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mozilla / sccache

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utilize caching in remote storage environments, including various cloud storage options, or alternatively, in local storage.
Apache License 2.0
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compiler wrapper trying to create temporary files in /dev #2288

Open mischief opened 2 days ago

mischief commented 2 days ago

hi,

without any additional setup or ceremony, i built HEAD with rustc/cargo 1.81.0 in gentoo and invoked sccache like the readme suggests: https://github.com/mozilla/sccache?tab=readme-ov-file#usage

mischief@beast:~/src/sccache $ cargo build --release
   Compiling libc v0.2.155
   Compiling proc-macro2 v1.0.75
   Compiling unicode-ident v1.0.12
...
    Finished `release` profile [optimized] target(s) in 3m 24s

i'm not a rust person, but i find it odd that sccache would attempt to make a temporary file in /dev/. a user program should never do this.

this occurred after more than 1 invocation of sccache with the same parameters. the first invocation had no error.

mischief@beast:~/src/sccache $ ./target/release/sccache cc -o /dev/null -c ~/code/c/fbufsize.c
sccache: encountered fatal error
sccache: error: Permission denied (os error 13) at path "/dev/.tmp48KCJX"
sccache: caused by: Permission denied (os error 13) at path "/dev/.tmp48KCJX"

fbufsize.c is nothing special, just a trivial program i had laying around.

#include <stdio.h>
#include <stdio_ext.h>

int main(void)
{
        setvbuf(stdout, NULL, _IONBF, 0);
        setvbuf(stderr, NULL, _IONBF, 0);
        printf("%ld\n", __fbufsize(stdout));
        printf("%ld\n", __fbufsize(stderr));
        return 0;
}
Xuanwo commented 2 days ago

./target/release/sccache cc -o /dev/null -c ~/code/c/fbufsize.c

Hi, what will happen if we change -o /dev/null?