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authorValentin Rothberg <rothberg@redhat.com>2020-12-08 14:24:34 +0100
committerValentin Rothberg <rothberg@redhat.com>2020-12-09 11:24:32 +0100
commit8472efdbd1efcb4eea9872baf56e2473a0dd970f (patch)
tree9898e72b72ba2ec6c102a2ae8e41f8a0ae9abe4e /pkg/copy
parentdd295f297b6dd51d22c64c75f4ef4f80f953bbde (diff)
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pkg/copy: add parsing API
Add an API for parsing user input into a possibly specified container and path. This allows for sharing the parsing code between the local and the remote client (and bindings) in the future. Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Diffstat (limited to 'pkg/copy')
-rw-r--r--pkg/copy/parse.go61
1 files changed, 61 insertions, 0 deletions
diff --git a/pkg/copy/parse.go b/pkg/copy/parse.go
new file mode 100644
index 000000000..39e0e1547
--- /dev/null
+++ b/pkg/copy/parse.go
@@ -0,0 +1,61 @@
+package copy
+
+import (
+ "strings"
+
+ "github.com/pkg/errors"
+)
+
+// ParseSourceAndDestination parses the source and destination input into a
+// possibly specified container and path. The input format is described in
+// podman-cp(1) as "[nameOrID:]path". Colons in paths are supported as long
+// they start with a dot or slash.
+//
+// It returns, in order, the source container and path, followed by the
+// destination container and path, and an error. Note that exactly one
+// container must be specified.
+func ParseSourceAndDestination(source, destination string) (string, string, string, string, error) {
+ sourceContainer, sourcePath := parseUserInput(source)
+ destContainer, destPath := parseUserInput(destination)
+
+ numContainers := 0
+ if len(sourceContainer) > 0 {
+ numContainers++
+ }
+ if len(destContainer) > 0 {
+ numContainers++
+ }
+
+ if numContainers != 1 {
+ return "", "", "", "", errors.Errorf("invalid arguments %q, %q: exactly 1 container expected but %d specified", source, destination, numContainers)
+ }
+
+ if len(sourcePath) == 0 || len(destPath) == 0 {
+ return "", "", "", "", errors.Errorf("invalid arguments %q, %q: you must specify paths", source, destination)
+ }
+
+ return sourceContainer, sourcePath, destContainer, destPath, nil
+}
+
+// parseUserInput parses the input string and returns, if specified, the name
+// or ID of the container and the path. The input format is described in
+// podman-cp(1) as "[nameOrID:]path". Colons in paths are supported as long
+// they start with a dot or slash.
+func parseUserInput(input string) (container string, path string) {
+ if len(input) == 0 {
+ return
+ }
+ path = input
+
+ // If the input starts with a dot or slash, it cannot refer to a
+ // container.
+ if input[0] == '.' || input[0] == '/' {
+ return
+ }
+
+ if spl := strings.SplitN(path, ":", 2); len(spl) == 2 {
+ container = spl[0]
+ path = spl[1]
+ }
+ return
+}