Kill shell script wrappers

nixos has trouble with the shell script wrappers - readlink isn't
available by default!

But, there's a better approach: just get rid of them and use symlinks
instead, and have main() check what we're supposed to be.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Makefile

@@ -1,6 +1,7 @@
 PREFIX?=/usr/local
 PKG_CONFIG?=pkg-config
 INSTALL=install
+LN=ln
 
 ifeq ("$(origin V)", "command line")
   BUILD_VERBOSE = $(V)
@@ -152,15 +153,15 @@ install: INITRAMFS_HOOK=$(INITRAMFS_DIR)/hooks/bcachefs
 install: INITRAMFS_SCRIPT=$(INITRAMFS_DIR)/scripts/local-premount/bcachefs
 install: bcachefs
 	$(INSTALL) -m0755 -D bcachefs      -t $(DESTDIR)$(ROOT_SBINDIR)
-	$(INSTALL) -m0755    fsck.bcachefs    $(DESTDIR)$(ROOT_SBINDIR)
-	$(INSTALL) -m0755    mkfs.bcachefs    $(DESTDIR)$(ROOT_SBINDIR)
-	$(INSTALL) -m0755    mount.bcachefs   $(DESTDIR)$(ROOT_SBINDIR)
-	$(INSTALL) -m0755    fsck.bcachefs    $(DESTDIR)$(ROOT_SBINDIR)/fsck.fuse.bcachefs
-	$(INSTALL) -m0755    mkfs.bcachefs    $(DESTDIR)$(ROOT_SBINDIR)/mkfs.fuse.bcachefs
-	$(INSTALL) -m0755    mount.fuse.bcachefs	$(DESTDIR)$(ROOT_SBINDIR)
 	$(INSTALL) -m0644 -D bcachefs.8    -t $(DESTDIR)$(PREFIX)/share/man/man8/
 	$(INSTALL) -m0755 -D initramfs/script $(DESTDIR)$(INITRAMFS_SCRIPT)
 	$(INSTALL) -m0755 -D initramfs/hook   $(DESTDIR)$(INITRAMFS_HOOK)
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/mkfs.bcachefs
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/fsck.bcachefs
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/mount.bcachefs
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/mkfs.fuse.bcachefs
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/fsck.fuse.bcachefs
+	$(LN) -sr $(DESTDIR)$(ROOT_SBINDIR)/bcachefs $(DESTDIR)$(ROOT_SBINDIR)/mount.fuse.bcachefs
 
 	sed -i '/^# Note: make install replaces/,$$d' $(DESTDIR)$(INITRAMFS_HOOK)
 	echo "copy_exec $(ROOT_SBINDIR)/bcachefs /sbin/bcachefs" >> $(DESTDIR)$(INITRAMFS_HOOK)

bcachefs.c

@@ -188,6 +188,24 @@ int main(int argc, char *argv[])
 
 	full_cmd = argv[0];
 
+	/* Are we being called via a symlink? */
+
+	if (strstr(full_cmd, "mkfs"))
+		return cmd_format(argc, argv);
+
+	if (strstr(full_cmd, "fsck"))
+		return cmd_fsck(argc, argv);
+
+#ifdef BCACHEFS_FUSE
+	if (strstr(full_cmd, "mount.fuse"))
+		return cmd_fusemount(argc, argv);
+#endif
+
+#ifndef BCACHEFS_NO_RUST
+	if (strstr(full_cmd, "mount"))
+		return cmd_mount(argc, argv);
+#endif
+
 	setvbuf(stdout, NULL, _IOLBF, 0);
 
 	char *cmd = pop_cmd(&argc, argv);
@@ -253,9 +271,8 @@ int main(int argc, char *argv[])
 	if (!strcmp(cmd, "setattr"))
 		return cmd_setattr(argc, argv);
 #ifndef BCACHEFS_NO_RUST
-	if (!strcmp(cmd, "mount")) {
+	if (!strcmp(cmd, "mount"))
 		return cmd_mount(argc, argv);
-	}
 #endif
 
 #ifdef BCACHEFS_FUSE

fsck.bcachefs

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-SDIR="$(readlink -f "$0")"
-exec "${SDIR%/*}/bcachefs" fsck "$@"

mkfs.bcachefs

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-SDIR="$(readlink -f "$0")"
-exec "${SDIR%/*}/bcachefs" format "$@"

mount.bcachefs

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-SDIR="$(readlink -f "$0")"
-exec "${SDIR%/*}/bcachefs" mount "$@"

mount.fuse.bcachefs

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-exec bcachefs fusemount "$@"