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lib/deploy: Add safety margin in early prune space check

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There are a few things the estimator doesn't account for, e.g. writing
the new BLS entries. Rather than trying to perfect it (since I think we
should change approach entirely -- see previous commit message), just
add a 1M margin to the space check.
This commit is contained in:
Jonathan Lebon 2024-01-04 11:14:40 -05:00
parent 4982306e67
commit cc5747a605
1 changed files with 9 additions and 0 deletions
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9
src/libostree/ostree-sysroot-deploy.c
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@ -59,6 +59,12 @@
SD_ID128_MAKE (e8, 64, 6c, d6, 3d, ff, 46, 25, b7, 79, 09, a8, e7, a4, 09, 94)
#endif
/* How much additional space we require available on top of what we accounted
* during the early prune fallocate space check. This accounts for anything not
* captured directly by `get_kernel_layout_size()` like writing new BLS entries.
*/
#define EARLY_PRUNE_SAFETY_MARGIN_SIZE (1 << 20) /* 1 MB */
/*
* Like symlinkat() but overwrites (atomically) an existing
* symlink.
@ -2541,6 +2547,9 @@ dfd_fallocate_check (int dfd, off_t len, gboolean *out_passed, GError **error)
if (!glnx_open_tmpfile_linkable_at (dfd, ".", O_WRONLY | O_CLOEXEC, &tmpf, error))
return FALSE;
/* add the safety margin */
len += EARLY_PRUNE_SAFETY_MARGIN_SIZE;
*out_passed = TRUE;
/* There's glnx_try_fallocate, but not with the same error semantics. */
if (TEMP_FAILURE_RETRY (fallocate (tmpf.fd, 0, 0, len)) < 0)