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use C shim to start Android app

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This should avoid relying on features of the Android builtin shell,
and so hopefully avoid failures like this one
http://git-annex.branchable.com/design/assistant/blog/day_197__template_haskell/#comment-07f90830f78f6495dcbdf90eb8636129

The C shim sets up busybox, and uses its builtin shell to run runshell.

It's important that busybox be configured with
CONFIG_FEATURE_SH_STANDALONE, so that while runshell is running, it
does not rely on either system utilities, or busybox being already
installed.
This commit is contained in:
Joey Hess 2013-02-24 13:25:55 -04:00
parent 920138d5fb
commit ac0292df95
6 changed files with 64 additions and 12 deletions
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52
standalone/android/start.c Normal file
View file

@ -0,0 +1,52 @@
/* Installed as lib.start.so, this bootstraps a working busybox and uses
* it to run lib.runshell.so. */
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
void chopdir (char *s) {
char *p=strrchr(s, '/');
if (p == NULL) {
fprintf(stderr, "cannot find directory in %s", s);
exit(1);
}
p[0] = '\0';
}
main () {
char buf[1024];
char *p;
struct stat st_buf;
/* Get something like /data/data/ga.androidterm/lib/lib.start.so */
int n=readlink("/proc/self/exe", buf, 1023);
if (n < 1) {
fprintf(stderr, "failed to find own name");
exit(1);
}
buf[n] = '\0';
/* Change directory to something like /data/data/ga.androidterm */
chopdir(buf);
chopdir(buf);
if (chdir(buf) != 0) {
perror("chdir");
exit(1);
}
/* If this is the first run, set up busybox link. */
if (stat("bin/busybox", &st_buf) != 0) {
mkdir("bin", 0777);
if (link("lib/lib.busybox.so", "bin/busybox") != 0) {
perror("link busybox");
exit(1);
}
}
execl("bin/busybox", "bin/busybox", "sh", "lib/lib.runshell.so", NULL);
perror("error running busybox sh");
}