote: ! Push rejected, failed to compile Subdir buildpack app. remote: remote: ! Push failed remote: Verifying deploy... remote: remote: ! Push rejected to still-harbor-23981. $ heroku buildpacks === still-harbor-23981 Buildpack URLs 1. heroku/metrics 2. https://github.com/schneems/subdir-heroku-buildpack#schneems/don-t-delete-profile-d ```
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I just came across another case which caused confusion when debugging, due to the subdir buildpack not being listed first (which caused the earlier buildpacks to be clobbered). @timanovsky Would you be open to merging this? |
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I had someone using the
heroku/metricsbuildpack which writes to.profile.ddirectory running before this buildpack. Because this buildpack deletes everything at the root, including things from other build packs, the change was not preserved even though it looked like it executed correctly.I'm proposing if we detect that another buildpack has executed (i.e. if the
.profile.dfolder is not empty), that we abort and error with a helpful message: