Error: Recipe `test` with shebang `#!/usr/bin/env bash` execution error: Permission denied (os error 13)

[Kronk74]

Hello :)

I'm using just to run command on my server and I created a recipe with bash commands like this :

Justfile

test:
  #!/usr/bin/env bash
  echo "This is a test"

Error :
error: Recipe testwith shebang#!/usr/bin/env bash execution error: Permission denied (os error 13)

Do I missed something ? Is someone already had this issue ?

I's a fresh new machine in Ubutu 22.04.

Regards,

[JohnathanFL]

I just hit the same issue and came to check if somebody had made an issue for it already. The problem (at least in my case) is that I had /tmp mounted noexec.

Try temporarily doing sudo mount -o remount,exec /tmp and see if that fixes anything.

[casey]

Thanks for opening this issue! @aidanharris opened #1708, which fixes the issue by using XDG_CACHE_HOME if the tmpdir is mounted with noexec. I'm thinking that instead of checking if the tempdir is mounted noexec, we might just consider using XDG_CACHE_HOME to avoid the extra dependency on checking mountpoint options. Does anyone have any opinions on this?

[casey]

I just merged #2067, which always uses the cache dir if available. We'll see if it causes problems for anyone, if so, we can explorer checking for noexec.

[airtonix]

fyi, I still have to put this in my ~/.bashrc in wsl2 or i still get these errors.

XDG_RUNTIME_DIR="$(mktemp -d "/tmp/xdg-runtime-XXXXXX")"
XDG_CACHE_HOME="$(mktemp -d "/tmp/xdg-cache-XXXXXX")"
export XDG_CACHE_HOME
export XDG_RUNTIME_DIR

[W1M0R]

@airtonix If you would prefer not needing to update your ~/.bashrc file, then you can also consider using the unstable [script] attribute with just recipes, instead of shebangs. You might need to add set unstable to your justfile for that to work.

[lucastheisen]

Im new to just, so sorry if i missed something important. I was testing around the edges of this issue here (wsl2 running rockylinux 9), it appears its not using XDG_CACHE_HOME, instead only using XDG_RUNTIME_DIR:

(wsl-rocky9) ltheisen@PC ~
$ XDG_RUNTIME_DIR="${HOME}/tmp" just doit 123
Version: 123

(wsl-rocky9) ltheisen@PC ~
$ XDG_CACHE_HOME="${HOME}/tmp" just doit 123
error: Recipe `doit` with shebang `#!/usr/bin/env bash` execution error: Permission denied (os error 13)

And it is quite common to have tmpfs (which run is usually) mounted noexec, and mine definitely is:

(wsl-rocky9) ltheisen@PC ~
$ mount | grep "${XDG_RUNTIME_DIR%/}"
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,noexec,relatime,mode=755)

So using XDG_RUNTIME_DIR is likely not a good choice. Could we maybe allow a --shebang-dir option, or allow JUST_SHEBANG_DIR to be explicit? or even a ~/.config/just.yml to provide global defaults or something?

Also there is no mention of this in --help or even the shebang recipies page.

[casey]

Check out #2798. I added a --tempdir command-line option, which can also be configured with JUST_TEMPDIR, which can be used to globally override where shebang and script recipes are written. I also added documentation explaining the different ways the temporary directory can be configured.

[kenden]

@casey

I am getting the following error when using ~. Maybe the param --tempdir should take an absolute path?

just --tempdir=~/tmp foo
error: Recipe `foo` could not be run because of an IO error while trying to create a temporary directory or write a file to that directory: No such file or directory (os error 2) at path "/home/redacteduser/dev/~/tmp/just-3FlApn"

[lucastheisen]

@kenden , the ~ is a shell shortcut, but it only works when its the first character of an argument. If you switch from using = to using space, it should work:

ltheisen@MY-PC ~
$ echo --tempdir=~/tmp
--tempdir=~/tmp

ltheisen@MY-PC ~
$ echo --tempdir ~/tmp
--tempdir /home/ltheisen/tmp

So use:

just --tempdir ~/tmp foo