Fixes format inconsistencies with docker for certain history fields

cmd/podman/images/history.go

@@ -3,9 +3,7 @@ package images
 import (
 	"fmt"
 	"os"
-	"strings"
 	"time"
-	"unicode"
 
 	"github.com/containers/common/pkg/report"
 	"github.com/containers/podman/v4/cmd/podman/common"
@@ -149,9 +147,7 @@ func (h historyReporter) Created() string {
 }
 
 func (h historyReporter) Size() string {
-	s := units.HumanSizeWithPrecision(float64(h.ImageHistoryLayer.Size), 3)
-	i := strings.LastIndexFunc(s, unicode.IsNumber)
-	return s[:i+1] + " " + s[i+1:]
+	return units.HumanSizeWithPrecision(float64(h.ImageHistoryLayer.Size), 3)
 }
 
 func (h historyReporter) CreatedBy() string {
@@ -169,7 +165,7 @@ func (h historyReporter) ID() string {
 }
 
 func (h historyReporter) CreatedAt() string {
-	return time.Unix(h.ImageHistoryLayer.Created.Unix(), 0).UTC().String()
+	return time.Unix(h.ImageHistoryLayer.Created.Unix(), 0).Format(time.RFC3339)
 }
 
 func (h historyReporter) CreatedSince() string {

test/e2e/history_test.go

@@ -44,6 +44,11 @@ var _ = Describe("Podman history", func() {
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 		Expect(session.OutputToStringArray()).ToNot(BeEmpty())
+
+		session = podmanTest.Podman([]string{"history", "--format", "{{.CreatedAt}};{{.Size}}", ALPINE})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+		Expect(session.OutputToString()).To(MatchRegexp("[0-9-]{10}T[0-9:]{8}[Z0-9+:-]+;[0-9.]+[MG]*B( .+)?"))
 	})
 
 	It("podman history with human flag", func() {

test/system/110-history.bats

@@ -57,15 +57,30 @@ size      | -\\\?[0-9]\\\+
 
 @test "podman image history Created" {
     # Values from image LIST
-    run_podman image list --format '{{.CreatedSince}}--{{.CreatedAt}}' $IMAGE
-    from_imagelist="$output"
-    assert "$from_imagelist" =~ "^[0-9].* ago--[0-9]+-[0-9]+-[0-9]+ [0-9:]+ " \
-           "CreatedSince and CreatedAt look reasonable"
-
-    # Values from image HISTORY
-    run_podman image history --format '{{.CreatedSince}}--{{.CreatedAt}}' $IMAGE
-    assert "${lines[0]}" == "$from_imagelist" \
-           "CreatedSince and CreatedAt from image history should == image list"
+    run_podman image list --format '{{.CreatedSince}}\n{{.CreatedAt}}' $IMAGE
+    imagelist_since="${lines[0]}"
+    imagelist_at="${lines[1]}"
+
+    assert "${imagelist_since}" =~ "^[0-9]+.* ago" \
+           "image list: CreatedSince looks reasonable"
+    assert "${imagelist_at}" =~ "^[0-9]+-[0-9]+-[0-9]+ [0-9:]+ \+0000 UTC\$" \
+           "image list: CreatedAt looks reasonable"
+
+    # Values from image HISTORY. For docker compatibility, this command now
+    # honors $TZ (#18213) for CreatedAt.
+    TZ=UTC run_podman image history --format '{{.CreatedSince}}\n{{.CreatedAt}}' $IMAGE
+    imagehistory_since="${lines[0]}"
+    imagehistory_at="${lines[1]}"
+
+    assert "$imagehistory_since" == "$imagelist_since" \
+           "CreatedSince from image history should == image list"
+
+    # More docker compatibility: both commands emit ISO8601-ish dates but
+    # with different separators so we need to compare date & time separately.
+    assert "${imagehistory_at:0:10}" == "${imagelist_at:0:10}" \
+           "CreatedAt (date) from image history should == image list"
+    assert "${imagehistory_at:11:8}" == "${imagelist_at:11:8}" \
+           "CreatedAt (time) from image history should == image list"
 }
 
 # vim: filetype=sh