tree 4f45c1f778df30bc0b90dae71ed50f9456531e30
parent 8ef291545330f18177d797a3e0ecdc5508a5eefd
author Greg Spencer <gspencergoog@users.noreply.github.com> 1590618646 -0700
committer GitHub <noreply@github.com> 1590618646 -0700
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Update the flutter script's locking mechanism and follow_links (#57590)

Update the flutter and dart scripts' locking mechanism and follow_links function to be more robust and support more platforms.

This adds support for using mkdir as a fallback if the system doesn't have flock instead of using shlock, since shlock doesn't work on shared filesystems.

It also fixes a problem in the follow_links function where it failed when the link resolved to the root directory.