Handle long symbolic links in apex
In many file systems, long symbolic link are stored outside of the inode
just like regular files. aosp/3382227 made a wrong assumption that all
symlinks in APEXes are short so that they are inlined in inode (aka fast
symlinks).
This CL fixes it. deapexer, when faced with a symlink, tries to read the
symlink by doing `stat` first to read the embedded target. If that
fails, it falls back to use `cat` for reading the target.
Bug: 390558705
Test: cd build/make/tools/releasetools/testdata
unzip foo.apex
debugfs -W -R "symlink long_symlink loooooooooooooooooooooooooooooooooooooooooooooooooong" apex_payload.img
debugfs -R "stat long_symlink" apex_payload.img
<shows EXTENTS: ... , not Fast link dest>
zip -u foo.apex apex_payload.img
deapexer extract foo.apex flatten
readsymlink flatten/long_symlink
<shows looooooooooooooooooooooooooooo....oooong>
Change-Id: I8d20067f99350d4b8ecd2fe7cc5ff87a08379b76
1 file changed
