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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2021-08-23 20:46:53 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska@appnovation.com> | 2021-08-23 20:46:53 +0000 |
| commit | 0bd454f68a63801e628dd9c4230a4b9e339cfe6e (patch) | |
| tree | 33aaf106c3b502821c8b610b273a20dae670a2e3 | |
| parent | 6696cee3bd309f61fc6c945ef747262a845e9267 (diff) | |
| download | s6-linux-init-0bd454f68a63801e628dd9c4230a4b9e339cfe6e.tar.xz | |
Support CONFIG_TTY=n where the kernel doesn't even open 0, 1, 2
Signed-off-by: Laurent Bercot <ska@appnovation.com>
| -rw-r--r-- | src/init/s6-linux-init.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/src/init/s6-linux-init.c b/src/init/s6-linux-init.c index 6bf22b8..bb24a52 100644 --- a/src/init/s6-linux-init.c +++ b/src/init/s6-linux-init.c @@ -126,6 +126,7 @@ int main (int argc, char const **argv, char const *const *envp) char const *envdumpdir = 0 ; char const *initdefault = "default" ; int mounttype = 1 ; + int hasconsole = 1 ; stralloc envmodifs = STRALLOC_ZERO ; PROG = "s6-linux-init" ; @@ -159,6 +160,7 @@ int main (int argc, char const **argv, char const *const *envp) argc -= l.ind ; argv += l.ind ; } + if (fcntl(1, F_GETFD) < 0) hasconsole = 0 ; if (inns) { /* If there's a Docker synchronization pipe, wait on it */ char c ; @@ -173,7 +175,7 @@ int main (int argc, char const **argv, char const *const *envp) close(3) ; } } - else allwrite(1, BANNER, sizeof(BANNER) - 1) ; + else if (hasconsole) allwrite(1, BANNER, sizeof(BANNER) - 1) ; if (chdir("/") == -1) strerr_diefu1sys(111, "chdir to /") ; umask(mask) ; setpgid(0, 0) ; @@ -187,9 +189,8 @@ int main (int argc, char const **argv, char const *const *envp) /* at this point we're totally in the dark, hoping /dev/console will work */ nope = mount("dev", slashdev, "devtmpfs", MS_NOSUID | MS_NOEXEC, "") < 0 ; e = errno ; - if (open("/dev/console", O_WRONLY) - || fd_move(2, 0) < 0 - || fd_copy(1, 2) < 0) return 111 ; + if (open("/dev/console", O_WRONLY) && open("/dev/null", O_WRONLY)) return 111 ; + if (fd_move(2, 0) < 0 || fd_copy(1, 2) < 0) return 111 ; if (nope) { errno = e ; @@ -206,6 +207,10 @@ int main (int argc, char const **argv, char const *const *envp) if (fd_move(0, p[0]) < 0) strerr_diefu1sys(111, "fd_move to stdin") ; } + if (!hasconsole) + if (open("/dev/null", O_WRONLY) != 1 || fd_copy(2, 1) == -1) + return 111 ; + if (mounttype) { if (mounttype == 2) |