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delta: Add --if-not-exists option

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I often want to have "idempotent" systems that iterate to a known
state.  If after generating a commit, the system is interrupted, I'd
like the next run to still generate a delta.  But we don't want to
regenerate if one exists, hence this option.

Closes: #375
Approved by: jlebon
This commit is contained in:
Colin Walters authored and Atomic Bot committed 2016-07-04 13:27:06 +00:00
1 parent 8933c93a55
commit 0d07c7ecde
6 files changed
+66 -1
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tests/test-delta.sh
+8 -1
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@@ -82,6 +82,8 @@ get_assert_one_direntry_matching() {
origrev=$(${CMD_PREFIX} ostree --repo=repo rev-parse test)
${CMD_PREFIX} ostree --repo=repo static-delta generate --empty --to=${origrev}
${CMD_PREFIX} ostree --repo=repo static-delta generate --if-not-exists --empty --to=${origrev} > out.txt
assert_file_has_content out.txt "${origrev} already exists"
${CMD_PREFIX} ostree --repo=repo static-delta list | grep ${origrev} || exit 1
${CMD_PREFIX} ostree --repo=repo prune
${CMD_PREFIX} ostree --repo=repo static-delta list | grep ${origrev} || exit 1
@@ -91,7 +93,12 @@ ${CMD_PREFIX} ostree --repo=repo commit -b test -s test --tree=dir=files
newrev=$(${CMD_PREFIX} ostree --repo=repo rev-parse test)
${CMD_PREFIX} ostree --repo=repo static-delta generate --from=${origrev} --to=${newrev} --inline
${CMD_PREFIX} ostree --repo=repo static-delta generate --if-not-exists --from=${origrev} --to=${newrev} --inline
${CMD_PREFIX} ostree --repo=repo static-delta generate --if-not-exists --from=${origrev} --to=${newrev} --inline > out.txt
assert_file_has_content out.txt "${origrev}-${newrev} already exists"
# Should regenerate
${CMD_PREFIX} ostree --repo=repo static-delta generate --from=${origrev} --to=${newrev} --inline > out.txt
assert_not_file_has_content out.txt "${origrev}-${newrev} already exists"
deltaprefix=$(get_assert_one_direntry_matching repo/deltas '.')
deltadir=$(get_assert_one_direntry_matching repo/deltas/${deltaprefix} '-')