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authorpixdamix@gmail.com <pixdamix@gmail.com@e8e0d7a0-c8d9-11dd-a880-a1081c7ac358>2012-11-22 07:24:42 (EST)
committer pixdamix@gmail.com <pixdamix@gmail.com@e8e0d7a0-c8d9-11dd-a880-a1081c7ac358>2012-11-22 07:24:42 (EST)
commit6b576f0d9b00f78a60f4994b663fd8ce43b9f6da (patch)
tree675af5651717547cdd513f4270a0229d701e0e4c /CONTRIBUTORS
parent5077685e6433d5609b9b82100e4dd18910d6affd (diff)
update-alternatives: use 'ln -n'
Using the '-n' option (--no-dereference) is a better way to solve the do-not-link-into-directory issue. Using only 'ln -sf' can cause problems on SELinux enabled hosts when target is inaccessible; e.g. when preparing an offline rootsystem: | $ cd <offline root> | $ ln -sf /lib/systemd/systemd sbin/init # alternative #1 | $ ln -sf /bin/busybox sbin/init # alternative #2 | ln: accessing `sbin/init': Permission denied | | --> strace: | brk(0) = 0x102b000 | stat("sbin/init", 0x7fffaa91c900) = -1 EACCES (Permission denied) | ... | exit_group(1) = ? Now with '-n': | $ ln -snf /bin/busybox sbin/init | lstat("sbin/init", {st_mode=S_IFLNK|0777, st_size=20, ...}) = 0 | lstat("sbin/init", {st_mode=S_IFLNK|0777, st_size=20, ...}) = 0 | stat("/bin/busybox", 0x7fff8c1a3bd0) = -1 ENOENT (No such file or directory) | symlink("/bin/busybox", "sbin/init") = -1 EEXIST (File exists) | unlink("sbin/init") = 0 | symlink("/bin/busybox", "sbin/init") = 0 The '-n' flag is well supported (coreutils have it at least since 1999, busybox at least since 0.60.3 (2002)) and it obsoletes the explicit check whether target is a directory. Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de> git-svn-id: http://opkg.googlecode.com/svn/trunk@649 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358
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