Railway•2w ago

overwrite files during deploy

Is it possible to overwrite a file(files) during deployment? i.e. based on env variable I would like to replace some files in /public folder. /images/ /public/ /src/ package.json etc. "build": "node copyfiles.js && next build", copyfiles.js:

const fs = require('fs')
if (process.env.NEXT_PUBLIC_THEME) {
   fs.cpSync(`images/${process.env.NEXT_PUBLIC_THEME}/`, 'public/images', { recursive: true })
}

const fs = require('fs')
if (process.env.NEXT_PUBLIC_THEME) {
   fs.cpSync(`images/${process.env.NEXT_PUBLIC_THEME}/`, 'public/images', { recursive: true })
}

it does not produce any error but files are not copied. locally it works. maybe files are read only?

Solution:

you may be interested in writing a custom Dockerfile for your app, it will give you much more control over the build process

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12 Replies

Percy•2w ago

Project ID: 2af97fce-ba10-44a9-aedb-a643afb83aec

whitetown•7d ago

2af97fce-ba10-44a9-aedb-a643afb83aec it seems it did not work with shell command either :/ cp -r images/$NEXT_PUBLIC_THEME/ public/images ok, files are copied but after deploy they are still old. I have no idea why... in the build script I added a command to check the content of destination file

cat public/manifest.json

cat public/manifest.json

it prints the new content. but after deploy mysite.com/manifest.json - it is still old one more file I create dynamically (adding .env variables for firebase auth) the file is created and auth works somehow. but when I access it via web mysite.com/process-env.js - there is still original content. is anybody there? Hi.... I gave up.. it seems something happens behind the scene with files cp -f images/favicon.ico public/favicon.ico (public/favicon.ico exists and overwritten)
cp -f images/favicon.ico public/favicon2.ico (public/favicon2.ico did not exist and copied) next build after the deploy on the web favicon.ico file is still old 😦

Brody•7d ago

hello, nothing is happening behind the scenes, this is something simple like you are copying files to / from the wrong location

whitetown•7d ago

Okay I created another project, just for testing. feel free to change there anything. e7bf8c87-4233-41c5-bb0c-1eeccb2be302 story: 1. public/ folder contains 4 colorful png file 2. theme/ folder contains black png file 3. we use cutom build command:

./theme.sh && yarn build

./theme.sh && yarn build

./theme.sh && next build

./theme.sh && next build

4. locally all squares are black. on railway they remain colourful. 5. theme.sh:

#/bin/sh

echo "copy black files to colorful files"
cp -f theme/black.png public/red.png
cp -f theme/black.png public/green.png
cp -f theme/black.png public/blue.png
cp -f theme/black.png public/yellow.png

echo "all files below have to be equal"
ls -la theme/*.png
ls -la public/*.png

#/bin/sh

echo "copy black files to colorful files"
cp -f theme/black.png public/red.png
cp -f theme/black.png public/green.png
cp -f theme/black.png public/blue.png
cp -f theme/black.png public/yellow.png

echo "all files below have to be equal"
ls -la theme/*.png
ls -la public/*.png

in logs I see that files are copied and are equal

#12 0.103 -rw-r--r-- 1 root root 9639 Sep 12 17:19 theme/black.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/blue.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/green.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/red.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/yellow.png

#12 0.103 -rw-r--r-- 1 root root 9639 Sep 12 17:19 theme/black.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/blue.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/green.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/red.png
#12 0.105 -rw-r--r-- 1 root root 9639 Sep 12 17:19 public/yellow.png

on the web they are not https://all-in-black.up.railway.app/ 😉 huh. on vercel they are black https://all-in-black.vercel.app/

Brody•7d ago

railway does not do any web caching, we simply run your app as-is

whitetown•7d ago

I do not see what exactly happening on railway, but in your logs before build #11 [stage-0 7/10] COPY . /app/. //raylway command #12 [stage-0 8/10] RUN --mount=type=cache,id=s/b5ec3316-27dc-4e02-8b03-6218db5405fe-next/cache,target=/app/.next/cache --mount=type=cache,id=s/b5ec3316-27dc-4e02-8b03-6218db5405fe-node_modules/cache,target=/app/node_modules/.cache ./theme.sh && yarn build then copiing and build is going.. after build #14 [stage-0 10/10] COPY . /app ^^^^ what is this command? maybe it restores all orifinal files?

Brody•7d ago

set NIXPACKS_NO_CACHE=1

whitetown•7d ago

I added it as env variable - deployed. it did not help. I think the issue in in this command. it's something harmful #14 [stage-0 10/10] COPY . /app I have set the Custom Start Command

ls -la public/*.png && next start

ls -la public/*.png && next start

and what I see - these files that were copied at build time and became equal are different Starting Container -rw-r--r-- 1 root root 1459 Sep 12 17:48 public/blue.png -rw-r--r-- 1 root root 534 Sep 12 17:48 public/green.png -rw-r--r-- 1 root root 5344 Sep 12 17:48 public/red.png -rw-r--r-- 1 root root 3595 Sep 12 17:48 public/yellow.png ▲ Next.js 14.2.10 - Local: http://localhost:8080 ✓ Starting... ✓ Ready in 477ms

Solution

Brody•7d ago

you may be interested in writing a custom Dockerfile for your app, it will give you much more control over the build process

whitetown•7d ago

unfortunately I am not a real backend developer and have never used Docker (only run docker desktop for some reason I do not remember). I like railway that it allows even such dumb as me to deploy everything easily. I could make a workaroud, like a special branch for deploy. but it would be nice if you fix this... well, it's not so urgent. but there is definitely something copied after deploy for some reason

Brody•7d ago

i'm sorry but this is not a platform issue

whitetown•7d ago

I would agree with you but in this case we both will be wrong 😦 my deploy command is in the middle of dosen events and since it works locally or on vercel - I assume that it works correctly. something in this chain changes files after the build

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overwrite files during deploy