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[7.3.0] Document source of truth for rctx.download* cache key #23048

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Jul 22, 2024
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[7.3.0] Document source of truth for rctx.download* cache key #23048

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21 changes: 16 additions & 5 deletions .../com/google/devtools/build/lib/bazel/repository/starlark/StarlarkBaseExternalContext.java
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Original file line number Diff line number Diff line change
Expand Up @@ -632,7 +632,10 @@ private StructImpl completeDownload(PendingDownload pendingDownload)
+ " This must match the SHA-256 hash of the file downloaded. It is a security"
+ " risk to omit the SHA-256 as remote files can change. At best omitting this"
+ " field will make your build non-hermetic. It is optional to make development"
+ " easier but should be set before shipping."),
+ " easier but should be set before shipping."
+ " If provided, the repository cache will first be checked for a file with the"
+ " given hash; a download will only be attempted if the file was not found in"
+ " the cache. After a successful download, the file will be added to the cache."),
@Param(
name = "executable",
defaultValue = "False",
Expand All @@ -651,7 +654,8 @@ private StructImpl completeDownload(PendingDownload pendingDownload)
named = true,
doc =
"If set, restrict cache hits to those cases where the file was added to the cache"
+ " with the same canonical id"),
+ " with the same canonical id. By default caching uses the checksum"
+ "(<code>sha256</code> or <code>integrity</code>)."),
@Param(
name = "auth",
defaultValue = "{}",
Expand All @@ -672,7 +676,10 @@ private StructImpl completeDownload(PendingDownload pendingDownload)
+ " This must match the checksum of the file downloaded. It is a security"
+ " risk to omit the checksum as remote files can change. At best omitting this"
+ " field will make your build non-hermetic. It is optional to make development"
+ " easier but should be set before shipping."),
+ " easier but should be set before shipping."
+ " If provided, the repository cache will first be checked for a file with the"
+ " given checksum; a download will only be attempted if the file was not found in"
+ " the cache. After a successful download, the file will be added to the cache."),
@Param(
name = "block",
defaultValue = "True",
Expand Down Expand Up @@ -852,7 +859,8 @@ public Object download(
named = true,
doc =
"If set, restrict cache hits to those cases where the file was added to the cache"
+ " with the same canonical id"),
+ " with the same canonical id. By default caching uses the checksum"
+ "(<code>sha256</code> or <code>integrity</code>)."),
@Param(
name = "auth",
defaultValue = "{}",
Expand All @@ -873,7 +881,10 @@ public Object download(
+ " This must match the checksum of the file downloaded. It is a security"
+ " risk to omit the checksum as remote files can change. At best omitting this"
+ " field will make your build non-hermetic. It is optional to make development"
+ " easier but should be set before shipping."),
+ " easier but should be set before shipping."
+ " If provided, the repository cache will first be checked for a file with the"
+ " given checksum; a download will only be attempted if the file was not found in"
+ " the cache. After a successful download, the file will be added to the cache."),
@Param(
name = "rename_files",
defaultValue = "{}",
Expand Down
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