fix(ci): extract QEMU interceptor to dedicated C file to fix YAML indentation

2026-09-14 00:15:20 +02:00
parent 23bc802dae
commit b53d31d8cf
3 changed files with 111 additions and 180 deletions
@@ -0,0 +1,91 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <spawn.h>
+
+static int is_x86_64_elf(const char *path) {
+    if (!path) return 0;
+    int fd = open(path, O_RDONLY);
+    if (fd < 0) return 0;
+    unsigned char header[20];
+    ssize_t n = read(fd, header, sizeof(header));
+    close(fd);
+    if (n < 20) return 0;
+    if (header[0] != 0x7f || header[1] != 'E' || header[2] != 'L' || header[3] != 'F') return 0;
+    if (header[4] != 2 || header[5] != 1) return 0;
+    uint16_t machine = (uint16_t)(header[18] | (header[19] << 8));
+    return machine == 62;
+}
+
+static char **build_qemu_argv(const char *pathname, char *const argv[]) {
+    int argc = 0;
+    while (argv && argv[argc]) argc++;
+    char **new_argv = (char **)malloc((argc + 4) * sizeof(char *));
+    if (!new_argv) return NULL;
+    new_argv[0] =  /usr/bin/qemu-x86_64-static;
+    new_argv[1] = -L;
+    new_argv[2] = /usr/x86_64-linux-gnu;
+    new_argv[3] = (char *)pathname;
+    for (int i = 1; i < argc; i++) {
+        new_argv[i + 3] = argv[i];
+    }
+    new_argv[argc + 3] = NULL;
+    return new_argv;
+}
+
+int execve(const char *pathname, char *const argv[], char *const envp[]) {
+    static int (*real_execve)(const char *, char *const [], char *const []) = NULL;
+    if (!real_execve) real_execve = (int (*)(const char *, char *const [], char *const []))dlsym(RTLD_NEXT, execve);
+    if (pathname && is_x86_64_elf(pathname)) {
+        char **new_argv = build_qemu_argv(pathname, argv);
+        if (new_argv) {
+            return real_execve(/usr/bin/qemu-x86_64-static, new_argv, envp);
+        }
+    }
+    return real_execve(pathname, argv, envp);
+}
+
+int execv(const char *pathname, char *const argv[]) {
+    extern char **environ;
+    return execve(pathname, argv, environ);
+}
+
+int execvp(const char *file, char *const argv[]) {
+    extern char **environ;
+    return execve(file, argv, environ);
+}
+
+int execvpe(const char *file, char *const argv[], char *const envp[]) {
+    return execve(file, argv, envp);
+}
+
+int posix_spawn(pid_t *pid, const char *path,
+                const posix_spawn_file_actions_t *file_actions,
+                const posix_spawnattr_t *attrp,
+                char *const argv[], char *const envp[]) {
+    static int (*real_posix_spawn)(pid_t *, const char *, const posix_spawn_file_actions_t *,
+                                  const posix_spawnattr_t *, char *const [], char *const []) = NULL;
+    if (!real_posix_spawn) {
+        real_posix_spawn = (int (*)(pid_t *, const char *, const posix_spawn_file_actions_t *,
+                                   const posix_spawnattr_t *, char *const [], char *const []))dlsym(RTLD_NEXT, posix_spawn);
+    }
+    if (path && is_x86_64_elf(path)) {
+        char **new_argv = build_qemu_argv(path, argv);
+        if (new_argv) {
+            return real_posix_spawn(pid, /usr/bin/qemu-x86_64-static, file_actions, attrp, new_argv, envp);
+        }
+    }
+    return real_posix_spawn(pid, path, file_actions, attrp, argv, envp);
+}
+
+int posix_spawnp(pid_t *pid, const char *file,
+                 const posix_spawn_file_actions_t *file_actions,
+                 const posix_spawnattr_t *attrp,
+                 char *const argv[], char *const envp[]) {
+    return posix_spawn(pid, file, file_actions, attrp, argv, envp);
+}