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run/load/tftp: detect bad directory

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If a user has e.g. /tftpboot/x86 as directory and configures
base_dir=/tftboot and offset_dir=/x86, this leads to bad behavior
as the load module creates a symlink

/tftpboot/x86/<builddir> -> <absolut_builddir>

in this case instead of the desired

/tftpboot/x86 -> <absolut_builddir>

Furthermore, the module works on

/tftpboot/x86/config-00-00-00-00-00-00

and

/tftpboot/x86/<builddir>/config-00-00-00-00-00-00

afterwards, which looks bad too. As there is no warning at all, this can
be hard to debug. The commit adds an appropriate check with error message and
exit -1 on an existing directory.

Fixes #1630
This commit is contained in:
Martin Stein 2015-07-10 18:54:22 +02:00 committed by Norman Feske
parent 4cf319a9d7
commit b60f28bee9
1 changed files with 8 additions and 0 deletions
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8
tool/run/load/tftp
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@ -47,6 +47,14 @@ proc generate_tftp_config { } {
set tftp_offset_dir [load_tftp_offset_dir]
if {[string length $tftp_base_dir] > 0 && [string length $tftp_offset_dir] > 0} {
# if the link target exists as directory this leads to bad behavior
if {[file exists $tftp_base_dir$tftp_offset_dir] &&
[string compare [file type $tftp_base_dir$tftp_offset_dir] "directory"] == 0} {
puts stderr "Error: TFTP symlink target $tftp_base_dir$tftp_offset_dir is a directory"
exit -1
}
exec ln -nfs "[pwd]" "$tftp_base_dir$tftp_offset_dir"
set tftp_base ""