Building without /home/${user} directory possible?

[anon45274024]

Trying to build on a host where there is no /home/${user} directory.

Conf set

CCACHE_HOST_DIR="/path/to/"
CCACHE_TARGET_DIR="/path/to"

The build then fails with

ccache: error: Failed to create directory /home/${user}/.ccache/tmp: Permission denied/

which in itself is logical since there is no /home/${user} in attendance. However, with the conf set to specific patch it would not expected that /home/${user} is being sought.

/logs/target/linux/compile.txt does not really provide further info which script/conf is causing this, even when being run in debug mode.

Is a home dir mandatory for the build process, there is nothing mentioned about it though in https://openwrt.org/docs/guide-developer/build-system/use-buildsystem, or elsewhere?

[jeff]

Perhaps it's a result of the ccache default, from the man page:

       cache_dir (CCACHE_DIR)
           This setting specifies where ccache will keep its cached compiler outputs. It will only take effect if set in the system-wide configuration file or as an
           environment variable. The default is $HOME/.ccache.

[anon45274024]

Thanks for the pointer. I would have expected that

CCACHE_HOST_DIR="/path/to/"
CCACHE_TARGET_DIR="/path/to"

would have taken care of it...

Will try now with CCACHE_DIR, see if gets parsed || applied by the build script

[jeff]

Might have to set it in the environment explicitly, or in the ccache config file.

[vgaetera]

Depending on /home/${USER} is wrong.
On the other hand, ${USER} should have access to ${HOME}.

[anon45274024]

@vgaetera

Depending on /home/${USER} is wrong.

Well, that is not my invention but printed in the log and I cannot find where it stems from and thus the issue/question

---

@vgaetera

On the other hand, ${USER} should have access to ${HOME} .

that dir exists and is accessible by the user.

[vgaetera]

@anon45274024

I cannot find where it stems from

Try something like this:

grep -r -e /home /path/to/src

[anon45274024]

There is plenty to sift through, that will take moment.

Meantime ran a grep on the git for CCACHE_DIR but that did not produce a meaningful result

https://git.openwrt.org/?p=openwrt%2Fopenwrt.git&a=search&h=HEAD&st=grep&s=CCACHE_DIR

[anon45274024]

@anon45274024

Will try now with CCACHE_DIR , see if gets parsed || applied by the build script

That did not work, same error. Will have to look into

@jeff

Might have to set it in the environment explicitly, or in the ccache config file.

[anon45274024]

@vgaetera

grep -r -e /home /path/to/src

Nothing in the output that hints @ /home/${user}

---

according to man ccache -p would

Print current configuration options and from where they originate (environment variable, configuration file or compile-time default) in human-readable format.

But works only when invoked as ccache but that does not work since it does not get build that way but only as linked in compiler...

[anon45274024]

If would not have been for an error in the script it would have worked from the start, meaning /home/${user} is not required to be in residence.