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authorSören Tempel <soeren@soeren-tempel.net>2023-09-17 17:21:49 +0200
committerLudovic Courtès <ludo@gnu.org>2023-10-23 11:56:54 +0200
commit54e6788267c0dac43ec9cb234c711eaa73a3d92b (patch)
treebd6590094eee3708b057b8e4a5ae6ff53564f380 /guix/build/syscalls.scm
parent48c1a74b2461d42dc0df202d8353640b3b64ac62 (diff)
syscalls: Add support for musl libc.
This commit allows using Guix on a foreign distro which uses musl libc, for example, Alpine Linux. Usage of musl libc is detected via a new musl-libc? variable using the Guile %host-type. Using the new musl-libc? variable, we can now implement musl-specific quirks. The two compatibility problems I encountered in this regard are that musl dose not export a readdir64 and statfs64 symbol. On musl, these two functions are implemented as CPP macros that expand to readdir/statfs. To workaround that, a case-distinction was added. The existing linux? variable has been modified to return true if the %host-system contains "linux-" in order to ensure it is true for both linux-gnu as well as linux-musl host systems. The patch has been tested on Alpine Linux and is already used for the downstream Guix package shipped in Alpine Linux's package repository. * guix/build/syscalls.scm (musl-libc?): New variable. (linux?): Truth value on any linux system. (statfs, readdir-procedure): Support musl libc. Signed-off-by: Sören Tempel <soeren@soeren-tempel.net> Signed-off-by: Ludovic Courtès <ludo@gnu.org> Change-Id: Icc4101a062381240f977f4550344bde696513c52
Diffstat (limited to 'guix/build/syscalls.scm')
-rw-r--r--guix/build/syscalls.scm7
1 files changed, 4 insertions, 3 deletions
diff --git a/guix/build/syscalls.scm b/guix/build/syscalls.scm
index d947b010d3..e02ed07cd4 100644
--- a/guix/build/syscalls.scm
+++ b/guix/build/syscalls.scm
@@ -836,7 +836,8 @@ fdatasync(2) on the underlying file descriptor."
(define-syntax fsword ;fsword_t
(identifier-syntax long))
-(define linux? (string-contains %host-type "linux-gnu"))
+(define musl-libc? (string-contains %host-type "linux-musl"))
+(define linux? (string-contains %host-type "linux-"))
(define-syntax define-statfs-flags
(syntax-rules (linux hurd)
@@ -905,7 +906,7 @@ fdatasync(2) on the underlying file descriptor."
(spare (array fsword 4)))
(define statfs
- (let ((proc (syscall->procedure int "statfs64" '(* *))))
+ (let ((proc (syscall->procedure int (if musl-libc? "statfs" "statfs64") '(* *))))
(lambda (file)
"Return a <file-system> data structure describing the file system
mounted at FILE."
@@ -1232,7 +1233,7 @@ system to PUT-OLD."
(define (readdir-procedure name-field-offset sizeof-dirent-header
read-dirent-header)
- (let ((proc (syscall->procedure '* "readdir64" '(*))))
+ (let ((proc (syscall->procedure '* (if musl-libc? "readdir" "readdir64") '(*))))
(lambda* (directory #:optional (pointer->string pointer->string/utf-8))
(let ((ptr (proc directory)))
(and (not (null-pointer? ptr))