Netlify preview builds silently fail with Deploy Preview canceled

[arhadthedev]

I noticed that netlify/python-cpython-preview/deploy-preview stopped publishing previews at least three weeks ago (somewhere around gh-102712; after-merge comments make sorting PRs by Recently updated imprecise).

Clicking on Details of the check opens a log like this:

7:24:47 PM: build-image version: 91488c6c0412f5c1c00fb34eff5c1fc41a32bce9 (focal)
7:24:47 PM: buildbot version: 91488c6c0412f5c1c00fb34eff5c1fc41a32bce9
7:24:47 PM: Fetching cached dependencies
7:24:47 PM: Starting to download cache of 449.0MB
7:24:51 PM: Finished downloading cache in 4.02s
7:24:51 PM: Starting to extract cache
7:24:53 PM: Finished extracting cache in 1.442s
7:24:53 PM: Finished fetching cache in 5.545s
7:24:53 PM: Starting to prepare the repo for build
7:24:53 PM: Preparing Git Reference pull/103591/head
7:24:54 PM: Parsing package.json dependencies
7:24:55 PM: Different build dir detected, going to use the one specified in the Netlify configuration file: 'Doc' versus 'Doc/' in the Netlify UI
7:24:55 PM: Different publish path detected, going to use the one specified in the Netlify configuration file: 'Doc/build/html' versus 'build/html' in the Netlify UI
7:24:55 PM: Detected ignore command in Netlify configuration file. Proceeding with the specified command: 'git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF . ../netlify.toml'
7:24:55 PM: User-specified ignore command returned exit code 0. Returning early from build.
7:24:55 PM: Failed during stage 'checking build content for changes': Canceled build due to no content change
7:24:55 PM: Finished processing build request in 8.136s

Linked PRs

• gh-103604: Fix incorrect paths in netlify.toml #103605

[arhadthedev]

#103605 (review)

[arhadthedev]

The issue strikes again in https://app.netlify.com/sites/python-cpython-preview/deploys/644d5eaf0f7bea000835be2b (triggered by gh-98059):

Deploy failed for python-cpython-preview
Today at 10:15 PM

PR#98059: find_loader@c1ab102

10:15:18 PM: build-image version: a968751fa4fa5480005f9e300e07554d2cf87d06 (focal)
10:15:18 PM: buildbot version: 8b65fed9bc22a54aead1b50de89fea883757023a
10:15:18 PM: Fetching cached dependencies
10:15:18 PM: Starting to download cache of 451.6MB
10:15:22 PM: Finished downloading cache in 4.156s
10:15:22 PM: Starting to extract cache
10:15:24 PM: Finished extracting cache in 1.373s
10:15:24 PM: Finished fetching cache in 5.597s
10:15:24 PM: Starting to prepare the repo for build
10:15:24 PM: Preparing Git Reference pull/98059/head
10:15:25 PM: Parsing package.json dependencies
10:15:26 PM: Different build dir detected, going to use the one specified in the Netlify configuration file: 'Doc' versus 'Doc/' in the Netlify UI
10:15:26 PM: Different publish path detected, going to use the one specified in the Netlify configuration file: 'Doc/build/html' versus 'build/html' in the Netlify UI
10:15:26 PM: Detected ignore command in Netlify configuration file. Proceeding with the specified command: 'git diff --quiet $CACHED_COMMIT_REF $COMMIT_REF . ../netlify.toml'
10:15:26 PM: User-specified ignore command returned exit code 0. Returning early from build.
10:15:26 PM: Failed during stage 'checking build content for changes': Canceled build due to no content change
10:15:26 PM: Finished processing build request in 8.377s

[hugovk]

Will effectively be fixed by #103843, I'll follow up on it.